======================================
| [ 2290.860404][T19800] br2: port 2(veth2.20) entered forwarding state
| [ 2293.214255][    C1] ------------[ cut here ]------------
| [ 2293.214838][ C1] WARNING: CPU: 1 PID: 22 at ./include/linux/skbuff.h:1164 icmp_route_lookup.constprop.0 (./include/linux/skbuff.h:1164 ./include/linux/skbuff.h:1178 net/ipv4/icmp.c:548) 
| [ 2293.215729][    C1] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel act_mirred ip6_gre ip6_tunnel tunnel6 cls_matchall bridge stp llc act_gact cls_flower sch_ingress 8021q ip_gre gre vrf veth
[ 2293.217466][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 2293.217850][ C1] RIP: 0010:icmp_route_lookup.constprop.0 (./include/linux/skbuff.h:1164 ./include/linux/skbuff.h:1178 net/ipv4/icmp.c:548) 
[ 2293.218260][ C1] Code: c1 ea 03 80 3c 02 00 0f 85 2c 05 00 00 48 8b 45 58 48 89 44 24 08 a8 01 0f 85 35 02 00 00 48 f7 44 24 08 fe ff ff ff 74 04 90 <0f> 0b 90 48 b8 00 00 00 00 00 fc ff df 4c 89 da 48 c1 ea 03 80 3c
All code
========
   0:	c1 ea 03             	shr    $0x3,%edx
   3:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   7:	0f 85 2c 05 00 00    	jne    0x539
   d:	48 8b 45 58          	mov    0x58(%rbp),%rax
  11:	48 89 44 24 08       	mov    %rax,0x8(%rsp)
  16:	a8 01                	test   $0x1,%al
  18:	0f 85 35 02 00 00    	jne    0x253
  1e:	48 f7 44 24 08 fe ff 	testq  $0xfffffffffffffffe,0x8(%rsp)
  25:	ff ff 
  27:	74 04                	je     0x2d
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  34:	fc ff df 
  37:	4c 89 da             	mov    %r11,%rdx
  3a:	48 c1 ea 03          	shr    $0x3,%rdx
  3e:	80                   	.byte 0x80
  3f:	3c                   	.byte 0x3c

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   a:	fc ff df 
   d:	4c 89 da             	mov    %r11,%rdx
  10:	48 c1 ea 03          	shr    $0x3,%rdx
  14:	80                   	.byte 0x80
  15:	3c                   	.byte 0x3c
[ 2293.219360][    C1] RSP: 0018:ffffc900001974e8 EFLAGS: 00010282
[ 2293.219762][    C1] RAX: ffff888005339e40 RBX: 1ffff92000032ea1 RCX: 0000000000000002
[ 2293.220238][    C1] RDX: 1ffff110021ed243 RSI: ffffffff9429e3c3 RDI: ffffc9000019759a
[ 2293.220701][    C1] RBP: ffff888010f691c0 R08: 0000000000000001 R09: ffff888005338f40
[ 2293.221145][    C1] R10: ffffffff952050d7 R11: ffff888010f69218 R12: ffffffff971e5b00
[ 2293.221600][    C1] R13: ffffc90000197798 R14: ffff88800ef14c40 R15: ffffc90000197528
[ 2293.222052][    C1] FS:  0000000000000000(0000) GS:ffff88809ff31000(0000) knlGS:0000000000000000
[ 2293.222581][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2293.222988][    C1] CR2: 00007ff39207f000 CR3: 0000000020536006 CR4: 0000000000772ef0
[ 2293.223442][    C1] PKRU: 55555554
[ 2293.223667][    C1] Call Trace:
[ 2293.223890][    C1]  <TASK>
[ 2293.224053][ C1] ? __pfx_icmp_route_lookup.constprop.0 (net/ipv4/icmp.c:480) 
[ 2293.224459][ C1] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 2293.224773][ C1] ? __ip_options_echo (net/ipv4/ip_options.c:86) 
[ 2293.225069][ C1] ? __icmp_send (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/ipv4/icmp.c:718) 
[ 2293.225369][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 2293.225667][ C1] __icmp_send (net/ipv4/icmp.c:746) 
[ 2293.225975][ C1] ? ip_route_input_slow (net/ipv4/route.c:2423) 
[ 2293.226270][ C1] ? __pfx___icmp_send (net/ipv4/icmp.c:596) 
[ 2293.226574][ C1] ? handle_softirqs (kernel/softirq.c:579) 
[ 2293.226874][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 2293.227189][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 2293.227496][ C1] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 2293.227791][ C1] ? ip_error (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/ipv4/route.c:1004) 
[ 2293.228012][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 2293.228314][ C1] ip_error (./include/net/icmp.h:44 net/ipv4/route.c:1007) 
[ 2293.228554][ C1] ? __pfx_ip_error (net/ipv4/route.c:933) 
[ 2293.228852][ C1] ? ip_rcv_finish_core (net/ipv4/ip_input.c:371) 
[ 2293.229153][ C1] ? ip_rcv (./include/net/dst.h:471 ./include/net/dst.h:469 net/ipv4/ip_input.c:454 ./include/linux/netfilter.h:317 ./include/linux/netfilter.h:311 net/ipv4/ip_input.c:574) 
[ 2293.229390][ C1] ip_rcv (./include/net/dst.h:471 ./include/net/dst.h:469 net/ipv4/ip_input.c:454 ./include/linux/netfilter.h:317 ./include/linux/netfilter.h:311 net/ipv4/ip_input.c:574) 
[ 2293.229619][ C1] ? __pfx_ip_rcv (net/ipv4/ip_input.c:567) 
[ 2293.229913][ C1] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 2293.230206][ C1] ? validate_chain (kernel/locking/lockdep.c:3804 kernel/locking/lockdep.c:3824 kernel/locking/lockdep.c:3879) 
[ 2293.230515][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 2293.230812][ C1] ? __pfx_ip_rcv (net/ipv4/ip_input.c:567) 
[ 2293.231110][ C1] ? process_backlog (./include/linux/local_lock_internal.h:54 net/core/dev.c:6442) 
[ 2293.231414][ C1] __netif_receive_skb_one_core (net/core/dev.c:5979 (discriminator 4)) 
[ 2293.231789][ C1] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5972) 
[ 2293.232157][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 2293.232560][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 2293.232854][ C1] ? process_backlog (./include/linux/local_lock_internal.h:54 net/core/dev.c:6442) 
[ 2293.233153][ C1] process_backlog (./include/linux/rcupdate.h:869 net/core/dev.c:6445) 
[ 2293.233460][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 2293.233758][ C1] __napi_poll.constprop.0 (net/core/dev.c:7483) 
[ 2293.234058][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 2293.234365][ C1] net_rx_action (net/core/dev.c:7546 net/core/dev.c:7673) 
[ 2293.234662][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 2293.234961][ C1] ? __pfx_net_rx_action (net/core/dev.c:7635) 
[ 2293.235255][ C1] ? trace_sched_exit_tp (./include/trace/events/sched.h:888 (discriminator 21)) 
[ 2293.235558][ C1] ? __schedule (kernel/sched/core.c:6663) 
[ 2293.235860][ C1] ? __pfx___schedule (kernel/sched/core.c:6663) 
[ 2293.236166][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 2293.236485][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 2293.236782][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 2293.237072][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 2293.237375][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 2293.237671][ C1] kthread (kernel/kthread.c:464) 
[ 2293.237898][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 2293.238195][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 2293.238507][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 2293.238801][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 2293.239096][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 2293.239403][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 2293.239728][ C1] ? __pfx_kthread (kernel/kthread.c:413) 


Finger prints:
__icmp_send:ip_error:ip_rcv:__netif_receive_skb_one_core:process_backlog