[  655.019751][   T10] unregister_netdevice: waiting for ns1eth4 to become free. Usage count = 4
[  655.020115][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  655.020115][   T10]      netdev_get_by_index+0x5e/0x80
[  655.020115][   T10]      fib6_nh_init+0x3d8/0x15b0
[  655.020115][   T10]      ip6_route_info_create+0xf18/0x17d0
[  655.020115][   T10]      addrconf_f6i_alloc+0x244/0x410
[  655.020115][   T10]      ipv6_add_addr+0x411/0x2000
[  655.020115][   T10]      inet6_addr_add+0x30e/0xa40
[  655.020115][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  655.020115][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.020115][   T10]      netlink_rcv_skb+0x130/0x360
[  655.020115][   T10]      netlink_unicast+0x449/0x710
[  655.020115][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.020115][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.020115][   T10]      ___sys_sendmsg+0xee/0x170
[  655.020115][   T10]      __sys_sendmsg+0xcd/0x170
[  655.020115][   T10]      do_syscall_64+0xc6/0x1e0
[  655.020115][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.020115][   T10] 
[  655.022367][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  655.022367][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  655.022367][   T10]      ipv6_find_idev+0x102/0x170
[  655.022367][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  655.022367][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.022367][   T10]      netlink_rcv_skb+0x130/0x360
[  655.022367][   T10]      netlink_unicast+0x449/0x710
[  655.022367][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.022367][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.022367][   T10]      ___sys_sendmsg+0xee/0x170
[  655.022367][   T10]      __sys_sendmsg+0xcd/0x170
[  655.022367][   T10]      do_syscall_64+0xc6/0x1e0
[  655.022367][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.022367][   T10] 
[  655.024088][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  655.024088][   T10]      neigh_parms_alloc+0x1e5/0x510
[  655.024088][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  655.024088][   T10]      ipv6_find_idev+0x102/0x170
[  655.024088][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  655.024088][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.024088][   T10]      netlink_rcv_skb+0x130/0x360
[  655.024088][   T10]      netlink_unicast+0x449/0x710
[  655.024088][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.024088][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.024088][   T10]      ___sys_sendmsg+0xee/0x170
[  655.024088][   T10]      __sys_sendmsg+0xcd/0x170
[  655.024088][   T10]      do_syscall_64+0xc6/0x1e0
[  655.024088][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.024088][   T10] 
[  655.025955][   T10] unregister_netdevice: waiting for ns2eth4 to become free. Usage count = 4
[  655.026241][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  655.026241][   T10]      netdev_get_by_index+0x5e/0x80
[  655.026241][   T10]      fib6_nh_init+0x3d8/0x15b0
[  655.026241][   T10]      ip6_route_info_create+0xf18/0x17d0
[  655.026241][   T10]      addrconf_f6i_alloc+0x244/0x410
[  655.026241][   T10]      ipv6_add_addr+0x411/0x2000
[  655.026241][   T10]      inet6_addr_add+0x30e/0xa40
[  655.026241][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  655.026241][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.026241][   T10]      netlink_rcv_skb+0x130/0x360
[  655.026241][   T10]      netlink_unicast+0x449/0x710
[  655.026241][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.026241][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.026241][   T10]      ___sys_sendmsg+0xee/0x170
[  655.026241][   T10]      __sys_sendmsg+0xcd/0x170
[  655.026241][   T10]      do_syscall_64+0xc6/0x1e0
[  655.026241][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.026241][   T10] 
[  655.028453][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  655.028453][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  655.028453][   T10]      ipv6_find_idev+0x102/0x170
[  655.028453][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  655.028453][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.028453][   T10]      netlink_rcv_skb+0x130/0x360
[  655.028453][   T10]      netlink_unicast+0x449/0x710
[  655.028453][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.028453][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.028453][   T10]      ___sys_sendmsg+0xee/0x170
[  655.028453][   T10]      __sys_sendmsg+0xcd/0x170
[  655.028453][   T10]      do_syscall_64+0xc6/0x1e0
[  655.028453][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.028453][   T10] 
[  655.030145][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  655.030145][   T10]      neigh_parms_alloc+0x1e5/0x510
[  655.030145][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  655.030145][   T10]      ipv6_find_idev+0x102/0x170
[  655.030145][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  655.030145][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.030145][   T10]      netlink_rcv_skb+0x130/0x360
[  655.030145][   T10]      netlink_unicast+0x449/0x710
[  655.030145][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.030145][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.030145][   T10]      ___sys_sendmsg+0xee/0x170
[  655.030145][   T10]      __sys_sendmsg+0xcd/0x170
[  655.030145][   T10]      do_syscall_64+0xc6/0x1e0
[  655.030145][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.030145][   T10] 
[  655.031989][   T10] unregister_netdevice: waiting for ns1eth3 to become free. Usage count = 4
[  655.032276][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  655.032276][   T10]      netdev_get_by_index+0x5e/0x80
[  655.032276][   T10]      fib6_nh_init+0x3d8/0x15b0
[  655.032276][   T10]      ip6_route_info_create+0xf18/0x17d0
[  655.032276][   T10]      addrconf_f6i_alloc+0x244/0x410
[  655.032276][   T10]      ipv6_add_addr+0x411/0x2000
[  655.032276][   T10]      inet6_addr_add+0x30e/0xa40
[  655.032276][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  655.032276][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.032276][   T10]      netlink_rcv_skb+0x130/0x360
[  655.032276][   T10]      netlink_unicast+0x449/0x710
[  655.032276][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.032276][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.032276][   T10]      ___sys_sendmsg+0xee/0x170
[  655.032276][   T10]      __sys_sendmsg+0xcd/0x170
[  655.032276][   T10]      do_syscall_64+0xc6/0x1e0
[  655.032276][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.032276][   T10] 
[  655.034542][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  655.034542][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  655.034542][   T10]      ipv6_find_idev+0x102/0x170
[  655.034542][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  655.034542][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.034542][   T10]      netlink_rcv_skb+0x130/0x360
[  655.034542][   T10]      netlink_unicast+0x449/0x710
[  655.034542][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.034542][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.034542][   T10]      ___sys_sendmsg+0xee/0x170
[  655.034542][   T10]      __sys_sendmsg+0xcd/0x170
[  655.034542][   T10]      do_syscall_64+0xc6/0x1e0
[  655.034542][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.034542][   T10] 
[  655.036281][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  655.036281][   T10]      neigh_parms_alloc+0x1e5/0x510
[  655.036281][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  655.036281][   T10]      ipv6_find_idev+0x102/0x170
[  655.036281][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  655.036281][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.036281][   T10]      netlink_rcv_skb+0x130/0x360
[  655.036281][   T10]      netlink_unicast+0x449/0x710
[  655.036281][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.036281][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.036281][   T10]      ___sys_sendmsg+0xee/0x170
[  655.036281][   T10]      __sys_sendmsg+0xcd/0x170
[  655.036281][   T10]      do_syscall_64+0xc6/0x1e0
[  655.036281][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.036281][   T10] 
[  655.038301][   T10] unregister_netdevice: waiting for ns2eth3 to become free. Usage count = 4
[  655.039187][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  655.039187][   T10]      netdev_get_by_index+0x5e/0x80
[  655.039187][   T10]      fib6_nh_init+0x3d8/0x15b0
[  655.039187][   T10]      ip6_route_info_create+0xf18/0x17d0
[  655.039187][   T10]      addrconf_f6i_alloc+0x244/0x410
[  655.039187][   T10]      ipv6_add_addr+0x411/0x2000
[  655.039187][   T10]      inet6_addr_add+0x30e/0xa40
[  655.039187][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  655.039187][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.039187][   T10]      netlink_rcv_skb+0x130/0x360
[  655.039187][   T10]      netlink_unicast+0x449/0x710
[  655.039187][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.039187][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.039187][   T10]      ___sys_sendmsg+0xee/0x170
[  655.039187][   T10]      __sys_sendmsg+0xcd/0x170
[  655.039187][   T10]      do_syscall_64+0xc6/0x1e0
[  655.039187][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.039187][   T10] 
[  655.041391][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  655.041391][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  655.041391][   T10]      ipv6_find_idev+0x102/0x170
[  655.041391][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  655.041391][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.041391][   T10]      netlink_rcv_skb+0x130/0x360
[  655.041391][   T10]      netlink_unicast+0x449/0x710
[  655.041391][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.041391][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.041391][   T10]      ___sys_sendmsg+0xee/0x170
[  655.041391][   T10]      __sys_sendmsg+0xcd/0x170
[  655.041391][   T10]      do_syscall_64+0xc6/0x1e0
[  655.041391][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.041391][   T10] 
[  655.043109][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  655.043109][   T10]      neigh_parms_alloc+0x1e5/0x510
[  655.043109][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  655.043109][   T10]      ipv6_find_idev+0x102/0x170
[  655.043109][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  655.043109][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.043109][   T10]      netlink_rcv_skb+0x130/0x360
[  655.043109][   T10]      netlink_unicast+0x449/0x710
[  655.043109][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.043109][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.043109][   T10]      ___sys_sendmsg+0xee/0x170
[  655.043109][   T10]      __sys_sendmsg+0xcd/0x170
[  655.043109][   T10]      do_syscall_64+0xc6/0x1e0
[  655.043109][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.043109][   T10] 
[  655.045025][   T10] unregister_netdevice: waiting for ns1eth2 to become free. Usage count = 4
[  655.045310][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  655.045310][   T10]      netdev_get_by_index+0x5e/0x80
[  655.045310][   T10]      fib6_nh_init+0x3d8/0x15b0
[  655.045310][   T10]      ip6_route_info_create+0xf18/0x17d0
[  655.045310][   T10]      addrconf_f6i_alloc+0x244/0x410
[  655.045310][   T10]      ipv6_add_addr+0x411/0x2000
[  655.045310][   T10]      inet6_addr_add+0x30e/0xa40
[  655.045310][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  655.045310][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.045310][   T10]      netlink_rcv_skb+0x130/0x360
[  655.045310][   T10]      netlink_unicast+0x449/0x710
[  655.045310][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.045310][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.045310][   T10]      ___sys_sendmsg+0xee/0x170
[  655.045310][   T10]      __sys_sendmsg+0xcd/0x170
[  655.045310][   T10]      do_syscall_64+0xc6/0x1e0
[  655.045310][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.045310][   T10] 
[  655.047515][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  655.047515][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  655.047515][   T10]      ipv6_find_idev+0x102/0x170
[  655.047515][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  655.047515][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.047515][   T10]      netlink_rcv_skb+0x130/0x360
[  655.047515][   T10]      netlink_unicast+0x449/0x710
[  655.047515][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.047515][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.047515][   T10]      ___sys_sendmsg+0xee/0x170
[  655.047515][   T10]      __sys_sendmsg+0xcd/0x170
[  655.047515][   T10]      do_syscall_64+0xc6/0x1e0
[  655.047515][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.047515][   T10] 
[  655.049226][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  655.049226][   T10]      neigh_parms_alloc+0x1e5/0x510
[  655.049226][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  655.049226][   T10]      ipv6_find_idev+0x102/0x170
[  655.049226][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  655.049226][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.049226][   T10]      netlink_rcv_skb+0x130/0x360
[  655.049226][   T10]      netlink_unicast+0x449/0x710
[  655.049226][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.049226][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.049226][   T10]      ___sys_sendmsg+0xee/0x170
[  655.049226][   T10]      __sys_sendmsg+0xcd/0x170
[  655.049226][   T10]      do_syscall_64+0xc6/0x1e0
[  655.049226][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.049226][   T10] 
[  655.051131][   T10] unregister_netdevice: waiting for ns2eth2 to become free. Usage count = 4
[  655.051423][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  655.051423][   T10]      netdev_get_by_index+0x5e/0x80
[  655.051423][   T10]      fib6_nh_init+0x3d8/0x15b0
[  655.051423][   T10]      ip6_route_info_create+0xf18/0x17d0
[  655.051423][   T10]      addrconf_f6i_alloc+0x244/0x410
[  655.051423][   T10]      ipv6_add_addr+0x411/0x2000
[  655.051423][   T10]      inet6_addr_add+0x30e/0xa40
[  655.051423][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  655.051423][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.051423][   T10]      netlink_rcv_skb+0x130/0x360
[  655.051423][   T10]      netlink_unicast+0x449/0x710
[  655.051423][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.051423][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.051423][   T10]      ___sys_sendmsg+0xee/0x170
[  655.051423][   T10]      __sys_sendmsg+0xcd/0x170
[  655.051423][   T10]      do_syscall_64+0xc6/0x1e0
[  655.051423][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.051423][   T10] 
[  655.053669][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  655.053669][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  655.053669][   T10]      ipv6_find_idev+0x102/0x170
[  655.053669][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  655.053669][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.053669][   T10]      netlink_rcv_skb+0x130/0x360
[  655.053669][   T10]      netlink_unicast+0x449/0x710
[  655.053669][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.053669][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.053669][   T10]      ___sys_sendmsg+0xee/0x170
[  655.053669][   T10]      __sys_sendmsg+0xcd/0x170
[  655.053669][   T10]      do_syscall_64+0xc6/0x1e0
[  655.053669][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.053669][   T10] 
[  655.055484][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  655.055484][   T10]      neigh_parms_alloc+0x1e5/0x510
[  655.055484][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  655.055484][   T10]      ipv6_find_idev+0x102/0x170
[  655.055484][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  655.055484][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.055484][   T10]      netlink_rcv_skb+0x130/0x360
[  655.055484][   T10]      netlink_unicast+0x449/0x710
[  655.055484][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.055484][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.055484][   T10]      ___sys_sendmsg+0xee/0x170
[  655.055484][   T10]      __sys_sendmsg+0xcd/0x170
[  655.055484][   T10]      do_syscall_64+0xc6/0x1e0
[  655.055484][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.055484][   T10] 
[  655.057687][   T10] unregister_netdevice: waiting for ns1eth1 to become free. Usage count = 4
[  655.058044][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  655.058044][   T10]      netdev_get_by_index+0x5e/0x80
[  655.058044][   T10]      fib6_nh_init+0x3d8/0x15b0
[  655.058044][   T10]      ip6_route_info_create+0xf18/0x17d0
[  655.058044][   T10]      addrconf_f6i_alloc+0x244/0x410
[  655.058044][   T10]      ipv6_add_addr+0x411/0x2000
[  655.058044][   T10]      inet6_addr_add+0x30e/0xa40
[  655.058044][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  655.058044][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.058044][   T10]      netlink_rcv_skb+0x130/0x360
[  655.058044][   T10]      netlink_unicast+0x449/0x710
[  655.058044][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.058044][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.058044][   T10]      ___sys_sendmsg+0xee/0x170
[  655.058044][   T10]      __sys_sendmsg+0xcd/0x170
[  655.058044][   T10]      do_syscall_64+0xc6/0x1e0
[  655.058044][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.058044][   T10] 
[  655.060645][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  655.060645][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  655.060645][   T10]      ipv6_find_idev+0x102/0x170
[  655.060645][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  655.060645][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.060645][   T10]      netlink_rcv_skb+0x130/0x360
[  655.060645][   T10]      netlink_unicast+0x449/0x710
[  655.060645][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.060645][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.060645][   T10]      ___sys_sendmsg+0xee/0x170
[  655.060645][   T10]      __sys_sendmsg+0xcd/0x170
[  655.060645][   T10]      do_syscall_64+0xc6/0x1e0
[  655.060645][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.060645][   T10] 
[  655.062492][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  655.062492][   T10]      neigh_parms_alloc+0x1e5/0x510
[  655.062492][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  655.062492][   T10]      ipv6_find_idev+0x102/0x170
[  655.062492][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  655.062492][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.062492][   T10]      netlink_rcv_skb+0x130/0x360
[  655.062492][   T10]      netlink_unicast+0x449/0x710
[  655.062492][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.062492][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.062492][   T10]      ___sys_sendmsg+0xee/0x170
[  655.062492][   T10]      __sys_sendmsg+0xcd/0x170
[  655.062492][   T10]      do_syscall_64+0xc6/0x1e0
[  655.062492][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.062492][   T10] 
[  655.064603][   T10] unregister_netdevice: waiting for ns2eth1 to become free. Usage count = 4
[  655.064948][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  655.064948][   T10]      netdev_get_by_index+0x5e/0x80
[  655.064948][   T10]      fib6_nh_init+0x3d8/0x15b0
[  655.064948][   T10]      ip6_route_info_create+0xf18/0x17d0
[  655.064948][   T10]      addrconf_f6i_alloc+0x244/0x410
[  655.064948][   T10]      ipv6_add_addr+0x411/0x2000
[  655.064948][   T10]      inet6_addr_add+0x30e/0xa40
[  655.064948][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  655.064948][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.064948][   T10]      netlink_rcv_skb+0x130/0x360
[  655.064948][   T10]      netlink_unicast+0x449/0x710
[  655.064948][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.064948][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.064948][   T10]      ___sys_sendmsg+0xee/0x170
[  655.064948][   T10]      __sys_sendmsg+0xcd/0x170
[  655.064948][   T10]      do_syscall_64+0xc6/0x1e0
[  655.064948][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.064948][   T10] 
[  655.067155][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  655.067155][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  655.067155][   T10]      ipv6_find_idev+0x102/0x170
[  655.067155][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  655.067155][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.067155][   T10]      netlink_rcv_skb+0x130/0x360
[  655.067155][   T10]      netlink_unicast+0x449/0x710
[  655.067155][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.067155][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.067155][   T10]      ___sys_sendmsg+0xee/0x170
[  655.067155][   T10]      __sys_sendmsg+0xcd/0x170
[  655.067155][   T10]      do_syscall_64+0xc6/0x1e0
[  655.067155][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.067155][   T10] 
[  655.068868][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  655.068868][   T10]      neigh_parms_alloc+0x1e5/0x510
[  655.068868][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  655.068868][   T10]      ipv6_find_idev+0x102/0x170
[  655.068868][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  655.068868][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  655.068868][   T10]      netlink_rcv_skb+0x130/0x360
[  655.068868][   T10]      netlink_unicast+0x449/0x710
[  655.068868][   T10]      netlink_sendmsg+0x723/0xbe0
[  655.068868][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  655.068868][   T10]      ___sys_sendmsg+0xee/0x170
[  655.068868][   T10]      __sys_sendmsg+0xcd/0x170
[  655.068868][   T10]      do_syscall_64+0xc6/0x1e0
[  655.068868][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  655.068868][   T10] 
[  665.195722][   T10] unregister_netdevice: waiting for ns1eth4 to become free. Usage count = 4
[  665.196064][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  665.196064][   T10]      netdev_get_by_index+0x5e/0x80
[  665.196064][   T10]      fib6_nh_init+0x3d8/0x15b0
[  665.196064][   T10]      ip6_route_info_create+0xf18/0x17d0
[  665.196064][   T10]      addrconf_f6i_alloc+0x244/0x410
[  665.196064][   T10]      ipv6_add_addr+0x411/0x2000
[  665.196064][   T10]      inet6_addr_add+0x30e/0xa40
[  665.196064][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  665.196064][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.196064][   T10]      netlink_rcv_skb+0x130/0x360
[  665.196064][   T10]      netlink_unicast+0x449/0x710
[  665.196064][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.196064][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.196064][   T10]      ___sys_sendmsg+0xee/0x170
[  665.196064][   T10]      __sys_sendmsg+0xcd/0x170
[  665.196064][   T10]      do_syscall_64+0xc6/0x1e0
[  665.196064][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.196064][   T10] 
[  665.198297][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  665.198297][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  665.198297][   T10]      ipv6_find_idev+0x102/0x170
[  665.198297][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  665.198297][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.198297][   T10]      netlink_rcv_skb+0x130/0x360
[  665.198297][   T10]      netlink_unicast+0x449/0x710
[  665.198297][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.198297][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.198297][   T10]      ___sys_sendmsg+0xee/0x170
[  665.198297][   T10]      __sys_sendmsg+0xcd/0x170
[  665.198297][   T10]      do_syscall_64+0xc6/0x1e0
[  665.198297][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.198297][   T10] 
[  665.200008][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  665.200008][   T10]      neigh_parms_alloc+0x1e5/0x510
[  665.200008][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  665.200008][   T10]      ipv6_find_idev+0x102/0x170
[  665.200008][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  665.200008][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.200008][   T10]      netlink_rcv_skb+0x130/0x360
[  665.200008][   T10]      netlink_unicast+0x449/0x710
[  665.200008][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.200008][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.200008][   T10]      ___sys_sendmsg+0xee/0x170
[  665.200008][   T10]      __sys_sendmsg+0xcd/0x170
[  665.200008][   T10]      do_syscall_64+0xc6/0x1e0
[  665.200008][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.200008][   T10] 
[  665.202358][   T10] unregister_netdevice: waiting for ns2eth4 to become free. Usage count = 4
[  665.202653][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  665.202653][   T10]      netdev_get_by_index+0x5e/0x80
[  665.202653][   T10]      fib6_nh_init+0x3d8/0x15b0
[  665.202653][   T10]      ip6_route_info_create+0xf18/0x17d0
[  665.202653][   T10]      addrconf_f6i_alloc+0x244/0x410
[  665.202653][   T10]      ipv6_add_addr+0x411/0x2000
[  665.202653][   T10]      inet6_addr_add+0x30e/0xa40
[  665.202653][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  665.202653][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.202653][   T10]      netlink_rcv_skb+0x130/0x360
[  665.202653][   T10]      netlink_unicast+0x449/0x710
[  665.202653][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.202653][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.202653][   T10]      ___sys_sendmsg+0xee/0x170
[  665.202653][   T10]      __sys_sendmsg+0xcd/0x170
[  665.202653][   T10]      do_syscall_64+0xc6/0x1e0
[  665.202653][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.202653][   T10] 
[  665.204850][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  665.204850][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  665.204850][   T10]      ipv6_find_idev+0x102/0x170
[  665.204850][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  665.204850][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.204850][   T10]      netlink_rcv_skb+0x130/0x360
[  665.204850][   T10]      netlink_unicast+0x449/0x710
[  665.204850][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.204850][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.204850][   T10]      ___sys_sendmsg+0xee/0x170
[  665.204850][   T10]      __sys_sendmsg+0xcd/0x170
[  665.204850][   T10]      do_syscall_64+0xc6/0x1e0
[  665.204850][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.204850][   T10] 
[  665.206587][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  665.206587][   T10]      neigh_parms_alloc+0x1e5/0x510
[  665.206587][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  665.206587][   T10]      ipv6_find_idev+0x102/0x170
[  665.206587][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  665.206587][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.206587][   T10]      netlink_rcv_skb+0x130/0x360
[  665.206587][   T10]      netlink_unicast+0x449/0x710
[  665.206587][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.206587][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.206587][   T10]      ___sys_sendmsg+0xee/0x170
[  665.206587][   T10]      __sys_sendmsg+0xcd/0x170
[  665.206587][   T10]      do_syscall_64+0xc6/0x1e0
[  665.206587][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.206587][   T10] 
[  665.208424][   T10] unregister_netdevice: waiting for ns1eth3 to become free. Usage count = 4
[  665.208718][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  665.208718][   T10]      netdev_get_by_index+0x5e/0x80
[  665.208718][   T10]      fib6_nh_init+0x3d8/0x15b0
[  665.208718][   T10]      ip6_route_info_create+0xf18/0x17d0
[  665.208718][   T10]      addrconf_f6i_alloc+0x244/0x410
[  665.208718][   T10]      ipv6_add_addr+0x411/0x2000
[  665.208718][   T10]      inet6_addr_add+0x30e/0xa40
[  665.208718][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  665.208718][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.208718][   T10]      netlink_rcv_skb+0x130/0x360
[  665.208718][   T10]      netlink_unicast+0x449/0x710
[  665.208718][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.208718][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.208718][   T10]      ___sys_sendmsg+0xee/0x170
[  665.208718][   T10]      __sys_sendmsg+0xcd/0x170
[  665.208718][   T10]      do_syscall_64+0xc6/0x1e0
[  665.208718][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.208718][   T10] 
[  665.210925][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  665.210925][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  665.210925][   T10]      ipv6_find_idev+0x102/0x170
[  665.210925][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  665.210925][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.210925][   T10]      netlink_rcv_skb+0x130/0x360
[  665.210925][   T10]      netlink_unicast+0x449/0x710
[  665.210925][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.210925][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.210925][   T10]      ___sys_sendmsg+0xee/0x170
[  665.210925][   T10]      __sys_sendmsg+0xcd/0x170
[  665.210925][   T10]      do_syscall_64+0xc6/0x1e0
[  665.210925][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.210925][   T10] 
[  665.212612][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  665.212612][   T10]      neigh_parms_alloc+0x1e5/0x510
[  665.212612][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  665.212612][   T10]      ipv6_find_idev+0x102/0x170
[  665.212612][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  665.212612][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.212612][   T10]      netlink_rcv_skb+0x130/0x360
[  665.212612][   T10]      netlink_unicast+0x449/0x710
[  665.212612][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.212612][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.212612][   T10]      ___sys_sendmsg+0xee/0x170
[  665.212612][   T10]      __sys_sendmsg+0xcd/0x170
[  665.212612][   T10]      do_syscall_64+0xc6/0x1e0
[  665.212612][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.212612][   T10] 
[  665.214894][   T10] unregister_netdevice: waiting for ns2eth3 to become free. Usage count = 4
[  665.215180][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  665.215180][   T10]      netdev_get_by_index+0x5e/0x80
[  665.215180][   T10]      fib6_nh_init+0x3d8/0x15b0
[  665.215180][   T10]      ip6_route_info_create+0xf18/0x17d0
[  665.215180][   T10]      addrconf_f6i_alloc+0x244/0x410
[  665.215180][   T10]      ipv6_add_addr+0x411/0x2000
[  665.215180][   T10]      inet6_addr_add+0x30e/0xa40
[  665.215180][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  665.215180][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.215180][   T10]      netlink_rcv_skb+0x130/0x360
[  665.215180][   T10]      netlink_unicast+0x449/0x710
[  665.215180][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.215180][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.215180][   T10]      ___sys_sendmsg+0xee/0x170
[  665.215180][   T10]      __sys_sendmsg+0xcd/0x170
[  665.215180][   T10]      do_syscall_64+0xc6/0x1e0
[  665.215180][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.215180][   T10] 
[  665.217428][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  665.217428][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  665.217428][   T10]      ipv6_find_idev+0x102/0x170
[  665.217428][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  665.217428][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.217428][   T10]      netlink_rcv_skb+0x130/0x360
[  665.217428][   T10]      netlink_unicast+0x449/0x710
[  665.217428][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.217428][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.217428][   T10]      ___sys_sendmsg+0xee/0x170
[  665.217428][   T10]      __sys_sendmsg+0xcd/0x170
[  665.217428][   T10]      do_syscall_64+0xc6/0x1e0
[  665.217428][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.217428][   T10] 
[  665.219121][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  665.219121][   T10]      neigh_parms_alloc+0x1e5/0x510
[  665.219121][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  665.219121][   T10]      ipv6_find_idev+0x102/0x170
[  665.219121][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  665.219121][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.219121][   T10]      netlink_rcv_skb+0x130/0x360
[  665.219121][   T10]      netlink_unicast+0x449/0x710
[  665.219121][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.219121][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.219121][   T10]      ___sys_sendmsg+0xee/0x170
[  665.219121][   T10]      __sys_sendmsg+0xcd/0x170
[  665.219121][   T10]      do_syscall_64+0xc6/0x1e0
[  665.219121][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.219121][   T10] 
[  665.221175][   T10] unregister_netdevice: waiting for ns1eth2 to become free. Usage count = 4
[  665.221529][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  665.221529][   T10]      netdev_get_by_index+0x5e/0x80
[  665.221529][   T10]      fib6_nh_init+0x3d8/0x15b0
[  665.221529][   T10]      ip6_route_info_create+0xf18/0x17d0
[  665.221529][   T10]      addrconf_f6i_alloc+0x244/0x410
[  665.221529][   T10]      ipv6_add_addr+0x411/0x2000
[  665.221529][   T10]      inet6_addr_add+0x30e/0xa40
[  665.221529][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  665.221529][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.221529][   T10]      netlink_rcv_skb+0x130/0x360
[  665.221529][   T10]      netlink_unicast+0x449/0x710
[  665.221529][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.221529][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.221529][   T10]      ___sys_sendmsg+0xee/0x170
[  665.221529][   T10]      __sys_sendmsg+0xcd/0x170
[  665.221529][   T10]      do_syscall_64+0xc6/0x1e0
[  665.221529][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.221529][   T10] 
[  665.223926][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  665.223926][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  665.223926][   T10]      ipv6_find_idev+0x102/0x170
[  665.223926][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  665.223926][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.223926][   T10]      netlink_rcv_skb+0x130/0x360
[  665.223926][   T10]      netlink_unicast+0x449/0x710
[  665.223926][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.223926][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.223926][   T10]      ___sys_sendmsg+0xee/0x170
[  665.223926][   T10]      __sys_sendmsg+0xcd/0x170
[  665.223926][   T10]      do_syscall_64+0xc6/0x1e0
[  665.223926][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.223926][   T10] 
[  665.225828][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  665.225828][   T10]      neigh_parms_alloc+0x1e5/0x510
[  665.225828][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  665.225828][   T10]      ipv6_find_idev+0x102/0x170
[  665.225828][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  665.225828][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.225828][   T10]      netlink_rcv_skb+0x130/0x360
[  665.225828][   T10]      netlink_unicast+0x449/0x710
[  665.225828][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.225828][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.225828][   T10]      ___sys_sendmsg+0xee/0x170
[  665.225828][   T10]      __sys_sendmsg+0xcd/0x170
[  665.225828][   T10]      do_syscall_64+0xc6/0x1e0
[  665.225828][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.225828][   T10] 
[  665.227910][   T10] unregister_netdevice: waiting for ns2eth2 to become free. Usage count = 4
[  665.228201][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  665.228201][   T10]      netdev_get_by_index+0x5e/0x80
[  665.228201][   T10]      fib6_nh_init+0x3d8/0x15b0
[  665.228201][   T10]      ip6_route_info_create+0xf18/0x17d0
[  665.228201][   T10]      addrconf_f6i_alloc+0x244/0x410
[  665.228201][   T10]      ipv6_add_addr+0x411/0x2000
[  665.228201][   T10]      inet6_addr_add+0x30e/0xa40
[  665.228201][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  665.228201][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.228201][   T10]      netlink_rcv_skb+0x130/0x360
[  665.228201][   T10]      netlink_unicast+0x449/0x710
[  665.228201][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.228201][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.228201][   T10]      ___sys_sendmsg+0xee/0x170
[  665.228201][   T10]      __sys_sendmsg+0xcd/0x170
[  665.228201][   T10]      do_syscall_64+0xc6/0x1e0
[  665.228201][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.228201][   T10] 
[  665.230463][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  665.230463][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  665.230463][   T10]      ipv6_find_idev+0x102/0x170
[  665.230463][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  665.230463][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.230463][   T10]      netlink_rcv_skb+0x130/0x360
[  665.230463][   T10]      netlink_unicast+0x449/0x710
[  665.230463][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.230463][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.230463][   T10]      ___sys_sendmsg+0xee/0x170
[  665.230463][   T10]      __sys_sendmsg+0xcd/0x170
[  665.230463][   T10]      do_syscall_64+0xc6/0x1e0
[  665.230463][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.230463][   T10] 
[  665.232419][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  665.232419][   T10]      neigh_parms_alloc+0x1e5/0x510
[  665.232419][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  665.232419][   T10]      ipv6_find_idev+0x102/0x170
[  665.232419][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  665.232419][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.232419][   T10]      netlink_rcv_skb+0x130/0x360
[  665.232419][   T10]      netlink_unicast+0x449/0x710
[  665.232419][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.232419][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.232419][   T10]      ___sys_sendmsg+0xee/0x170
[  665.232419][   T10]      __sys_sendmsg+0xcd/0x170
[  665.232419][   T10]      do_syscall_64+0xc6/0x1e0
[  665.232419][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.232419][   T10] 
[  665.234588][   T10] unregister_netdevice: waiting for ns1eth1 to become free. Usage count = 4
[  665.234932][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  665.234932][   T10]      netdev_get_by_index+0x5e/0x80
[  665.234932][   T10]      fib6_nh_init+0x3d8/0x15b0
[  665.234932][   T10]      ip6_route_info_create+0xf18/0x17d0
[  665.234932][   T10]      addrconf_f6i_alloc+0x244/0x410
[  665.234932][   T10]      ipv6_add_addr+0x411/0x2000
[  665.234932][   T10]      inet6_addr_add+0x30e/0xa40
[  665.234932][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  665.234932][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.234932][   T10]      netlink_rcv_skb+0x130/0x360
[  665.234932][   T10]      netlink_unicast+0x449/0x710
[  665.234932][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.234932][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.234932][   T10]      ___sys_sendmsg+0xee/0x170
[  665.234932][   T10]      __sys_sendmsg+0xcd/0x170
[  665.234932][   T10]      do_syscall_64+0xc6/0x1e0
[  665.234932][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.234932][   T10] 
[  665.237152][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  665.237152][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  665.237152][   T10]      ipv6_find_idev+0x102/0x170
[  665.237152][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  665.237152][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.237152][   T10]      netlink_rcv_skb+0x130/0x360
[  665.237152][   T10]      netlink_unicast+0x449/0x710
[  665.237152][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.237152][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.237152][   T10]      ___sys_sendmsg+0xee/0x170
[  665.237152][   T10]      __sys_sendmsg+0xcd/0x170
[  665.237152][   T10]      do_syscall_64+0xc6/0x1e0
[  665.237152][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.237152][   T10] 
[  665.238999][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  665.238999][   T10]      neigh_parms_alloc+0x1e5/0x510
[  665.238999][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  665.238999][   T10]      ipv6_find_idev+0x102/0x170
[  665.238999][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  665.238999][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.238999][   T10]      netlink_rcv_skb+0x130/0x360
[  665.238999][   T10]      netlink_unicast+0x449/0x710
[  665.238999][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.238999][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.238999][   T10]      ___sys_sendmsg+0xee/0x170
[  665.238999][   T10]      __sys_sendmsg+0xcd/0x170
[  665.238999][   T10]      do_syscall_64+0xc6/0x1e0
[  665.238999][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.238999][   T10] 
[  665.240965][   T10] unregister_netdevice: waiting for ns2eth1 to become free. Usage count = 4
[  665.241250][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  665.241250][   T10]      netdev_get_by_index+0x5e/0x80
[  665.241250][   T10]      fib6_nh_init+0x3d8/0x15b0
[  665.241250][   T10]      ip6_route_info_create+0xf18/0x17d0
[  665.241250][   T10]      addrconf_f6i_alloc+0x244/0x410
[  665.241250][   T10]      ipv6_add_addr+0x411/0x2000
[  665.241250][   T10]      inet6_addr_add+0x30e/0xa40
[  665.241250][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  665.241250][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.241250][   T10]      netlink_rcv_skb+0x130/0x360
[  665.241250][   T10]      netlink_unicast+0x449/0x710
[  665.241250][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.241250][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.241250][   T10]      ___sys_sendmsg+0xee/0x170
[  665.241250][   T10]      __sys_sendmsg+0xcd/0x170
[  665.241250][   T10]      do_syscall_64+0xc6/0x1e0
[  665.241250][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.241250][   T10] 
[  665.243534][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  665.243534][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  665.243534][   T10]      ipv6_find_idev+0x102/0x170
[  665.243534][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  665.243534][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.243534][   T10]      netlink_rcv_skb+0x130/0x360
[  665.243534][   T10]      netlink_unicast+0x449/0x710
[  665.243534][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.243534][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.243534][   T10]      ___sys_sendmsg+0xee/0x170
[  665.243534][   T10]      __sys_sendmsg+0xcd/0x170
[  665.243534][   T10]      do_syscall_64+0xc6/0x1e0
[  665.243534][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.243534][   T10] 
[  665.245252][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  665.245252][   T10]      neigh_parms_alloc+0x1e5/0x510
[  665.245252][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  665.245252][   T10]      ipv6_find_idev+0x102/0x170
[  665.245252][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  665.245252][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  665.245252][   T10]      netlink_rcv_skb+0x130/0x360
[  665.245252][   T10]      netlink_unicast+0x449/0x710
[  665.245252][   T10]      netlink_sendmsg+0x723/0xbe0
[  665.245252][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  665.245252][   T10]      ___sys_sendmsg+0xee/0x170
[  665.245252][   T10]      __sys_sendmsg+0xcd/0x170
[  665.245252][   T10]      do_syscall_64+0xc6/0x1e0
[  665.245252][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  665.245252][   T10] 
[  675.315761][   T10] unregister_netdevice: waiting for ns1eth4 to become free. Usage count = 4
[  675.316277][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  675.316277][   T10]      netdev_get_by_index+0x5e/0x80
[  675.316277][   T10]      fib6_nh_init+0x3d8/0x15b0
[  675.316277][   T10]      ip6_route_info_create+0xf18/0x17d0
[  675.316277][   T10]      addrconf_f6i_alloc+0x244/0x410
[  675.316277][   T10]      ipv6_add_addr+0x411/0x2000
[  675.316277][   T10]      inet6_addr_add+0x30e/0xa40
[  675.316277][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  675.316277][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.316277][   T10]      netlink_rcv_skb+0x130/0x360
[  675.316277][   T10]      netlink_unicast+0x449/0x710
[  675.316277][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.316277][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.316277][   T10]      ___sys_sendmsg+0xee/0x170
[  675.316277][   T10]      __sys_sendmsg+0xcd/0x170
[  675.316277][   T10]      do_syscall_64+0xc6/0x1e0
[  675.316277][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.316277][   T10] 
[  675.318636][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  675.318636][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  675.318636][   T10]      ipv6_find_idev+0x102/0x170
[  675.318636][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  675.318636][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.318636][   T10]      netlink_rcv_skb+0x130/0x360
[  675.318636][   T10]      netlink_unicast+0x449/0x710
[  675.318636][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.318636][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.318636][   T10]      ___sys_sendmsg+0xee/0x170
[  675.318636][   T10]      __sys_sendmsg+0xcd/0x170
[  675.318636][   T10]      do_syscall_64+0xc6/0x1e0
[  675.318636][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.318636][   T10] 
[  675.320416][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  675.320416][   T10]      neigh_parms_alloc+0x1e5/0x510
[  675.320416][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  675.320416][   T10]      ipv6_find_idev+0x102/0x170
[  675.320416][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  675.320416][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.320416][   T10]      netlink_rcv_skb+0x130/0x360
[  675.320416][   T10]      netlink_unicast+0x449/0x710
[  675.320416][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.320416][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.320416][   T10]      ___sys_sendmsg+0xee/0x170
[  675.320416][   T10]      __sys_sendmsg+0xcd/0x170
[  675.320416][   T10]      do_syscall_64+0xc6/0x1e0
[  675.320416][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.320416][   T10] 
[  675.322350][   T10] unregister_netdevice: waiting for ns2eth4 to become free. Usage count = 4
[  675.322661][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  675.322661][   T10]      netdev_get_by_index+0x5e/0x80
[  675.322661][   T10]      fib6_nh_init+0x3d8/0x15b0
[  675.322661][   T10]      ip6_route_info_create+0xf18/0x17d0
[  675.322661][   T10]      addrconf_f6i_alloc+0x244/0x410
[  675.322661][   T10]      ipv6_add_addr+0x411/0x2000
[  675.322661][   T10]      inet6_addr_add+0x30e/0xa40
[  675.322661][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  675.322661][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.322661][   T10]      netlink_rcv_skb+0x130/0x360
[  675.322661][   T10]      netlink_unicast+0x449/0x710
[  675.322661][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.322661][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.322661][   T10]      ___sys_sendmsg+0xee/0x170
[  675.322661][   T10]      __sys_sendmsg+0xcd/0x170
[  675.322661][   T10]      do_syscall_64+0xc6/0x1e0
[  675.322661][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.322661][   T10] 
[  675.324971][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  675.324971][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  675.324971][   T10]      ipv6_find_idev+0x102/0x170
[  675.324971][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  675.324971][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.324971][   T10]      netlink_rcv_skb+0x130/0x360
[  675.324971][   T10]      netlink_unicast+0x449/0x710
[  675.324971][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.324971][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.324971][   T10]      ___sys_sendmsg+0xee/0x170
[  675.324971][   T10]      __sys_sendmsg+0xcd/0x170
[  675.324971][   T10]      do_syscall_64+0xc6/0x1e0
[  675.324971][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.324971][   T10] 
[  675.326752][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  675.326752][   T10]      neigh_parms_alloc+0x1e5/0x510
[  675.326752][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  675.326752][   T10]      ipv6_find_idev+0x102/0x170
[  675.326752][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  675.326752][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.326752][   T10]      netlink_rcv_skb+0x130/0x360
[  675.326752][   T10]      netlink_unicast+0x449/0x710
[  675.326752][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.326752][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.326752][   T10]      ___sys_sendmsg+0xee/0x170
[  675.326752][   T10]      __sys_sendmsg+0xcd/0x170
[  675.326752][   T10]      do_syscall_64+0xc6/0x1e0
[  675.326752][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.326752][   T10] 
[  675.328672][   T10] unregister_netdevice: waiting for ns1eth3 to become free. Usage count = 4
[  675.328971][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  675.328971][   T10]      netdev_get_by_index+0x5e/0x80
[  675.328971][   T10]      fib6_nh_init+0x3d8/0x15b0
[  675.328971][   T10]      ip6_route_info_create+0xf18/0x17d0
[  675.328971][   T10]      addrconf_f6i_alloc+0x244/0x410
[  675.328971][   T10]      ipv6_add_addr+0x411/0x2000
[  675.328971][   T10]      inet6_addr_add+0x30e/0xa40
[  675.328971][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  675.328971][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.328971][   T10]      netlink_rcv_skb+0x130/0x360
[  675.328971][   T10]      netlink_unicast+0x449/0x710
[  675.328971][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.328971][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.328971][   T10]      ___sys_sendmsg+0xee/0x170
[  675.328971][   T10]      __sys_sendmsg+0xcd/0x170
[  675.328971][   T10]      do_syscall_64+0xc6/0x1e0
[  675.328971][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.328971][   T10] 
[  675.331256][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  675.331256][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  675.331256][   T10]      ipv6_find_idev+0x102/0x170
[  675.331256][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  675.331256][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.331256][   T10]      netlink_rcv_skb+0x130/0x360
[  675.331256][   T10]      netlink_unicast+0x449/0x710
[  675.331256][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.331256][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.331256][   T10]      ___sys_sendmsg+0xee/0x170
[  675.331256][   T10]      __sys_sendmsg+0xcd/0x170
[  675.331256][   T10]      do_syscall_64+0xc6/0x1e0
[  675.331256][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.331256][   T10] 
[  675.333028][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  675.333028][   T10]      neigh_parms_alloc+0x1e5/0x510
[  675.333028][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  675.333028][   T10]      ipv6_find_idev+0x102/0x170
[  675.333028][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  675.333028][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.333028][   T10]      netlink_rcv_skb+0x130/0x360
[  675.333028][   T10]      netlink_unicast+0x449/0x710
[  675.333028][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.333028][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.333028][   T10]      ___sys_sendmsg+0xee/0x170
[  675.333028][   T10]      __sys_sendmsg+0xcd/0x170
[  675.333028][   T10]      do_syscall_64+0xc6/0x1e0
[  675.333028][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.333028][   T10] 
[  675.334975][   T10] unregister_netdevice: waiting for ns2eth3 to become free. Usage count = 4
[  675.335269][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  675.335269][   T10]      netdev_get_by_index+0x5e/0x80
[  675.335269][   T10]      fib6_nh_init+0x3d8/0x15b0
[  675.335269][   T10]      ip6_route_info_create+0xf18/0x17d0
[  675.335269][   T10]      addrconf_f6i_alloc+0x244/0x410
[  675.335269][   T10]      ipv6_add_addr+0x411/0x2000
[  675.335269][   T10]      inet6_addr_add+0x30e/0xa40
[  675.335269][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  675.335269][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.335269][   T10]      netlink_rcv_skb+0x130/0x360
[  675.335269][   T10]      netlink_unicast+0x449/0x710
[  675.335269][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.335269][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.335269][   T10]      ___sys_sendmsg+0xee/0x170
[  675.335269][   T10]      __sys_sendmsg+0xcd/0x170
[  675.335269][   T10]      do_syscall_64+0xc6/0x1e0
[  675.335269][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.335269][   T10] 
[  675.337581][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  675.337581][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  675.337581][   T10]      ipv6_find_idev+0x102/0x170
[  675.337581][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  675.337581][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.337581][   T10]      netlink_rcv_skb+0x130/0x360
[  675.337581][   T10]      netlink_unicast+0x449/0x710
[  675.337581][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.337581][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.337581][   T10]      ___sys_sendmsg+0xee/0x170
[  675.337581][   T10]      __sys_sendmsg+0xcd/0x170
[  675.337581][   T10]      do_syscall_64+0xc6/0x1e0
[  675.337581][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.337581][   T10] 
[  675.339297][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  675.339297][   T10]      neigh_parms_alloc+0x1e5/0x510
[  675.339297][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  675.339297][   T10]      ipv6_find_idev+0x102/0x170
[  675.339297][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  675.339297][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.339297][   T10]      netlink_rcv_skb+0x130/0x360
[  675.339297][   T10]      netlink_unicast+0x449/0x710
[  675.339297][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.339297][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.339297][   T10]      ___sys_sendmsg+0xee/0x170
[  675.339297][   T10]      __sys_sendmsg+0xcd/0x170
[  675.339297][   T10]      do_syscall_64+0xc6/0x1e0
[  675.339297][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.339297][   T10] 
[  675.341555][   T10] unregister_netdevice: waiting for ns1eth2 to become free. Usage count = 4
[  675.342188][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  675.342188][   T10]      netdev_get_by_index+0x5e/0x80
[  675.342188][   T10]      fib6_nh_init+0x3d8/0x15b0
[  675.342188][   T10]      ip6_route_info_create+0xf18/0x17d0
[  675.342188][   T10]      addrconf_f6i_alloc+0x244/0x410
[  675.342188][   T10]      ipv6_add_addr+0x411/0x2000
[  675.342188][   T10]      inet6_addr_add+0x30e/0xa40
[  675.342188][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  675.342188][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.342188][   T10]      netlink_rcv_skb+0x130/0x360
[  675.342188][   T10]      netlink_unicast+0x449/0x710
[  675.342188][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.342188][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.342188][   T10]      ___sys_sendmsg+0xee/0x170
[  675.342188][   T10]      __sys_sendmsg+0xcd/0x170
[  675.342188][   T10]      do_syscall_64+0xc6/0x1e0
[  675.342188][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.342188][   T10] 
[  675.344378][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  675.344378][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  675.344378][   T10]      ipv6_find_idev+0x102/0x170
[  675.344378][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  675.344378][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.344378][   T10]      netlink_rcv_skb+0x130/0x360
[  675.344378][   T10]      netlink_unicast+0x449/0x710
[  675.344378][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.344378][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.344378][   T10]      ___sys_sendmsg+0xee/0x170
[  675.344378][   T10]      __sys_sendmsg+0xcd/0x170
[  675.344378][   T10]      do_syscall_64+0xc6/0x1e0
[  675.344378][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.344378][   T10] 
[  675.346076][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  675.346076][   T10]      neigh_parms_alloc+0x1e5/0x510
[  675.346076][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  675.346076][   T10]      ipv6_find_idev+0x102/0x170
[  675.346076][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  675.346076][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.346076][   T10]      netlink_rcv_skb+0x130/0x360
[  675.346076][   T10]      netlink_unicast+0x449/0x710
[  675.346076][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.346076][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.346076][   T10]      ___sys_sendmsg+0xee/0x170
[  675.346076][   T10]      __sys_sendmsg+0xcd/0x170
[  675.346076][   T10]      do_syscall_64+0xc6/0x1e0
[  675.346076][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.346076][   T10] 
[  675.347934][   T10] unregister_netdevice: waiting for ns2eth2 to become free. Usage count = 4
[  675.348227][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  675.348227][   T10]      netdev_get_by_index+0x5e/0x80
[  675.348227][   T10]      fib6_nh_init+0x3d8/0x15b0
[  675.348227][   T10]      ip6_route_info_create+0xf18/0x17d0
[  675.348227][   T10]      addrconf_f6i_alloc+0x244/0x410
[  675.348227][   T10]      ipv6_add_addr+0x411/0x2000
[  675.348227][   T10]      inet6_addr_add+0x30e/0xa40
[  675.348227][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  675.348227][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.348227][   T10]      netlink_rcv_skb+0x130/0x360
[  675.348227][   T10]      netlink_unicast+0x449/0x710
[  675.348227][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.348227][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.348227][   T10]      ___sys_sendmsg+0xee/0x170
[  675.348227][   T10]      __sys_sendmsg+0xcd/0x170
[  675.348227][   T10]      do_syscall_64+0xc6/0x1e0
[  675.348227][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.348227][   T10] 
[  675.350458][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  675.350458][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  675.350458][   T10]      ipv6_find_idev+0x102/0x170
[  675.350458][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  675.350458][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.350458][   T10]      netlink_rcv_skb+0x130/0x360
[  675.350458][   T10]      netlink_unicast+0x449/0x710
[  675.350458][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.350458][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.350458][   T10]      ___sys_sendmsg+0xee/0x170
[  675.350458][   T10]      __sys_sendmsg+0xcd/0x170
[  675.350458][   T10]      do_syscall_64+0xc6/0x1e0
[  675.350458][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.350458][   T10] 
[  675.352226][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  675.352226][   T10]      neigh_parms_alloc+0x1e5/0x510
[  675.352226][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  675.352226][   T10]      ipv6_find_idev+0x102/0x170
[  675.352226][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  675.352226][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.352226][   T10]      netlink_rcv_skb+0x130/0x360
[  675.352226][   T10]      netlink_unicast+0x449/0x710
[  675.352226][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.352226][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.352226][   T10]      ___sys_sendmsg+0xee/0x170
[  675.352226][   T10]      __sys_sendmsg+0xcd/0x170
[  675.352226][   T10]      do_syscall_64+0xc6/0x1e0
[  675.352226][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.352226][   T10] 
[  675.354308][   T10] unregister_netdevice: waiting for ns1eth1 to become free. Usage count = 4
[  675.354593][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  675.354593][   T10]      netdev_get_by_index+0x5e/0x80
[  675.354593][   T10]      fib6_nh_init+0x3d8/0x15b0
[  675.354593][   T10]      ip6_route_info_create+0xf18/0x17d0
[  675.354593][   T10]      addrconf_f6i_alloc+0x244/0x410
[  675.354593][   T10]      ipv6_add_addr+0x411/0x2000
[  675.354593][   T10]      inet6_addr_add+0x30e/0xa40
[  675.354593][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  675.354593][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.354593][   T10]      netlink_rcv_skb+0x130/0x360
[  675.354593][   T10]      netlink_unicast+0x449/0x710
[  675.354593][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.354593][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.354593][   T10]      ___sys_sendmsg+0xee/0x170
[  675.354593][   T10]      __sys_sendmsg+0xcd/0x170
[  675.354593][   T10]      do_syscall_64+0xc6/0x1e0
[  675.354593][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.354593][   T10] 
[  675.356998][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  675.356998][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  675.356998][   T10]      ipv6_find_idev+0x102/0x170
[  675.356998][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  675.356998][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.356998][   T10]      netlink_rcv_skb+0x130/0x360
[  675.356998][   T10]      netlink_unicast+0x449/0x710
[  675.356998][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.356998][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.356998][   T10]      ___sys_sendmsg+0xee/0x170
[  675.356998][   T10]      __sys_sendmsg+0xcd/0x170
[  675.356998][   T10]      do_syscall_64+0xc6/0x1e0
[  675.356998][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.356998][   T10] 
[  675.358898][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  675.358898][   T10]      neigh_parms_alloc+0x1e5/0x510
[  675.358898][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  675.358898][   T10]      ipv6_find_idev+0x102/0x170
[  675.358898][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  675.358898][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.358898][   T10]      netlink_rcv_skb+0x130/0x360
[  675.358898][   T10]      netlink_unicast+0x449/0x710
[  675.358898][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.358898][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.358898][   T10]      ___sys_sendmsg+0xee/0x170
[  675.358898][   T10]      __sys_sendmsg+0xcd/0x170
[  675.358898][   T10]      do_syscall_64+0xc6/0x1e0
[  675.358898][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.358898][   T10] 
[  675.360965][   T10] unregister_netdevice: waiting for ns2eth1 to become free. Usage count = 4
[  675.361303][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  675.361303][   T10]      netdev_get_by_index+0x5e/0x80
[  675.361303][   T10]      fib6_nh_init+0x3d8/0x15b0
[  675.361303][   T10]      ip6_route_info_create+0xf18/0x17d0
[  675.361303][   T10]      addrconf_f6i_alloc+0x244/0x410
[  675.361303][   T10]      ipv6_add_addr+0x411/0x2000
[  675.361303][   T10]      inet6_addr_add+0x30e/0xa40
[  675.361303][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  675.361303][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.361303][   T10]      netlink_rcv_skb+0x130/0x360
[  675.361303][   T10]      netlink_unicast+0x449/0x710
[  675.361303][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.361303][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.361303][   T10]      ___sys_sendmsg+0xee/0x170
[  675.361303][   T10]      __sys_sendmsg+0xcd/0x170
[  675.361303][   T10]      do_syscall_64+0xc6/0x1e0
[  675.361303][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.361303][   T10] 
[  675.363698][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  675.363698][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  675.363698][   T10]      ipv6_find_idev+0x102/0x170
[  675.363698][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  675.363698][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.363698][   T10]      netlink_rcv_skb+0x130/0x360
[  675.363698][   T10]      netlink_unicast+0x449/0x710
[  675.363698][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.363698][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.363698][   T10]      ___sys_sendmsg+0xee/0x170
[  675.363698][   T10]      __sys_sendmsg+0xcd/0x170
[  675.363698][   T10]      do_syscall_64+0xc6/0x1e0
[  675.363698][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.363698][   T10] 
[  675.365649][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  675.365649][   T10]      neigh_parms_alloc+0x1e5/0x510
[  675.365649][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  675.365649][   T10]      ipv6_find_idev+0x102/0x170
[  675.365649][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  675.365649][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  675.365649][   T10]      netlink_rcv_skb+0x130/0x360
[  675.365649][   T10]      netlink_unicast+0x449/0x710
[  675.365649][   T10]      netlink_sendmsg+0x723/0xbe0
[  675.365649][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  675.365649][   T10]      ___sys_sendmsg+0xee/0x170
[  675.365649][   T10]      __sys_sendmsg+0xcd/0x170
[  675.365649][   T10]      do_syscall_64+0xc6/0x1e0
[  675.365649][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  675.365649][   T10] 
[  685.419752][   T10] unregister_netdevice: waiting for ns1eth4 to become free. Usage count = 4
[  685.420135][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  685.420135][   T10]      netdev_get_by_index+0x5e/0x80
[  685.420135][   T10]      fib6_nh_init+0x3d8/0x15b0
[  685.420135][   T10]      ip6_route_info_create+0xf18/0x17d0
[  685.420135][   T10]      addrconf_f6i_alloc+0x244/0x410
[  685.420135][   T10]      ipv6_add_addr+0x411/0x2000
[  685.420135][   T10]      inet6_addr_add+0x30e/0xa40
[  685.420135][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  685.420135][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.420135][   T10]      netlink_rcv_skb+0x130/0x360
[  685.420135][   T10]      netlink_unicast+0x449/0x710
[  685.420135][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.420135][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.420135][   T10]      ___sys_sendmsg+0xee/0x170
[  685.420135][   T10]      __sys_sendmsg+0xcd/0x170
[  685.420135][   T10]      do_syscall_64+0xc6/0x1e0
[  685.420135][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.420135][   T10] 
[  685.422367][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  685.422367][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  685.422367][   T10]      ipv6_find_idev+0x102/0x170
[  685.422367][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  685.422367][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.422367][   T10]      netlink_rcv_skb+0x130/0x360
[  685.422367][   T10]      netlink_unicast+0x449/0x710
[  685.422367][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.422367][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.422367][   T10]      ___sys_sendmsg+0xee/0x170
[  685.422367][   T10]      __sys_sendmsg+0xcd/0x170
[  685.422367][   T10]      do_syscall_64+0xc6/0x1e0
[  685.422367][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.422367][   T10] 
[  685.424059][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  685.424059][   T10]      neigh_parms_alloc+0x1e5/0x510
[  685.424059][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  685.424059][   T10]      ipv6_find_idev+0x102/0x170
[  685.424059][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  685.424059][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.424059][   T10]      netlink_rcv_skb+0x130/0x360
[  685.424059][   T10]      netlink_unicast+0x449/0x710
[  685.424059][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.424059][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.424059][   T10]      ___sys_sendmsg+0xee/0x170
[  685.424059][   T10]      __sys_sendmsg+0xcd/0x170
[  685.424059][   T10]      do_syscall_64+0xc6/0x1e0
[  685.424059][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.424059][   T10] 
[  685.425913][   T10] unregister_netdevice: waiting for ns2eth4 to become free. Usage count = 4
[  685.426208][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  685.426208][   T10]      netdev_get_by_index+0x5e/0x80
[  685.426208][   T10]      fib6_nh_init+0x3d8/0x15b0
[  685.426208][   T10]      ip6_route_info_create+0xf18/0x17d0
[  685.426208][   T10]      addrconf_f6i_alloc+0x244/0x410
[  685.426208][   T10]      ipv6_add_addr+0x411/0x2000
[  685.426208][   T10]      inet6_addr_add+0x30e/0xa40
[  685.426208][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  685.426208][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.426208][   T10]      netlink_rcv_skb+0x130/0x360
[  685.426208][   T10]      netlink_unicast+0x449/0x710
[  685.426208][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.426208][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.426208][   T10]      ___sys_sendmsg+0xee/0x170
[  685.426208][   T10]      __sys_sendmsg+0xcd/0x170
[  685.426208][   T10]      do_syscall_64+0xc6/0x1e0
[  685.426208][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.426208][   T10] 
[  685.428414][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  685.428414][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  685.428414][   T10]      ipv6_find_idev+0x102/0x170
[  685.428414][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  685.428414][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.428414][   T10]      netlink_rcv_skb+0x130/0x360
[  685.428414][   T10]      netlink_unicast+0x449/0x710
[  685.428414][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.428414][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.428414][   T10]      ___sys_sendmsg+0xee/0x170
[  685.428414][   T10]      __sys_sendmsg+0xcd/0x170
[  685.428414][   T10]      do_syscall_64+0xc6/0x1e0
[  685.428414][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.428414][   T10] 
[  685.430112][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  685.430112][   T10]      neigh_parms_alloc+0x1e5/0x510
[  685.430112][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  685.430112][   T10]      ipv6_find_idev+0x102/0x170
[  685.430112][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  685.430112][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.430112][   T10]      netlink_rcv_skb+0x130/0x360
[  685.430112][   T10]      netlink_unicast+0x449/0x710
[  685.430112][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.430112][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.430112][   T10]      ___sys_sendmsg+0xee/0x170
[  685.430112][   T10]      __sys_sendmsg+0xcd/0x170
[  685.430112][   T10]      do_syscall_64+0xc6/0x1e0
[  685.430112][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.430112][   T10] 
[  685.431967][   T10] unregister_netdevice: waiting for ns1eth3 to become free. Usage count = 4
[  685.432255][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  685.432255][   T10]      netdev_get_by_index+0x5e/0x80
[  685.432255][   T10]      fib6_nh_init+0x3d8/0x15b0
[  685.432255][   T10]      ip6_route_info_create+0xf18/0x17d0
[  685.432255][   T10]      addrconf_f6i_alloc+0x244/0x410
[  685.432255][   T10]      ipv6_add_addr+0x411/0x2000
[  685.432255][   T10]      inet6_addr_add+0x30e/0xa40
[  685.432255][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  685.432255][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.432255][   T10]      netlink_rcv_skb+0x130/0x360
[  685.432255][   T10]      netlink_unicast+0x449/0x710
[  685.432255][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.432255][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.432255][   T10]      ___sys_sendmsg+0xee/0x170
[  685.432255][   T10]      __sys_sendmsg+0xcd/0x170
[  685.432255][   T10]      do_syscall_64+0xc6/0x1e0
[  685.432255][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.432255][   T10] 
[  685.434469][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  685.434469][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  685.434469][   T10]      ipv6_find_idev+0x102/0x170
[  685.434469][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  685.434469][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.434469][   T10]      netlink_rcv_skb+0x130/0x360
[  685.434469][   T10]      netlink_unicast+0x449/0x710
[  685.434469][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.434469][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.434469][   T10]      ___sys_sendmsg+0xee/0x170
[  685.434469][   T10]      __sys_sendmsg+0xcd/0x170
[  685.434469][   T10]      do_syscall_64+0xc6/0x1e0
[  685.434469][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.434469][   T10] 
[  685.436156][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  685.436156][   T10]      neigh_parms_alloc+0x1e5/0x510
[  685.436156][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  685.436156][   T10]      ipv6_find_idev+0x102/0x170
[  685.436156][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  685.436156][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.436156][   T10]      netlink_rcv_skb+0x130/0x360
[  685.436156][   T10]      netlink_unicast+0x449/0x710
[  685.436156][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.436156][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.436156][   T10]      ___sys_sendmsg+0xee/0x170
[  685.436156][   T10]      __sys_sendmsg+0xcd/0x170
[  685.436156][   T10]      do_syscall_64+0xc6/0x1e0
[  685.436156][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.436156][   T10] 
[  685.438014][   T10] unregister_netdevice: waiting for ns2eth3 to become free. Usage count = 4
[  685.438299][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  685.438299][   T10]      netdev_get_by_index+0x5e/0x80
[  685.438299][   T10]      fib6_nh_init+0x3d8/0x15b0
[  685.438299][   T10]      ip6_route_info_create+0xf18/0x17d0
[  685.438299][   T10]      addrconf_f6i_alloc+0x244/0x410
[  685.438299][   T10]      ipv6_add_addr+0x411/0x2000
[  685.438299][   T10]      inet6_addr_add+0x30e/0xa40
[  685.438299][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  685.438299][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.438299][   T10]      netlink_rcv_skb+0x130/0x360
[  685.438299][   T10]      netlink_unicast+0x449/0x710
[  685.438299][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.438299][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.438299][   T10]      ___sys_sendmsg+0xee/0x170
[  685.438299][   T10]      __sys_sendmsg+0xcd/0x170
[  685.438299][   T10]      do_syscall_64+0xc6/0x1e0
[  685.438299][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.438299][   T10] 
[  685.440689][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  685.440689][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  685.440689][   T10]      ipv6_find_idev+0x102/0x170
[  685.440689][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  685.440689][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.440689][   T10]      netlink_rcv_skb+0x130/0x360
[  685.440689][   T10]      netlink_unicast+0x449/0x710
[  685.440689][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.440689][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.440689][   T10]      ___sys_sendmsg+0xee/0x170
[  685.440689][   T10]      __sys_sendmsg+0xcd/0x170
[  685.440689][   T10]      do_syscall_64+0xc6/0x1e0
[  685.440689][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.440689][   T10] 
[  685.442566][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  685.442566][   T10]      neigh_parms_alloc+0x1e5/0x510
[  685.442566][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  685.442566][   T10]      ipv6_find_idev+0x102/0x170
[  685.442566][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  685.442566][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.442566][   T10]      netlink_rcv_skb+0x130/0x360
[  685.442566][   T10]      netlink_unicast+0x449/0x710
[  685.442566][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.442566][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.442566][   T10]      ___sys_sendmsg+0xee/0x170
[  685.442566][   T10]      __sys_sendmsg+0xcd/0x170
[  685.442566][   T10]      do_syscall_64+0xc6/0x1e0
[  685.442566][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.442566][   T10] 
[  685.445072][   T10] unregister_netdevice: waiting for ns1eth2 to become free. Usage count = 4
[  685.445368][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  685.445368][   T10]      netdev_get_by_index+0x5e/0x80
[  685.445368][   T10]      fib6_nh_init+0x3d8/0x15b0
[  685.445368][   T10]      ip6_route_info_create+0xf18/0x17d0
[  685.445368][   T10]      addrconf_f6i_alloc+0x244/0x410
[  685.445368][   T10]      ipv6_add_addr+0x411/0x2000
[  685.445368][   T10]      inet6_addr_add+0x30e/0xa40
[  685.445368][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  685.445368][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.445368][   T10]      netlink_rcv_skb+0x130/0x360
[  685.445368][   T10]      netlink_unicast+0x449/0x710
[  685.445368][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.445368][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.445368][   T10]      ___sys_sendmsg+0xee/0x170
[  685.445368][   T10]      __sys_sendmsg+0xcd/0x170
[  685.445368][   T10]      do_syscall_64+0xc6/0x1e0
[  685.445368][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.445368][   T10] 
[  685.447658][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  685.447658][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  685.447658][   T10]      ipv6_find_idev+0x102/0x170
[  685.447658][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  685.447658][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.447658][   T10]      netlink_rcv_skb+0x130/0x360
[  685.447658][   T10]      netlink_unicast+0x449/0x710
[  685.447658][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.447658][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.447658][   T10]      ___sys_sendmsg+0xee/0x170
[  685.447658][   T10]      __sys_sendmsg+0xcd/0x170
[  685.447658][   T10]      do_syscall_64+0xc6/0x1e0
[  685.447658][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.447658][   T10] 
[  685.449558][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  685.449558][   T10]      neigh_parms_alloc+0x1e5/0x510
[  685.449558][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  685.449558][   T10]      ipv6_find_idev+0x102/0x170
[  685.449558][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  685.449558][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.449558][   T10]      netlink_rcv_skb+0x130/0x360
[  685.449558][   T10]      netlink_unicast+0x449/0x710
[  685.449558][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.449558][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.449558][   T10]      ___sys_sendmsg+0xee/0x170
[  685.449558][   T10]      __sys_sendmsg+0xcd/0x170
[  685.449558][   T10]      do_syscall_64+0xc6/0x1e0
[  685.449558][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.449558][   T10] 
[  685.451703][   T10] unregister_netdevice: waiting for ns2eth2 to become free. Usage count = 4
[  685.452006][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  685.452006][   T10]      netdev_get_by_index+0x5e/0x80
[  685.452006][   T10]      fib6_nh_init+0x3d8/0x15b0
[  685.452006][   T10]      ip6_route_info_create+0xf18/0x17d0
[  685.452006][   T10]      addrconf_f6i_alloc+0x244/0x410
[  685.452006][   T10]      ipv6_add_addr+0x411/0x2000
[  685.452006][   T10]      inet6_addr_add+0x30e/0xa40
[  685.452006][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  685.452006][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.452006][   T10]      netlink_rcv_skb+0x130/0x360
[  685.452006][   T10]      netlink_unicast+0x449/0x710
[  685.452006][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.452006][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.452006][   T10]      ___sys_sendmsg+0xee/0x170
[  685.452006][   T10]      __sys_sendmsg+0xcd/0x170
[  685.452006][   T10]      do_syscall_64+0xc6/0x1e0
[  685.452006][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.452006][   T10] 
[  685.454545][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  685.454545][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  685.454545][   T10]      ipv6_find_idev+0x102/0x170
[  685.454545][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  685.454545][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.454545][   T10]      netlink_rcv_skb+0x130/0x360
[  685.454545][   T10]      netlink_unicast+0x449/0x710
[  685.454545][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.454545][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.454545][   T10]      ___sys_sendmsg+0xee/0x170
[  685.454545][   T10]      __sys_sendmsg+0xcd/0x170
[  685.454545][   T10]      do_syscall_64+0xc6/0x1e0
[  685.454545][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.454545][   T10] 
[  685.456466][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  685.456466][   T10]      neigh_parms_alloc+0x1e5/0x510
[  685.456466][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  685.456466][   T10]      ipv6_find_idev+0x102/0x170
[  685.456466][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  685.456466][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.456466][   T10]      netlink_rcv_skb+0x130/0x360
[  685.456466][   T10]      netlink_unicast+0x449/0x710
[  685.456466][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.456466][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.456466][   T10]      ___sys_sendmsg+0xee/0x170
[  685.456466][   T10]      __sys_sendmsg+0xcd/0x170
[  685.456466][   T10]      do_syscall_64+0xc6/0x1e0
[  685.456466][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.456466][   T10] 
[  685.458701][   T10] unregister_netdevice: waiting for ns1eth1 to become free. Usage count = 4
[  685.459000][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  685.459000][   T10]      netdev_get_by_index+0x5e/0x80
[  685.459000][   T10]      fib6_nh_init+0x3d8/0x15b0
[  685.459000][   T10]      ip6_route_info_create+0xf18/0x17d0
[  685.459000][   T10]      addrconf_f6i_alloc+0x244/0x410
[  685.459000][   T10]      ipv6_add_addr+0x411/0x2000
[  685.459000][   T10]      inet6_addr_add+0x30e/0xa40
[  685.459000][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  685.459000][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.459000][   T10]      netlink_rcv_skb+0x130/0x360
[  685.459000][   T10]      netlink_unicast+0x449/0x710
[  685.459000][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.459000][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.459000][   T10]      ___sys_sendmsg+0xee/0x170
[  685.459000][   T10]      __sys_sendmsg+0xcd/0x170
[  685.459000][   T10]      do_syscall_64+0xc6/0x1e0
[  685.459000][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.459000][   T10] 
[  685.461471][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  685.461471][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  685.461471][   T10]      ipv6_find_idev+0x102/0x170
[  685.461471][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  685.461471][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.461471][   T10]      netlink_rcv_skb+0x130/0x360
[  685.461471][   T10]      netlink_unicast+0x449/0x710
[  685.461471][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.461471][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.461471][   T10]      ___sys_sendmsg+0xee/0x170
[  685.461471][   T10]      __sys_sendmsg+0xcd/0x170
[  685.461471][   T10]      do_syscall_64+0xc6/0x1e0
[  685.461471][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.461471][   T10] 
[  685.463401][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  685.463401][   T10]      neigh_parms_alloc+0x1e5/0x510
[  685.463401][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  685.463401][   T10]      ipv6_find_idev+0x102/0x170
[  685.463401][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  685.463401][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.463401][   T10]      netlink_rcv_skb+0x130/0x360
[  685.463401][   T10]      netlink_unicast+0x449/0x710
[  685.463401][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.463401][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.463401][   T10]      ___sys_sendmsg+0xee/0x170
[  685.463401][   T10]      __sys_sendmsg+0xcd/0x170
[  685.463401][   T10]      do_syscall_64+0xc6/0x1e0
[  685.463401][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.463401][   T10] 
[  685.465688][   T10] unregister_netdevice: waiting for ns2eth1 to become free. Usage count = 4
[  685.465987][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  685.465987][   T10]      netdev_get_by_index+0x5e/0x80
[  685.465987][   T10]      fib6_nh_init+0x3d8/0x15b0
[  685.465987][   T10]      ip6_route_info_create+0xf18/0x17d0
[  685.465987][   T10]      addrconf_f6i_alloc+0x244/0x410
[  685.465987][   T10]      ipv6_add_addr+0x411/0x2000
[  685.465987][   T10]      inet6_addr_add+0x30e/0xa40
[  685.465987][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  685.465987][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.465987][   T10]      netlink_rcv_skb+0x130/0x360
[  685.465987][   T10]      netlink_unicast+0x449/0x710
[  685.465987][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.465987][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.465987][   T10]      ___sys_sendmsg+0xee/0x170
[  685.465987][   T10]      __sys_sendmsg+0xcd/0x170
[  685.465987][   T10]      do_syscall_64+0xc6/0x1e0
[  685.465987][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.465987][   T10] 
[  685.468442][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  685.468442][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  685.468442][   T10]      ipv6_find_idev+0x102/0x170
[  685.468442][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  685.468442][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.468442][   T10]      netlink_rcv_skb+0x130/0x360
[  685.468442][   T10]      netlink_unicast+0x449/0x710
[  685.468442][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.468442][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.468442][   T10]      ___sys_sendmsg+0xee/0x170
[  685.468442][   T10]      __sys_sendmsg+0xcd/0x170
[  685.468442][   T10]      do_syscall_64+0xc6/0x1e0
[  685.468442][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.468442][   T10] 
[  685.470381][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  685.470381][   T10]      neigh_parms_alloc+0x1e5/0x510
[  685.470381][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  685.470381][   T10]      ipv6_find_idev+0x102/0x170
[  685.470381][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  685.470381][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  685.470381][   T10]      netlink_rcv_skb+0x130/0x360
[  685.470381][   T10]      netlink_unicast+0x449/0x710
[  685.470381][   T10]      netlink_sendmsg+0x723/0xbe0
[  685.470381][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  685.470381][   T10]      ___sys_sendmsg+0xee/0x170
[  685.470381][   T10]      __sys_sendmsg+0xcd/0x170
[  685.470381][   T10]      do_syscall_64+0xc6/0x1e0
[  685.470381][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  685.470381][   T10] 
[  695.707835][   T10] unregister_netdevice: waiting for ns1eth4 to become free. Usage count = 4
[  695.708207][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  695.708207][   T10]      netdev_get_by_index+0x5e/0x80
[  695.708207][   T10]      fib6_nh_init+0x3d8/0x15b0
[  695.708207][   T10]      ip6_route_info_create+0xf18/0x17d0
[  695.708207][   T10]      addrconf_f6i_alloc+0x244/0x410
[  695.708207][   T10]      ipv6_add_addr+0x411/0x2000
[  695.708207][   T10]      inet6_addr_add+0x30e/0xa40
[  695.708207][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  695.708207][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.708207][   T10]      netlink_rcv_skb+0x130/0x360
[  695.708207][   T10]      netlink_unicast+0x449/0x710
[  695.708207][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.708207][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.708207][   T10]      ___sys_sendmsg+0xee/0x170
[  695.708207][   T10]      __sys_sendmsg+0xcd/0x170
[  695.708207][   T10]      do_syscall_64+0xc6/0x1e0
[  695.708207][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.708207][   T10] 
[  695.710432][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  695.710432][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  695.710432][   T10]      ipv6_find_idev+0x102/0x170
[  695.710432][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  695.710432][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.710432][   T10]      netlink_rcv_skb+0x130/0x360
[  695.710432][   T10]      netlink_unicast+0x449/0x710
[  695.710432][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.710432][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.710432][   T10]      ___sys_sendmsg+0xee/0x170
[  695.710432][   T10]      __sys_sendmsg+0xcd/0x170
[  695.710432][   T10]      do_syscall_64+0xc6/0x1e0
[  695.710432][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.710432][   T10] 
[  695.712143][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  695.712143][   T10]      neigh_parms_alloc+0x1e5/0x510
[  695.712143][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  695.712143][   T10]      ipv6_find_idev+0x102/0x170
[  695.712143][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  695.712143][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.712143][   T10]      netlink_rcv_skb+0x130/0x360
[  695.712143][   T10]      netlink_unicast+0x449/0x710
[  695.712143][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.712143][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.712143][   T10]      ___sys_sendmsg+0xee/0x170
[  695.712143][   T10]      __sys_sendmsg+0xcd/0x170
[  695.712143][   T10]      do_syscall_64+0xc6/0x1e0
[  695.712143][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.712143][   T10] 
[  695.714006][   T10] unregister_netdevice: waiting for ns2eth4 to become free. Usage count = 4
[  695.714295][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  695.714295][   T10]      netdev_get_by_index+0x5e/0x80
[  695.714295][   T10]      fib6_nh_init+0x3d8/0x15b0
[  695.714295][   T10]      ip6_route_info_create+0xf18/0x17d0
[  695.714295][   T10]      addrconf_f6i_alloc+0x244/0x410
[  695.714295][   T10]      ipv6_add_addr+0x411/0x2000
[  695.714295][   T10]      inet6_addr_add+0x30e/0xa40
[  695.714295][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  695.714295][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.714295][   T10]      netlink_rcv_skb+0x130/0x360
[  695.714295][   T10]      netlink_unicast+0x449/0x710
[  695.714295][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.714295][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.714295][   T10]      ___sys_sendmsg+0xee/0x170
[  695.714295][   T10]      __sys_sendmsg+0xcd/0x170
[  695.714295][   T10]      do_syscall_64+0xc6/0x1e0
[  695.714295][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.714295][   T10] 
[  695.716497][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  695.716497][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  695.716497][   T10]      ipv6_find_idev+0x102/0x170
[  695.716497][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  695.716497][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.716497][   T10]      netlink_rcv_skb+0x130/0x360
[  695.716497][   T10]      netlink_unicast+0x449/0x710
[  695.716497][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.716497][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.716497][   T10]      ___sys_sendmsg+0xee/0x170
[  695.716497][   T10]      __sys_sendmsg+0xcd/0x170
[  695.716497][   T10]      do_syscall_64+0xc6/0x1e0
[  695.716497][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.716497][   T10] 
[  695.718188][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  695.718188][   T10]      neigh_parms_alloc+0x1e5/0x510
[  695.718188][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  695.718188][   T10]      ipv6_find_idev+0x102/0x170
[  695.718188][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  695.718188][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.718188][   T10]      netlink_rcv_skb+0x130/0x360
[  695.718188][   T10]      netlink_unicast+0x449/0x710
[  695.718188][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.718188][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.718188][   T10]      ___sys_sendmsg+0xee/0x170
[  695.718188][   T10]      __sys_sendmsg+0xcd/0x170
[  695.718188][   T10]      do_syscall_64+0xc6/0x1e0
[  695.718188][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.718188][   T10] 
[  695.720033][   T10] unregister_netdevice: waiting for ns1eth3 to become free. Usage count = 4
[  695.720315][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  695.720315][   T10]      netdev_get_by_index+0x5e/0x80
[  695.720315][   T10]      fib6_nh_init+0x3d8/0x15b0
[  695.720315][   T10]      ip6_route_info_create+0xf18/0x17d0
[  695.720315][   T10]      addrconf_f6i_alloc+0x244/0x410
[  695.720315][   T10]      ipv6_add_addr+0x411/0x2000
[  695.720315][   T10]      inet6_addr_add+0x30e/0xa40
[  695.720315][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  695.720315][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.720315][   T10]      netlink_rcv_skb+0x130/0x360
[  695.720315][   T10]      netlink_unicast+0x449/0x710
[  695.720315][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.720315][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.720315][   T10]      ___sys_sendmsg+0xee/0x170
[  695.720315][   T10]      __sys_sendmsg+0xcd/0x170
[  695.720315][   T10]      do_syscall_64+0xc6/0x1e0
[  695.720315][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.720315][   T10] 
[  695.722507][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  695.722507][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  695.722507][   T10]      ipv6_find_idev+0x102/0x170
[  695.722507][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  695.722507][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.722507][   T10]      netlink_rcv_skb+0x130/0x360
[  695.722507][   T10]      netlink_unicast+0x449/0x710
[  695.722507][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.722507][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.722507][   T10]      ___sys_sendmsg+0xee/0x170
[  695.722507][   T10]      __sys_sendmsg+0xcd/0x170
[  695.722507][   T10]      do_syscall_64+0xc6/0x1e0
[  695.722507][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.722507][   T10] 
[  695.724214][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  695.724214][   T10]      neigh_parms_alloc+0x1e5/0x510
[  695.724214][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  695.724214][   T10]      ipv6_find_idev+0x102/0x170
[  695.724214][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  695.724214][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.724214][   T10]      netlink_rcv_skb+0x130/0x360
[  695.724214][   T10]      netlink_unicast+0x449/0x710
[  695.724214][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.724214][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.724214][   T10]      ___sys_sendmsg+0xee/0x170
[  695.724214][   T10]      __sys_sendmsg+0xcd/0x170
[  695.724214][   T10]      do_syscall_64+0xc6/0x1e0
[  695.724214][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.724214][   T10] 
[  695.726060][   T10] unregister_netdevice: waiting for ns2eth3 to become free. Usage count = 4
[  695.726349][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  695.726349][   T10]      netdev_get_by_index+0x5e/0x80
[  695.726349][   T10]      fib6_nh_init+0x3d8/0x15b0
[  695.726349][   T10]      ip6_route_info_create+0xf18/0x17d0
[  695.726349][   T10]      addrconf_f6i_alloc+0x244/0x410
[  695.726349][   T10]      ipv6_add_addr+0x411/0x2000
[  695.726349][   T10]      inet6_addr_add+0x30e/0xa40
[  695.726349][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  695.726349][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.726349][   T10]      netlink_rcv_skb+0x130/0x360
[  695.726349][   T10]      netlink_unicast+0x449/0x710
[  695.726349][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.726349][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.726349][   T10]      ___sys_sendmsg+0xee/0x170
[  695.726349][   T10]      __sys_sendmsg+0xcd/0x170
[  695.726349][   T10]      do_syscall_64+0xc6/0x1e0
[  695.726349][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.726349][   T10] 
[  695.728570][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  695.728570][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  695.728570][   T10]      ipv6_find_idev+0x102/0x170
[  695.728570][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  695.728570][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.728570][   T10]      netlink_rcv_skb+0x130/0x360
[  695.728570][   T10]      netlink_unicast+0x449/0x710
[  695.728570][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.728570][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.728570][   T10]      ___sys_sendmsg+0xee/0x170
[  695.728570][   T10]      __sys_sendmsg+0xcd/0x170
[  695.728570][   T10]      do_syscall_64+0xc6/0x1e0
[  695.728570][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.728570][   T10] 
[  695.730276][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  695.730276][   T10]      neigh_parms_alloc+0x1e5/0x510
[  695.730276][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  695.730276][   T10]      ipv6_find_idev+0x102/0x170
[  695.730276][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  695.730276][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.730276][   T10]      netlink_rcv_skb+0x130/0x360
[  695.730276][   T10]      netlink_unicast+0x449/0x710
[  695.730276][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.730276][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.730276][   T10]      ___sys_sendmsg+0xee/0x170
[  695.730276][   T10]      __sys_sendmsg+0xcd/0x170
[  695.730276][   T10]      do_syscall_64+0xc6/0x1e0
[  695.730276][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.730276][   T10] 
[  695.732578][   T10] unregister_netdevice: waiting for ns1eth2 to become free. Usage count = 4
[  695.732963][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  695.732963][   T10]      netdev_get_by_index+0x5e/0x80
[  695.732963][   T10]      fib6_nh_init+0x3d8/0x15b0
[  695.732963][   T10]      ip6_route_info_create+0xf18/0x17d0
[  695.732963][   T10]      addrconf_f6i_alloc+0x244/0x410
[  695.732963][   T10]      ipv6_add_addr+0x411/0x2000
[  695.732963][   T10]      inet6_addr_add+0x30e/0xa40
[  695.732963][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  695.732963][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.732963][   T10]      netlink_rcv_skb+0x130/0x360
[  695.732963][   T10]      netlink_unicast+0x449/0x710
[  695.732963][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.732963][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.732963][   T10]      ___sys_sendmsg+0xee/0x170
[  695.732963][   T10]      __sys_sendmsg+0xcd/0x170
[  695.732963][   T10]      do_syscall_64+0xc6/0x1e0
[  695.732963][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.732963][   T10] 
[  695.735159][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  695.735159][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  695.735159][   T10]      ipv6_find_idev+0x102/0x170
[  695.735159][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  695.735159][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.735159][   T10]      netlink_rcv_skb+0x130/0x360
[  695.735159][   T10]      netlink_unicast+0x449/0x710
[  695.735159][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.735159][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.735159][   T10]      ___sys_sendmsg+0xee/0x170
[  695.735159][   T10]      __sys_sendmsg+0xcd/0x170
[  695.735159][   T10]      do_syscall_64+0xc6/0x1e0
[  695.735159][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.735159][   T10] 
[  695.736858][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  695.736858][   T10]      neigh_parms_alloc+0x1e5/0x510
[  695.736858][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  695.736858][   T10]      ipv6_find_idev+0x102/0x170
[  695.736858][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  695.736858][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.736858][   T10]      netlink_rcv_skb+0x130/0x360
[  695.736858][   T10]      netlink_unicast+0x449/0x710
[  695.736858][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.736858][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.736858][   T10]      ___sys_sendmsg+0xee/0x170
[  695.736858][   T10]      __sys_sendmsg+0xcd/0x170
[  695.736858][   T10]      do_syscall_64+0xc6/0x1e0
[  695.736858][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.736858][   T10] 
[  695.738986][   T10] unregister_netdevice: waiting for ns2eth2 to become free. Usage count = 4
[  695.739272][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  695.739272][   T10]      netdev_get_by_index+0x5e/0x80
[  695.739272][   T10]      fib6_nh_init+0x3d8/0x15b0
[  695.739272][   T10]      ip6_route_info_create+0xf18/0x17d0
[  695.739272][   T10]      addrconf_f6i_alloc+0x244/0x410
[  695.739272][   T10]      ipv6_add_addr+0x411/0x2000
[  695.739272][   T10]      inet6_addr_add+0x30e/0xa40
[  695.739272][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  695.739272][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.739272][   T10]      netlink_rcv_skb+0x130/0x360
[  695.739272][   T10]      netlink_unicast+0x449/0x710
[  695.739272][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.739272][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.739272][   T10]      ___sys_sendmsg+0xee/0x170
[  695.739272][   T10]      __sys_sendmsg+0xcd/0x170
[  695.739272][   T10]      do_syscall_64+0xc6/0x1e0
[  695.739272][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.739272][   T10] 
[  695.741664][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  695.741664][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  695.741664][   T10]      ipv6_find_idev+0x102/0x170
[  695.741664][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  695.741664][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.741664][   T10]      netlink_rcv_skb+0x130/0x360
[  695.741664][   T10]      netlink_unicast+0x449/0x710
[  695.741664][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.741664][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.741664][   T10]      ___sys_sendmsg+0xee/0x170
[  695.741664][   T10]      __sys_sendmsg+0xcd/0x170
[  695.741664][   T10]      do_syscall_64+0xc6/0x1e0
[  695.741664][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.741664][   T10] 
[  695.743541][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  695.743541][   T10]      neigh_parms_alloc+0x1e5/0x510
[  695.743541][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  695.743541][   T10]      ipv6_find_idev+0x102/0x170
[  695.743541][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  695.743541][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.743541][   T10]      netlink_rcv_skb+0x130/0x360
[  695.743541][   T10]      netlink_unicast+0x449/0x710
[  695.743541][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.743541][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.743541][   T10]      ___sys_sendmsg+0xee/0x170
[  695.743541][   T10]      __sys_sendmsg+0xcd/0x170
[  695.743541][   T10]      do_syscall_64+0xc6/0x1e0
[  695.743541][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.743541][   T10] 
[  695.745618][   T10] unregister_netdevice: waiting for ns1eth1 to become free. Usage count = 4
[  695.745955][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  695.745955][   T10]      netdev_get_by_index+0x5e/0x80
[  695.745955][   T10]      fib6_nh_init+0x3d8/0x15b0
[  695.745955][   T10]      ip6_route_info_create+0xf18/0x17d0
[  695.745955][   T10]      addrconf_f6i_alloc+0x244/0x410
[  695.745955][   T10]      ipv6_add_addr+0x411/0x2000
[  695.745955][   T10]      inet6_addr_add+0x30e/0xa40
[  695.745955][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  695.745955][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.745955][   T10]      netlink_rcv_skb+0x130/0x360
[  695.745955][   T10]      netlink_unicast+0x449/0x710
[  695.745955][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.745955][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.745955][   T10]      ___sys_sendmsg+0xee/0x170
[  695.745955][   T10]      __sys_sendmsg+0xcd/0x170
[  695.745955][   T10]      do_syscall_64+0xc6/0x1e0
[  695.745955][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.745955][   T10] 
[  695.748336][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  695.748336][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  695.748336][   T10]      ipv6_find_idev+0x102/0x170
[  695.748336][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  695.748336][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.748336][   T10]      netlink_rcv_skb+0x130/0x360
[  695.748336][   T10]      netlink_unicast+0x449/0x710
[  695.748336][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.748336][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.748336][   T10]      ___sys_sendmsg+0xee/0x170
[  695.748336][   T10]      __sys_sendmsg+0xcd/0x170
[  695.748336][   T10]      do_syscall_64+0xc6/0x1e0
[  695.748336][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.748336][   T10] 
[  695.750288][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  695.750288][   T10]      neigh_parms_alloc+0x1e5/0x510
[  695.750288][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  695.750288][   T10]      ipv6_find_idev+0x102/0x170
[  695.750288][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  695.750288][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.750288][   T10]      netlink_rcv_skb+0x130/0x360
[  695.750288][   T10]      netlink_unicast+0x449/0x710
[  695.750288][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.750288][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.750288][   T10]      ___sys_sendmsg+0xee/0x170
[  695.750288][   T10]      __sys_sendmsg+0xcd/0x170
[  695.750288][   T10]      do_syscall_64+0xc6/0x1e0
[  695.750288][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.750288][   T10] 
[  695.752362][   T10] unregister_netdevice: waiting for ns2eth1 to become free. Usage count = 4
[  695.752648][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  695.752648][   T10]      netdev_get_by_index+0x5e/0x80
[  695.752648][   T10]      fib6_nh_init+0x3d8/0x15b0
[  695.752648][   T10]      ip6_route_info_create+0xf18/0x17d0
[  695.752648][   T10]      addrconf_f6i_alloc+0x244/0x410
[  695.752648][   T10]      ipv6_add_addr+0x411/0x2000
[  695.752648][   T10]      inet6_addr_add+0x30e/0xa40
[  695.752648][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  695.752648][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.752648][   T10]      netlink_rcv_skb+0x130/0x360
[  695.752648][   T10]      netlink_unicast+0x449/0x710
[  695.752648][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.752648][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.752648][   T10]      ___sys_sendmsg+0xee/0x170
[  695.752648][   T10]      __sys_sendmsg+0xcd/0x170
[  695.752648][   T10]      do_syscall_64+0xc6/0x1e0
[  695.752648][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.752648][   T10] 
[  695.755033][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  695.755033][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  695.755033][   T10]      ipv6_find_idev+0x102/0x170
[  695.755033][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  695.755033][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.755033][   T10]      netlink_rcv_skb+0x130/0x360
[  695.755033][   T10]      netlink_unicast+0x449/0x710
[  695.755033][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.755033][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.755033][   T10]      ___sys_sendmsg+0xee/0x170
[  695.755033][   T10]      __sys_sendmsg+0xcd/0x170
[  695.755033][   T10]      do_syscall_64+0xc6/0x1e0
[  695.755033][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.755033][   T10] 
[  695.756914][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  695.756914][   T10]      neigh_parms_alloc+0x1e5/0x510
[  695.756914][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  695.756914][   T10]      ipv6_find_idev+0x102/0x170
[  695.756914][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  695.756914][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  695.756914][   T10]      netlink_rcv_skb+0x130/0x360
[  695.756914][   T10]      netlink_unicast+0x449/0x710
[  695.756914][   T10]      netlink_sendmsg+0x723/0xbe0
[  695.756914][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  695.756914][   T10]      ___sys_sendmsg+0xee/0x170
[  695.756914][   T10]      __sys_sendmsg+0xcd/0x170
[  695.756914][   T10]      do_syscall_64+0xc6/0x1e0
[  695.756914][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  695.756914][   T10] 
[  705.995666][   T10] unregister_netdevice: waiting for ns1eth4 to become free. Usage count = 4
[  705.996104][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  705.996104][   T10]      netdev_get_by_index+0x5e/0x80
[  705.996104][   T10]      fib6_nh_init+0x3d8/0x15b0
[  705.996104][   T10]      ip6_route_info_create+0xf18/0x17d0
[  705.996104][   T10]      addrconf_f6i_alloc+0x244/0x410
[  705.996104][   T10]      ipv6_add_addr+0x411/0x2000
[  705.996104][   T10]      inet6_addr_add+0x30e/0xa40
[  705.996104][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  705.996104][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  705.996104][   T10]      netlink_rcv_skb+0x130/0x360
[  705.996104][   T10]      netlink_unicast+0x449/0x710
[  705.996104][   T10]      netlink_sendmsg+0x723/0xbe0
[  705.996104][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  705.996104][   T10]      ___sys_sendmsg+0xee/0x170
[  705.996104][   T10]      __sys_sendmsg+0xcd/0x170
[  705.996104][   T10]      do_syscall_64+0xc6/0x1e0
[  705.996104][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  705.996104][   T10] 
[  705.998339][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  705.998339][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  705.998339][   T10]      ipv6_find_idev+0x102/0x170
[  705.998339][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  705.998339][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  705.998339][   T10]      netlink_rcv_skb+0x130/0x360
[  705.998339][   T10]      netlink_unicast+0x449/0x710
[  705.998339][   T10]      netlink_sendmsg+0x723/0xbe0
[  705.998339][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  705.998339][   T10]      ___sys_sendmsg+0xee/0x170
[  705.998339][   T10]      __sys_sendmsg+0xcd/0x170
[  705.998339][   T10]      do_syscall_64+0xc6/0x1e0
[  705.998339][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  705.998339][   T10] 
[  706.000030][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  706.000030][   T10]      neigh_parms_alloc+0x1e5/0x510
[  706.000030][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  706.000030][   T10]      ipv6_find_idev+0x102/0x170
[  706.000030][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  706.000030][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.000030][   T10]      netlink_rcv_skb+0x130/0x360
[  706.000030][   T10]      netlink_unicast+0x449/0x710
[  706.000030][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.000030][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.000030][   T10]      ___sys_sendmsg+0xee/0x170
[  706.000030][   T10]      __sys_sendmsg+0xcd/0x170
[  706.000030][   T10]      do_syscall_64+0xc6/0x1e0
[  706.000030][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.000030][   T10] 
[  706.001926][   T10] unregister_netdevice: waiting for ns2eth4 to become free. Usage count = 4
[  706.002223][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  706.002223][   T10]      netdev_get_by_index+0x5e/0x80
[  706.002223][   T10]      fib6_nh_init+0x3d8/0x15b0
[  706.002223][   T10]      ip6_route_info_create+0xf18/0x17d0
[  706.002223][   T10]      addrconf_f6i_alloc+0x244/0x410
[  706.002223][   T10]      ipv6_add_addr+0x411/0x2000
[  706.002223][   T10]      inet6_addr_add+0x30e/0xa40
[  706.002223][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  706.002223][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.002223][   T10]      netlink_rcv_skb+0x130/0x360
[  706.002223][   T10]      netlink_unicast+0x449/0x710
[  706.002223][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.002223][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.002223][   T10]      ___sys_sendmsg+0xee/0x170
[  706.002223][   T10]      __sys_sendmsg+0xcd/0x170
[  706.002223][   T10]      do_syscall_64+0xc6/0x1e0
[  706.002223][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.002223][   T10] 
[  706.004406][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  706.004406][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  706.004406][   T10]      ipv6_find_idev+0x102/0x170
[  706.004406][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  706.004406][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.004406][   T10]      netlink_rcv_skb+0x130/0x360
[  706.004406][   T10]      netlink_unicast+0x449/0x710
[  706.004406][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.004406][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.004406][   T10]      ___sys_sendmsg+0xee/0x170
[  706.004406][   T10]      __sys_sendmsg+0xcd/0x170
[  706.004406][   T10]      do_syscall_64+0xc6/0x1e0
[  706.004406][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.004406][   T10] 
[  706.006127][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  706.006127][   T10]      neigh_parms_alloc+0x1e5/0x510
[  706.006127][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  706.006127][   T10]      ipv6_find_idev+0x102/0x170
[  706.006127][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  706.006127][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.006127][   T10]      netlink_rcv_skb+0x130/0x360
[  706.006127][   T10]      netlink_unicast+0x449/0x710
[  706.006127][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.006127][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.006127][   T10]      ___sys_sendmsg+0xee/0x170
[  706.006127][   T10]      __sys_sendmsg+0xcd/0x170
[  706.006127][   T10]      do_syscall_64+0xc6/0x1e0
[  706.006127][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.006127][   T10] 
[  706.007999][   T10] unregister_netdevice: waiting for ns1eth3 to become free. Usage count = 4
[  706.008284][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  706.008284][   T10]      netdev_get_by_index+0x5e/0x80
[  706.008284][   T10]      fib6_nh_init+0x3d8/0x15b0
[  706.008284][   T10]      ip6_route_info_create+0xf18/0x17d0
[  706.008284][   T10]      addrconf_f6i_alloc+0x244/0x410
[  706.008284][   T10]      ipv6_add_addr+0x411/0x2000
[  706.008284][   T10]      inet6_addr_add+0x30e/0xa40
[  706.008284][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  706.008284][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.008284][   T10]      netlink_rcv_skb+0x130/0x360
[  706.008284][   T10]      netlink_unicast+0x449/0x710
[  706.008284][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.008284][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.008284][   T10]      ___sys_sendmsg+0xee/0x170
[  706.008284][   T10]      __sys_sendmsg+0xcd/0x170
[  706.008284][   T10]      do_syscall_64+0xc6/0x1e0
[  706.008284][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.008284][   T10] 
[  706.010564][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  706.010564][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  706.010564][   T10]      ipv6_find_idev+0x102/0x170
[  706.010564][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  706.010564][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.010564][   T10]      netlink_rcv_skb+0x130/0x360
[  706.010564][   T10]      netlink_unicast+0x449/0x710
[  706.010564][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.010564][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.010564][   T10]      ___sys_sendmsg+0xee/0x170
[  706.010564][   T10]      __sys_sendmsg+0xcd/0x170
[  706.010564][   T10]      do_syscall_64+0xc6/0x1e0
[  706.010564][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.010564][   T10] 
[  706.012439][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  706.012439][   T10]      neigh_parms_alloc+0x1e5/0x510
[  706.012439][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  706.012439][   T10]      ipv6_find_idev+0x102/0x170
[  706.012439][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  706.012439][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.012439][   T10]      netlink_rcv_skb+0x130/0x360
[  706.012439][   T10]      netlink_unicast+0x449/0x710
[  706.012439][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.012439][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.012439][   T10]      ___sys_sendmsg+0xee/0x170
[  706.012439][   T10]      __sys_sendmsg+0xcd/0x170
[  706.012439][   T10]      do_syscall_64+0xc6/0x1e0
[  706.012439][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.012439][   T10] 
[  706.014525][   T10] unregister_netdevice: waiting for ns2eth3 to become free. Usage count = 4
[  706.014830][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  706.014830][   T10]      netdev_get_by_index+0x5e/0x80
[  706.014830][   T10]      fib6_nh_init+0x3d8/0x15b0
[  706.014830][   T10]      ip6_route_info_create+0xf18/0x17d0
[  706.014830][   T10]      addrconf_f6i_alloc+0x244/0x410
[  706.014830][   T10]      ipv6_add_addr+0x411/0x2000
[  706.014830][   T10]      inet6_addr_add+0x30e/0xa40
[  706.014830][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  706.014830][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.014830][   T10]      netlink_rcv_skb+0x130/0x360
[  706.014830][   T10]      netlink_unicast+0x449/0x710
[  706.014830][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.014830][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.014830][   T10]      ___sys_sendmsg+0xee/0x170
[  706.014830][   T10]      __sys_sendmsg+0xcd/0x170
[  706.014830][   T10]      do_syscall_64+0xc6/0x1e0
[  706.014830][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.014830][   T10] 
[  706.017264][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  706.017264][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  706.017264][   T10]      ipv6_find_idev+0x102/0x170
[  706.017264][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  706.017264][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.017264][   T10]      netlink_rcv_skb+0x130/0x360
[  706.017264][   T10]      netlink_unicast+0x449/0x710
[  706.017264][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.017264][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.017264][   T10]      ___sys_sendmsg+0xee/0x170
[  706.017264][   T10]      __sys_sendmsg+0xcd/0x170
[  706.017264][   T10]      do_syscall_64+0xc6/0x1e0
[  706.017264][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.017264][   T10] 
[  706.019080][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  706.019080][   T10]      neigh_parms_alloc+0x1e5/0x510
[  706.019080][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  706.019080][   T10]      ipv6_find_idev+0x102/0x170
[  706.019080][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  706.019080][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.019080][   T10]      netlink_rcv_skb+0x130/0x360
[  706.019080][   T10]      netlink_unicast+0x449/0x710
[  706.019080][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.019080][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.019080][   T10]      ___sys_sendmsg+0xee/0x170
[  706.019080][   T10]      __sys_sendmsg+0xcd/0x170
[  706.019080][   T10]      do_syscall_64+0xc6/0x1e0
[  706.019080][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.019080][   T10] 
[  706.021118][   T10] unregister_netdevice: waiting for ns1eth2 to become free. Usage count = 4
[  706.021466][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  706.021466][   T10]      netdev_get_by_index+0x5e/0x80
[  706.021466][   T10]      fib6_nh_init+0x3d8/0x15b0
[  706.021466][   T10]      ip6_route_info_create+0xf18/0x17d0
[  706.021466][   T10]      addrconf_f6i_alloc+0x244/0x410
[  706.021466][   T10]      ipv6_add_addr+0x411/0x2000
[  706.021466][   T10]      inet6_addr_add+0x30e/0xa40
[  706.021466][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  706.021466][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.021466][   T10]      netlink_rcv_skb+0x130/0x360
[  706.021466][   T10]      netlink_unicast+0x449/0x710
[  706.021466][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.021466][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.021466][   T10]      ___sys_sendmsg+0xee/0x170
[  706.021466][   T10]      __sys_sendmsg+0xcd/0x170
[  706.021466][   T10]      do_syscall_64+0xc6/0x1e0
[  706.021466][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.021466][   T10] 
[  706.023657][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  706.023657][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  706.023657][   T10]      ipv6_find_idev+0x102/0x170
[  706.023657][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  706.023657][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.023657][   T10]      netlink_rcv_skb+0x130/0x360
[  706.023657][   T10]      netlink_unicast+0x449/0x710
[  706.023657][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.023657][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.023657][   T10]      ___sys_sendmsg+0xee/0x170
[  706.023657][   T10]      __sys_sendmsg+0xcd/0x170
[  706.023657][   T10]      do_syscall_64+0xc6/0x1e0
[  706.023657][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.023657][   T10] 
[  706.025351][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  706.025351][   T10]      neigh_parms_alloc+0x1e5/0x510
[  706.025351][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  706.025351][   T10]      ipv6_find_idev+0x102/0x170
[  706.025351][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  706.025351][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.025351][   T10]      netlink_rcv_skb+0x130/0x360
[  706.025351][   T10]      netlink_unicast+0x449/0x710
[  706.025351][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.025351][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.025351][   T10]      ___sys_sendmsg+0xee/0x170
[  706.025351][   T10]      __sys_sendmsg+0xcd/0x170
[  706.025351][   T10]      do_syscall_64+0xc6/0x1e0
[  706.025351][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.025351][   T10] 
[  706.027633][   T10] unregister_netdevice: waiting for ns2eth2 to become free. Usage count = 4
[  706.028899][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  706.028899][   T10]      netdev_get_by_index+0x5e/0x80
[  706.028899][   T10]      fib6_nh_init+0x3d8/0x15b0
[  706.028899][   T10]      ip6_route_info_create+0xf18/0x17d0
[  706.028899][   T10]      addrconf_f6i_alloc+0x244/0x410
[  706.028899][   T10]      ipv6_add_addr+0x411/0x2000
[  706.028899][   T10]      inet6_addr_add+0x30e/0xa40
[  706.028899][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  706.028899][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.028899][   T10]      netlink_rcv_skb+0x130/0x360
[  706.028899][   T10]      netlink_unicast+0x449/0x710
[  706.028899][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.028899][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.028899][   T10]      ___sys_sendmsg+0xee/0x170
[  706.028899][   T10]      __sys_sendmsg+0xcd/0x170
[  706.028899][   T10]      do_syscall_64+0xc6/0x1e0
[  706.028899][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.028899][   T10] 
[  706.031073][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  706.031073][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  706.031073][   T10]      ipv6_find_idev+0x102/0x170
[  706.031073][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  706.031073][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.031073][   T10]      netlink_rcv_skb+0x130/0x360
[  706.031073][   T10]      netlink_unicast+0x449/0x710
[  706.031073][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.031073][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.031073][   T10]      ___sys_sendmsg+0xee/0x170
[  706.031073][   T10]      __sys_sendmsg+0xcd/0x170
[  706.031073][   T10]      do_syscall_64+0xc6/0x1e0
[  706.031073][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.031073][   T10] 
[  706.032745][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  706.032745][   T10]      neigh_parms_alloc+0x1e5/0x510
[  706.032745][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  706.032745][   T10]      ipv6_find_idev+0x102/0x170
[  706.032745][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  706.032745][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.032745][   T10]      netlink_rcv_skb+0x130/0x360
[  706.032745][   T10]      netlink_unicast+0x449/0x710
[  706.032745][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.032745][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.032745][   T10]      ___sys_sendmsg+0xee/0x170
[  706.032745][   T10]      __sys_sendmsg+0xcd/0x170
[  706.032745][   T10]      do_syscall_64+0xc6/0x1e0
[  706.032745][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.032745][   T10] 
[  706.034621][   T10] unregister_netdevice: waiting for ns1eth1 to become free. Usage count = 4
[  706.034970][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  706.034970][   T10]      netdev_get_by_index+0x5e/0x80
[  706.034970][   T10]      fib6_nh_init+0x3d8/0x15b0
[  706.034970][   T10]      ip6_route_info_create+0xf18/0x17d0
[  706.034970][   T10]      addrconf_f6i_alloc+0x244/0x410
[  706.034970][   T10]      ipv6_add_addr+0x411/0x2000
[  706.034970][   T10]      inet6_addr_add+0x30e/0xa40
[  706.034970][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  706.034970][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.034970][   T10]      netlink_rcv_skb+0x130/0x360
[  706.034970][   T10]      netlink_unicast+0x449/0x710
[  706.034970][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.034970][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.034970][   T10]      ___sys_sendmsg+0xee/0x170
[  706.034970][   T10]      __sys_sendmsg+0xcd/0x170
[  706.034970][   T10]      do_syscall_64+0xc6/0x1e0
[  706.034970][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.034970][   T10] 
[  706.037147][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  706.037147][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  706.037147][   T10]      ipv6_find_idev+0x102/0x170
[  706.037147][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  706.037147][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.037147][   T10]      netlink_rcv_skb+0x130/0x360
[  706.037147][   T10]      netlink_unicast+0x449/0x710
[  706.037147][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.037147][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.037147][   T10]      ___sys_sendmsg+0xee/0x170
[  706.037147][   T10]      __sys_sendmsg+0xcd/0x170
[  706.037147][   T10]      do_syscall_64+0xc6/0x1e0
[  706.037147][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.037147][   T10] 
[  706.038831][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  706.038831][   T10]      neigh_parms_alloc+0x1e5/0x510
[  706.038831][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  706.038831][   T10]      ipv6_find_idev+0x102/0x170
[  706.038831][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  706.038831][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.038831][   T10]      netlink_rcv_skb+0x130/0x360
[  706.038831][   T10]      netlink_unicast+0x449/0x710
[  706.038831][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.038831][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.038831][   T10]      ___sys_sendmsg+0xee/0x170
[  706.038831][   T10]      __sys_sendmsg+0xcd/0x170
[  706.038831][   T10]      do_syscall_64+0xc6/0x1e0
[  706.038831][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.038831][   T10] 
[  706.040715][   T10] unregister_netdevice: waiting for ns2eth1 to become free. Usage count = 4
[  706.041051][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  706.041051][   T10]      netdev_get_by_index+0x5e/0x80
[  706.041051][   T10]      fib6_nh_init+0x3d8/0x15b0
[  706.041051][   T10]      ip6_route_info_create+0xf18/0x17d0
[  706.041051][   T10]      addrconf_f6i_alloc+0x244/0x410
[  706.041051][   T10]      ipv6_add_addr+0x411/0x2000
[  706.041051][   T10]      inet6_addr_add+0x30e/0xa40
[  706.041051][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  706.041051][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.041051][   T10]      netlink_rcv_skb+0x130/0x360
[  706.041051][   T10]      netlink_unicast+0x449/0x710
[  706.041051][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.041051][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.041051][   T10]      ___sys_sendmsg+0xee/0x170
[  706.041051][   T10]      __sys_sendmsg+0xcd/0x170
[  706.041051][   T10]      do_syscall_64+0xc6/0x1e0
[  706.041051][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.041051][   T10] 
[  706.043219][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  706.043219][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  706.043219][   T10]      ipv6_find_idev+0x102/0x170
[  706.043219][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  706.043219][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.043219][   T10]      netlink_rcv_skb+0x130/0x360
[  706.043219][   T10]      netlink_unicast+0x449/0x710
[  706.043219][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.043219][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.043219][   T10]      ___sys_sendmsg+0xee/0x170
[  706.043219][   T10]      __sys_sendmsg+0xcd/0x170
[  706.043219][   T10]      do_syscall_64+0xc6/0x1e0
[  706.043219][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.043219][   T10] 
[  706.045086][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  706.045086][   T10]      neigh_parms_alloc+0x1e5/0x510
[  706.045086][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  706.045086][   T10]      ipv6_find_idev+0x102/0x170
[  706.045086][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  706.045086][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  706.045086][   T10]      netlink_rcv_skb+0x130/0x360
[  706.045086][   T10]      netlink_unicast+0x449/0x710
[  706.045086][   T10]      netlink_sendmsg+0x723/0xbe0
[  706.045086][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  706.045086][   T10]      ___sys_sendmsg+0xee/0x170
[  706.045086][   T10]      __sys_sendmsg+0xcd/0x170
[  706.045086][   T10]      do_syscall_64+0xc6/0x1e0
[  706.045086][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  706.045086][   T10] 
[  716.107759][   T10] unregister_netdevice: waiting for ns1eth4 to become free. Usage count = 4
[  716.108173][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  716.108173][   T10]      netdev_get_by_index+0x5e/0x80
[  716.108173][   T10]      fib6_nh_init+0x3d8/0x15b0
[  716.108173][   T10]      ip6_route_info_create+0xf18/0x17d0
[  716.108173][   T10]      addrconf_f6i_alloc+0x244/0x410
[  716.108173][   T10]      ipv6_add_addr+0x411/0x2000
[  716.108173][   T10]      inet6_addr_add+0x30e/0xa40
[  716.108173][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  716.108173][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.108173][   T10]      netlink_rcv_skb+0x130/0x360
[  716.108173][   T10]      netlink_unicast+0x449/0x710
[  716.108173][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.108173][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.108173][   T10]      ___sys_sendmsg+0xee/0x170
[  716.108173][   T10]      __sys_sendmsg+0xcd/0x170
[  716.108173][   T10]      do_syscall_64+0xc6/0x1e0
[  716.108173][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.108173][   T10] 
[  716.110407][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  716.110407][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  716.110407][   T10]      ipv6_find_idev+0x102/0x170
[  716.110407][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  716.110407][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.110407][   T10]      netlink_rcv_skb+0x130/0x360
[  716.110407][   T10]      netlink_unicast+0x449/0x710
[  716.110407][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.110407][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.110407][   T10]      ___sys_sendmsg+0xee/0x170
[  716.110407][   T10]      __sys_sendmsg+0xcd/0x170
[  716.110407][   T10]      do_syscall_64+0xc6/0x1e0
[  716.110407][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.110407][   T10] 
[  716.112118][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  716.112118][   T10]      neigh_parms_alloc+0x1e5/0x510
[  716.112118][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  716.112118][   T10]      ipv6_find_idev+0x102/0x170
[  716.112118][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  716.112118][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.112118][   T10]      netlink_rcv_skb+0x130/0x360
[  716.112118][   T10]      netlink_unicast+0x449/0x710
[  716.112118][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.112118][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.112118][   T10]      ___sys_sendmsg+0xee/0x170
[  716.112118][   T10]      __sys_sendmsg+0xcd/0x170
[  716.112118][   T10]      do_syscall_64+0xc6/0x1e0
[  716.112118][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.112118][   T10] 
[  716.113977][   T10] unregister_netdevice: waiting for ns2eth4 to become free. Usage count = 4
[  716.114267][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  716.114267][   T10]      netdev_get_by_index+0x5e/0x80
[  716.114267][   T10]      fib6_nh_init+0x3d8/0x15b0
[  716.114267][   T10]      ip6_route_info_create+0xf18/0x17d0
[  716.114267][   T10]      addrconf_f6i_alloc+0x244/0x410
[  716.114267][   T10]      ipv6_add_addr+0x411/0x2000
[  716.114267][   T10]      inet6_addr_add+0x30e/0xa40
[  716.114267][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  716.114267][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.114267][   T10]      netlink_rcv_skb+0x130/0x360
[  716.114267][   T10]      netlink_unicast+0x449/0x710
[  716.114267][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.114267][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.114267][   T10]      ___sys_sendmsg+0xee/0x170
[  716.114267][   T10]      __sys_sendmsg+0xcd/0x170
[  716.114267][   T10]      do_syscall_64+0xc6/0x1e0
[  716.114267][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.114267][   T10] 
[  716.116474][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  716.116474][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  716.116474][   T10]      ipv6_find_idev+0x102/0x170
[  716.116474][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  716.116474][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.116474][   T10]      netlink_rcv_skb+0x130/0x360
[  716.116474][   T10]      netlink_unicast+0x449/0x710
[  716.116474][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.116474][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.116474][   T10]      ___sys_sendmsg+0xee/0x170
[  716.116474][   T10]      __sys_sendmsg+0xcd/0x170
[  716.116474][   T10]      do_syscall_64+0xc6/0x1e0
[  716.116474][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.116474][   T10] 
[  716.118249][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  716.118249][   T10]      neigh_parms_alloc+0x1e5/0x510
[  716.118249][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  716.118249][   T10]      ipv6_find_idev+0x102/0x170
[  716.118249][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  716.118249][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.118249][   T10]      netlink_rcv_skb+0x130/0x360
[  716.118249][   T10]      netlink_unicast+0x449/0x710
[  716.118249][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.118249][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.118249][   T10]      ___sys_sendmsg+0xee/0x170
[  716.118249][   T10]      __sys_sendmsg+0xcd/0x170
[  716.118249][   T10]      do_syscall_64+0xc6/0x1e0
[  716.118249][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.118249][   T10] 
[  716.120186][   T10] unregister_netdevice: waiting for ns1eth3 to become free. Usage count = 4
[  716.120487][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  716.120487][   T10]      netdev_get_by_index+0x5e/0x80
[  716.120487][   T10]      fib6_nh_init+0x3d8/0x15b0
[  716.120487][   T10]      ip6_route_info_create+0xf18/0x17d0
[  716.120487][   T10]      addrconf_f6i_alloc+0x244/0x410
[  716.120487][   T10]      ipv6_add_addr+0x411/0x2000
[  716.120487][   T10]      inet6_addr_add+0x30e/0xa40
[  716.120487][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  716.120487][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.120487][   T10]      netlink_rcv_skb+0x130/0x360
[  716.120487][   T10]      netlink_unicast+0x449/0x710
[  716.120487][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.120487][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.120487][   T10]      ___sys_sendmsg+0xee/0x170
[  716.120487][   T10]      __sys_sendmsg+0xcd/0x170
[  716.120487][   T10]      do_syscall_64+0xc6/0x1e0
[  716.120487][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.120487][   T10] 
[  716.122815][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  716.122815][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  716.122815][   T10]      ipv6_find_idev+0x102/0x170
[  716.122815][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  716.122815][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.122815][   T10]      netlink_rcv_skb+0x130/0x360
[  716.122815][   T10]      netlink_unicast+0x449/0x710
[  716.122815][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.122815][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.122815][   T10]      ___sys_sendmsg+0xee/0x170
[  716.122815][   T10]      __sys_sendmsg+0xcd/0x170
[  716.122815][   T10]      do_syscall_64+0xc6/0x1e0
[  716.122815][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.122815][   T10] 
[  716.124573][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  716.124573][   T10]      neigh_parms_alloc+0x1e5/0x510
[  716.124573][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  716.124573][   T10]      ipv6_find_idev+0x102/0x170
[  716.124573][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  716.124573][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.124573][   T10]      netlink_rcv_skb+0x130/0x360
[  716.124573][   T10]      netlink_unicast+0x449/0x710
[  716.124573][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.124573][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.124573][   T10]      ___sys_sendmsg+0xee/0x170
[  716.124573][   T10]      __sys_sendmsg+0xcd/0x170
[  716.124573][   T10]      do_syscall_64+0xc6/0x1e0
[  716.124573][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.124573][   T10] 
[  716.126518][   T10] unregister_netdevice: waiting for ns2eth3 to become free. Usage count = 4
[  716.126884][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  716.126884][   T10]      netdev_get_by_index+0x5e/0x80
[  716.126884][   T10]      fib6_nh_init+0x3d8/0x15b0
[  716.126884][   T10]      ip6_route_info_create+0xf18/0x17d0
[  716.126884][   T10]      addrconf_f6i_alloc+0x244/0x410
[  716.126884][   T10]      ipv6_add_addr+0x411/0x2000
[  716.126884][   T10]      inet6_addr_add+0x30e/0xa40
[  716.126884][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  716.126884][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.126884][   T10]      netlink_rcv_skb+0x130/0x360
[  716.126884][   T10]      netlink_unicast+0x449/0x710
[  716.126884][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.126884][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.126884][   T10]      ___sys_sendmsg+0xee/0x170
[  716.126884][   T10]      __sys_sendmsg+0xcd/0x170
[  716.126884][   T10]      do_syscall_64+0xc6/0x1e0
[  716.126884][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.126884][   T10] 
[  716.129210][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  716.129210][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  716.129210][   T10]      ipv6_find_idev+0x102/0x170
[  716.129210][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  716.129210][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.129210][   T10]      netlink_rcv_skb+0x130/0x360
[  716.129210][   T10]      netlink_unicast+0x449/0x710
[  716.129210][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.129210][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.129210][   T10]      ___sys_sendmsg+0xee/0x170
[  716.129210][   T10]      __sys_sendmsg+0xcd/0x170
[  716.129210][   T10]      do_syscall_64+0xc6/0x1e0
[  716.129210][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.129210][   T10] 
[  716.130919][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  716.130919][   T10]      neigh_parms_alloc+0x1e5/0x510
[  716.130919][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  716.130919][   T10]      ipv6_find_idev+0x102/0x170
[  716.130919][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  716.130919][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.130919][   T10]      netlink_rcv_skb+0x130/0x360
[  716.130919][   T10]      netlink_unicast+0x449/0x710
[  716.130919][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.130919][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.130919][   T10]      ___sys_sendmsg+0xee/0x170
[  716.130919][   T10]      __sys_sendmsg+0xcd/0x170
[  716.130919][   T10]      do_syscall_64+0xc6/0x1e0
[  716.130919][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.130919][   T10] 
[  716.132809][   T10] unregister_netdevice: waiting for ns1eth2 to become free. Usage count = 4
[  716.133151][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  716.133151][   T10]      netdev_get_by_index+0x5e/0x80
[  716.133151][   T10]      fib6_nh_init+0x3d8/0x15b0
[  716.133151][   T10]      ip6_route_info_create+0xf18/0x17d0
[  716.133151][   T10]      addrconf_f6i_alloc+0x244/0x410
[  716.133151][   T10]      ipv6_add_addr+0x411/0x2000
[  716.133151][   T10]      inet6_addr_add+0x30e/0xa40
[  716.133151][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  716.133151][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.133151][   T10]      netlink_rcv_skb+0x130/0x360
[  716.133151][   T10]      netlink_unicast+0x449/0x710
[  716.133151][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.133151][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.133151][   T10]      ___sys_sendmsg+0xee/0x170
[  716.133151][   T10]      __sys_sendmsg+0xcd/0x170
[  716.133151][   T10]      do_syscall_64+0xc6/0x1e0
[  716.133151][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.133151][   T10] 
[  716.135350][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  716.135350][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  716.135350][   T10]      ipv6_find_idev+0x102/0x170
[  716.135350][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  716.135350][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.135350][   T10]      netlink_rcv_skb+0x130/0x360
[  716.135350][   T10]      netlink_unicast+0x449/0x710
[  716.135350][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.135350][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.135350][   T10]      ___sys_sendmsg+0xee/0x170
[  716.135350][   T10]      __sys_sendmsg+0xcd/0x170
[  716.135350][   T10]      do_syscall_64+0xc6/0x1e0
[  716.135350][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.135350][   T10] 
[  716.137060][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  716.137060][   T10]      neigh_parms_alloc+0x1e5/0x510
[  716.137060][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  716.137060][   T10]      ipv6_find_idev+0x102/0x170
[  716.137060][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  716.137060][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.137060][   T10]      netlink_rcv_skb+0x130/0x360
[  716.137060][   T10]      netlink_unicast+0x449/0x710
[  716.137060][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.137060][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.137060][   T10]      ___sys_sendmsg+0xee/0x170
[  716.137060][   T10]      __sys_sendmsg+0xcd/0x170
[  716.137060][   T10]      do_syscall_64+0xc6/0x1e0
[  716.137060][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.137060][   T10] 
[  716.139129][   T10] unregister_netdevice: waiting for ns2eth2 to become free. Usage count = 4
[  716.139413][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  716.139413][   T10]      netdev_get_by_index+0x5e/0x80
[  716.139413][   T10]      fib6_nh_init+0x3d8/0x15b0
[  716.139413][   T10]      ip6_route_info_create+0xf18/0x17d0
[  716.139413][   T10]      addrconf_f6i_alloc+0x244/0x410
[  716.139413][   T10]      ipv6_add_addr+0x411/0x2000
[  716.139413][   T10]      inet6_addr_add+0x30e/0xa40
[  716.139413][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  716.139413][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.139413][   T10]      netlink_rcv_skb+0x130/0x360
[  716.139413][   T10]      netlink_unicast+0x449/0x710
[  716.139413][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.139413][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.139413][   T10]      ___sys_sendmsg+0xee/0x170
[  716.139413][   T10]      __sys_sendmsg+0xcd/0x170
[  716.139413][   T10]      do_syscall_64+0xc6/0x1e0
[  716.139413][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.139413][   T10] 
[  716.141903][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  716.141903][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  716.141903][   T10]      ipv6_find_idev+0x102/0x170
[  716.141903][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  716.141903][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.141903][   T10]      netlink_rcv_skb+0x130/0x360
[  716.141903][   T10]      netlink_unicast+0x449/0x710
[  716.141903][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.141903][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.141903][   T10]      ___sys_sendmsg+0xee/0x170
[  716.141903][   T10]      __sys_sendmsg+0xcd/0x170
[  716.141903][   T10]      do_syscall_64+0xc6/0x1e0
[  716.141903][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.141903][   T10] 
[  716.143773][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  716.143773][   T10]      neigh_parms_alloc+0x1e5/0x510
[  716.143773][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  716.143773][   T10]      ipv6_find_idev+0x102/0x170
[  716.143773][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  716.143773][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.143773][   T10]      netlink_rcv_skb+0x130/0x360
[  716.143773][   T10]      netlink_unicast+0x449/0x710
[  716.143773][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.143773][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.143773][   T10]      ___sys_sendmsg+0xee/0x170
[  716.143773][   T10]      __sys_sendmsg+0xcd/0x170
[  716.143773][   T10]      do_syscall_64+0xc6/0x1e0
[  716.143773][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.143773][   T10] 
[  716.145835][   T10] unregister_netdevice: waiting for ns1eth1 to become free. Usage count = 4
[  716.146117][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  716.146117][   T10]      netdev_get_by_index+0x5e/0x80
[  716.146117][   T10]      fib6_nh_init+0x3d8/0x15b0
[  716.146117][   T10]      ip6_route_info_create+0xf18/0x17d0
[  716.146117][   T10]      addrconf_f6i_alloc+0x244/0x410
[  716.146117][   T10]      ipv6_add_addr+0x411/0x2000
[  716.146117][   T10]      inet6_addr_add+0x30e/0xa40
[  716.146117][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  716.146117][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.146117][   T10]      netlink_rcv_skb+0x130/0x360
[  716.146117][   T10]      netlink_unicast+0x449/0x710
[  716.146117][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.146117][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.146117][   T10]      ___sys_sendmsg+0xee/0x170
[  716.146117][   T10]      __sys_sendmsg+0xcd/0x170
[  716.146117][   T10]      do_syscall_64+0xc6/0x1e0
[  716.146117][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.146117][   T10] 
[  716.148555][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  716.148555][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  716.148555][   T10]      ipv6_find_idev+0x102/0x170
[  716.148555][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  716.148555][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.148555][   T10]      netlink_rcv_skb+0x130/0x360
[  716.148555][   T10]      netlink_unicast+0x449/0x710
[  716.148555][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.148555][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.148555][   T10]      ___sys_sendmsg+0xee/0x170
[  716.148555][   T10]      __sys_sendmsg+0xcd/0x170
[  716.148555][   T10]      do_syscall_64+0xc6/0x1e0
[  716.148555][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.148555][   T10] 
[  716.150352][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  716.150352][   T10]      neigh_parms_alloc+0x1e5/0x510
[  716.150352][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  716.150352][   T10]      ipv6_find_idev+0x102/0x170
[  716.150352][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  716.150352][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.150352][   T10]      netlink_rcv_skb+0x130/0x360
[  716.150352][   T10]      netlink_unicast+0x449/0x710
[  716.150352][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.150352][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.150352][   T10]      ___sys_sendmsg+0xee/0x170
[  716.150352][   T10]      __sys_sendmsg+0xcd/0x170
[  716.150352][   T10]      do_syscall_64+0xc6/0x1e0
[  716.150352][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.150352][   T10] 
[  716.152530][   T10] unregister_netdevice: waiting for ns2eth1 to become free. Usage count = 4
[  716.152864][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  716.152864][   T10]      netdev_get_by_index+0x5e/0x80
[  716.152864][   T10]      fib6_nh_init+0x3d8/0x15b0
[  716.152864][   T10]      ip6_route_info_create+0xf18/0x17d0
[  716.152864][   T10]      addrconf_f6i_alloc+0x244/0x410
[  716.152864][   T10]      ipv6_add_addr+0x411/0x2000
[  716.152864][   T10]      inet6_addr_add+0x30e/0xa40
[  716.152864][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  716.152864][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.152864][   T10]      netlink_rcv_skb+0x130/0x360
[  716.152864][   T10]      netlink_unicast+0x449/0x710
[  716.152864][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.152864][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.152864][   T10]      ___sys_sendmsg+0xee/0x170
[  716.152864][   T10]      __sys_sendmsg+0xcd/0x170
[  716.152864][   T10]      do_syscall_64+0xc6/0x1e0
[  716.152864][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.152864][   T10] 
[  716.155333][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  716.155333][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  716.155333][   T10]      ipv6_find_idev+0x102/0x170
[  716.155333][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  716.155333][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.155333][   T10]      netlink_rcv_skb+0x130/0x360
[  716.155333][   T10]      netlink_unicast+0x449/0x710
[  716.155333][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.155333][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.155333][   T10]      ___sys_sendmsg+0xee/0x170
[  716.155333][   T10]      __sys_sendmsg+0xcd/0x170
[  716.155333][   T10]      do_syscall_64+0xc6/0x1e0
[  716.155333][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.155333][   T10] 
[  716.157281][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  716.157281][   T10]      neigh_parms_alloc+0x1e5/0x510
[  716.157281][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  716.157281][   T10]      ipv6_find_idev+0x102/0x170
[  716.157281][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  716.157281][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  716.157281][   T10]      netlink_rcv_skb+0x130/0x360
[  716.157281][   T10]      netlink_unicast+0x449/0x710
[  716.157281][   T10]      netlink_sendmsg+0x723/0xbe0
[  716.157281][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  716.157281][   T10]      ___sys_sendmsg+0xee/0x170
[  716.157281][   T10]      __sys_sendmsg+0xcd/0x170
[  716.157281][   T10]      do_syscall_64+0xc6/0x1e0
[  716.157281][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  716.157281][   T10] 
[  726.395781][   T10] unregister_netdevice: waiting for ns1eth4 to become free. Usage count = 4
[  726.396192][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  726.396192][   T10]      netdev_get_by_index+0x5e/0x80
[  726.396192][   T10]      fib6_nh_init+0x3d8/0x15b0
[  726.396192][   T10]      ip6_route_info_create+0xf18/0x17d0
[  726.396192][   T10]      addrconf_f6i_alloc+0x244/0x410
[  726.396192][   T10]      ipv6_add_addr+0x411/0x2000
[  726.396192][   T10]      inet6_addr_add+0x30e/0xa40
[  726.396192][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  726.396192][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.396192][   T10]      netlink_rcv_skb+0x130/0x360
[  726.396192][   T10]      netlink_unicast+0x449/0x710
[  726.396192][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.396192][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.396192][   T10]      ___sys_sendmsg+0xee/0x170
[  726.396192][   T10]      __sys_sendmsg+0xcd/0x170
[  726.396192][   T10]      do_syscall_64+0xc6/0x1e0
[  726.396192][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.396192][   T10] 
[  726.398479][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  726.398479][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  726.398479][   T10]      ipv6_find_idev+0x102/0x170
[  726.398479][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  726.398479][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.398479][   T10]      netlink_rcv_skb+0x130/0x360
[  726.398479][   T10]      netlink_unicast+0x449/0x710
[  726.398479][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.398479][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.398479][   T10]      ___sys_sendmsg+0xee/0x170
[  726.398479][   T10]      __sys_sendmsg+0xcd/0x170
[  726.398479][   T10]      do_syscall_64+0xc6/0x1e0
[  726.398479][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.398479][   T10] 
[  726.400197][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  726.400197][   T10]      neigh_parms_alloc+0x1e5/0x510
[  726.400197][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  726.400197][   T10]      ipv6_find_idev+0x102/0x170
[  726.400197][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  726.400197][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.400197][   T10]      netlink_rcv_skb+0x130/0x360
[  726.400197][   T10]      netlink_unicast+0x449/0x710
[  726.400197][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.400197][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.400197][   T10]      ___sys_sendmsg+0xee/0x170
[  726.400197][   T10]      __sys_sendmsg+0xcd/0x170
[  726.400197][   T10]      do_syscall_64+0xc6/0x1e0
[  726.400197][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.400197][   T10] 
[  726.402069][   T10] unregister_netdevice: waiting for ns2eth4 to become free. Usage count = 4
[  726.402367][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  726.402367][   T10]      netdev_get_by_index+0x5e/0x80
[  726.402367][   T10]      fib6_nh_init+0x3d8/0x15b0
[  726.402367][   T10]      ip6_route_info_create+0xf18/0x17d0
[  726.402367][   T10]      addrconf_f6i_alloc+0x244/0x410
[  726.402367][   T10]      ipv6_add_addr+0x411/0x2000
[  726.402367][   T10]      inet6_addr_add+0x30e/0xa40
[  726.402367][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  726.402367][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.402367][   T10]      netlink_rcv_skb+0x130/0x360
[  726.402367][   T10]      netlink_unicast+0x449/0x710
[  726.402367][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.402367][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.402367][   T10]      ___sys_sendmsg+0xee/0x170
[  726.402367][   T10]      __sys_sendmsg+0xcd/0x170
[  726.402367][   T10]      do_syscall_64+0xc6/0x1e0
[  726.402367][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.402367][   T10] 
[  726.404590][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  726.404590][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  726.404590][   T10]      ipv6_find_idev+0x102/0x170
[  726.404590][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  726.404590][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.404590][   T10]      netlink_rcv_skb+0x130/0x360
[  726.404590][   T10]      netlink_unicast+0x449/0x710
[  726.404590][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.404590][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.404590][   T10]      ___sys_sendmsg+0xee/0x170
[  726.404590][   T10]      __sys_sendmsg+0xcd/0x170
[  726.404590][   T10]      do_syscall_64+0xc6/0x1e0
[  726.404590][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.404590][   T10] 
[  726.406309][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  726.406309][   T10]      neigh_parms_alloc+0x1e5/0x510
[  726.406309][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  726.406309][   T10]      ipv6_find_idev+0x102/0x170
[  726.406309][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  726.406309][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.406309][   T10]      netlink_rcv_skb+0x130/0x360
[  726.406309][   T10]      netlink_unicast+0x449/0x710
[  726.406309][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.406309][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.406309][   T10]      ___sys_sendmsg+0xee/0x170
[  726.406309][   T10]      __sys_sendmsg+0xcd/0x170
[  726.406309][   T10]      do_syscall_64+0xc6/0x1e0
[  726.406309][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.406309][   T10] 
[  726.408165][   T10] unregister_netdevice: waiting for ns1eth3 to become free. Usage count = 4
[  726.408450][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  726.408450][   T10]      netdev_get_by_index+0x5e/0x80
[  726.408450][   T10]      fib6_nh_init+0x3d8/0x15b0
[  726.408450][   T10]      ip6_route_info_create+0xf18/0x17d0
[  726.408450][   T10]      addrconf_f6i_alloc+0x244/0x410
[  726.408450][   T10]      ipv6_add_addr+0x411/0x2000
[  726.408450][   T10]      inet6_addr_add+0x30e/0xa40
[  726.408450][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  726.408450][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.408450][   T10]      netlink_rcv_skb+0x130/0x360
[  726.408450][   T10]      netlink_unicast+0x449/0x710
[  726.408450][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.408450][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.408450][   T10]      ___sys_sendmsg+0xee/0x170
[  726.408450][   T10]      __sys_sendmsg+0xcd/0x170
[  726.408450][   T10]      do_syscall_64+0xc6/0x1e0
[  726.408450][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.408450][   T10] 
[  726.410762][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  726.410762][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  726.410762][   T10]      ipv6_find_idev+0x102/0x170
[  726.410762][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  726.410762][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.410762][   T10]      netlink_rcv_skb+0x130/0x360
[  726.410762][   T10]      netlink_unicast+0x449/0x710
[  726.410762][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.410762][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.410762][   T10]      ___sys_sendmsg+0xee/0x170
[  726.410762][   T10]      __sys_sendmsg+0xcd/0x170
[  726.410762][   T10]      do_syscall_64+0xc6/0x1e0
[  726.410762][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.410762][   T10] 
[  726.412537][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  726.412537][   T10]      neigh_parms_alloc+0x1e5/0x510
[  726.412537][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  726.412537][   T10]      ipv6_find_idev+0x102/0x170
[  726.412537][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  726.412537][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.412537][   T10]      netlink_rcv_skb+0x130/0x360
[  726.412537][   T10]      netlink_unicast+0x449/0x710
[  726.412537][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.412537][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.412537][   T10]      ___sys_sendmsg+0xee/0x170
[  726.412537][   T10]      __sys_sendmsg+0xcd/0x170
[  726.412537][   T10]      do_syscall_64+0xc6/0x1e0
[  726.412537][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.412537][   T10] 
[  726.414480][   T10] unregister_netdevice: waiting for ns2eth3 to become free. Usage count = 4
[  726.415232][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  726.415232][   T10]      netdev_get_by_index+0x5e/0x80
[  726.415232][   T10]      fib6_nh_init+0x3d8/0x15b0
[  726.415232][   T10]      ip6_route_info_create+0xf18/0x17d0
[  726.415232][   T10]      addrconf_f6i_alloc+0x244/0x410
[  726.415232][   T10]      ipv6_add_addr+0x411/0x2000
[  726.415232][   T10]      inet6_addr_add+0x30e/0xa40
[  726.415232][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  726.415232][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.415232][   T10]      netlink_rcv_skb+0x130/0x360
[  726.415232][   T10]      netlink_unicast+0x449/0x710
[  726.415232][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.415232][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.415232][   T10]      ___sys_sendmsg+0xee/0x170
[  726.415232][   T10]      __sys_sendmsg+0xcd/0x170
[  726.415232][   T10]      do_syscall_64+0xc6/0x1e0
[  726.415232][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.415232][   T10] 
[  726.417561][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  726.417561][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  726.417561][   T10]      ipv6_find_idev+0x102/0x170
[  726.417561][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  726.417561][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.417561][   T10]      netlink_rcv_skb+0x130/0x360
[  726.417561][   T10]      netlink_unicast+0x449/0x710
[  726.417561][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.417561][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.417561][   T10]      ___sys_sendmsg+0xee/0x170
[  726.417561][   T10]      __sys_sendmsg+0xcd/0x170
[  726.417561][   T10]      do_syscall_64+0xc6/0x1e0
[  726.417561][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.417561][   T10] 
[  726.419358][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  726.419358][   T10]      neigh_parms_alloc+0x1e5/0x510
[  726.419358][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  726.419358][   T10]      ipv6_find_idev+0x102/0x170
[  726.419358][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  726.419358][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.419358][   T10]      netlink_rcv_skb+0x130/0x360
[  726.419358][   T10]      netlink_unicast+0x449/0x710
[  726.419358][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.419358][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.419358][   T10]      ___sys_sendmsg+0xee/0x170
[  726.419358][   T10]      __sys_sendmsg+0xcd/0x170
[  726.419358][   T10]      do_syscall_64+0xc6/0x1e0
[  726.419358][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.419358][   T10] 
[  726.421336][   T10] unregister_netdevice: waiting for ns1eth2 to become free. Usage count = 4
[  726.421633][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  726.421633][   T10]      netdev_get_by_index+0x5e/0x80
[  726.421633][   T10]      fib6_nh_init+0x3d8/0x15b0
[  726.421633][   T10]      ip6_route_info_create+0xf18/0x17d0
[  726.421633][   T10]      addrconf_f6i_alloc+0x244/0x410
[  726.421633][   T10]      ipv6_add_addr+0x411/0x2000
[  726.421633][   T10]      inet6_addr_add+0x30e/0xa40
[  726.421633][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  726.421633][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.421633][   T10]      netlink_rcv_skb+0x130/0x360
[  726.421633][   T10]      netlink_unicast+0x449/0x710
[  726.421633][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.421633][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.421633][   T10]      ___sys_sendmsg+0xee/0x170
[  726.421633][   T10]      __sys_sendmsg+0xcd/0x170
[  726.421633][   T10]      do_syscall_64+0xc6/0x1e0
[  726.421633][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.421633][   T10] 
[  726.423938][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  726.423938][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  726.423938][   T10]      ipv6_find_idev+0x102/0x170
[  726.423938][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  726.423938][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.423938][   T10]      netlink_rcv_skb+0x130/0x360
[  726.423938][   T10]      netlink_unicast+0x449/0x710
[  726.423938][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.423938][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.423938][   T10]      ___sys_sendmsg+0xee/0x170
[  726.423938][   T10]      __sys_sendmsg+0xcd/0x170
[  726.423938][   T10]      do_syscall_64+0xc6/0x1e0
[  726.423938][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.423938][   T10] 
[  726.425725][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  726.425725][   T10]      neigh_parms_alloc+0x1e5/0x510
[  726.425725][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  726.425725][   T10]      ipv6_find_idev+0x102/0x170
[  726.425725][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  726.425725][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.425725][   T10]      netlink_rcv_skb+0x130/0x360
[  726.425725][   T10]      netlink_unicast+0x449/0x710
[  726.425725][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.425725][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.425725][   T10]      ___sys_sendmsg+0xee/0x170
[  726.425725][   T10]      __sys_sendmsg+0xcd/0x170
[  726.425725][   T10]      do_syscall_64+0xc6/0x1e0
[  726.425725][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.425725][   T10] 
[  726.427702][   T10] unregister_netdevice: waiting for ns2eth2 to become free. Usage count = 4
[  726.428002][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  726.428002][   T10]      netdev_get_by_index+0x5e/0x80
[  726.428002][   T10]      fib6_nh_init+0x3d8/0x15b0
[  726.428002][   T10]      ip6_route_info_create+0xf18/0x17d0
[  726.428002][   T10]      addrconf_f6i_alloc+0x244/0x410
[  726.428002][   T10]      ipv6_add_addr+0x411/0x2000
[  726.428002][   T10]      inet6_addr_add+0x30e/0xa40
[  726.428002][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  726.428002][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.428002][   T10]      netlink_rcv_skb+0x130/0x360
[  726.428002][   T10]      netlink_unicast+0x449/0x710
[  726.428002][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.428002][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.428002][   T10]      ___sys_sendmsg+0xee/0x170
[  726.428002][   T10]      __sys_sendmsg+0xcd/0x170
[  726.428002][   T10]      do_syscall_64+0xc6/0x1e0
[  726.428002][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.428002][   T10] 
[  726.430371][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  726.430371][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  726.430371][   T10]      ipv6_find_idev+0x102/0x170
[  726.430371][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  726.430371][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.430371][   T10]      netlink_rcv_skb+0x130/0x360
[  726.430371][   T10]      netlink_unicast+0x449/0x710
[  726.430371][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.430371][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.430371][   T10]      ___sys_sendmsg+0xee/0x170
[  726.430371][   T10]      __sys_sendmsg+0xcd/0x170
[  726.430371][   T10]      do_syscall_64+0xc6/0x1e0
[  726.430371][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.430371][   T10] 
[  726.432395][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  726.432395][   T10]      neigh_parms_alloc+0x1e5/0x510
[  726.432395][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  726.432395][   T10]      ipv6_find_idev+0x102/0x170
[  726.432395][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  726.432395][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.432395][   T10]      netlink_rcv_skb+0x130/0x360
[  726.432395][   T10]      netlink_unicast+0x449/0x710
[  726.432395][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.432395][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.432395][   T10]      ___sys_sendmsg+0xee/0x170
[  726.432395][   T10]      __sys_sendmsg+0xcd/0x170
[  726.432395][   T10]      do_syscall_64+0xc6/0x1e0
[  726.432395][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.432395][   T10] 
[  726.434597][   T10] unregister_netdevice: waiting for ns1eth1 to become free. Usage count = 4
[  726.434956][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  726.434956][   T10]      netdev_get_by_index+0x5e/0x80
[  726.434956][   T10]      fib6_nh_init+0x3d8/0x15b0
[  726.434956][   T10]      ip6_route_info_create+0xf18/0x17d0
[  726.434956][   T10]      addrconf_f6i_alloc+0x244/0x410
[  726.434956][   T10]      ipv6_add_addr+0x411/0x2000
[  726.434956][   T10]      inet6_addr_add+0x30e/0xa40
[  726.434956][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  726.434956][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.434956][   T10]      netlink_rcv_skb+0x130/0x360
[  726.434956][   T10]      netlink_unicast+0x449/0x710
[  726.434956][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.434956][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.434956][   T10]      ___sys_sendmsg+0xee/0x170
[  726.434956][   T10]      __sys_sendmsg+0xcd/0x170
[  726.434956][   T10]      do_syscall_64+0xc6/0x1e0
[  726.434956][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.434956][   T10] 
[  726.437457][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  726.437457][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  726.437457][   T10]      ipv6_find_idev+0x102/0x170
[  726.437457][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  726.437457][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.437457][   T10]      netlink_rcv_skb+0x130/0x360
[  726.437457][   T10]      netlink_unicast+0x449/0x710
[  726.437457][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.437457][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.437457][   T10]      ___sys_sendmsg+0xee/0x170
[  726.437457][   T10]      __sys_sendmsg+0xcd/0x170
[  726.437457][   T10]      do_syscall_64+0xc6/0x1e0
[  726.437457][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.437457][   T10] 
[  726.439407][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  726.439407][   T10]      neigh_parms_alloc+0x1e5/0x510
[  726.439407][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  726.439407][   T10]      ipv6_find_idev+0x102/0x170
[  726.439407][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  726.439407][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.439407][   T10]      netlink_rcv_skb+0x130/0x360
[  726.439407][   T10]      netlink_unicast+0x449/0x710
[  726.439407][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.439407][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.439407][   T10]      ___sys_sendmsg+0xee/0x170
[  726.439407][   T10]      __sys_sendmsg+0xcd/0x170
[  726.439407][   T10]      do_syscall_64+0xc6/0x1e0
[  726.439407][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.439407][   T10] 
[  726.441572][   T10] unregister_netdevice: waiting for ns2eth1 to become free. Usage count = 4
[  726.441927][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  726.441927][   T10]      netdev_get_by_index+0x5e/0x80
[  726.441927][   T10]      fib6_nh_init+0x3d8/0x15b0
[  726.441927][   T10]      ip6_route_info_create+0xf18/0x17d0
[  726.441927][   T10]      addrconf_f6i_alloc+0x244/0x410
[  726.441927][   T10]      ipv6_add_addr+0x411/0x2000
[  726.441927][   T10]      inet6_addr_add+0x30e/0xa40
[  726.441927][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  726.441927][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.441927][   T10]      netlink_rcv_skb+0x130/0x360
[  726.441927][   T10]      netlink_unicast+0x449/0x710
[  726.441927][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.441927][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.441927][   T10]      ___sys_sendmsg+0xee/0x170
[  726.441927][   T10]      __sys_sendmsg+0xcd/0x170
[  726.441927][   T10]      do_syscall_64+0xc6/0x1e0
[  726.441927][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.441927][   T10] 
[  726.444489][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  726.444489][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  726.444489][   T10]      ipv6_find_idev+0x102/0x170
[  726.444489][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  726.444489][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.444489][   T10]      netlink_rcv_skb+0x130/0x360
[  726.444489][   T10]      netlink_unicast+0x449/0x710
[  726.444489][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.444489][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.444489][   T10]      ___sys_sendmsg+0xee/0x170
[  726.444489][   T10]      __sys_sendmsg+0xcd/0x170
[  726.444489][   T10]      do_syscall_64+0xc6/0x1e0
[  726.444489][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.444489][   T10] 
[  726.446451][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  726.446451][   T10]      neigh_parms_alloc+0x1e5/0x510
[  726.446451][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  726.446451][   T10]      ipv6_find_idev+0x102/0x170
[  726.446451][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  726.446451][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  726.446451][   T10]      netlink_rcv_skb+0x130/0x360
[  726.446451][   T10]      netlink_unicast+0x449/0x710
[  726.446451][   T10]      netlink_sendmsg+0x723/0xbe0
[  726.446451][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  726.446451][   T10]      ___sys_sendmsg+0xee/0x170
[  726.446451][   T10]      __sys_sendmsg+0xcd/0x170
[  726.446451][   T10]      do_syscall_64+0xc6/0x1e0
[  726.446451][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  726.446451][   T10] 
[  736.659749][   T10] unregister_netdevice: waiting for ns1eth4 to become free. Usage count = 4
[  736.660181][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  736.660181][   T10]      netdev_get_by_index+0x5e/0x80
[  736.660181][   T10]      fib6_nh_init+0x3d8/0x15b0
[  736.660181][   T10]      ip6_route_info_create+0xf18/0x17d0
[  736.660181][   T10]      addrconf_f6i_alloc+0x244/0x410
[  736.660181][   T10]      ipv6_add_addr+0x411/0x2000
[  736.660181][   T10]      inet6_addr_add+0x30e/0xa40
[  736.660181][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  736.660181][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.660181][   T10]      netlink_rcv_skb+0x130/0x360
[  736.660181][   T10]      netlink_unicast+0x449/0x710
[  736.660181][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.660181][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.660181][   T10]      ___sys_sendmsg+0xee/0x170
[  736.660181][   T10]      __sys_sendmsg+0xcd/0x170
[  736.660181][   T10]      do_syscall_64+0xc6/0x1e0
[  736.660181][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.660181][   T10] 
[  736.662514][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  736.662514][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  736.662514][   T10]      ipv6_find_idev+0x102/0x170
[  736.662514][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  736.662514][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.662514][   T10]      netlink_rcv_skb+0x130/0x360
[  736.662514][   T10]      netlink_unicast+0x449/0x710
[  736.662514][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.662514][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.662514][   T10]      ___sys_sendmsg+0xee/0x170
[  736.662514][   T10]      __sys_sendmsg+0xcd/0x170
[  736.662514][   T10]      do_syscall_64+0xc6/0x1e0
[  736.662514][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.662514][   T10] 
[  736.664296][   T10] ref_tracker: ns1eth4@ffff888005bd95c0 has 1/3 users at
[  736.664296][   T10]      neigh_parms_alloc+0x1e5/0x510
[  736.664296][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  736.664296][   T10]      ipv6_find_idev+0x102/0x170
[  736.664296][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  736.664296][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.664296][   T10]      netlink_rcv_skb+0x130/0x360
[  736.664296][   T10]      netlink_unicast+0x449/0x710
[  736.664296][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.664296][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.664296][   T10]      ___sys_sendmsg+0xee/0x170
[  736.664296][   T10]      __sys_sendmsg+0xcd/0x170
[  736.664296][   T10]      do_syscall_64+0xc6/0x1e0
[  736.664296][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.664296][   T10] 
[  736.666261][   T10] unregister_netdevice: waiting for ns2eth4 to become free. Usage count = 4
[  736.666567][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  736.666567][   T10]      netdev_get_by_index+0x5e/0x80
[  736.666567][   T10]      fib6_nh_init+0x3d8/0x15b0
[  736.666567][   T10]      ip6_route_info_create+0xf18/0x17d0
[  736.666567][   T10]      addrconf_f6i_alloc+0x244/0x410
[  736.666567][   T10]      ipv6_add_addr+0x411/0x2000
[  736.666567][   T10]      inet6_addr_add+0x30e/0xa40
[  736.666567][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  736.666567][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.666567][   T10]      netlink_rcv_skb+0x130/0x360
[  736.666567][   T10]      netlink_unicast+0x449/0x710
[  736.666567][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.666567][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.666567][   T10]      ___sys_sendmsg+0xee/0x170
[  736.666567][   T10]      __sys_sendmsg+0xcd/0x170
[  736.666567][   T10]      do_syscall_64+0xc6/0x1e0
[  736.666567][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.666567][   T10] 
[  736.668870][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  736.668870][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  736.668870][   T10]      ipv6_find_idev+0x102/0x170
[  736.668870][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  736.668870][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.668870][   T10]      netlink_rcv_skb+0x130/0x360
[  736.668870][   T10]      netlink_unicast+0x449/0x710
[  736.668870][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.668870][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.668870][   T10]      ___sys_sendmsg+0xee/0x170
[  736.668870][   T10]      __sys_sendmsg+0xcd/0x170
[  736.668870][   T10]      do_syscall_64+0xc6/0x1e0
[  736.668870][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.668870][   T10] 
[  736.670656][   T10] ref_tracker: ns2eth4@ffff888007d895c0 has 1/3 users at
[  736.670656][   T10]      neigh_parms_alloc+0x1e5/0x510
[  736.670656][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  736.670656][   T10]      ipv6_find_idev+0x102/0x170
[  736.670656][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  736.670656][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.670656][   T10]      netlink_rcv_skb+0x130/0x360
[  736.670656][   T10]      netlink_unicast+0x449/0x710
[  736.670656][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.670656][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.670656][   T10]      ___sys_sendmsg+0xee/0x170
[  736.670656][   T10]      __sys_sendmsg+0xcd/0x170
[  736.670656][   T10]      do_syscall_64+0xc6/0x1e0
[  736.670656][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.670656][   T10] 
[  736.672593][   T10] unregister_netdevice: waiting for ns1eth3 to become free. Usage count = 4
[  736.672914][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  736.672914][   T10]      netdev_get_by_index+0x5e/0x80
[  736.672914][   T10]      fib6_nh_init+0x3d8/0x15b0
[  736.672914][   T10]      ip6_route_info_create+0xf18/0x17d0
[  736.672914][   T10]      addrconf_f6i_alloc+0x244/0x410
[  736.672914][   T10]      ipv6_add_addr+0x411/0x2000
[  736.672914][   T10]      inet6_addr_add+0x30e/0xa40
[  736.672914][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  736.672914][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.672914][   T10]      netlink_rcv_skb+0x130/0x360
[  736.672914][   T10]      netlink_unicast+0x449/0x710
[  736.672914][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.672914][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.672914][   T10]      ___sys_sendmsg+0xee/0x170
[  736.672914][   T10]      __sys_sendmsg+0xcd/0x170
[  736.672914][   T10]      do_syscall_64+0xc6/0x1e0
[  736.672914][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.672914][   T10] 
[  736.675242][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  736.675242][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  736.675242][   T10]      ipv6_find_idev+0x102/0x170
[  736.675242][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  736.675242][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.675242][   T10]      netlink_rcv_skb+0x130/0x360
[  736.675242][   T10]      netlink_unicast+0x449/0x710
[  736.675242][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.675242][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.675242][   T10]      ___sys_sendmsg+0xee/0x170
[  736.675242][   T10]      __sys_sendmsg+0xcd/0x170
[  736.675242][   T10]      do_syscall_64+0xc6/0x1e0
[  736.675242][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.675242][   T10] 
[  736.677031][   T10] ref_tracker: ns1eth3@ffff888007b815c0 has 1/3 users at
[  736.677031][   T10]      neigh_parms_alloc+0x1e5/0x510
[  736.677031][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  736.677031][   T10]      ipv6_find_idev+0x102/0x170
[  736.677031][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  736.677031][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.677031][   T10]      netlink_rcv_skb+0x130/0x360
[  736.677031][   T10]      netlink_unicast+0x449/0x710
[  736.677031][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.677031][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.677031][   T10]      ___sys_sendmsg+0xee/0x170
[  736.677031][   T10]      __sys_sendmsg+0xcd/0x170
[  736.677031][   T10]      do_syscall_64+0xc6/0x1e0
[  736.677031][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.677031][   T10] 
[  736.678976][   T10] unregister_netdevice: waiting for ns2eth3 to become free. Usage count = 4
[  736.679278][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  736.679278][   T10]      netdev_get_by_index+0x5e/0x80
[  736.679278][   T10]      fib6_nh_init+0x3d8/0x15b0
[  736.679278][   T10]      ip6_route_info_create+0xf18/0x17d0
[  736.679278][   T10]      addrconf_f6i_alloc+0x244/0x410
[  736.679278][   T10]      ipv6_add_addr+0x411/0x2000
[  736.679278][   T10]      inet6_addr_add+0x30e/0xa40
[  736.679278][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  736.679278][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.679278][   T10]      netlink_rcv_skb+0x130/0x360
[  736.679278][   T10]      netlink_unicast+0x449/0x710
[  736.679278][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.679278][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.679278][   T10]      ___sys_sendmsg+0xee/0x170
[  736.679278][   T10]      __sys_sendmsg+0xcd/0x170
[  736.679278][   T10]      do_syscall_64+0xc6/0x1e0
[  736.679278][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.679278][   T10] 
[  736.681589][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  736.681589][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  736.681589][   T10]      ipv6_find_idev+0x102/0x170
[  736.681589][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  736.681589][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.681589][   T10]      netlink_rcv_skb+0x130/0x360
[  736.681589][   T10]      netlink_unicast+0x449/0x710
[  736.681589][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.681589][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.681589][   T10]      ___sys_sendmsg+0xee/0x170
[  736.681589][   T10]      __sys_sendmsg+0xcd/0x170
[  736.681589][   T10]      do_syscall_64+0xc6/0x1e0
[  736.681589][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.681589][   T10] 
[  736.683361][   T10] ref_tracker: ns2eth3@ffff888007b845c0 has 1/3 users at
[  736.683361][   T10]      neigh_parms_alloc+0x1e5/0x510
[  736.683361][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  736.683361][   T10]      ipv6_find_idev+0x102/0x170
[  736.683361][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  736.683361][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.683361][   T10]      netlink_rcv_skb+0x130/0x360
[  736.683361][   T10]      netlink_unicast+0x449/0x710
[  736.683361][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.683361][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.683361][   T10]      ___sys_sendmsg+0xee/0x170
[  736.683361][   T10]      __sys_sendmsg+0xcd/0x170
[  736.683361][   T10]      do_syscall_64+0xc6/0x1e0
[  736.683361][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.683361][   T10] 
[  736.685710][   T10] unregister_netdevice: waiting for ns1eth2 to become free. Usage count = 4
[  736.686010][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  736.686010][   T10]      netdev_get_by_index+0x5e/0x80
[  736.686010][   T10]      fib6_nh_init+0x3d8/0x15b0
[  736.686010][   T10]      ip6_route_info_create+0xf18/0x17d0
[  736.686010][   T10]      addrconf_f6i_alloc+0x244/0x410
[  736.686010][   T10]      ipv6_add_addr+0x411/0x2000
[  736.686010][   T10]      inet6_addr_add+0x30e/0xa40
[  736.686010][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  736.686010][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.686010][   T10]      netlink_rcv_skb+0x130/0x360
[  736.686010][   T10]      netlink_unicast+0x449/0x710
[  736.686010][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.686010][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.686010][   T10]      ___sys_sendmsg+0xee/0x170
[  736.686010][   T10]      __sys_sendmsg+0xcd/0x170
[  736.686010][   T10]      do_syscall_64+0xc6/0x1e0
[  736.686010][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.686010][   T10] 
[  736.688313][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  736.688313][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  736.688313][   T10]      ipv6_find_idev+0x102/0x170
[  736.688313][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  736.688313][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.688313][   T10]      netlink_rcv_skb+0x130/0x360
[  736.688313][   T10]      netlink_unicast+0x449/0x710
[  736.688313][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.688313][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.688313][   T10]      ___sys_sendmsg+0xee/0x170
[  736.688313][   T10]      __sys_sendmsg+0xcd/0x170
[  736.688313][   T10]      do_syscall_64+0xc6/0x1e0
[  736.688313][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.688313][   T10] 
[  736.690088][   T10] ref_tracker: ns1eth2@ffff888004dcc5c0 has 1/3 users at
[  736.690088][   T10]      neigh_parms_alloc+0x1e5/0x510
[  736.690088][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  736.690088][   T10]      ipv6_find_idev+0x102/0x170
[  736.690088][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  736.690088][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.690088][   T10]      netlink_rcv_skb+0x130/0x360
[  736.690088][   T10]      netlink_unicast+0x449/0x710
[  736.690088][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.690088][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.690088][   T10]      ___sys_sendmsg+0xee/0x170
[  736.690088][   T10]      __sys_sendmsg+0xcd/0x170
[  736.690088][   T10]      do_syscall_64+0xc6/0x1e0
[  736.690088][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.690088][   T10] 
[  736.692051][   T10] unregister_netdevice: waiting for ns2eth2 to become free. Usage count = 4
[  736.692350][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  736.692350][   T10]      netdev_get_by_index+0x5e/0x80
[  736.692350][   T10]      fib6_nh_init+0x3d8/0x15b0
[  736.692350][   T10]      ip6_route_info_create+0xf18/0x17d0
[  736.692350][   T10]      addrconf_f6i_alloc+0x244/0x410
[  736.692350][   T10]      ipv6_add_addr+0x411/0x2000
[  736.692350][   T10]      inet6_addr_add+0x30e/0xa40
[  736.692350][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  736.692350][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.692350][   T10]      netlink_rcv_skb+0x130/0x360
[  736.692350][   T10]      netlink_unicast+0x449/0x710
[  736.692350][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.692350][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.692350][   T10]      ___sys_sendmsg+0xee/0x170
[  736.692350][   T10]      __sys_sendmsg+0xcd/0x170
[  736.692350][   T10]      do_syscall_64+0xc6/0x1e0
[  736.692350][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.692350][   T10] 
[  736.694790][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  736.694790][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  736.694790][   T10]      ipv6_find_idev+0x102/0x170
[  736.694790][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  736.694790][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.694790][   T10]      netlink_rcv_skb+0x130/0x360
[  736.694790][   T10]      netlink_unicast+0x449/0x710
[  736.694790][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.694790][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.694790][   T10]      ___sys_sendmsg+0xee/0x170
[  736.694790][   T10]      __sys_sendmsg+0xcd/0x170
[  736.694790][   T10]      do_syscall_64+0xc6/0x1e0
[  736.694790][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.694790][   T10] 
[  736.696823][   T10] ref_tracker: ns2eth2@ffff88803c16c5c0 has 1/3 users at
[  736.696823][   T10]      neigh_parms_alloc+0x1e5/0x510
[  736.696823][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  736.696823][   T10]      ipv6_find_idev+0x102/0x170
[  736.696823][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  736.696823][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.696823][   T10]      netlink_rcv_skb+0x130/0x360
[  736.696823][   T10]      netlink_unicast+0x449/0x710
[  736.696823][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.696823][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.696823][   T10]      ___sys_sendmsg+0xee/0x170
[  736.696823][   T10]      __sys_sendmsg+0xcd/0x170
[  736.696823][   T10]      do_syscall_64+0xc6/0x1e0
[  736.696823][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.696823][   T10] 
[  736.698990][   T10] unregister_netdevice: waiting for ns1eth1 to become free. Usage count = 4
[  736.699285][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  736.699285][   T10]      netdev_get_by_index+0x5e/0x80
[  736.699285][   T10]      fib6_nh_init+0x3d8/0x15b0
[  736.699285][   T10]      ip6_route_info_create+0xf18/0x17d0
[  736.699285][   T10]      addrconf_f6i_alloc+0x244/0x410
[  736.699285][   T10]      ipv6_add_addr+0x411/0x2000
[  736.699285][   T10]      inet6_addr_add+0x30e/0xa40
[  736.699285][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  736.699285][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.699285][   T10]      netlink_rcv_skb+0x130/0x360
[  736.699285][   T10]      netlink_unicast+0x449/0x710
[  736.699285][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.699285][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.699285][   T10]      ___sys_sendmsg+0xee/0x170
[  736.699285][   T10]      __sys_sendmsg+0xcd/0x170
[  736.699285][   T10]      do_syscall_64+0xc6/0x1e0
[  736.699285][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.699285][   T10] 
[  736.701827][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  736.701827][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  736.701827][   T10]      ipv6_find_idev+0x102/0x170
[  736.701827][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  736.701827][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.701827][   T10]      netlink_rcv_skb+0x130/0x360
[  736.701827][   T10]      netlink_unicast+0x449/0x710
[  736.701827][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.701827][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.701827][   T10]      ___sys_sendmsg+0xee/0x170
[  736.701827][   T10]      __sys_sendmsg+0xcd/0x170
[  736.701827][   T10]      do_syscall_64+0xc6/0x1e0
[  736.701827][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.701827][   T10] 
[  736.703788][   T10] ref_tracker: ns1eth1@ffff888007b695c0 has 1/3 users at
[  736.703788][   T10]      neigh_parms_alloc+0x1e5/0x510
[  736.703788][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  736.703788][   T10]      ipv6_find_idev+0x102/0x170
[  736.703788][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  736.703788][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.703788][   T10]      netlink_rcv_skb+0x130/0x360
[  736.703788][   T10]      netlink_unicast+0x449/0x710
[  736.703788][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.703788][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.703788][   T10]      ___sys_sendmsg+0xee/0x170
[  736.703788][   T10]      __sys_sendmsg+0xcd/0x170
[  736.703788][   T10]      do_syscall_64+0xc6/0x1e0
[  736.703788][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.703788][   T10] 
[  736.705939][   T10] unregister_netdevice: waiting for ns2eth1 to become free. Usage count = 4
[  736.706237][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  736.706237][   T10]      netdev_get_by_index+0x5e/0x80
[  736.706237][   T10]      fib6_nh_init+0x3d8/0x15b0
[  736.706237][   T10]      ip6_route_info_create+0xf18/0x17d0
[  736.706237][   T10]      addrconf_f6i_alloc+0x244/0x410
[  736.706237][   T10]      ipv6_add_addr+0x411/0x2000
[  736.706237][   T10]      inet6_addr_add+0x30e/0xa40
[  736.706237][   T10]      inet6_rtm_newaddr+0x560/0x6b0
[  736.706237][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.706237][   T10]      netlink_rcv_skb+0x130/0x360
[  736.706237][   T10]      netlink_unicast+0x449/0x710
[  736.706237][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.706237][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.706237][   T10]      ___sys_sendmsg+0xee/0x170
[  736.706237][   T10]      __sys_sendmsg+0xcd/0x170
[  736.706237][   T10]      do_syscall_64+0xc6/0x1e0
[  736.706237][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.706237][   T10] 
[  736.708861][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  736.708861][   T10]      ipv6_add_dev+0x3ba/0x11c0
[  736.708861][   T10]      ipv6_find_idev+0x102/0x170
[  736.708861][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  736.708861][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.708861][   T10]      netlink_rcv_skb+0x130/0x360
[  736.708861][   T10]      netlink_unicast+0x449/0x710
[  736.708861][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.708861][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.708861][   T10]      ___sys_sendmsg+0xee/0x170
[  736.708861][   T10]      __sys_sendmsg+0xcd/0x170
[  736.708861][   T10]      do_syscall_64+0xc6/0x1e0
[  736.708861][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.708861][   T10] 
[  736.710823][   T10] ref_tracker: ns2eth1@ffff8880058915c0 has 1/3 users at
[  736.710823][   T10]      neigh_parms_alloc+0x1e5/0x510
[  736.710823][   T10]      ipv6_add_dev+0x2fe/0x11c0
[  736.710823][   T10]      ipv6_find_idev+0x102/0x170
[  736.710823][   T10]      inet6_rtm_newaddr+0x37c/0x6b0
[  736.710823][   T10]      rtnetlink_rcv_msg+0x2fb/0xbf0
[  736.710823][   T10]      netlink_rcv_skb+0x130/0x360
[  736.710823][   T10]      netlink_unicast+0x449/0x710
[  736.710823][   T10]      netlink_sendmsg+0x723/0xbe0
[  736.710823][   T10]      ____sys_sendmsg+0x7b2/0xa10
[  736.710823][   T10]      ___sys_sendmsg+0xee/0x170
[  736.710823][   T10]      __sys_sendmsg+0xcd/0x170
[  736.710823][   T10]      do_syscall_64+0xc6/0x1e0
[  736.710823][   T10]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  736.710823][   T10]