======================================
| [   30.627323][   T23] br0: port 2(eth1) entered forwarding state
| [   31.790328][    C2] ------------[ cut here ]------------
| [   31.790680][    C2] kernel BUG at net/core/skbuff.c:3505!
| [   31.790893][    C2] invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
[   31.791367][    C2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 31.791750][ C2] RIP: 0010:__skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 31.791931][ C2] 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 27 9e 8b 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 27 9e 8b fe       	call   0xfffffffffe8b9e66
  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 27 9e 8b fe       	call   0xfffffffffe8b9e3c
  15:	8b                   	.byte 0x8b
[   31.792544][    C2] RSP: 0018:ffffc900002206a0 EFLAGS: 00010202
[   31.792762][    C2] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffff11000997ca1
[   31.793016][    C2] RDX: 0000000000000040 RSI: 0000000000000000 RDI: ffff888004cbe508
[   31.793271][    C2] RBP: 0000000000000000 R08: ffffc90000220760 R09: fffffbfff769f30a
[   31.793527][    C2] R10: ffffffffbb4f9857 R11: ffffc90000220788 R12: 0000000000000000
[   31.793776][    C2] R13: 0000000000000000 R14: ffffc90000220760 R15: ffff8880077515c0
[   31.794029][    C2] FS:  00007f1c4ae59300(0000) GS:ffff888036100000(0000) knlGS:0000000000000000
[   31.794321][    C2] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   31.794541][    C2] CR2: 00007f1c4b0e8840 CR3: 00000000076de002 CR4: 0000000000770ef0
[   31.794798][    C2] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   31.795041][    C2] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   31.795291][    C2] PKRU: 55555554
[   31.795417][    C2] Call Trace:
[   31.795553][    C2]  <IRQ>
[ 31.795640][ C2] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) 
[ 31.795767][ C2] ? do_trap (arch/x86/kernel/traps.c:113 arch/x86/kernel/traps.c:154) 
[ 31.795907][ C2] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 31.796076][ C2] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:175) 
[ 31.796247][ C2] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 31.796411][ C2] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 31.796572][ C2] ? handle_invalid_op (arch/x86/kernel/traps.c:213) 
[ 31.796746][ C2] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 31.796909][ C2] ? exc_invalid_op (arch/x86/kernel/traps.c:265) 
[ 31.797078][ C2] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 31.797259][ C2] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 31.797424][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 31.797596][ C2] __skb_checksum_complete (net/core/skbuff.c:3643) 
[ 31.797769][ C2] ? __pfx___skb_checksum_complete (net/core/skbuff.c:3637) 
[ 31.797974][ C2] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 31.798140][ C2] ? __pfx_csum_partial_ext (./include/net/checksum.h:120) 
[ 31.798307][ C2] ? __pfx_csum_block_add_ext (./include/net/checksum.h:103) 
[ 31.798475][ C2] icmp_rcv (./include/linux/skbuff.h:4567 net/ipv4/icmp.c:1213) 
[ 31.798610][ C2] ip_protocol_deliver_rcu (net/ipv4/ip_input.c:205 (discriminator 5)) 
[ 31.798788][ C2] ip_local_deliver_finish.constprop.0 (./include/linux/rcupdate.h:779 net/ipv4/ip_input.c:234) 
[ 31.798995][ C2] ? ip_rcv (./include/linux/skbuff.h:1136 ./include/net/dst.h:460 net/ipv4/ip_input.c:449 ./include/linux/netfilter.h:422 net/ipv4/ip_input.c:569) 
[ 31.799124][ C2] ? __pfx_ip_rcv (net/ipv4/ip_input.c:562) 
[ 31.799285][ C2] __netif_receive_skb_one_core (net/core/dev.c:5610 (discriminator 4)) 
[ 31.799492][ C2] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5603) 
[ 31.799701][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 31.799869][ C2] ? 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)) 
[ 31.800077][ C2] netif_receive_skb_internal (net/core/dev.c:5810) 
[ 31.800239][ C2] ? __pfx_netif_receive_skb_internal (net/core/dev.c:5789) 
[ 31.800445][ C2] ? fdb_find_rcu (./include/linux/rhashtable.h:648 (discriminator 3) net/bridge/br_fdb.c:223 (discriminator 3)) 
[ 31.800615][ C2] ? __pfx_fdb_find_rcu (net/bridge/br_fdb.c:215) 
[ 31.800780][ C2] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[ 31.800988][ C2] netif_receive_skb (net/core/dev.c:5869) 
[ 31.801157][ C2] br_handle_frame_finish (net/bridge/br_input.c:216) 
[ 31.801326][ C2] ? __pfx_br_handle_frame_finish (net/bridge/br_input.c:75) 
[ 31.801532][ C2] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 31.801700][ C2] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 31.801826][ C2] br_handle_frame (net/bridge/br_input.c:417) 
[ 31.801999][ C2] ? __pfx_br_handle_frame (net/bridge/br_input.c:321) 
[ 31.802162][ C2] __netif_receive_skb_core.constprop.0 (net/core/dev.c:5504) 
[ 31.802373][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 31.802545][ C2] ? __pfx___netif_receive_skb_core.constprop.0 (net/core/dev.c:5397) 
[ 31.802753][ C2] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 31.802920][ C2] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:6051) 
[ 31.803083][ C2] __netif_receive_skb_one_core (net/core/dev.c:5609) 
[ 31.803292][ C2] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5603) 
[ 31.803504][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 31.803667][ C2] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:6051) 
[ 31.803833][ C2] process_backlog (./include/linux/rcupdate.h:779 net/core/dev.c:6053) 
[ 31.804005][ C2] __napi_poll.constprop.0 (net/core/dev.c:6703) 
[ 31.804171][ C2] net_rx_action (net/core/dev.c:6772 net/core/dev.c:6886) 
[ 31.804337][ C2] ? __pfx_net_rx_action (net/core/dev.c:6850) 
[ 31.804501][ C2] ? hlock_class (kernel/locking/lockdep.c:223) 
[ 31.804676][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 31.804837][ C2] __do_softirq (kernel/softirq.c:553) 
[ 31.805000][ C2] ? __neigh_event_send (./include/linux/bottom_half.h:33 net/core/neighbour.c:1245) 
[ 31.805164][ C2] do_softirq (kernel/softirq.c:454 kernel/softirq.c:441) 
[   31.805293][    C2]  </IRQ>
[   31.805377][    C2]  <TASK>
[ 31.805472][ C2] __local_bh_enable_ip (kernel/softirq.c:381) 
[ 31.805634][ C2] __neigh_event_send (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:207 ./include/trace/events/neigh.h:237 net/core/neighbour.c:1246) 
[ 31.805799][ C2] neigh_resolve_output (net/core/neighbour.c:1547) 
[ 31.805965][ C2] ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:77 kernel/softirq.c:386) 
[ 31.806132][ C2] ? ___neigh_create (net/core/neighbour.c:722 (discriminator 9)) 
[ 31.806297][ C2] ip_finish_output2 (./include/net/neighbour.h:542 net/ipv4/ip_output.c:235) 
[ 31.806462][ C2] ? __ip_make_skb (net/ipv4/ip_output.c:1379 net/ipv4/ip_output.c:1487) 
[ 31.806629][ C2] ? __pfx_ip_finish_output2 (net/ipv4/ip_output.c:199) 
[ 31.806793][ C2] ? __ip_finish_output (./include/linux/skbuff.h:1624 ./include/linux/skbuff.h:4942 net/ipv4/ip_output.c:307) 
[ 31.806956][ C2] ip_push_pending_frames (net/ipv4/ip_output.c:1497 net/ipv4/ip_output.c:1516) 
[ 31.807120][ C2] ? raw_sendmsg (net/ipv4/raw.c:641) 
[ 31.807280][ C2] raw_sendmsg (net/ipv4/raw.c:648) 
[ 31.807445][ C2] ? __pfx_raw_sendmsg (net/ipv4/raw.c:476) 
[ 31.807607][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 31.807780][ C2] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 31.807947][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 31.808112][ C2] ? __might_fault (mm/memory.c:6080 mm/memory.c:6073) 
[ 31.808285][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 31.808450][ C2] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 31.808618][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 31.808779][ C2] ? __might_fault (mm/memory.c:6080 mm/memory.c:6073) 
[ 31.808947][ C2] ? __might_fault (mm/memory.c:6080 mm/memory.c:6073) 
[ 31.809111][ C2] ? __sys_sendto (net/socket.c:730 net/socket.c:745 net/socket.c:2191) 
[ 31.809279][ C2] __sys_sendto (net/socket.c:730 net/socket.c:745 net/socket.c:2191) 
[ 31.809448][ C2] ? __pfx___sys_sendto (net/socket.c:2161) 
[ 31.809615][ C2] ? do_user_addr_fault (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 ./include/linux/mm.h:686 arch/x86/mm/fault.c:1357) 
[ 31.809781][ C2] ? reacquire_held_locks (kernel/locking/lockdep.c:5279) 
[ 31.809951][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 31.810116][ C2] ? do_user_addr_fault (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 ./include/linux/mm.h:688 arch/x86/mm/fault.c:1357) 
[ 31.810288][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 31.810450][ C2] ? __up_read (./arch/x86/include/asm/atomic64_64.h:79 ./include/linux/atomic/atomic-arch-fallback.h:2735 ./include/linux/atomic/atomic-long.h:184 ./include/linux/atomic/atomic-instrumented.h:3289 kernel/locking/rwsem.c:1347) 
[ 31.810620][ C2] ? __pfx___up_read (kernel/locking/rwsem.c:1339) 
[ 31.810789][ C2] ? do_user_addr_fault (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 ./include/linux/mm.h:688 arch/x86/mm/fault.c:1357) 
[ 31.810957][ C2] __x64_sys_sendto (net/socket.c:2199) 
[ 31.811127][ C2] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 31.811333][ C2] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 31.811501][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   31.811709][    C2] RIP: 0033:0x7f1c4b12f85a
[ 31.811880][ C2] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89
All code
========
   0:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   4:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   b:	eb b8                	jmp    0xffffffffffffffc5
   d:	0f 1f 00             	nopl   (%rax)
  10:	f3 0f 1e fa          	endbr64
  14:	41 89 ca             	mov    %ecx,%r10d
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 15                	jne    0x38
  23:	b8 2c 00 00 00       	mov    $0x2c,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 7e                	ja     0xb0
  32:	c3                   	ret
  33:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  38:	41 54                	push   %r12
  3a:	48 83 ec 30          	sub    $0x30,%rsp
  3e:	44                   	rex.R
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 7e                	ja     0x86
   8:	c3                   	ret
   9:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   e:	41 54                	push   %r12
  10:	48 83 ec 30          	sub    $0x30,%rsp
  14:	44                   	rex.R
  15:	89                   	.byte 0x89
[   31.812467][    C2] RSP: 002b:00007ffd5f65f468 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   31.812719][    C2] RAX: ffffffffffffffda RBX: 0000000000000038 RCX: 00007f1c4b12f85a
[   31.812971][    C2] RDX: 0000000000000040 RSI: 0000000002208340 RDI: 0000000000000005
[   31.813219][    C2] RBP: 00007ffd5f65f4c0 R08: 00000000004185e0 R09: 0000000000000010
[   31.813469][    C2] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000054


Finger prints:
__skb_checksum:__skb_checksum_complete:icmp_rcv:ip_protocol_deliver_rcu