======================================
| [   28.918370] br1: received packet on vx20 with own address as source address (addr:00:00:5e:00:01:01, vlan:20)
| [   28.981611] ------------[ cut here ]------------
| [   28.981738] kernel BUG at net/core/skbuff.c:3505!
| [   28.981779] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
[   28.981869] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   28.981948] Workqueue: ipv6_addrconf addrconf_dad_work
[   28.981992] RIP: 0010:__skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 28.982027] Code: 89 5c 24 04 44 89 d9 44 89 ff 44 89 ea ff d0 0f 1f 00 44 8b 5c 24 04 41 89 c7 eb b6 ff d0 0f 1f 00 41 89 c1 e9 71 fd ff ff 90 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90
All code
========
   0:	89 5c 24 04          	mov    %ebx,0x4(%rsp)
   4:	44 89 d9             	mov    %r11d,%ecx
   7:	44 89 ff             	mov    %r15d,%edi
   a:	44 89 ea             	mov    %r13d,%edx
   d:	ff d0                	call   *%rax
   f:	0f 1f 00             	nopl   (%rax)
  12:	44 8b 5c 24 04       	mov    0x4(%rsp),%r11d
  17:	41 89 c7             	mov    %eax,%r15d
  1a:	eb b6                	jmp    0xffffffffffffffd2
  1c:	ff d0                	call   *%rax
  1e:	0f 1f 00             	nopl   (%rax)
  21:	41 89 c1             	mov    %eax,%r9d
  24:	e9 71 fd ff ff       	jmp    0xfffffffffffffd9a
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
  33:	00 00 00 00 
  37:	90                   	nop
  38:	90                   	nop
  39:	90                   	nop
  3a:	90                   	nop
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
   9:	00 00 00 00 
   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
[   28.982137] RSP: 0018:ffff9cae40114d90 EFLAGS: 00010206
[   28.982176] RAX: 00000000000000a6 RBX: 0000000000000008 RCX: ffff912203811700
[   28.982227] RDX: ffff912203882bc0 RSI: 0000000000000100 RDI: ffff912203882ac0
[   28.982277] RBP: ffff9cae40114de8 R08: ffff9cae40114de8 R09: 000000003ee60301
[   28.982326] R10: 0000000000000008 R11: ffff9122038117d4 R12: ffff912201fbd400
[   28.982376] R13: 0000000000000008 R14: 0000000000000000 R15: 000000003ee60301
[   28.982428] FS:  0000000000000000(0000) GS:ffff91223ed00000(0000) knlGS:0000000000000000
[   28.982478] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   28.982520] CR2: 00007f53974121b4 CR3: 000000000523e003 CR4: 0000000000770ef0
[   28.982571] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   28.982621] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   28.982672] PKRU: 55555554
[   28.982693] Call Trace:
[   28.982711]  <IRQ>
[   28.982732] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) 
[   28.982764] ? do_trap (arch/x86/kernel/traps.c:113 arch/x86/kernel/traps.c:154) 
[   28.982792] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[   28.982820] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:175) 
[   28.982848] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[   28.982876] ? exc_invalid_op (arch/x86/kernel/traps.c:265) 
[   28.982904] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[   28.982933] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[   28.982964] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[   28.982993] __skb_checksum_complete (./arch/x86/include/asm/checksum_64.h:170 ./arch/x86/include/asm/checksum_64.h:180 net/core/skbuff.c:3643) 
[   28.983029] ? __pfx_csum_partial_ext (./include/net/checksum.h:120) 
[   28.983064] ? __pfx_csum_block_add_ext (./include/net/checksum.h:103) 
[   28.983099] icmpv6_rcv (./include/linux/skbuff.h:4567 net/ipv6/icmp.c:921) 
[   28.983130] ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:438 (discriminator 5)) 
[   28.983168] ip6_input_finish (./include/linux/rcupdate.h:782 net/ipv6/ip6_input.c:484) 
[   28.983195] __netif_receive_skb_one_core (net/core/dev.c:5613) 
[   28.983233] process_backlog (./include/linux/rcupdate.h:782 net/core/dev.c:6053) 
[   28.983260] __napi_poll (net/core/dev.c:6703) 
[   28.983290] net_rx_action (net/core/dev.c:6774 net/core/dev.c:6886) 
[   28.983321] __do_softirq (kernel/softirq.c:553) 
[   28.983351] do_softirq (kernel/softirq.c:454 kernel/softirq.c:441) 
[   28.983383]  </IRQ>
[   28.983403]  <TASK>
[   28.983418] __local_bh_enable_ip (kernel/softirq.c:381) 
[   28.983447] addrconf_dad_work (net/ipv6/addrconf.c:4236) 
[   28.983477] process_one_work (kernel/workqueue.c:2633) 
[   28.983511] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[   28.983546] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[   28.983575] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[   28.983610] kthread (kernel/kthread.c:388) 
[   28.983639] ? __pfx_kthread (kernel/kthread.c:341) 
[   28.983667] ret_from_fork (arch/x86/kernel/process.c:147) 
[   28.983696] ? __pfx_kthread (kernel/kthread.c:341) 


Finger prints:
__skb_checksum:__skb_checksum_complete:icmpv6_rcv:ip6_protocol_deliver_rcu