======================================
| [   34.672478][  T340] br2: port 2(veth2.20) entered forwarding state
| [   36.963835][    C1] ------------[ cut here ]------------
| [   36.964115][    C1] kernel BUG at net/core/skbuff.c:3505!
| [   36.964299][    C1] invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
[   36.964712][    C1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   36.965049][    C1] Workqueue: mld mld_ifc_work
[ 36.965211][ C1] RIP: 0010:__skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 36.965363][ C1] 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
[   36.965875][    C1] RSP: 0018:ffffc900001c8920 EFLAGS: 00010206
[   36.966059][    C1] RAX: 000000000000f414 RBX: 0000000000000008 RCX: 1ffff11000b370f9
[   36.966275][    C1] RDX: 00000000000000a6 RSI: dffffc0000000000 RDI: ffff8880059b87c8
[   36.966513][    C1] RBP: 000000000000f414 R08: 0000000000000008 R09: fffffbfff639c5ea
[   36.966734][    C1] R10: ffffffffb1ce2f57 R11: dffffc0000000000 R12: 0000000000000008
[   36.966952][    C1] R13: 0000000000000000 R14: ffffc900001c89e0 R15: ffff88800a47c288
[   36.967177][    C1] FS:  0000000000000000(0000) GS:ffff888036080000(0000) knlGS:0000000000000000
[   36.967432][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   36.967625][    C1] CR2: 00007f82ad16b000 CR3: 0000000029f1e005 CR4: 0000000000770ef0
[   36.967850][    C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   36.968071][    C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   36.968291][    C1] PKRU: 55555554
[   36.968402][    C1] Call Trace:
[   36.968511][    C1]  <IRQ>
[ 36.968586][ C1] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) 
[ 36.968701][ C1] ? do_trap (arch/x86/kernel/traps.c:113 arch/x86/kernel/traps.c:154) 
[ 36.968810][ C1] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 36.968963][ C1] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:175) 
[ 36.969110][ C1] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 36.969260][ C1] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 36.969405][ C1] ? handle_invalid_op (arch/x86/kernel/traps.c:213) 
[ 36.969551][ C1] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 36.969700][ C1] ? exc_invalid_op (arch/x86/kernel/traps.c:265) 
[ 36.969847][ C1] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 36.970008][ C1] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 36.970154][ C1] __skb_checksum_complete (net/core/skbuff.c:3643) 
[ 36.970310][ C1] ? __pfx___skb_checksum_complete (net/core/skbuff.c:3637) 
[ 36.970492][ C1] ? __pfx_csum_partial_ext (./include/net/checksum.h:120) 
[ 36.970635][ C1] ? __pfx_csum_block_add_ext (./include/net/checksum.h:103) 
[ 36.970792][ C1] icmp_rcv (./include/linux/skbuff.h:4567 net/ipv4/icmp.c:1213) 
[ 36.970906][ C1] ip_protocol_deliver_rcu (net/ipv4/ip_input.c:205 (discriminator 5)) 
[ 36.971054][ C1] ip_local_deliver_finish (./include/linux/rcupdate.h:779 net/ipv4/ip_input.c:234) 
[ 36.971198][ C1] ip_local_deliver (./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv4/ip_input.c:254) 
[ 36.971345][ C1] ? __pfx_ip_local_deliver (net/ipv4/ip_input.c:243) 
[ 36.971494][ C1] ? ip_rcv_finish_core.constprop.0 (./include/linux/skbuff.h:1136 ./include/linux/skbuff.h:1188 net/ipv4/ip_input.c:390) 
[ 36.971674][ C1] ip_rcv (./include/net/dst.h:460 net/ipv4/ip_input.c:449 ./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv4/ip_input.c:569) 
[ 36.971783][ C1] ? __pfx_ip_rcv (net/ipv4/ip_input.c:562) 
[ 36.971926][ C1] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 36.972069][ C1] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:6051) 
[ 36.972215][ C1] ? __pfx_ip_rcv (net/ipv4/ip_input.c:562) 
[ 36.972429][ C1] __netif_receive_skb_one_core (net/core/dev.c:5610 (discriminator 4)) 
[ 36.972641][ C1] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5603) 
[ 36.972852][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 36.973025][ C1] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:6051) 
[ 36.973196][ C1] process_backlog (./include/linux/rcupdate.h:779 net/core/dev.c:6053) 
[ 36.973366][ C1] __napi_poll.constprop.0 (net/core/dev.c:6703) 
[ 36.973535][ C1] net_rx_action (net/core/dev.c:6772 net/core/dev.c:6886) 
[ 36.973709][ C1] ? __pfx_net_rx_action (net/core/dev.c:6850) 
[ 36.973875][ C1] ? hlock_class (kernel/locking/lockdep.c:223) 
[ 36.974044][ C1] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 36.974210][ C1] __do_softirq (kernel/softirq.c:553) 
[ 36.974384][ C1] ? ipv6_get_lladdr (./include/linux/rcupdate.h:779 net/ipv6/addrconf.c:1938) 
[ 36.974552][ C1] do_softirq (kernel/softirq.c:454 kernel/softirq.c:441) 
[   36.974682][    C1]  </IRQ>
[   36.974769][    C1]  <TASK>
[ 36.974856][ C1] __local_bh_enable_ip (kernel/softirq.c:381) 
[ 36.975034][ C1] ipv6_get_lladdr (./include/linux/rcupdate.h:779 net/ipv6/addrconf.c:1938) 
[ 36.975203][ C1] mld_newpack.isra.0 (net/ipv6/mcast.c:1763) 
[ 36.975372][ C1] ? __pfx_mld_newpack.isra.0 (net/ipv6/mcast.c:1725) 
[ 36.975540][ C1] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 36.975703][ C1] add_grhead (net/ipv4/igmp.c:451) 
[ 36.975832][ C1] add_grec (net/ipv4/igmp.c:520) 
[ 36.975959][ C1] ? __pfx_add_grec (net/ipv4/igmp.c:462) 
[ 36.976132][ C1] mld_send_cr (net/ipv6/mcast.c:2114) 
[ 36.976317][ C1] mld_ifc_work (net/ipv6/mcast.c:2652) 
[ 36.976495][ C1] process_one_work (kernel/workqueue.c:2633) 
[ 36.976671][ C1] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 36.976838][ C1] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 36.977007][ C1] ? assign_work (kernel/workqueue.c:1101) 
[ 36.977164][ C1] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 36.977324][ C1] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 36.977535][ C1] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 36.977710][ C1] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 36.977863][ C1] kthread (kernel/kthread.c:388) 
[ 36.977994][ C1] ? __pfx_kthread (kernel/kthread.c:341) 
[ 36.978168][ C1] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 36.978332][ C1] ? __pfx_kthread (kernel/kthread.c:341) 


Finger prints:
__skb_checksum:__skb_checksum_complete:icmp_rcv:ip_protocol_deliver_rcu