[20491.846878][ T7704] unregister_netdevice: waiting for veth0.20 to become free. Usage count = 6
[20491.847377][ T7704] ref_tracker: veth0.20@ffff8880060e45d0 has 1/5 users at
[20491.847377][ T7704]      netdev_get_by_index+0x5e/0x80
[20491.847377][ T7704]      fib6_nh_init+0x3d8/0x15b0
[20491.847377][ T7704]      ip6_route_info_create+0xf18/0x17d0
[20491.847377][ T7704]      ip6_route_add+0x1c/0x140
[20491.847377][ T7704]      addrconf_prefix_route+0x2a6/0x430
[20491.847377][ T7704]      inet6_addr_add+0x4f8/0xa40
[20491.847377][ T7704]      inet6_rtm_newaddr+0x560/0x6b0
[20491.847377][ T7704]      rtnetlink_rcv_msg+0x2fb/0xbf0
[20491.847377][ T7704]      netlink_rcv_skb+0x130/0x360
[20491.847377][ T7704]      netlink_unicast+0x449/0x710
[20491.847377][ T7704]      netlink_sendmsg+0x723/0xbe0
[20491.847377][ T7704]      ____sys_sendmsg+0x7b2/0xa10
[20491.847377][ T7704]      ___sys_sendmsg+0xee/0x170
[20491.847377][ T7704]      __sys_sendmsg+0xcd/0x170
[20491.847377][ T7704]      do_syscall_64+0xc6/0x1e0
[20491.847377][ T7704]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[20491.847377][ T7704] 
[20491.849730][ T7704] ref_tracker: veth0.20@ffff8880060e45d0 has 1/5 users at
[20491.849730][ T7704]      netdev_get_by_index+0x5e/0x80
[20491.849730][ T7704]      fib6_nh_init+0x3d8/0x15b0
[20491.849730][ T7704]      ip6_route_info_create+0xf18/0x17d0
[20491.849730][ T7704]      addrconf_f6i_alloc+0x315/0x560
[20491.849730][ T7704]      ipv6_add_addr+0x411/0x2000
[20491.849730][ T7704]      inet6_addr_add+0x30e/0xa40
[20491.849730][ T7704]      inet6_rtm_newaddr+0x560/0x6b0
[20491.849730][ T7704]      rtnetlink_rcv_msg+0x2fb/0xbf0
[20491.849730][ T7704]      netlink_rcv_skb+0x130/0x360
[20491.849730][ T7704]      netlink_unicast+0x449/0x710
[20491.849730][ T7704]      netlink_sendmsg+0x723/0xbe0
[20491.849730][ T7704]      ____sys_sendmsg+0x7b2/0xa10
[20491.849730][ T7704]      ___sys_sendmsg+0xee/0x170
[20491.849730][ T7704]      __sys_sendmsg+0xcd/0x170
[20491.849730][ T7704]      do_syscall_64+0xc6/0x1e0
[20491.849730][ T7704]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[20491.849730][ T7704] 
[20491.852052][ T7704] ref_tracker: veth0.20@ffff8880060e45d0 has 1/5 users at
[20491.852052][ T7704]      netdev_get_by_index+0x5e/0x80
[20491.852052][ T7704]      fib6_nh_init+0x3d8/0x15b0
[20491.852052][ T7704]      ip6_route_info_create+0xf18/0x17d0
[20491.852052][ T7704]      ip6_route_add+0x1c/0x140
[20491.852052][ T7704]      addrconf_add_mroute+0x1ac/0x2c0
[20491.852052][ T7704]      addrconf_add_dev+0xe2/0x170
[20491.852052][ T7704]      inet6_addr_add+0x12f/0xa40
[20491.852052][ T7704]      inet6_rtm_newaddr+0x560/0x6b0
[20491.852052][ T7704]      rtnetlink_rcv_msg+0x2fb/0xbf0
[20491.852052][ T7704]      netlink_rcv_skb+0x130/0x360
[20491.852052][ T7704]      netlink_unicast+0x449/0x710
[20491.852052][ T7704]      netlink_sendmsg+0x723/0xbe0
[20491.852052][ T7704]      ____sys_sendmsg+0x7b2/0xa10
[20491.852052][ T7704]      ___sys_sendmsg+0xee/0x170
[20491.852052][ T7704]      __sys_sendmsg+0xcd/0x170
[20491.852052][ T7704]      do_syscall_64+0xc6/0x1e0
[20491.852052][ T7704] 
[20491.854335][ T7704] ref_tracker: veth0.20@ffff8880060e45d0 has 1/5 users at
[20491.854335][ T7704]      ipv6_add_dev+0x3b9/0x11c0
[20491.854335][ T7704]      ipv6_find_idev+0x102/0x170
[20491.854335][ T7704]      inet6_rtm_newaddr+0x37c/0x6b0
[20491.854335][ T7704]      rtnetlink_rcv_msg+0x2fb/0xbf0
[20491.854335][ T7704]      netlink_rcv_skb+0x130/0x360
[20491.854335][ T7704]      netlink_unicast+0x449/0x710
[20491.854335][ T7704]      netlink_sendmsg+0x723/0xbe0
[20491.854335][ T7704]      ____sys_sendmsg+0x7b2/0xa10
[20491.854335][ T7704]      ___sys_sendmsg+0xee/0x170
[20491.854335][ T7704]      __sys_sendmsg+0xcd/0x170
[20491.854335][ T7704]      do_syscall_64+0xc6/0x1e0
[20491.854335][ T7704]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[20491.854335][ T7704] 
[20491.856131][ T7704] ref_tracker: veth0.20@ffff8880060e45d0 has 1/5 users at
[20491.856131][ T7704]      neigh_parms_alloc+0x1e5/0x510
[20491.856131][ T7704]      ipv6_add_dev+0x2fd/0x11c0
[20491.856131][ T7704]      ipv6_find_idev+0x102/0x170
[20491.856131][ T7704]      inet6_rtm_newaddr+0x37c/0x6b0
[20491.856131][ T7704]      rtnetlink_rcv_msg+0x2fb/0xbf0
[20491.856131][ T7704]      netlink_rcv_skb+0x130/0x360
[20491.856131][ T7704]      netlink_unicast+0x449/0x710
[20491.856131][ T7704]      netlink_sendmsg+0x723/0xbe0
[20491.856131][ T7704]      ____sys_sendmsg+0x7b2/0xa10
[20491.856131][ T7704]      ___sys_sendmsg+0xee/0x170
[20491.856131][ T7704]      __sys_sendmsg+0xcd/0x170
[20491.856131][ T7704]      do_syscall_64+0xc6/0x1e0
[20491.856131][ T7704]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[20491.856131][ T7704]