======================================
| [   50.047838][  T429] br2: port 2(vx100) entered forwarding state
| [   50.213077][    C2] ------------[ cut here ]------------
| [   50.213523][    C2] kernel BUG at net/core/skbuff.c:3505!
| [   50.214048][    C2] invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
[   50.214651][    C2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 50.215128][ C2] RIP: 0010:__skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 50.215358][ C2] Code: 44 89 14 24 ff d0 0f 1f 00 4c 8b 44 24 08 44 8b 14 24 41 89 c1 eb a5 89 e8 e9 2d fe ff ff 41 ff d5 0f 1f 00 e9 1f fa ff ff 90 <0f> 0b 48 8b 7c 24 10 89 54 24 48 48 89 44 24 40 e8 17 a6 91 fe 8b
All code
========
   0:	44 89 14 24          	mov    %r10d,(%rsp)
   4:	ff d0                	call   *%rax
   6:	0f 1f 00             	nopl   (%rax)
   9:	4c 8b 44 24 08       	mov    0x8(%rsp),%r8
   e:	44 8b 14 24          	mov    (%rsp),%r10d
  12:	41 89 c1             	mov    %eax,%r9d
  15:	eb a5                	jmp    0xffffffffffffffbc
  17:	89 e8                	mov    %ebp,%eax
  19:	e9 2d fe ff ff       	jmp    0xfffffffffffffe4b
  1e:	41 ff d5             	call   *%r13
  21:	0f 1f 00             	nopl   (%rax)
  24:	e9 1f fa ff ff       	jmp    0xfffffffffffffa48
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	48 8b 7c 24 10       	mov    0x10(%rsp),%rdi
  31:	89 54 24 48          	mov    %edx,0x48(%rsp)
  35:	48 89 44 24 40       	mov    %rax,0x40(%rsp)
  3a:	e8 17 a6 91 fe       	call   0xfffffffffe91a656
  3f:	8b                   	.byte 0x8b

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	48 8b 7c 24 10       	mov    0x10(%rsp),%rdi
   7:	89 54 24 48          	mov    %edx,0x48(%rsp)
   b:	48 89 44 24 40       	mov    %rax,0x40(%rsp)
  10:	e8 17 a6 91 fe       	call   0xfffffffffe91a62c
  15:	8b                   	.byte 0x8b
[   50.216106][    C2] RSP: 0018:ffffc90000220888 EFLAGS: 00010202
[   50.216376][    C2] RAX: 000000000000f261 RBX: 0000000000000008 RCX: 1ffff1100708c1c9
[   50.216694][    C2] RDX: 0000000000000092 RSI: dffffc0000000000 RDI: ffff888038460e48
[   50.217012][    C2] RBP: 000000000000f261 R08: 0000000000000008 R09: ffffed100091d2e9
[   50.217328][    C2] R10: ffff8880081b8d08 R11: ffff888038460d40 R12: 0000000000000008
[   50.217645][    C2] R13: 0000000000000000 R14: ffffc90000220948 R15: ffff8880081b8d08
[   50.217960][    C2] FS:  0000000000000000(0000) GS:ffff88802fb00000(0000) knlGS:0000000000000000
[   50.218323][    C2] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   50.218594][    C2] CR2: 000055603ca23dec CR3: 0000000005394001 CR4: 0000000000770ef0
[   50.218912][    C2] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   50.219225][    C2] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   50.219544][    C2] PKRU: 55555554
[   50.219702][    C2] Call Trace:
[   50.219865][    C2]  <IRQ>
[ 50.219973][ C2] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) 
[ 50.220138][ C2] ? do_trap (arch/x86/kernel/traps.c:113 arch/x86/kernel/traps.c:154) 
[ 50.220302][ C2] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 50.220523][ C2] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:175) 
[ 50.220733][ C2] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 50.220945][ C2] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 50.221162][ C2] ? handle_invalid_op (arch/x86/kernel/traps.c:213) 
[ 50.221373][ C2] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 50.221584][ C2] ? exc_invalid_op (arch/x86/kernel/traps.c:265) 
[ 50.221795][ C2] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 50.222016][ C2] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 50.222226][ C2] ? __skb_checksum (net/core/skbuff.c:3441 (discriminator 4)) 
[ 50.222436][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 50.222649][ C2] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 50.222864][ C2] __skb_checksum_complete (net/core/skbuff.c:3643) 
[ 50.223077][ C2] ? __pfx___skb_checksum_complete (net/core/skbuff.c:3637) 
[ 50.223335][ C2] ? __pfx_csum_partial_ext (./include/net/checksum.h:120) 
[ 50.223543][ C2] ? __pfx_csum_block_add_ext (./include/net/checksum.h:103) 
[ 50.223759][ C2] ? ipv6_raw_deliver (net/ipv6/raw.c:142) 
[ 50.223974][ C2] icmpv6_rcv (./include/linux/skbuff.h:4567 net/ipv6/icmp.c:921) 
[ 50.224185][ C2] ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:438 (discriminator 5)) 
[ 50.224395][ C2] ? ip6_route_input (./include/linux/skbuff.h:1168 net/ipv6/route.c:2594) 
[ 50.224608][ C2] ip6_input_finish (./include/linux/rcupdate.h:779 net/ipv6/ip6_input.c:484) 
[ 50.224823][ C2] ip6_input (./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv6/ip6_input.c:492) 
[ 50.224981][ C2] ? __pfx_ip6_input (net/ipv6/ip6_input.c:491) 
[ 50.225192][ C2] ? ip6_rcv_core (./include/linux/skbuff.h:3181 net/ipv6/ip6_input.c:291) 
[ 50.225403][ C2] ipv6_rcv (./include/net/dst.h:460 net/ipv6/ip6_input.c:79 ./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv6/ip6_input.c:310) 
[ 50.225566][ C2] ? __pfx_ipv6_rcv (net/ipv6/ip6_input.c:304) 
[ 50.225779][ C2] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 50.225989][ C2] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:6051) 
[ 50.226202][ C2] ? __pfx_ipv6_rcv (net/ipv6/ip6_input.c:304) 
[ 50.226409][ C2] __netif_receive_skb_one_core (net/core/dev.c:5603) 
[ 50.226673][ C2] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5603) 
[ 50.226934][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 50.227145][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 50.227359][ C2] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:6051) 
[ 50.227573][ C2] process_backlog (./include/linux/rcupdate.h:779 net/core/dev.c:6053) 
[ 50.227785][ C2] __napi_poll.constprop.0 (net/core/dev.c:6703) 
[ 50.227995][ C2] net_rx_action (net/core/dev.c:6772 net/core/dev.c:6886) 
[ 50.228208][ C2] ? __pfx_net_rx_action (net/core/dev.c:6850) 
[ 50.228419][ C2] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 50.228627][ C2] ? ktime_get (./include/linux/seqlock.h:72 kernel/time/timekeeping.c:846) 
[ 50.228788][ C2] ? hrtimer_interrupt (kernel/time/hrtimer.c:1828) 
[ 50.229001][ C2] ? clockevents_program_event (kernel/time/clockevents.c:334 (discriminator 3)) 
[ 50.229267][ C2] __do_softirq (kernel/softirq.c:553) 
[ 50.229480][ C2] irq_exit_rcu (kernel/softirq.c:427 kernel/softirq.c:632 kernel/softirq.c:644) 
[ 50.229638][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1076 (discriminator 14)) 
[   50.229851][    C2]  </IRQ>
[   50.229957][    C2]  <TASK>
[ 50.230063][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:649) 
[ 50.230323][ C2] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:72 arch/x86/kernel/process.c:743) 
[ 50.230548][ C2] Code: 4c 01 c7 4c 29 c2 e9 72 ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 73 a4 3e 00 fb f4 <fa> c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
All code
========
   0:	4c 01 c7             	add    %r8,%rdi
   3:	4c 29 c2             	sub    %r8,%rdx
   6:	e9 72 ff ff ff       	jmp    0xffffffffffffff7d
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d 73 a4 3e 00 	verw   0x3ea473(%rip)        # 0x3ea49b
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	fa                   	cli		<-- trapping instruction
  2b:	c3                   	ret
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	cc                   	int3
  30:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
  37:	00 00 00 00 
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	fa                   	cli
   1:	c3                   	ret
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	cc                   	int3
   6:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
   d:	00 00 00 00 
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[   50.231292][    C2] RSP: 0018:ffffc9000014fdf8 EFLAGS: 00000242
[   50.231557][    C2] RAX: 000000000014cef1 RBX: 1ffff92000029fc1 RCX: ffffffffb9676802
[   50.231872][    C2] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffb7097aa6
[   50.232193][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005f66e64
[   50.232508][    C2] R10: ffff88802fb37323 R11: ffff88802fb3bec0 R12: 0000000000000000
[   50.232822][    C2] R13: ffff888001b622c0 R14: dffffc0000000000 R15: 0000000000000000
[ 50.233143][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 50.233356][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:171) 
[ 50.233570][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:98) 
[ 50.233786][ C2] cpuidle_idle_call (kernel/sched/idle.c:171) 
[ 50.233997][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:147) 
[ 50.234208][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 50.234421][ C2] do_idle (kernel/sched/idle.c:312) 
[ 50.234578][ C2] cpu_startup_entry (kernel/sched/idle.c:409 (discriminator 1)) 
[ 50.234786][ C2] start_secondary (arch/x86/kernel/smpboot.c:224 arch/x86/kernel/smpboot.c:304) 
[ 50.234996][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:254) 


Finger prints:
__skb_checksum:__skb_checksum_complete:icmpv6_rcv:ip6_protocol_deliver_rcu