======================================
| [ 1034.106177][   T75] veth_A-C: left allmulticast mode
| [ 1034.106392][   T75] veth_A-C: left promiscuous mode
| [ 1034.106680][   T75] br0: port 1(veth_A-C) entered disabled state
| [ 1589.342278][T10778] Initializing XFRM netlink socket
| [ 1834.614263][T12486] unregister_netdevice: waiting for veth_A-R1 to become free. Usage count = 6
[ 1834.614784][T12486] ref_tracker: veth_A-R1@ffff888003a1c5e0 has 3/5 users at
[1834.614784][T12486] dst_init (net/core/dst.c:53) 
[1834.614784][T12486] dst_alloc (net/core/dst.c:96) 
[1834.614784][T12486] ip6_dst_alloc (net/ipv6/route.c:343) 
[1834.614784][T12486] ip6_rt_pcpu_alloc (net/ipv6/route.c:1380) 
[1834.614784][T12486] ip6_pol_route (net/ipv6/route.c:1428 net/ipv6/route.c:2265) 
[1834.614784][T12486] fib6_rule_lookup (./include/net/ip6_fib.h:616 net/ipv6/fib6_rules.c:121) 
[1834.614784][T12486] ip6_route_output_flags (net/ipv6/route.c:2637 net/ipv6/route.c:2649) 
[1834.614784][T12486] ip6_dst_lookup_tail.constprop.0 (net/ipv6/ip6_output.c:1147) 
[1834.614784][T12486] ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1251) 
[1834.614784][T12486] udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:165 net/ipv6/ip6_udp_tunnel.c:135) 
[1834.614784][T12486] vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2524 (discriminator 4)) vxlan
[1834.614784][T12486] vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2789) vxlan
[1834.614784][T12486] dev_hard_start_xmit (./include/linux/netdevice.h:4882 ./include/linux/netdevice.h:4896 net/core/dev.c:3578 net/core/dev.c:3594) 
[1834.614784][T12486] __dev_queue_xmit (net/core/dev.h:166 net/core/dev.c:4394) 
[1834.614784][T12486] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
[1834.614784][T12486] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
| [1834.614784][T12486] dev_hard_start_xmit (./include/linux/netdevice.h:4882 ./include/linux/netdevice.h:4896 net/core/dev.c:3578 net/core/dev.c:3594) 
| [1834.614784][T12486] __dev_queue_xmit (net/core/dev.h:166 net/core/dev.c:4394) 
| [1834.614784][T12486] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
| [1834.614784][T12486] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
| [ 1834.614784][T12486]
[ 1834.617575][T12486] ref_tracker: veth_A-R1@ffff888003a1c5e0 has 1/5 users at
[1834.617575][T12486] netdev_get_by_index (net/core/dev.c:914) 
[1834.617575][T12486] fib6_nh_init (net/ipv6/route.c:3541) 
[1834.617575][T12486] nh_create_ipv6 (net/ipv4/nexthop.c:2827) 
[1834.617575][T12486] nexthop_create (net/ipv4/nexthop.c:2878) 
[1834.617575][T12486] rtm_new_nexthop (net/ipv4/nexthop.c:2920 net/ipv4/nexthop.c:3206) 
[1834.617575][T12486] rtnetlink_rcv_msg (net/core/rtnetlink.c:6595) 
[1834.617575][T12486] netlink_rcv_skb (net/netlink/af_netlink.c:2564) 
[1834.617575][T12486] netlink_unicast (net/netlink/af_netlink.c:1335 net/netlink/af_netlink.c:1361) 
[1834.617575][T12486] netlink_sendmsg (net/netlink/af_netlink.c:1905) 
[1834.617575][T12486] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[1834.617575][T12486] ___sys_sendmsg (net/socket.c:2640) 
[1834.617575][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
[1834.617575][T12486] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[1834.617575][T12486] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [1834.617575][T12486] ___sys_sendmsg (net/socket.c:2640) 
| [1834.617575][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
| [1834.617575][T12486] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [1834.617575][T12486] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [ 1834.617575][T12486]
[ 1834.619569][T12486] ref_tracker: veth_A-R1@ffff888003a1c5e0 has 1/5 users at
[1834.619569][T12486] ipv6_add_dev (net/ipv6/addrconf.c:344 net/ipv6/addrconf.c:409) 
[1834.619569][T12486] addrconf_notify (net/ipv6/addrconf.c:3653) 
[1834.619569][T12486] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) 
[1834.619569][T12486] register_netdevice (./include/linux/notifier.h:207 net/core/dev.c:10408) 
[1834.619569][T12486] veth_newlink (drivers/net/veth.c:1860) 
[1834.619569][T12486] rtnl_newlink_create (net/core/rtnetlink.c:3510) 
[1834.619569][T12486] __rtnl_newlink (net/core/rtnetlink.c:3730) 
[1834.619569][T12486] rtnl_newlink (net/core/rtnetlink.c:3744) 
[1834.619569][T12486] rtnetlink_rcv_msg (net/core/rtnetlink.c:6595) 
[1834.619569][T12486] netlink_rcv_skb (net/netlink/af_netlink.c:2564) 
[1834.619569][T12486] netlink_unicast (net/netlink/af_netlink.c:1335 net/netlink/af_netlink.c:1361) 
[1834.619569][T12486] netlink_sendmsg (net/netlink/af_netlink.c:1905) 
[1834.619569][T12486] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[1834.619569][T12486] ___sys_sendmsg (net/socket.c:2640) 
[1834.619569][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
[1834.619569][T12486] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [1834.619569][T12486] ___sys_sendmsg (net/socket.c:2640) 
| [1834.619569][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
| [1834.619569][T12486] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [ 1834.619569][T12486]
| [ 1844.822256][T12486] unregister_netdevice: waiting for veth_A-R1 to become free. Usage count = 6
[ 1844.822694][T12486] ref_tracker: veth_A-R1@ffff888003a1c5e0 has 3/5 users at
[1844.822694][T12486] dst_init (net/core/dst.c:53) 
[1844.822694][T12486] dst_alloc (net/core/dst.c:96) 
[1844.822694][T12486] ip6_dst_alloc (net/ipv6/route.c:343) 
[1844.822694][T12486] ip6_rt_pcpu_alloc (net/ipv6/route.c:1380) 
[1844.822694][T12486] ip6_pol_route (net/ipv6/route.c:1428 net/ipv6/route.c:2265) 
[1844.822694][T12486] fib6_rule_lookup (./include/net/ip6_fib.h:616 net/ipv6/fib6_rules.c:121) 
[1844.822694][T12486] ip6_route_output_flags (net/ipv6/route.c:2637 net/ipv6/route.c:2649) 
[1844.822694][T12486] ip6_dst_lookup_tail.constprop.0 (net/ipv6/ip6_output.c:1147) 
[1844.822694][T12486] ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1251) 
[1844.822694][T12486] udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:165 net/ipv6/ip6_udp_tunnel.c:135) 
[1844.822694][T12486] vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2524 (discriminator 4)) vxlan
[1844.822694][T12486] vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2789) vxlan
[1844.822694][T12486] dev_hard_start_xmit (./include/linux/netdevice.h:4882 ./include/linux/netdevice.h:4896 net/core/dev.c:3578 net/core/dev.c:3594) 
[1844.822694][T12486] __dev_queue_xmit (net/core/dev.h:166 net/core/dev.c:4394) 
[1844.822694][T12486] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
[1844.822694][T12486] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
| [1844.822694][T12486] dev_hard_start_xmit (./include/linux/netdevice.h:4882 ./include/linux/netdevice.h:4896 net/core/dev.c:3578 net/core/dev.c:3594) 
| [1844.822694][T12486] __dev_queue_xmit (net/core/dev.h:166 net/core/dev.c:4394) 
| [1844.822694][T12486] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
| [1844.822694][T12486] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
| [ 1844.822694][T12486]
[ 1844.825352][T12486] ref_tracker: veth_A-R1@ffff888003a1c5e0 has 1/5 users at
[1844.825352][T12486] netdev_get_by_index (net/core/dev.c:914) 
[1844.825352][T12486] fib6_nh_init (net/ipv6/route.c:3541) 
[1844.825352][T12486] nh_create_ipv6 (net/ipv4/nexthop.c:2827) 
[1844.825352][T12486] nexthop_create (net/ipv4/nexthop.c:2878) 
[1844.825352][T12486] rtm_new_nexthop (net/ipv4/nexthop.c:2920 net/ipv4/nexthop.c:3206) 
[1844.825352][T12486] rtnetlink_rcv_msg (net/core/rtnetlink.c:6595) 
[1844.825352][T12486] netlink_rcv_skb (net/netlink/af_netlink.c:2564) 
[1844.825352][T12486] netlink_unicast (net/netlink/af_netlink.c:1335 net/netlink/af_netlink.c:1361) 
[1844.825352][T12486] netlink_sendmsg (net/netlink/af_netlink.c:1905) 
[1844.825352][T12486] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[1844.825352][T12486] ___sys_sendmsg (net/socket.c:2640) 
[1844.825352][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
[1844.825352][T12486] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[1844.825352][T12486] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [1844.825352][T12486] ___sys_sendmsg (net/socket.c:2640) 
| [1844.825352][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
| [1844.825352][T12486] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [1844.825352][T12486] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [ 1844.825352][T12486]
[ 1844.827617][T12486] ref_tracker: veth_A-R1@ffff888003a1c5e0 has 1/5 users at
[1844.827617][T12486] ipv6_add_dev (net/ipv6/addrconf.c:344 net/ipv6/addrconf.c:409) 
[1844.827617][T12486] addrconf_notify (net/ipv6/addrconf.c:3653) 
[1844.827617][T12486] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) 
[1844.827617][T12486] register_netdevice (./include/linux/notifier.h:207 net/core/dev.c:10408) 
[1844.827617][T12486] veth_newlink (drivers/net/veth.c:1860) 
[1844.827617][T12486] rtnl_newlink_create (net/core/rtnetlink.c:3510) 
[1844.827617][T12486] __rtnl_newlink (net/core/rtnetlink.c:3730) 
[1844.827617][T12486] rtnl_newlink (net/core/rtnetlink.c:3744) 
[1844.827617][T12486] rtnetlink_rcv_msg (net/core/rtnetlink.c:6595) 
[1844.827617][T12486] netlink_rcv_skb (net/netlink/af_netlink.c:2564) 
[1844.827617][T12486] netlink_unicast (net/netlink/af_netlink.c:1335 net/netlink/af_netlink.c:1361) 
[1844.827617][T12486] netlink_sendmsg (net/netlink/af_netlink.c:1905) 
[1844.827617][T12486] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[1844.827617][T12486] ___sys_sendmsg (net/socket.c:2640) 
[1844.827617][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
[1844.827617][T12486] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [1844.827617][T12486] ___sys_sendmsg (net/socket.c:2640) 
| [1844.827617][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
| [1844.827617][T12486] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [ 1844.827617][T12486]
| [ 1855.055420][T12486] unregister_netdevice: waiting for veth_A-R1 to become free. Usage count = 6
[ 1855.055845][T12486] ref_tracker: veth_A-R1@ffff888003a1c5e0 has 3/5 users at
[1855.055845][T12486] dst_init (net/core/dst.c:53) 
[1855.055845][T12486] dst_alloc (net/core/dst.c:96) 
[1855.055845][T12486] ip6_dst_alloc (net/ipv6/route.c:343) 
[1855.055845][T12486] ip6_rt_pcpu_alloc (net/ipv6/route.c:1380) 
[1855.055845][T12486] ip6_pol_route (net/ipv6/route.c:1428 net/ipv6/route.c:2265) 
[1855.055845][T12486] fib6_rule_lookup (./include/net/ip6_fib.h:616 net/ipv6/fib6_rules.c:121) 
[1855.055845][T12486] ip6_route_output_flags (net/ipv6/route.c:2637 net/ipv6/route.c:2649) 
[1855.055845][T12486] ip6_dst_lookup_tail.constprop.0 (net/ipv6/ip6_output.c:1147) 
[1855.055845][T12486] ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1251) 
[1855.055845][T12486] udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:165 net/ipv6/ip6_udp_tunnel.c:135) 
[1855.055845][T12486] vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2524 (discriminator 4)) vxlan
[1855.055845][T12486] vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2789) vxlan
[1855.055845][T12486] dev_hard_start_xmit (./include/linux/netdevice.h:4882 ./include/linux/netdevice.h:4896 net/core/dev.c:3578 net/core/dev.c:3594) 
[1855.055845][T12486] __dev_queue_xmit (net/core/dev.h:166 net/core/dev.c:4394) 
[1855.055845][T12486] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
[1855.055845][T12486] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
| [1855.055845][T12486] dev_hard_start_xmit (./include/linux/netdevice.h:4882 ./include/linux/netdevice.h:4896 net/core/dev.c:3578 net/core/dev.c:3594) 
| [1855.055845][T12486] __dev_queue_xmit (net/core/dev.h:166 net/core/dev.c:4394) 
| [1855.055845][T12486] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
| [1855.055845][T12486] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
| [ 1855.055845][T12486]
[ 1855.058441][T12486] ref_tracker: veth_A-R1@ffff888003a1c5e0 has 1/5 users at
[1855.058441][T12486] netdev_get_by_index (net/core/dev.c:914) 
[1855.058441][T12486] fib6_nh_init (net/ipv6/route.c:3541) 
[1855.058441][T12486] nh_create_ipv6 (net/ipv4/nexthop.c:2827) 
[1855.058441][T12486] nexthop_create (net/ipv4/nexthop.c:2878) 
[1855.058441][T12486] rtm_new_nexthop (net/ipv4/nexthop.c:2920 net/ipv4/nexthop.c:3206) 
[1855.058441][T12486] rtnetlink_rcv_msg (net/core/rtnetlink.c:6595) 
[1855.058441][T12486] netlink_rcv_skb (net/netlink/af_netlink.c:2564) 
[1855.058441][T12486] netlink_unicast (net/netlink/af_netlink.c:1335 net/netlink/af_netlink.c:1361) 
[1855.058441][T12486] netlink_sendmsg (net/netlink/af_netlink.c:1905) 
[1855.058441][T12486] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[1855.058441][T12486] ___sys_sendmsg (net/socket.c:2640) 
[1855.058441][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
[1855.058441][T12486] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[1855.058441][T12486] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [1855.058441][T12486] ___sys_sendmsg (net/socket.c:2640) 
| [1855.058441][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
| [1855.058441][T12486] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [1855.058441][T12486] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [ 1855.058441][T12486]
[ 1855.060551][T12486] ref_tracker: veth_A-R1@ffff888003a1c5e0 has 1/5 users at
[1855.060551][T12486] ipv6_add_dev (net/ipv6/addrconf.c:344 net/ipv6/addrconf.c:409) 
[1855.060551][T12486] addrconf_notify (net/ipv6/addrconf.c:3653) 
[1855.060551][T12486] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) 
[1855.060551][T12486] register_netdevice (./include/linux/notifier.h:207 net/core/dev.c:10408) 
[1855.060551][T12486] veth_newlink (drivers/net/veth.c:1860) 
[1855.060551][T12486] rtnl_newlink_create (net/core/rtnetlink.c:3510) 
[1855.060551][T12486] __rtnl_newlink (net/core/rtnetlink.c:3730) 
[1855.060551][T12486] rtnl_newlink (net/core/rtnetlink.c:3744) 
[1855.060551][T12486] rtnetlink_rcv_msg (net/core/rtnetlink.c:6595) 
[1855.060551][T12486] netlink_rcv_skb (net/netlink/af_netlink.c:2564) 
[1855.060551][T12486] netlink_unicast (net/netlink/af_netlink.c:1335 net/netlink/af_netlink.c:1361) 
[1855.060551][T12486] netlink_sendmsg (net/netlink/af_netlink.c:1905) 
[1855.060551][T12486] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[1855.060551][T12486] ___sys_sendmsg (net/socket.c:2640) 
[1855.060551][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
[1855.060551][T12486] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [1855.060551][T12486] ___sys_sendmsg (net/socket.c:2640) 
| [1855.060551][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
| [1855.060551][T12486] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [ 1855.060551][T12486]
| [ 1865.209264][T12486] unregister_netdevice: waiting for veth_A-R1 to become free. Usage count = 6
[ 1865.209636][T12486] ref_tracker: veth_A-R1@ffff888003a1c5e0 has 3/5 users at
[1865.209636][T12486] dst_init (net/core/dst.c:53) 
[1865.209636][T12486] dst_alloc (net/core/dst.c:96) 
[1865.209636][T12486] ip6_dst_alloc (net/ipv6/route.c:343) 
[1865.209636][T12486] ip6_rt_pcpu_alloc (net/ipv6/route.c:1380) 
[1865.209636][T12486] ip6_pol_route (net/ipv6/route.c:1428 net/ipv6/route.c:2265) 
[1865.209636][T12486] fib6_rule_lookup (./include/net/ip6_fib.h:616 net/ipv6/fib6_rules.c:121) 
[1865.209636][T12486] ip6_route_output_flags (net/ipv6/route.c:2637 net/ipv6/route.c:2649) 
[1865.209636][T12486] ip6_dst_lookup_tail.constprop.0 (net/ipv6/ip6_output.c:1147) 
[1865.209636][T12486] ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1251) 
[1865.209636][T12486] udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:165 net/ipv6/ip6_udp_tunnel.c:135) 
[1865.209636][T12486] vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2524 (discriminator 4)) vxlan
[1865.209636][T12486] vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2789) vxlan
[1865.209636][T12486] dev_hard_start_xmit (./include/linux/netdevice.h:4882 ./include/linux/netdevice.h:4896 net/core/dev.c:3578 net/core/dev.c:3594) 
[1865.209636][T12486] __dev_queue_xmit (net/core/dev.h:166 net/core/dev.c:4394) 
[1865.209636][T12486] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
[1865.209636][T12486] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
| [1865.209636][T12486] dev_hard_start_xmit (./include/linux/netdevice.h:4882 ./include/linux/netdevice.h:4896 net/core/dev.c:3578 net/core/dev.c:3594) 
| [1865.209636][T12486] __dev_queue_xmit (net/core/dev.h:166 net/core/dev.c:4394) 
| [1865.209636][T12486] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
| [1865.209636][T12486] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
| [ 1865.209636][T12486]
[ 1865.211951][T12486] ref_tracker: veth_A-R1@ffff888003a1c5e0 has 1/5 users at
[1865.211951][T12486] netdev_get_by_index (net/core/dev.c:914) 
[1865.211951][T12486] fib6_nh_init (net/ipv6/route.c:3541) 
[1865.211951][T12486] nh_create_ipv6 (net/ipv4/nexthop.c:2827) 
[1865.211951][T12486] nexthop_create (net/ipv4/nexthop.c:2878) 
[1865.211951][T12486] rtm_new_nexthop (net/ipv4/nexthop.c:2920 net/ipv4/nexthop.c:3206) 
[1865.211951][T12486] rtnetlink_rcv_msg (net/core/rtnetlink.c:6595) 
[1865.211951][T12486] netlink_rcv_skb (net/netlink/af_netlink.c:2564) 
[1865.211951][T12486] netlink_unicast (net/netlink/af_netlink.c:1335 net/netlink/af_netlink.c:1361) 
[1865.211951][T12486] netlink_sendmsg (net/netlink/af_netlink.c:1905) 
[1865.211951][T12486] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[1865.211951][T12486] ___sys_sendmsg (net/socket.c:2640) 
[1865.211951][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
[1865.211951][T12486] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[1865.211951][T12486] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [1865.211951][T12486] ___sys_sendmsg (net/socket.c:2640) 
| [1865.211951][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
| [1865.211951][T12486] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [1865.211951][T12486] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [ 1865.211951][T12486]
[ 1865.214031][T12486] ref_tracker: veth_A-R1@ffff888003a1c5e0 has 1/5 users at
[1865.214031][T12486] ipv6_add_dev (net/ipv6/addrconf.c:344 net/ipv6/addrconf.c:409) 
[1865.214031][T12486] addrconf_notify (net/ipv6/addrconf.c:3653) 
[1865.214031][T12486] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) 
[1865.214031][T12486] register_netdevice (./include/linux/notifier.h:207 net/core/dev.c:10408) 
[1865.214031][T12486] veth_newlink (drivers/net/veth.c:1860) 
[1865.214031][T12486] rtnl_newlink_create (net/core/rtnetlink.c:3510) 
[1865.214031][T12486] __rtnl_newlink (net/core/rtnetlink.c:3730) 
[1865.214031][T12486] rtnl_newlink (net/core/rtnetlink.c:3744) 
[1865.214031][T12486] rtnetlink_rcv_msg (net/core/rtnetlink.c:6595) 
[1865.214031][T12486] netlink_rcv_skb (net/netlink/af_netlink.c:2564) 
[1865.214031][T12486] netlink_unicast (net/netlink/af_netlink.c:1335 net/netlink/af_netlink.c:1361) 
[1865.214031][T12486] netlink_sendmsg (net/netlink/af_netlink.c:1905) 
[1865.214031][T12486] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[1865.214031][T12486] ___sys_sendmsg (net/socket.c:2640) 
[1865.214031][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
[1865.214031][T12486] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [1865.214031][T12486] ___sys_sendmsg (net/socket.c:2640) 
| [1865.214031][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
| [1865.214031][T12486] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [ 1865.214031][T12486]
| [ 1875.310320][T12486] unregister_netdevice: waiting for veth_A-R1 to become free. Usage count = 6
[ 1875.310803][T12486] ref_tracker: veth_A-R1@ffff888003a1c5e0 has 3/5 users at
[1875.310803][T12486] dst_init (net/core/dst.c:53) 
[1875.310803][T12486] dst_alloc (net/core/dst.c:96) 
[1875.310803][T12486] ip6_dst_alloc (net/ipv6/route.c:343) 
[1875.310803][T12486] ip6_rt_pcpu_alloc (net/ipv6/route.c:1380) 
[1875.310803][T12486] ip6_pol_route (net/ipv6/route.c:1428 net/ipv6/route.c:2265) 
[1875.310803][T12486] fib6_rule_lookup (./include/net/ip6_fib.h:616 net/ipv6/fib6_rules.c:121) 
[1875.310803][T12486] ip6_route_output_flags (net/ipv6/route.c:2637 net/ipv6/route.c:2649) 
[1875.310803][T12486] ip6_dst_lookup_tail.constprop.0 (net/ipv6/ip6_output.c:1147) 
[1875.310803][T12486] ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1251) 
[1875.310803][T12486] udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:165 net/ipv6/ip6_udp_tunnel.c:135) 
[1875.310803][T12486] vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2524 (discriminator 4)) vxlan
[1875.310803][T12486] vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2789) vxlan
[1875.310803][T12486] dev_hard_start_xmit (./include/linux/netdevice.h:4882 ./include/linux/netdevice.h:4896 net/core/dev.c:3578 net/core/dev.c:3594) 
[1875.310803][T12486] __dev_queue_xmit (net/core/dev.h:166 net/core/dev.c:4394) 
[1875.310803][T12486] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
[1875.310803][T12486] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
| [1875.310803][T12486] dev_hard_start_xmit (./include/linux/netdevice.h:4882 ./include/linux/netdevice.h:4896 net/core/dev.c:3578 net/core/dev.c:3594) 
| [1875.310803][T12486] __dev_queue_xmit (net/core/dev.h:166 net/core/dev.c:4394) 
| [1875.310803][T12486] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
| [1875.310803][T12486] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
| [ 1875.310803][T12486]
[ 1875.313459][T12486] ref_tracker: veth_A-R1@ffff888003a1c5e0 has 1/5 users at
[1875.313459][T12486] netdev_get_by_index (net/core/dev.c:914) 
[1875.313459][T12486] fib6_nh_init (net/ipv6/route.c:3541) 
[1875.313459][T12486] nh_create_ipv6 (net/ipv4/nexthop.c:2827) 
[1875.313459][T12486] nexthop_create (net/ipv4/nexthop.c:2878) 
[1875.313459][T12486] rtm_new_nexthop (net/ipv4/nexthop.c:2920 net/ipv4/nexthop.c:3206) 
[1875.313459][T12486] rtnetlink_rcv_msg (net/core/rtnetlink.c:6595) 
[1875.313459][T12486] netlink_rcv_skb (net/netlink/af_netlink.c:2564) 
[1875.313459][T12486] netlink_unicast (net/netlink/af_netlink.c:1335 net/netlink/af_netlink.c:1361) 
[1875.313459][T12486] netlink_sendmsg (net/netlink/af_netlink.c:1905) 
[1875.313459][T12486] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[1875.313459][T12486] ___sys_sendmsg (net/socket.c:2640) 
[1875.313459][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
[1875.313459][T12486] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[1875.313459][T12486] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [1875.313459][T12486] ___sys_sendmsg (net/socket.c:2640) 
| [1875.313459][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
| [1875.313459][T12486] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [1875.313459][T12486] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [ 1875.313459][T12486]
[ 1875.315798][T12486] ref_tracker: veth_A-R1@ffff888003a1c5e0 has 1/5 users at
[1875.315798][T12486] ipv6_add_dev (net/ipv6/addrconf.c:344 net/ipv6/addrconf.c:409) 
[1875.315798][T12486] addrconf_notify (net/ipv6/addrconf.c:3653) 
[1875.315798][T12486] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) 
[1875.315798][T12486] register_netdevice (./include/linux/notifier.h:207 net/core/dev.c:10408) 
[1875.315798][T12486] veth_newlink (drivers/net/veth.c:1860) 
[1875.315798][T12486] rtnl_newlink_create (net/core/rtnetlink.c:3510) 
[1875.315798][T12486] __rtnl_newlink (net/core/rtnetlink.c:3730) 
[1875.315798][T12486] rtnl_newlink (net/core/rtnetlink.c:3744) 
[1875.315798][T12486] rtnetlink_rcv_msg (net/core/rtnetlink.c:6595) 
[1875.315798][T12486] netlink_rcv_skb (net/netlink/af_netlink.c:2564) 
[1875.315798][T12486] netlink_unicast (net/netlink/af_netlink.c:1335 net/netlink/af_netlink.c:1361) 
[1875.315798][T12486] netlink_sendmsg (net/netlink/af_netlink.c:1905) 
[1875.315798][T12486] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[1875.315798][T12486] ___sys_sendmsg (net/socket.c:2640) 
[1875.315798][T12486] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 


Finger prints:
dst_init:dst_alloc:ip6_dst_alloc:ip6_rt_pcpu_alloc:ip6_pol_route
dev_hard_start_xmit:__dev_queue_xmit:ip6_finish_output2:ip6_finish_output:netdev_get_by_index
___sys_sendmsg:__sys_sendmsg:do_syscall_64:ipv6_add_dev:addrconf_notify
___sys_sendmsg:__sys_sendmsg:do_syscall_64:dst_init:dst_alloc
dev_hard_start_xmit:__dev_queue_xmit:ip6_finish_output2:ip6_finish_output:netdev_get_by_index
___sys_sendmsg:__sys_sendmsg:do_syscall_64:ipv6_add_dev:addrconf_notify
___sys_sendmsg:__sys_sendmsg:do_syscall_64:dst_init:dst_alloc
dev_hard_start_xmit:__dev_queue_xmit:ip6_finish_output2:ip6_finish_output:netdev_get_by_index
___sys_sendmsg:__sys_sendmsg:do_syscall_64:ipv6_add_dev:addrconf_notify
___sys_sendmsg:__sys_sendmsg:do_syscall_64:dst_init:dst_alloc
dev_hard_start_xmit:__dev_queue_xmit:ip6_finish_output2:ip6_finish_output:netdev_get_by_index
___sys_sendmsg:__sys_sendmsg:do_syscall_64:ipv6_add_dev:addrconf_notify
___sys_sendmsg:__sys_sendmsg:do_syscall_64:dst_init:dst_alloc
dev_hard_start_xmit:__dev_queue_xmit:ip6_finish_output2:ip6_finish_output:netdev_get_by_index
___sys_sendmsg:__sys_sendmsg:do_syscall_64:ipv6_add_dev:addrconf_notify