======================================
| [   38.159304][  T358] br1: port 1(lag) entered forwarding state
| [   38.630750][    C1] ------------[ cut here ]------------
| [   38.631089][    C1] kernel BUG at net/core/skbuff.c:3505!
| [   38.631310][    C1] invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
[   38.631820][    C1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   38.632226][    C1] Workqueue: mld mld_dad_work
[ 38.632430][ C1] RIP: 0010:__skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 38.632613][ 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
[   38.633226][    C1] RSP: 0018:ffffc900001c8468 EFLAGS: 00010206
[   38.633450][    C1] RAX: 00000000000078db RBX: 0000000000000008 RCX: 1ffff11000b111c9
[   38.633722][    C1] RDX: 0000000000000072 RSI: dffffc0000000000 RDI: ffff888005888e48
[   38.633986][    C1] RBP: 00000000000078db R08: 0000000000000008 R09: fffffbfff321c5ea
[   38.634245][    C1] R10: ffffffff990e2f57 R11: ffffffff96cbf694 R12: 0000000000000008
[   38.634521][    C1] R13: 0000000000000000 R14: ffffc900001c8528 R15: ffff888005f23cc8
[   38.634788][    C1] FS:  0000000000000000(0000) GS:ffff888036080000(0000) knlGS:0000000000000000
[   38.635091][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   38.635314][    C1] CR2: 000055da2cfd4dec CR3: 00000000079d8004 CR4: 0000000000770ef0
[   38.635579][    C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   38.635841][    C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   38.636101][    C1] PKRU: 55555554
[   38.636233][    C1] Call Trace:
[   38.636365][    C1]  <IRQ>
[ 38.636453][ C1] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) 
[ 38.636588][ C1] ? do_trap (arch/x86/kernel/traps.c:113 arch/x86/kernel/traps.c:154) 
[ 38.636729][ C1] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 38.636911][ C1] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:175) 
[ 38.637092][ C1] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 38.637271][ C1] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 38.637452][ C1] ? handle_invalid_op (arch/x86/kernel/traps.c:213) 
[ 38.637632][ C1] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 38.637810][ C1] ? exc_invalid_op (arch/x86/kernel/traps.c:265) 
[ 38.637993][ C1] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 38.638181][ C1] ? dst_init (net/core/dst.c:53) 
[ 38.638316][ C1] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 38.638490][ C1] ? __skb_checksum (net/core/skbuff.c:3441 (discriminator 4)) 
[ 38.638671][ C1] __skb_checksum_complete (net/core/skbuff.c:3643) 
[ 38.638854][ C1] ? __pfx___skb_checksum_complete (net/core/skbuff.c:3637) 
[ 38.639082][ C1] ? __pfx_csum_partial_ext (./include/net/checksum.h:120) 
[ 38.639262][ C1] ? __pfx_csum_block_add_ext (./include/net/checksum.h:103) 
[ 38.639438][ C1] icmp_rcv (./include/linux/skbuff.h:4567 net/ipv4/icmp.c:1213) 
[ 38.639581][ C1] ip_protocol_deliver_rcu (net/ipv4/ip_input.c:205 (discriminator 5)) 
[ 38.639765][ C1] ip_local_deliver_finish (./include/linux/rcupdate.h:779 net/ipv4/ip_input.c:234) 
[ 38.639946][ C1] ip_local_deliver (./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv4/ip_input.c:254) 
[ 38.640126][ C1] ? __pfx_ip_local_deliver (net/ipv4/ip_input.c:243) 
[ 38.640305][ C1] ? ip_rcv_finish_core.constprop.0 (net/ipv4/ip_input.c:367) 
[ 38.640644][ 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) 
[ 38.640780][ C1] ? __pfx_ip_rcv (net/ipv4/ip_input.c:562) 
[ 38.641068][ C1] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 38.641252][ C1] ? netif_receive_skb_internal (./include/linux/rcupdate.h:298 (discriminator 16) ./include/linux/rcupdate.h:750 (discriminator 16) net/core/dev.c:5797 (discriminator 16)) 
[ 38.641481][ C1] ? __pfx_ip_rcv (net/ipv4/ip_input.c:562) 
[ 38.641655][ C1] __netif_receive_skb_one_core (net/core/dev.c:5610 (discriminator 4)) 
[ 38.641988][ C1] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5603) 
[ 38.642236][ C1] ? br_vlan_lookup (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 ./include/linux/rhashtable.h:673 net/bridge/br_vlan.c:34) bridge
[ 38.642501][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 38.642676][ C1] ? netif_receive_skb_internal (./include/linux/rcupdate.h:298 (discriminator 16) ./include/linux/rcupdate.h:750 (discriminator 16) net/core/dev.c:5797 (discriminator 16)) 
[ 38.642896][ C1] netif_receive_skb_internal (net/core/dev.c:5810) 
[ 38.643076][ C1] ? __pfx_netif_receive_skb_internal (net/core/dev.c:5789) 
[ 38.643400][ C1] ? br_handle_vlan (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 net/bridge/br_private.h:754 net/bridge/br_vlan.c:505) bridge
[ 38.643615][ C1] netif_receive_skb (net/core/dev.c:5869) 
[ 38.643793][ C1] br_handle_frame_finish (net/bridge/br_input.c:216) bridge
[ 38.644046][ C1] ? gre_rcv (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 net/ipv4/gre_demux.c:164) gre
[ 38.644339][ C1] ? __pfx_br_handle_frame_finish (net/bridge/br_input.c:75) bridge
[ 38.644604][ C1] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 38.644777][ C1] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 38.644952][ C1] ? gre_rcv (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 net/ipv4/gre_demux.c:164) gre
[ 38.645240][ C1] ? gre_rcv (net/ipv4/gre_demux.c:172) gre
[ 38.645420][ C1] ? __pfx_nf_ingress (net/core/dev.c:5380) 
[ 38.645600][ C1] ? ip_local_deliver_finish (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 net/ipv4/ip_input.c:234) 
[ 38.645886][ C1] br_handle_frame (net/bridge/br_input.c:417) bridge
[ 38.646198][ C1] ? __pfx_br_handle_frame (net/bridge/br_input.c:321) bridge
[ 38.646463][ C1] __netif_receive_skb_core.constprop.0 (net/core/dev.c:5504) 
[ 38.646708][ C1] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 38.646861][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 38.647161][ C1] ? __pfx___netif_receive_skb_core.constprop.0 (net/core/dev.c:5397) 
[ 38.647388][ C1] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 38.647567][ C1] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:6051) 
[ 38.647750][ C1] __netif_receive_skb_one_core (net/core/dev.c:5609) 
[ 38.648185][ C1] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5603) 
[ 38.648403][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 38.648679][ C1] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:6051) 
[ 38.648855][ C1] process_backlog (./include/linux/rcupdate.h:779 net/core/dev.c:6053) 
[ 38.649130][ C1] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 38.649304][ C1] __napi_poll.constprop.0 (net/core/dev.c:6703) 
[ 38.649473][ C1] net_rx_action (net/core/dev.c:6772 net/core/dev.c:6886) 
[ 38.649644][ C1] ? __pfx_net_rx_action (net/core/dev.c:6850) 
[ 38.649934][ C1] ? hlock_class (kernel/locking/lockdep.c:223) 
[ 38.650112][ C1] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 38.650286][ C1] ? hrtimer_interrupt (kernel/time/hrtimer.c:1828) 
[ 38.650462][ C1] __do_softirq (kernel/softirq.c:553) 
[ 38.650640][ C1] ? __dev_queue_xmit (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:818 net/core/dev.c:4399) 
[ 38.650812][ C1] do_softirq (kernel/softirq.c:454 kernel/softirq.c:441) 
[   38.650947][    C1]  </IRQ>
[   38.651038][    C1]  <TASK>
[ 38.651126][ C1] __local_bh_enable_ip (kernel/softirq.c:381) 
[ 38.651298][ C1] ? __dev_queue_xmit (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:818 net/core/dev.c:4399) 
[ 38.651475][ C1] __dev_queue_xmit (net/core/dev.c:4400) 
[ 38.651652][ C1] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 38.651829][ C1] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 38.652049][ C1] ? __pfx___dev_queue_xmit (net/core/dev.c:4281) 
[ 38.652329][ C1] ? neigh_hh_output (./include/linux/seqlock.h:74 ./include/linux/seqlock.h:772 ./include/net/neighbour.h:496) 
[ 38.652507][ C1] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
[ 38.652686][ C1] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
[ 38.652863][ C1] ip6_output (./include/linux/netfilter.h:303 net/ipv6/ip6_output.c:243) 
[ 38.652998][ C1] ? __pfx_ip6_output (net/ipv6/ip6_output.c:230) 
[ 38.653288][ C1] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 38.653469][ C1] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 38.653646][ C1] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 38.653925][ C1] ? icmp6_dst_alloc (net/ipv6/route.c:3293) 
[ 38.654205][ C1] NF_HOOK.constprop.0 (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 ./include/linux/netfilter.h:238 ./include/linux/netfilter.h:312) 
[ 38.654387][ C1] ? __pfx_NF_HOOK.constprop.0 (./include/linux/netfilter.h:308) 
[ 38.654690][ C1] ? __pfx_xfrm_lookup_with_ifid (net/xfrm/xfrm_policy.c:3133) 
[ 38.654915][ C1] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 38.655255][ C1] ? icmp6_dst_alloc (net/ipv6/route.c:3293) 
[ 38.655434][ C1] ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:77 kernel/softirq.c:386) 
[ 38.655604][ C1] mld_sendpack (net/ipv6/mcast.c:1822) 
[ 38.655784][ C1] ? __pfx_mld_sendpack (net/ipv6/mcast.c:1779) 
[ 38.656079][ C1] mld_dad_work (net/ipv6/mcast.c:2260) 
[ 38.656257][ C1] process_one_work (kernel/workqueue.c:2633) 
[ 38.656547][ C1] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 38.656729][ C1] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 38.656906][ C1] ? assign_work (kernel/workqueue.c:1101) 
[ 38.657090][ C1] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 38.657269][ C1] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 38.657598][ C1] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 38.657780][ C1] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 38.658073][ C1] kthread (kernel/kthread.c:388) 
[ 38.658214][ C1] ? __pfx_kthread (kernel/kthread.c:341) 
[ 38.658400][ C1] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 38.658689][ C1] ? __pfx_kthread (kernel/kthread.c:341) 


Finger prints:
__skb_checksum:__skb_checksum_complete:icmp_rcv:ip_protocol_deliver_rcu