======================================
| [ 2853.103834][   T11] veth_A-C (unregistering): left promiscuous mode
| [ 2863.443714][T14241] geneve_a: left promiscuous mode
| [ 2867.745770][T14256] ovs_br0: left promiscuous mode
| [ 3609.180401][T18518] Initializing XFRM netlink socket
| [ 4038.769123][T20771] unregister_netdevice: waiting for veth_A-R1 to become free. Usage count = 6
[ 4038.769626][T20771] ref_tracker: veth_A-R1@ffff88800cac95e0 has 1/5 users at
[4038.769626][T20771] dst_init (net/core/dst.c:53) 
[4038.769626][T20771] dst_alloc (net/core/dst.c:96) 
[4038.769626][T20771] ip6_dst_alloc (net/ipv6/route.c:342) 
[4038.769626][T20771] ip6_rt_pcpu_alloc (net/ipv6/route.c:1381) 
[4038.769626][T20771] ip6_pol_route (net/ipv6/route.c:1430 net/ipv6/route.c:2267) 
[4038.769626][T20771] fib6_rule_lookup (./include/net/ip6_fib.h:616 net/ipv6/fib6_rules.c:121) 
[4038.769626][T20771] ip6_route_output_flags (net/ipv6/route.c:2639 net/ipv6/route.c:2651) 
[4038.769626][T20771] ip6_dst_lookup_tail.constprop.0 (net/ipv6/ip6_output.c:1148) 
[4038.769626][T20771] ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1252) 
[4038.769626][T20771] udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:165 net/ipv6/ip6_udp_tunnel.c:135) 
[4038.769626][T20771] vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2531 (discriminator 4)) vxlan
[4038.769626][T20771] vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2796) vxlan
[4038.769626][T20771] dev_hard_start_xmit (./include/linux/netdevice.h:4915 ./include/linux/netdevice.h:4924 net/core/dev.c:3581 net/core/dev.c:3597) 
[4038.769626][T20771] __dev_queue_xmit (net/core/dev.h:168 net/core/dev.c:4425) 
[4038.769626][T20771] arp_solicit (net/ipv4/arp.c:392) 
[4038.769626][T20771] neigh_probe (net/core/neighbour.c:1077) 
| [4038.769626][T20771] dev_hard_start_xmit (./include/linux/netdevice.h:4915 ./include/linux/netdevice.h:4924 net/core/dev.c:3581 net/core/dev.c:3597) 
| [4038.769626][T20771] __dev_queue_xmit (net/core/dev.h:168 net/core/dev.c:4425) 
| [4038.769626][T20771] arp_solicit (net/ipv4/arp.c:392) 
| [4038.769626][T20771] neigh_probe (net/core/neighbour.c:1077) 
| [ 4038.769626][T20771]
[ 4038.772197][T20771] ref_tracker: veth_A-R1@ffff88800cac95e0 has 2/5 users at
[4038.772197][T20771] dst_init (net/core/dst.c:53) 
[4038.772197][T20771] dst_alloc (net/core/dst.c:96) 
[4038.772197][T20771] ip6_dst_alloc (net/ipv6/route.c:342) 
[4038.772197][T20771] ip6_rt_pcpu_alloc (net/ipv6/route.c:1381) 
[4038.772197][T20771] ip6_pol_route (net/ipv6/route.c:1430 net/ipv6/route.c:2267) 
[4038.772197][T20771] fib6_rule_lookup (./include/net/ip6_fib.h:616 net/ipv6/fib6_rules.c:121) 
[4038.772197][T20771] ip6_route_output_flags (net/ipv6/route.c:2639 net/ipv6/route.c:2651) 
[4038.772197][T20771] ip6_dst_lookup_tail.constprop.0 (net/ipv6/ip6_output.c:1148) 
[4038.772197][T20771] ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1252) 
[4038.772197][T20771] udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:165 net/ipv6/ip6_udp_tunnel.c:135) 
[4038.772197][T20771] vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2531 (discriminator 4)) vxlan
[4038.772197][T20771] vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2796) vxlan
[4038.772197][T20771] dev_hard_start_xmit (./include/linux/netdevice.h:4915 ./include/linux/netdevice.h:4924 net/core/dev.c:3581 net/core/dev.c:3597) 
[4038.772197][T20771] __dev_queue_xmit (net/core/dev.h:168 net/core/dev.c:4425) 
[4038.772197][T20771] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
[4038.772197][T20771] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
| [4038.772197][T20771] dev_hard_start_xmit (./include/linux/netdevice.h:4915 ./include/linux/netdevice.h:4924 net/core/dev.c:3581 net/core/dev.c:3597) 
| [4038.772197][T20771] __dev_queue_xmit (net/core/dev.h:168 net/core/dev.c:4425) 
| [4038.772197][T20771] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
| [4038.772197][T20771] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
| [ 4038.772197][T20771]
[ 4038.774509][T20771] ref_tracker: veth_A-R1@ffff88800cac95e0 has 1/5 users at
[4038.774509][T20771] netdev_get_by_index (net/core/dev.c:917) 
[4038.774509][T20771] fib6_nh_init (net/ipv6/route.c:3543) 
[4038.774509][T20771] nh_create_ipv6 (net/ipv4/nexthop.c:2827) 
[4038.774509][T20771] nexthop_create (net/ipv4/nexthop.c:2878) 
[4038.774509][T20771] rtm_new_nexthop (net/ipv4/nexthop.c:2920 net/ipv4/nexthop.c:3206) 
[4038.774509][T20771] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[4038.774509][T20771] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[4038.774509][T20771] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[4038.774509][T20771] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[4038.774509][T20771] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2585) 
[4038.774509][T20771] ___sys_sendmsg (net/socket.c:2641) 
[4038.774509][T20771] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2670) 
[4038.774509][T20771] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[4038.774509][T20771] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [4038.774509][T20771] ___sys_sendmsg (net/socket.c:2641) 
| [4038.774509][T20771] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2670) 
| [4038.774509][T20771] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| [4038.774509][T20771] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| [ 4038.774509][T20771]
[ 4038.776544][T20771] ref_tracker: veth_A-R1@ffff88800cac95e0 has 1/5 users at
[4038.776544][T20771] ipv6_add_dev (net/ipv6/addrconf.c:344 net/ipv6/addrconf.c:409) 
[4038.776544][T20771] addrconf_notify (net/ipv6/addrconf.c:3654) 
[4038.776544][T20771] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) 
[4038.776544][T20771] register_netdevice (./include/linux/notifier.h:207 net/core/dev.c:10481) 
[4038.776544][T20771] veth_newlink (drivers/net/veth.c:1860) 
[4038.776544][T20771] rtnl_newlink_create (net/core/rtnetlink.c:3510) 
[4038.776544][T20771] __rtnl_newlink (net/core/rtnetlink.c:3730) 
[4038.776544][T20771] rtnl_newlink (net/core/rtnetlink.c:3744) 
[4038.776544][T20771] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[4038.776544][T20771] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[4038.776544][T20771] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[4038.776544][T20771] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[4038.776544][T20771] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2585) 
[4038.776544][T20771] ___sys_sendmsg (net/socket.c:2641) 
[4038.776544][T20771] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2670) 


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