======================================
| [    3.293905] br0: port 1(swp1) entered forwarding state
| [    3.319617] ------------[ cut here ]------------
| [    3.319686] kernel BUG at net/core/skbuff.c:3505!
| [    3.319733] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
[    3.319844] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[    3.319932] Workqueue: mld mld_dad_work
[    3.319978] RIP: 0010:__skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 3.320024] 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
[    3.320157] RSP: 0018:ffffbbc980003db0 EFLAGS: 00010206
[    3.320200] RAX: 000000000000007e RBX: 0000000000000008 RCX: ffff9ff2c27ee600
[    3.320266] RDX: ffff9ff2c26f2980 RSI: 0000000000000100 RDI: ffff9ff2c26f2880
[    3.320322] RBP: ffffbbc980003e08 R08: ffffbbc980003e08 R09: 00000000925b0303
[    3.320384] R10: 0000000000000008 R11: ffff9ff2c426bd80 R12: ffff9ff2c2b68f80
[    3.320445] R13: 0000000000000008 R14: 0000000000000000 R15: 00000000925b0303
[    3.320511] FS:  0000000000000000(0000) GS:ffff9ff2fec00000(0000) knlGS:0000000000000000
[    3.320569] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.320617] CR2: 00007f6507afe000 CR3: 0000000013444003 CR4: 0000000000770ef0
[    3.320679] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    3.320735] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    3.320797] PKRU: 55555554
[    3.320819] Call Trace:
[    3.320848]  <IRQ>
[    3.320871] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) 
[    3.320908] ? do_trap (arch/x86/kernel/traps.c:113 arch/x86/kernel/traps.c:154) 
[    3.320948] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[    3.320980] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:175) 
[    3.321020] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[    3.321058] ? exc_invalid_op (arch/x86/kernel/traps.c:265) 
[    3.321088] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[    3.321121] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[    3.321164] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[    3.321194] __skb_checksum_complete (./arch/x86/include/asm/checksum_64.h:170 ./arch/x86/include/asm/checksum_64.h:180 net/core/skbuff.c:3643) 
[    3.321232] ? __pfx_csum_partial_ext (./include/net/checksum.h:120) 
[    3.321274] ? __pfx_csum_block_add_ext (./include/net/checksum.h:103) 
[    3.321320] icmp_rcv (./include/linux/skbuff.h:4567 net/ipv4/icmp.c:1213) 
[    3.321355] ip_protocol_deliver_rcu (net/ipv4/ip_input.c:205 (discriminator 5)) 
[    3.321401] ip_local_deliver_finish (./include/linux/rcupdate.h:782 net/ipv4/ip_input.c:234) 
[    3.321442] __netif_receive_skb_one_core (net/core/dev.c:5610 (discriminator 4)) 
[    3.321485] process_backlog (./include/linux/rcupdate.h:782 net/core/dev.c:6053) 
[    3.321521] __napi_poll (net/core/dev.c:6703) 
[    3.321556] net_rx_action (net/core/dev.c:6774 net/core/dev.c:6886) 
[    3.321591] __do_softirq (kernel/softirq.c:553) 
[    3.321624] do_softirq (kernel/softirq.c:454 kernel/softirq.c:441) 
[    3.321660]  </IRQ>
[    3.321681]  <TASK>
[    3.321710] __local_bh_enable_ip (kernel/softirq.c:381) 
[    3.321744] __dev_queue_xmit (net/core/dev.c:4400) 
[    3.321773] ? eth_header (net/ethernet/eth.c:85) 
[    3.321805] ip6_finish_output2 (./include/net/neighbour.h:542 net/ipv6/ip6_output.c:137) 
[    3.321842] ? kmem_cache_alloc (mm/slub.c:3843 mm/slub.c:3867) 
[    3.321880] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
[    3.321908] mld_sendpack (net/ipv6/mcast.c:1822) 
[    3.321942] mld_dad_work (net/ipv6/mcast.c:2260) 
[    3.321978] process_one_work (kernel/workqueue.c:2633) 
[    3.322017] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[    3.322056] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[    3.322096] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[    3.322139] kthread (kernel/kthread.c:388) 
[    3.322169] ? __pfx_kthread (kernel/kthread.c:341) 
[    3.322202] ret_from_fork (arch/x86/kernel/process.c:147) 
[    3.322243] ? __pfx_kthread (kernel/kthread.c:341) 


Finger prints:
__skb_checksum:__skb_checksum_complete:icmp_rcv:ip_protocol_deliver_rcu