======================================
| [  628.530839][   T39] br2: port 1(w1) entered forwarding state
| [  629.492370][    C3] ------------[ cut here ]------------
| [  629.492925][    C3] WARNING: ./include/linux/skbuff.h:3239 at __udp6_lib_err_encap+0x614/0x950, CPU#3: ksoftirqd/3/33
| [  629.493213][    C3] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel dummy cls_u32 8021q act_gact cls_flower sch_ingress bridge stp llc vrf veth
[  629.493988][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  629.494161][    C3] RIP: 0010:__udp6_lib_err_encap (./include/linux/skbuff.h:3239 (discriminator 3) ./include/linux/skbuff.h:3235 (discriminator 3) net/ipv6/udp.c:652 (discriminator 3))
[  629.494338][    C3] Code: 08 84 d2 0f 85 4f 02 00 00 44 8b 4b 28 e9 a9 fe ff ff 4c 8b 6c 24 20 4c 8b 7c 24 28 45 31 e4 4c 8b 74 24 30 e9 d7 fd ff ff 90 <0f> 0b 90 48 29 c5 48 89 e8 48 81 fd ff ff 00 00 0f 86 ff fa ff ff
All code
========
   0:	08 84 d2 0f 85 4f 02 	or     %al,0x24f850f(%rdx,%rdx,8)
   7:	00 00                	add    %al,(%rax)
   9:	44 8b 4b 28          	mov    0x28(%rbx),%r9d
   d:	e9 a9 fe ff ff       	jmp    0xfffffffffffffebb
  12:	4c 8b 6c 24 20       	mov    0x20(%rsp),%r13
  17:	4c 8b 7c 24 28       	mov    0x28(%rsp),%r15
  1c:	45 31 e4             	xor    %r12d,%r12d
  1f:	4c 8b 74 24 30       	mov    0x30(%rsp),%r14
  24:	e9 d7 fd ff ff       	jmp    0xfffffffffffffe00
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	48 29 c5             	sub    %rax,%rbp
  30:	48 89 e8             	mov    %rbp,%rax
  33:	48 81 fd ff ff 00 00 	cmp    $0xffff,%rbp
  3a:	0f 86 ff fa ff ff    	jbe    0xfffffffffffffb3f

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	48 29 c5             	sub    %rax,%rbp
   6:	48 89 e8             	mov    %rbp,%rax
   9:	48 81 fd ff ff 00 00 	cmp    $0xffff,%rbp
  10:	0f 86 ff fa ff ff    	jbe    0xfffffffffffffb15
[  629.494819][    C3] RSP: 0018:ffa00000002574b8 EFLAGS: 00010293
[  629.494991][    C3] RAX: ff11000019dcb140 RBX: ff1100001bcd6580 RCX: ff11000019dcb1b0
[  629.495197][    C3] RDX: ff11000019dcb180 RSI: ff11000019dcb188 RDI: fffffffffffffff8
[  629.495411][    C3] RBP: ff11000019dcb188 R08: 1fe220000379acc9 R09: ff1100001bcd6580
[  629.495615][    C3] R10: ffffffff8cd35c00 R11: 0000000000000003 R12: 0000000000000000
[  629.495813][    C3] R13: ff1100001bcd6632 R14: ff1100001bcd6640 R15: ff1100001bcd6634
[  629.496019][    C3] FS:  0000000000000000(0000) GS:ff110000aa32b000(0000) knlGS:0000000000000000
[  629.496260][    C3] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  629.496431][    C3] CR2: 00007f797394c4a0 CR3: 000000000f33a001 CR4: 0000000000771ef0
[  629.496643][    C3] PKRU: 55555554
[  629.496745][    C3] Call Trace:
[  629.496847][    C3]  <TASK>
[  629.496921][    C3]  udpv6_err (net/ipv6/udp.c:714)
[  629.497030][    C3]  ? __udp6_lib_err_encap (net/ipv6/udp.c:695)
[  629.497168][    C3]  icmpv6_notify (net/ipv6/icmp.c:1087)
[  629.497302][    C3]  ? icmpv6_param_prob_reason (net/ipv6/icmp.c:1039)
[  629.497433][    C3]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:5870 (discriminator 2))
[  629.497568][    C3]  ? find_held_lock (kernel/locking/lockdep.c:5350 (discriminator 1))
[  629.497713][    C3]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5536)
[  629.497848][    C3]  icmpv6_rcv (net/ipv6/icmp.c:1230)
[  629.497984][    C3]  ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:480)
[  629.498129][    C3]  ip6_input_finish (net/ipv6/ip6_input.c:532)
[  629.498262][    C3]  ip6_input (./include/linux/rcupdate.h:867 net/ipv6/ip6_input.c:543)
[  629.498362][    C3]  ? ip6_input_finish (net/ipv6/ip6_input.c:536)
[  629.498496][    C3]  ? ip6_rcv_core (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) net/ipv6/ip6_input.c:328 (discriminator 2))
[  629.498635][    C3]  ? __asan_memset (mm/kasan/shadow.c:84 (discriminator 2))
[  629.498770][    C3]  ? ip6_rcv_core (./include/net/sock.h:2995 net/ipv6/ip6_input.c:331)
[  629.498905][    C3]  ipv6_rcv (./include/net/dst.h:480 (discriminator 4) net/ipv6/ip6_input.c:119 (discriminator 4) ./include/linux/netfilter.h:318 (discriminator 4) ./include/linux/netfilter.h:312 (discriminator 4) net/ipv6/ip6_input.c:351 (discriminator 4))
[  629.499006][    C3]  ? ip6_rcv_core (net/ipv6/ip6_input.c:345)
[  629.499143][    C3]  ? mark_usage (kernel/locking/lockdep.c:4674 (discriminator 1))
[  629.499277][    C3]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  629.499410][    C3]  ? process_backlog (./include/linux/local_lock_internal.h:62 (discriminator 2) net/core/dev.c:6671 (discriminator 2))
[  629.499544][    C3]  __netif_receive_skb_one_core (net/core/dev.c:6202)
[  629.499721][    C3]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:5870 (discriminator 2))
[  629.499853][    C3]  ? __netif_receive_skb_list_core (net/core/dev.c:6202)
[  629.500017][    C3]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  629.500156][    C3]  process_backlog (./include/linux/rcupdate.h:867 net/core/dev.c:6674)
[  629.500290][    C3]  __napi_poll (net/core/dev.c:7737)
[  629.500392][    C3]  net_rx_action (net/core/dev.c:7800 net/core/dev.c:7957)
[  629.500526][    C3]  ? __napi_poll (net/core/dev.c:7919)
[  629.500667][    C3]  ? find_held_lock (kernel/locking/lockdep.c:5350 (discriminator 1))
[  629.500806][    C3]  ? trace_sched_exit_tp (./include/trace/events/sched.h:886 (discriminator 24))
[  629.500939][    C3]  ? __schedule (kernel/sched/core.c:7012)
[  629.501077][    C3]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  629.501210][    C3]  handle_softirqs (./arch/x86/include/asm/jump_label.h:37 ./include/trace/events/irq.h:142 kernel/softirq.c:623)
[  629.501342][    C3]  ? find_held_lock (kernel/locking/lockdep.c:5350 (discriminator 1))
[  629.501474][    C3]  ? _local_bh_enable (kernel/softirq.c:580)
[  629.501613][    C3]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  629.501749][    C3]  run_ksoftirqd (kernel/softirq.c:479 kernel/softirq.c:1077 kernel/softirq.c:1068)
[  629.501878][    C3]  smpboot_thread_fn (kernel/smpboot.c:160)
[  629.502008][    C3]  ? sort_range (kernel/smpboot.c:103)
[  629.502109][    C3]  kthread (kernel/kthread.c:436)
[  629.502206][    C3]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 24))
[  629.502368][    C3]  ? kthread_affine_node (kernel/kthread.c:381)
[  629.502496][    C3]  ret_from_fork (arch/x86/kernel/process.c:164)
[  629.502634][    C3]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[  629.502798][    C3]  ? __switch_to (./arch/x86/include/asm/cpufeature.h:101 (discriminator 1) arch/x86/kernel/process_64.c:377 (discriminator 1) arch/x86/kernel/process_64.c:665 (discriminator 1))
[  629.502931][    C3]  ? kthread_affine_node (kernel/kthread.c:381)


Finger prints:
__udp6_lib_err_encap:udpv6_err:icmpv6_notify:icmpv6_rcv:ip6_protocol_deliver_rcu