======================================
| [ 3280.790738][   T75] veth_A-C (unregistering): left promiscuous mode
| [ 3293.071373][T14789] geneve_a: left promiscuous mode
| [ 3298.228936][T14802] ovs_br0: left promiscuous mode
| [ 4172.484753][T19304] Initializing XFRM netlink socket
| [ 4669.329739][T21696] unregister_netdevice: waiting for veth_A-R1 to become free. Usage count = 6
[ 4669.330285][T21696] ref_tracker: veth_A-R1@ffff8880066295e8 has 1/5 users at
[4669.330285][T21696] dst_init (net/core/dst.c:53) 
[4669.330285][T21696] dst_alloc (net/core/dst.c:96) 
[4669.330285][T21696] ip6_dst_alloc (net/ipv6/route.c:342) 
[4669.330285][T21696] ip6_rt_pcpu_alloc (net/ipv6/route.c:1381) 
[4669.330285][T21696] ip6_pol_route (net/ipv6/route.c:1430 net/ipv6/route.c:2267) 
[4669.330285][T21696] fib6_rule_lookup (./include/net/ip6_fib.h:616 net/ipv6/fib6_rules.c:122) 
[4669.330285][T21696] ip6_route_output_flags (net/ipv6/route.c:2639 net/ipv6/route.c:2651) 
[4669.330285][T21696] ip6_dst_lookup_tail.constprop.0 (net/ipv6/ip6_output.c:1156) 
[4669.330285][T21696] ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1260) 
[4669.330285][T21696] udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:165 net/ipv6/ip6_udp_tunnel.c:135) 
[4669.330285][T21696] vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2530 (discriminator 4)) vxlan
[4669.330285][T21696] vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2795) vxlan
[4669.330285][T21696] dev_hard_start_xmit (./include/linux/netdevice.h:4924 ./include/linux/netdevice.h:4933 net/core/dev.c:3588 net/core/dev.c:3604) 
[4669.330285][T21696] __dev_queue_xmit (net/core/dev.h:168 net/core/dev.c:4429) 
[4669.330285][T21696] arp_solicit (net/ipv4/arp.c:392) 
[4669.330285][T21696] neigh_probe (net/core/neighbour.c:1077) 
| [4669.330285][T21696] dev_hard_start_xmit (./include/linux/netdevice.h:4924 ./include/linux/netdevice.h:4933 net/core/dev.c:3588 net/core/dev.c:3604) 
| [4669.330285][T21696] __dev_queue_xmit (net/core/dev.h:168 net/core/dev.c:4429) 
| [4669.330285][T21696] arp_solicit (net/ipv4/arp.c:392) 
| [4669.330285][T21696] neigh_probe (net/core/neighbour.c:1077) 
| [ 4669.330285][T21696]
[ 4669.333199][T21696] ref_tracker: veth_A-R1@ffff8880066295e8 has 2/5 users at
[4669.333199][T21696] dst_init (net/core/dst.c:53) 
[4669.333199][T21696] dst_alloc (net/core/dst.c:96) 
[4669.333199][T21696] ip6_dst_alloc (net/ipv6/route.c:342) 
[4669.333199][T21696] ip6_rt_pcpu_alloc (net/ipv6/route.c:1381) 
[4669.333199][T21696] ip6_pol_route (net/ipv6/route.c:1430 net/ipv6/route.c:2267) 
[4669.333199][T21696] fib6_rule_lookup (./include/net/ip6_fib.h:616 net/ipv6/fib6_rules.c:122) 
[4669.333199][T21696] ip6_route_output_flags (net/ipv6/route.c:2639 net/ipv6/route.c:2651) 
[4669.333199][T21696] ip6_dst_lookup_tail.constprop.0 (net/ipv6/ip6_output.c:1156) 
[4669.333199][T21696] ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1260) 
[4669.333199][T21696] udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:165 net/ipv6/ip6_udp_tunnel.c:135) 
[4669.333199][T21696] vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2530 (discriminator 4)) vxlan
[4669.333199][T21696] vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2795) vxlan
[4669.333199][T21696] dev_hard_start_xmit (./include/linux/netdevice.h:4924 ./include/linux/netdevice.h:4933 net/core/dev.c:3588 net/core/dev.c:3604) 
[4669.333199][T21696] __dev_queue_xmit (net/core/dev.h:168 net/core/dev.c:4429) 
[4669.333199][T21696] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:141) 
[4669.333199][T21696] ip6_finish_output (net/ipv6/ip6_output.c:215 net/ipv6/ip6_output.c:226) 
| [4669.333199][T21696] dev_hard_start_xmit (./include/linux/netdevice.h:4924 ./include/linux/netdevice.h:4933 net/core/dev.c:3588 net/core/dev.c:3604) 
| [4669.333199][T21696] __dev_queue_xmit (net/core/dev.h:168 net/core/dev.c:4429) 
| [4669.333199][T21696] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:141) 
| [4669.333199][T21696] ip6_finish_output (net/ipv6/ip6_output.c:215 net/ipv6/ip6_output.c:226) 
| [ 4669.333199][T21696]
[ 4669.335571][T21696] ref_tracker: veth_A-R1@ffff8880066295e8 has 1/5 users at
[4669.335571][T21696] netdev_get_by_index (net/core/dev.c:918) 
[4669.335571][T21696] fib6_nh_init (net/ipv6/route.c:3543) 
[4669.335571][T21696] nh_create_ipv6 (net/ipv4/nexthop.c:2841) 
[4669.335571][T21696] nexthop_create (net/ipv4/nexthop.c:2892) 
[4669.335571][T21696] rtm_new_nexthop (net/ipv4/nexthop.c:2934 net/ipv4/nexthop.c:3220) 
[4669.335571][T21696] rtnetlink_rcv_msg (net/core/rtnetlink.c:6749) 
[4669.335571][T21696] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[4669.335571][T21696] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[4669.335571][T21696] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[4669.335571][T21696] ____sys_sendmsg (net/socket.c:729 net/socket.c:744 net/socket.c:2607) 
[4669.335571][T21696] ___sys_sendmsg (net/socket.c:2663) 
[4669.335571][T21696] __sys_sendmsg (./include/linux/file.h:35 net/socket.c:2692) 
[4669.335571][T21696] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[4669.335571][T21696] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [4669.335571][T21696] ___sys_sendmsg (net/socket.c:2663) 
| [4669.335571][T21696] __sys_sendmsg (./include/linux/file.h:35 net/socket.c:2692) 
| [4669.335571][T21696] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [4669.335571][T21696] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [ 4669.335571][T21696]
[ 4669.337680][T21696] ref_tracker: veth_A-R1@ffff8880066295e8 has 1/5 users at
[4669.337680][T21696] ipv6_add_dev (net/ipv6/addrconf.c:344 net/ipv6/addrconf.c:409) 
[4669.337680][T21696] addrconf_notify (net/ipv6/addrconf.c:3656) 
[4669.337680][T21696] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) 
[4669.337680][T21696] register_netdevice (./include/linux/notifier.h:207 net/core/dev.c:10525) 
[4669.337680][T21696] veth_newlink (drivers/net/veth.c:1861) 
[4669.337680][T21696] rtnl_newlink_create (net/core/rtnetlink.c:3613) 
[4669.337680][T21696] __rtnl_newlink (net/core/rtnetlink.c:3833) 
[4669.337680][T21696] rtnl_newlink (net/core/rtnetlink.c:3847) 
[4669.337680][T21696] rtnetlink_rcv_msg (net/core/rtnetlink.c:6749) 
[4669.337680][T21696] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[4669.337680][T21696] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[4669.337680][T21696] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[4669.337680][T21696] ____sys_sendmsg (net/socket.c:729 net/socket.c:744 net/socket.c:2607) 
[4669.337680][T21696] ___sys_sendmsg (net/socket.c:2663) 
[4669.337680][T21696] __sys_sendmsg (./include/linux/file.h:35 net/socket.c:2692) 
[4669.337680][T21696] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [4669.337680][T21696] ___sys_sendmsg (net/socket.c:2663) 
| [4669.337680][T21696] __sys_sendmsg (./include/linux/file.h:35 net/socket.c:2692) 
| [4669.337680][T21696] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [ 4669.337680][T21696]
| [ 4679.449607][T21696] unregister_netdevice: waiting for veth_A-R1 to become free. Usage count = 6
[ 4679.450005][T21696] ref_tracker: veth_A-R1@ffff8880066295e8 has 1/5 users at
[4679.450005][T21696] dst_init (net/core/dst.c:53) 
[4679.450005][T21696] dst_alloc (net/core/dst.c:96) 
[4679.450005][T21696] ip6_dst_alloc (net/ipv6/route.c:342) 
[4679.450005][T21696] ip6_rt_pcpu_alloc (net/ipv6/route.c:1381) 
[4679.450005][T21696] ip6_pol_route (net/ipv6/route.c:1430 net/ipv6/route.c:2267) 
[4679.450005][T21696] fib6_rule_lookup (./include/net/ip6_fib.h:616 net/ipv6/fib6_rules.c:122) 
[4679.450005][T21696] ip6_route_output_flags (net/ipv6/route.c:2639 net/ipv6/route.c:2651) 
[4679.450005][T21696] ip6_dst_lookup_tail.constprop.0 (net/ipv6/ip6_output.c:1156) 
[4679.450005][T21696] ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1260) 
[4679.450005][T21696] udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:165 net/ipv6/ip6_udp_tunnel.c:135) 
[4679.450005][T21696] vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2530 (discriminator 4)) vxlan
[4679.450005][T21696] vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2795) vxlan
[4679.450005][T21696] dev_hard_start_xmit (./include/linux/netdevice.h:4924 ./include/linux/netdevice.h:4933 net/core/dev.c:3588 net/core/dev.c:3604) 
[4679.450005][T21696] __dev_queue_xmit (net/core/dev.h:168 net/core/dev.c:4429) 
[4679.450005][T21696] arp_solicit (net/ipv4/arp.c:392) 
[4679.450005][T21696] neigh_probe (net/core/neighbour.c:1077) 
| [4679.450005][T21696] dev_hard_start_xmit (./include/linux/netdevice.h:4924 ./include/linux/netdevice.h:4933 net/core/dev.c:3588 net/core/dev.c:3604) 
| [4679.450005][T21696] __dev_queue_xmit (net/core/dev.h:168 net/core/dev.c:4429) 
| [4679.450005][T21696] arp_solicit (net/ipv4/arp.c:392) 
| [4679.450005][T21696] neigh_probe (net/core/neighbour.c:1077) 
| [ 4679.450005][T21696]
[ 4679.452283][T21696] ref_tracker: veth_A-R1@ffff8880066295e8 has 2/5 users at
[4679.452283][T21696] dst_init (net/core/dst.c:53) 
[4679.452283][T21696] dst_alloc (net/core/dst.c:96) 
[4679.452283][T21696] ip6_dst_alloc (net/ipv6/route.c:342) 
[4679.452283][T21696] ip6_rt_pcpu_alloc (net/ipv6/route.c:1381) 
[4679.452283][T21696] ip6_pol_route (net/ipv6/route.c:1430 net/ipv6/route.c:2267) 
[4679.452283][T21696] fib6_rule_lookup (./include/net/ip6_fib.h:616 net/ipv6/fib6_rules.c:122) 
[4679.452283][T21696] ip6_route_output_flags (net/ipv6/route.c:2639 net/ipv6/route.c:2651) 
[4679.452283][T21696] ip6_dst_lookup_tail.constprop.0 (net/ipv6/ip6_output.c:1156) 
[4679.452283][T21696] ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1260) 
[4679.452283][T21696] udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:165 net/ipv6/ip6_udp_tunnel.c:135) 
[4679.452283][T21696] vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2530 (discriminator 4)) vxlan
[4679.452283][T21696] vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2795) vxlan
[4679.452283][T21696] dev_hard_start_xmit (./include/linux/netdevice.h:4924 ./include/linux/netdevice.h:4933 net/core/dev.c:3588 net/core/dev.c:3604) 
[4679.452283][T21696] __dev_queue_xmit (net/core/dev.h:168 net/core/dev.c:4429) 
[4679.452283][T21696] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:141) 
[4679.452283][T21696] ip6_finish_output (net/ipv6/ip6_output.c:215 net/ipv6/ip6_output.c:226) 
| [4679.452283][T21696] dev_hard_start_xmit (./include/linux/netdevice.h:4924 ./include/linux/netdevice.h:4933 net/core/dev.c:3588 net/core/dev.c:3604) 
| [4679.452283][T21696] __dev_queue_xmit (net/core/dev.h:168 net/core/dev.c:4429) 
| [4679.452283][T21696] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:141) 
| [4679.452283][T21696] ip6_finish_output (net/ipv6/ip6_output.c:215 net/ipv6/ip6_output.c:226) 
| [ 4679.452283][T21696]
[ 4679.454558][T21696] ref_tracker: veth_A-R1@ffff8880066295e8 has 1/5 users at
[4679.454558][T21696] netdev_get_by_index (net/core/dev.c:918) 
[4679.454558][T21696] fib6_nh_init (net/ipv6/route.c:3543) 
[4679.454558][T21696] nh_create_ipv6 (net/ipv4/nexthop.c:2841) 
[4679.454558][T21696] nexthop_create (net/ipv4/nexthop.c:2892) 
[4679.454558][T21696] rtm_new_nexthop (net/ipv4/nexthop.c:2934 net/ipv4/nexthop.c:3220) 
[4679.454558][T21696] rtnetlink_rcv_msg (net/core/rtnetlink.c:6749) 
[4679.454558][T21696] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[4679.454558][T21696] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[4679.454558][T21696] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[4679.454558][T21696] ____sys_sendmsg (net/socket.c:729 net/socket.c:744 net/socket.c:2607) 
[4679.454558][T21696] ___sys_sendmsg (net/socket.c:2663) 
[4679.454558][T21696] __sys_sendmsg (./include/linux/file.h:35 net/socket.c:2692) 
[4679.454558][T21696] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[4679.454558][T21696] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [4679.454558][T21696] ___sys_sendmsg (net/socket.c:2663) 
| [4679.454558][T21696] __sys_sendmsg (./include/linux/file.h:35 net/socket.c:2692) 
| [4679.454558][T21696] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [4679.454558][T21696] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [ 4679.454558][T21696]
[ 4679.456523][T21696] ref_tracker: veth_A-R1@ffff8880066295e8 has 1/5 users at
[4679.456523][T21696] ipv6_add_dev (net/ipv6/addrconf.c:344 net/ipv6/addrconf.c:409) 
[4679.456523][T21696] addrconf_notify (net/ipv6/addrconf.c:3656) 
[4679.456523][T21696] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) 
[4679.456523][T21696] register_netdevice (./include/linux/notifier.h:207 net/core/dev.c:10525) 
[4679.456523][T21696] veth_newlink (drivers/net/veth.c:1861) 
[4679.456523][T21696] rtnl_newlink_create (net/core/rtnetlink.c:3613) 
[4679.456523][T21696] __rtnl_newlink (net/core/rtnetlink.c:3833) 
[4679.456523][T21696] rtnl_newlink (net/core/rtnetlink.c:3847) 
[4679.456523][T21696] rtnetlink_rcv_msg (net/core/rtnetlink.c:6749) 
[4679.456523][T21696] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[4679.456523][T21696] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[4679.456523][T21696] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[4679.456523][T21696] ____sys_sendmsg (net/socket.c:729 net/socket.c:744 net/socket.c:2607) 
[4679.456523][T21696] ___sys_sendmsg (net/socket.c:2663) 
[4679.456523][T21696] __sys_sendmsg (./include/linux/file.h:35 net/socket.c:2692) 


Finger prints:
dst_init:dst_alloc:ip6_dst_alloc:ip6_rt_pcpu_alloc:ip6_pol_route
___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
dev_hard_start_xmit:__dev_queue_xmit:arp_solicit:neigh_probe:dst_init
___sys_sendmsg:__sys_sendmsg:do_syscall_64:ipv6_add_dev:addrconf_notify