======================================
| [ 1051.340434][   T10] veth_A-C: left allmulticast mode
| [ 1051.340584][   T10] veth_A-C: left promiscuous mode
| [ 1051.340859][   T10] br0: port 1(veth_A-C) entered disabled state
| [ 1617.546703][T10779] Initializing XFRM netlink socket
| [ 1872.432087][T12481] unregister_netdevice: waiting for veth_A-R1 to become free. Usage count = 6
[ 1872.432635][T12481] ref_tracker: veth_A-R1@ffff8880098f15e0 has 3/5 users at
[1872.432635][T12481] dst_init (net/core/dst.c:53) 
[1872.432635][T12481] dst_alloc (net/core/dst.c:96) 
[1872.432635][T12481] ip6_dst_alloc (net/ipv6/route.c:343) 
[1872.432635][T12481] ip6_rt_pcpu_alloc (net/ipv6/route.c:1380) 
[1872.432635][T12481] ip6_pol_route (net/ipv6/route.c:1428 net/ipv6/route.c:2265) 
[1872.432635][T12481] fib6_rule_lookup (./include/net/ip6_fib.h:616 net/ipv6/fib6_rules.c:121) 
[1872.432635][T12481] ip6_route_output_flags (net/ipv6/route.c:2637 net/ipv6/route.c:2649) 
[1872.432635][T12481] ip6_dst_lookup_tail.constprop.0 (net/ipv6/ip6_output.c:1147) 
[1872.432635][T12481] ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1251) 
[1872.432635][T12481] udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:165 net/ipv6/ip6_udp_tunnel.c:135) 
[1872.432635][T12481] vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2524 (discriminator 4)) vxlan
[1872.432635][T12481] vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2789) vxlan
[1872.432635][T12481] dev_hard_start_xmit (./include/linux/netdevice.h:4884 ./include/linux/netdevice.h:4898 net/core/dev.c:3579 net/core/dev.c:3595) 
[1872.432635][T12481] __dev_queue_xmit (net/core/dev.h:166 net/core/dev.c:4395) 
[1872.432635][T12481] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
[1872.432635][T12481] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
| [1872.432635][T12481] dev_hard_start_xmit (./include/linux/netdevice.h:4884 ./include/linux/netdevice.h:4898 net/core/dev.c:3579 net/core/dev.c:3595) 
| [1872.432635][T12481] __dev_queue_xmit (net/core/dev.h:166 net/core/dev.c:4395) 
| [1872.432635][T12481] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
| [1872.432635][T12481] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
| [ 1872.432635][T12481]
[ 1872.435626][T12481] ref_tracker: veth_A-R1@ffff8880098f15e0 has 1/5 users at
[1872.435626][T12481] netdev_get_by_index (net/core/dev.c:915) 
[1872.435626][T12481] fib6_nh_init (net/ipv6/route.c:3541) 
[1872.435626][T12481] nh_create_ipv6 (net/ipv4/nexthop.c:2827) 
[1872.435626][T12481] nexthop_create (net/ipv4/nexthop.c:2878) 
[1872.435626][T12481] rtm_new_nexthop (net/ipv4/nexthop.c:2920 net/ipv4/nexthop.c:3206) 
[1872.435626][T12481] rtnetlink_rcv_msg (net/core/rtnetlink.c:6595) 
[1872.435626][T12481] netlink_rcv_skb (net/netlink/af_netlink.c:2564) 
[1872.435626][T12481] netlink_unicast (net/netlink/af_netlink.c:1335 net/netlink/af_netlink.c:1361) 
[1872.435626][T12481] netlink_sendmsg (net/netlink/af_netlink.c:1905) 
[1872.435626][T12481] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[1872.435626][T12481] ___sys_sendmsg (net/socket.c:2640) 
[1872.435626][T12481] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
[1872.435626][T12481] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[1872.435626][T12481] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [1872.435626][T12481] ___sys_sendmsg (net/socket.c:2640) 
| [1872.435626][T12481] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
| [1872.435626][T12481] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [1872.435626][T12481] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [ 1872.435626][T12481]
[ 1872.437684][T12481] ref_tracker: veth_A-R1@ffff8880098f15e0 has 1/5 users at
[1872.437684][T12481] ipv6_add_dev (net/ipv6/addrconf.c:344 net/ipv6/addrconf.c:409) 
[1872.437684][T12481] addrconf_notify (net/ipv6/addrconf.c:3653) 
[1872.437684][T12481] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) 
[1872.437684][T12481] register_netdevice (./include/linux/notifier.h:207 net/core/dev.c:10409) 
[1872.437684][T12481] veth_newlink (drivers/net/veth.c:1860) 
[1872.437684][T12481] rtnl_newlink_create (net/core/rtnetlink.c:3510) 
[1872.437684][T12481] __rtnl_newlink (net/core/rtnetlink.c:3730) 
[1872.437684][T12481] rtnl_newlink (net/core/rtnetlink.c:3744) 
[1872.437684][T12481] rtnetlink_rcv_msg (net/core/rtnetlink.c:6595) 
[1872.437684][T12481] netlink_rcv_skb (net/netlink/af_netlink.c:2564) 
[1872.437684][T12481] netlink_unicast (net/netlink/af_netlink.c:1335 net/netlink/af_netlink.c:1361) 
[1872.437684][T12481] netlink_sendmsg (net/netlink/af_netlink.c:1905) 
[1872.437684][T12481] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[1872.437684][T12481] ___sys_sendmsg (net/socket.c:2640) 
[1872.437684][T12481] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
[1872.437684][T12481] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [1872.437684][T12481] ___sys_sendmsg (net/socket.c:2640) 
| [1872.437684][T12481] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
| [1872.437684][T12481] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [ 1872.437684][T12481]
| [ 1882.513000][T12481] unregister_netdevice: waiting for veth_A-R1 to become free. Usage count = 6
[ 1882.513508][T12481] ref_tracker: veth_A-R1@ffff8880098f15e0 has 3/5 users at
[1882.513508][T12481] dst_init (net/core/dst.c:53) 
[1882.513508][T12481] dst_alloc (net/core/dst.c:96) 
[1882.513508][T12481] ip6_dst_alloc (net/ipv6/route.c:343) 
[1882.513508][T12481] ip6_rt_pcpu_alloc (net/ipv6/route.c:1380) 
[1882.513508][T12481] ip6_pol_route (net/ipv6/route.c:1428 net/ipv6/route.c:2265) 
[1882.513508][T12481] fib6_rule_lookup (./include/net/ip6_fib.h:616 net/ipv6/fib6_rules.c:121) 
[1882.513508][T12481] ip6_route_output_flags (net/ipv6/route.c:2637 net/ipv6/route.c:2649) 
[1882.513508][T12481] ip6_dst_lookup_tail.constprop.0 (net/ipv6/ip6_output.c:1147) 
[1882.513508][T12481] ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1251) 
[1882.513508][T12481] udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:165 net/ipv6/ip6_udp_tunnel.c:135) 
[1882.513508][T12481] vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2524 (discriminator 4)) vxlan
[1882.513508][T12481] vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2789) vxlan
[1882.513508][T12481] dev_hard_start_xmit (./include/linux/netdevice.h:4884 ./include/linux/netdevice.h:4898 net/core/dev.c:3579 net/core/dev.c:3595) 
[1882.513508][T12481] __dev_queue_xmit (net/core/dev.h:166 net/core/dev.c:4395) 
[1882.513508][T12481] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
[1882.513508][T12481] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
| [1882.513508][T12481] dev_hard_start_xmit (./include/linux/netdevice.h:4884 ./include/linux/netdevice.h:4898 net/core/dev.c:3579 net/core/dev.c:3595) 
| [1882.513508][T12481] __dev_queue_xmit (net/core/dev.h:166 net/core/dev.c:4395) 
| [1882.513508][T12481] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
| [1882.513508][T12481] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
| [ 1882.513508][T12481]
[ 1882.515880][T12481] ref_tracker: veth_A-R1@ffff8880098f15e0 has 1/5 users at
[1882.515880][T12481] netdev_get_by_index (net/core/dev.c:915) 
[1882.515880][T12481] fib6_nh_init (net/ipv6/route.c:3541) 
[1882.515880][T12481] nh_create_ipv6 (net/ipv4/nexthop.c:2827) 
[1882.515880][T12481] nexthop_create (net/ipv4/nexthop.c:2878) 
[1882.515880][T12481] rtm_new_nexthop (net/ipv4/nexthop.c:2920 net/ipv4/nexthop.c:3206) 
[1882.515880][T12481] rtnetlink_rcv_msg (net/core/rtnetlink.c:6595) 
[1882.515880][T12481] netlink_rcv_skb (net/netlink/af_netlink.c:2564) 
[1882.515880][T12481] netlink_unicast (net/netlink/af_netlink.c:1335 net/netlink/af_netlink.c:1361) 
[1882.515880][T12481] netlink_sendmsg (net/netlink/af_netlink.c:1905) 
[1882.515880][T12481] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[1882.515880][T12481] ___sys_sendmsg (net/socket.c:2640) 
[1882.515880][T12481] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
[1882.515880][T12481] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[1882.515880][T12481] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [1882.515880][T12481] ___sys_sendmsg (net/socket.c:2640) 
| [1882.515880][T12481] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
| [1882.515880][T12481] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [1882.515880][T12481] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [ 1882.515880][T12481]
[ 1882.518076][T12481] ref_tracker: veth_A-R1@ffff8880098f15e0 has 1/5 users at
[1882.518076][T12481] ipv6_add_dev (net/ipv6/addrconf.c:344 net/ipv6/addrconf.c:409) 
[1882.518076][T12481] addrconf_notify (net/ipv6/addrconf.c:3653) 
[1882.518076][T12481] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) 
[1882.518076][T12481] register_netdevice (./include/linux/notifier.h:207 net/core/dev.c:10409) 
[1882.518076][T12481] veth_newlink (drivers/net/veth.c:1860) 
[1882.518076][T12481] rtnl_newlink_create (net/core/rtnetlink.c:3510) 
[1882.518076][T12481] __rtnl_newlink (net/core/rtnetlink.c:3730) 
[1882.518076][T12481] rtnl_newlink (net/core/rtnetlink.c:3744) 
[1882.518076][T12481] rtnetlink_rcv_msg (net/core/rtnetlink.c:6595) 
[1882.518076][T12481] netlink_rcv_skb (net/netlink/af_netlink.c:2564) 
[1882.518076][T12481] netlink_unicast (net/netlink/af_netlink.c:1335 net/netlink/af_netlink.c:1361) 
[1882.518076][T12481] netlink_sendmsg (net/netlink/af_netlink.c:1905) 
[1882.518076][T12481] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[1882.518076][T12481] ___sys_sendmsg (net/socket.c:2640) 
[1882.518076][T12481] __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