======================================
| [    2.755945] br1: port 1(lag) entered forwarding state
| [    2.818504] ------------[ cut here ]------------
| [    2.818549] kernel BUG at net/core/skbuff.c:3505!
| [    2.818590] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
[    2.818670] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[    2.818733] Workqueue: mld mld_ifc_work
[    2.818764] RIP: 0010:__skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 2.818795] 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
[    2.818890] RSP: 0018:ffffbc1d40114c08 EFLAGS: 00010202
[    2.818922] RAX: 0000000000000086 RBX: 0000000000000008 RCX: ffff9b7781edc600
[    2.818966] RDX: ffff9b7781289780 RSI: 0000000000000100 RDI: ffff9b7781289680
[    2.819010] RBP: ffffbc1d40114c60 R08: ffffbc1d40114c60 R09: 0000000075d80303
[    2.819054] R10: 0000000000000008 R11: ffff9b77844983c0 R12: ffffffffba4bba80
[    2.819098] R13: 0000000000000008 R14: 0000000000000000 R15: 0000000075d80303
[    2.819138] FS:  0000000000000000(0000) GS:ffff9b77bed00000(0000) knlGS:0000000000000000
[    2.819181] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.819217] CR2: 00007f49060bb000 CR3: 0000000015a3e005 CR4: 0000000000770ef0
[    2.819262] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    2.819305] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    2.819344] PKRU: 55555554
[    2.819356] Call Trace:
[    2.819372]  <IRQ>
[    2.819388] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) 
[    2.819416] ? do_trap (arch/x86/kernel/traps.c:113 arch/x86/kernel/traps.c:154) 
[    2.819440] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[    2.819465] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:175) 
[    2.819490] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[    2.819509] ? exc_invalid_op (arch/x86/kernel/traps.c:265) 
[    2.819534] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[    2.819553] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[    2.819579] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[    2.819603] ? __skb_checksum (./include/net/checksum.h:121 (discriminator 1) net/core/skbuff.c:3439 (discriminator 1)) 
[    2.819629] __skb_checksum_complete (./arch/x86/include/asm/checksum_64.h:170 ./arch/x86/include/asm/checksum_64.h:180 net/core/skbuff.c:3643) 
[    2.819660] ? __pfx_csum_partial_ext (./include/net/checksum.h:120) 
[    2.819692] ? __pfx_csum_block_add_ext (./include/net/checksum.h:103) 
[    2.819723] icmp_rcv (./include/linux/skbuff.h:4567 net/ipv4/icmp.c:1213) 
[    2.819750] ip_protocol_deliver_rcu (net/ipv4/ip_input.c:205 (discriminator 5)) 
[    2.819787] ip_local_deliver_finish (./include/linux/rcupdate.h:782 net/ipv4/ip_input.c:234) 
[    2.819817] __netif_receive_skb_one_core (net/core/dev.c:5610 (discriminator 4)) 
[    2.819850] netif_receive_skb (net/core/dev.c:5810 net/core/dev.c:5869) 
[    2.819875] ? br_pass_frame_up (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:207 ./include/linux/netfilter.h:234 ./include/linux/netfilter.h:312 net/bridge/br_input.c:68) bridge
[    2.819941] br_handle_frame_finish (net/bridge/br_input.c:216) bridge
[    2.819987] ? skb_release_data (net/core/skbuff.c:1153) 
[    2.820012] br_handle_frame (net/bridge/br_input.c:417) bridge
[    2.820052] __netif_receive_skb_core.constprop.0 (net/core/dev.c:5504) 
[    2.820091] ? gre_rcv (net/ipv4/gre_demux.c:165) gre
[    2.820116] ? ip_protocol_deliver_rcu (net/ipv4/ip_input.c:205 (discriminator 5)) 
[    2.820147] __netif_receive_skb_one_core (net/core/dev.c:5609) 
[    2.820178] process_backlog (./include/linux/rcupdate.h:782 net/core/dev.c:6053) 
[    2.820203] __napi_poll (net/core/dev.c:6703) 
[    2.820230] net_rx_action (net/core/dev.c:6774 net/core/dev.c:6886) 
[    2.820254] __do_softirq (kernel/softirq.c:553) 
[    2.820280] do_softirq (kernel/softirq.c:454 kernel/softirq.c:441) 
[    2.820307]  </IRQ>
[    2.820319]  <TASK>
[    2.820332] __local_bh_enable_ip (kernel/softirq.c:381) 
[    2.820357] __dev_queue_xmit (net/core/dev.c:4400) 
[    2.820383] ip6_finish_output2 (./include/linux/netdevice.h:3172 ./include/net/neighbour.h:526 ./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
[    2.820410] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
[    2.820434] mld_sendpack (net/ipv6/mcast.c:1822) 
[    2.820459] mld_ifc_work (net/ipv6/mcast.c:2652) 
[    2.820483] process_one_work (kernel/workqueue.c:2633) 
[    2.820508] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[    2.820539] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[    2.820564] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[    2.820595] kthread (kernel/kthread.c:388) 
[    2.820620] ? __pfx_kthread (kernel/kthread.c:341) 
[    2.820645] ret_from_fork (arch/x86/kernel/process.c:147) 
[    2.820670] ? __pfx_kthread (kernel/kthread.c:341) 


Finger prints:
__skb_checksum:__skb_checksum_complete:icmp_rcv:ip_protocol_deliver_rcu