======================================
| [   44.033183][  T401] br2: port 2(vx2) entered forwarding state
| [   44.194673][    C0] ------------[ cut here ]------------
| [   44.195000][    C0] kernel BUG at net/core/skbuff.c:3505!
| [   44.195182][    C0] invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
[   44.195606][    C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 44.195951][ C0] RIP: 0010:__skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 44.196119][ C0] 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
[   44.196675][    C0] RSP: 0018:ffffc90000007888 EFLAGS: 00010202
[   44.196862][    C0] RAX: 0000000000000d0e RBX: 0000000000000008 RCX: 1ffff11000a6e509
[   44.197085][    C0] RDX: 0000000000000092 RSI: dffffc0000000000 RDI: ffff888005372848
[   44.197305][    C0] RBP: 0000000000000d0e R08: 0000000000000008 R09: ffffed10003999c9
[   44.197525][    C0] R10: ffff888003b3b5c8 R11: ffff888005372740 R12: 0000000000000008
[   44.197751][    C0] R13: 0000000000000000 R14: ffffc90000007948 R15: ffff888003b3b5c8
[   44.197973][    C0] FS:  0000000000000000(0000) GS:ffff888036000000(0000) knlGS:0000000000000000
[   44.198230][    C0] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   44.198416][    C0] CR2: 00007fe04787f270 CR3: 000000000571a001 CR4: 0000000000770ef0
[   44.198638][    C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   44.198865][    C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   44.199084][    C0] PKRU: 55555554
[   44.199195][    C0] Call Trace:
[   44.199307][    C0]  <IRQ>
[ 44.199383][ C0] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) 
[ 44.199514][ C0] ? do_trap (arch/x86/kernel/traps.c:113 arch/x86/kernel/traps.c:154) 
[ 44.199631][ C0] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 44.199782][ C0] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:175) 
[ 44.199935][ C0] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 44.200085][ C0] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 44.200235][ C0] ? handle_invalid_op (arch/x86/kernel/traps.c:213) 
[ 44.200382][ C0] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 44.200558][ C0] ? exc_invalid_op (arch/x86/kernel/traps.c:265) 
[ 44.200708][ C0] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 44.200863][ C0] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) 
[ 44.201023][ C0] ? __skb_checksum (net/core/skbuff.c:3441 (discriminator 4)) 
[ 44.201174][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 44.201328][ C0] ? 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) 
[ 44.201481][ C0] __skb_checksum_complete (net/core/skbuff.c:3643) 
[ 44.201633][ C0] ? __pfx___skb_checksum_complete (net/core/skbuff.c:3637) 
[ 44.201821][ C0] ? __pfx_csum_partial_ext (./include/net/checksum.h:120) 
[ 44.201970][ C0] ? __pfx_csum_block_add_ext (./include/net/checksum.h:103) 
[ 44.202127][ C0] ? ipv6_raw_deliver (net/ipv6/raw.c:142) 
[ 44.202280][ C0] icmpv6_rcv (./include/linux/skbuff.h:4567 net/ipv6/icmp.c:921) 
[ 44.202429][ C0] ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:438 (discriminator 5)) 
[ 44.202580][ C0] ? ip6_route_input (./include/linux/skbuff.h:1168 net/ipv6/route.c:2594) 
[ 44.202731][ C0] ip6_input_finish (./include/linux/rcupdate.h:779 net/ipv6/ip6_input.c:484) 
[ 44.202881][ C0] ip6_input (./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv6/ip6_input.c:492) 
[ 44.202991][ C0] ? __pfx_ip6_input (net/ipv6/ip6_input.c:491) 
[ 44.203141][ C0] ? ip6_rcv_core (./include/linux/skbuff.h:3181 net/ipv6/ip6_input.c:291) 
[ 44.203292][ C0] ipv6_rcv (./include/net/dst.h:460 net/ipv6/ip6_input.c:79 ./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv6/ip6_input.c:310) 
[ 44.203406][ C0] ? __pfx_ipv6_rcv (net/ipv6/ip6_input.c:304) 
[ 44.203558][ C0] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 44.203704][ C0] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:6051) 
[ 44.203865][ C0] ? __pfx_ipv6_rcv (net/ipv6/ip6_input.c:304) 
[ 44.204018][ C0] __netif_receive_skb_one_core (net/core/dev.c:5603) 
[ 44.204203][ C0] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5603) 
[ 44.204387][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 44.204535][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 44.204696][ C0] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:6051) 
[ 44.204844][ C0] process_backlog (./include/linux/rcupdate.h:779 net/core/dev.c:6053) 
[ 44.204994][ C0] __napi_poll.constprop.0 (net/core/dev.c:6703) 
[ 44.205143][ C0] net_rx_action (net/core/dev.c:6772 net/core/dev.c:6886) 
[ 44.205293][ C0] ? __pfx_net_rx_action (net/core/dev.c:6850) 
[ 44.205441][ C0] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) 
[ 44.205624][ C0] __do_softirq (kernel/softirq.c:553) 
[ 44.205775][ C0] irq_exit_rcu (kernel/softirq.c:427 kernel/softirq.c:632 kernel/softirq.c:644) 
[ 44.205890][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1076 (discriminator 14)) 
[   44.206039][    C0]  </IRQ>
[   44.206115][    C0]  <TASK>
[ 44.206193][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:649) 
[ 44.206384][ C0] RIP: 0010:_raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 44.206575][ C0] Code: 10 e8 f1 92 a3 fd 48 89 ef e8 19 ff a3 fd 81 e3 00 02 00 00 75 1d 9c 58 f6 c4 02 75 29 48 85 db 74 01 fb 65 ff 0d 15 25 19 52 <74> 0e 5b 5d c3 cc cc cc cc e8 3f bb c5 fd eb dc 0f 1f 44 00 00 5b
All code
========
   0:	10 e8                	adc    %ch,%al
   2:	f1                   	int1
   3:	92                   	xchg   %eax,%edx
   4:	a3 fd 48 89 ef e8 19 	movabs %eax,0xa3ff19e8ef8948fd
   b:	ff a3 
   d:	fd                   	std
   e:	81 e3 00 02 00 00    	and    $0x200,%ebx
  14:	75 1d                	jne    0x33
  16:	9c                   	pushf
  17:	58                   	pop    %rax
  18:	f6 c4 02             	test   $0x2,%ah
  1b:	75 29                	jne    0x46
  1d:	48 85 db             	test   %rbx,%rbx
  20:	74 01                	je     0x23
  22:	fb                   	sti
  23:	65 ff 0d 15 25 19 52 	decl   %gs:0x52192515(%rip)        # 0x5219253f
  2a:*	74 0e                	je     0x3a		<-- trapping instruction
  2c:	5b                   	pop    %rbx
  2d:	5d                   	pop    %rbp
  2e:	c3                   	ret
  2f:	cc                   	int3
  30:	cc                   	int3
  31:	cc                   	int3
  32:	cc                   	int3
  33:	e8 3f bb c5 fd       	call   0xfffffffffdc5bb77
  38:	eb dc                	jmp    0x16
  3a:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  3f:	5b                   	pop    %rbx

Code starting with the faulting instruction
===========================================
   0:	74 0e                	je     0x10
   2:	5b                   	pop    %rbx
   3:	5d                   	pop    %rbp
   4:	c3                   	ret
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	cc                   	int3
   9:	e8 3f bb c5 fd       	call   0xfffffffffdc5bb4d
   e:	eb dc                	jmp    0xffffffffffffffec
  10:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  15:	5b                   	pop    %rbx
[   44.207093][    C0] RSP: 0018:ffffc900009df9d8 EFLAGS: 00000286
[   44.207282][    C0] RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff5f5bf69
[   44.207510][    C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffadea8dc1
[   44.207735][    C0] RBP: ffffffffb18a4e90 R08: 0000000000000001 R09: fffffbfff5f5c5ea
[   44.207955][    C0] R10: ffffffffafae2f57 R11: ffffc900009df7a1 R12: dffffc0000000000
[   44.208174][    C0] R13: ffff888005431000 R14: 0000000000000000 R15: ffff888005432000
[ 44.208400][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 44.208584][ C0] __debug_check_no_obj_freed (lib/debugobjects.c:1000) 
[ 44.208739][ C0] ? __pfx___debug_check_no_obj_freed (lib/debugobjects.c:960) 
[ 44.208921][ C0] ? __virt_addr_valid (./arch/x86/include/asm/preempt.h:94 ./include/linux/rcupdate.h:865 ./include/linux/mmzone.h:2026 arch/x86/mm/physaddr.c:65) 
[ 44.209073][ C0] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 44.209261][ C0] kfree (mm/slub.c:2093 mm/slub.c:4299 mm/slub.c:4409) 
[ 44.209373][ C0] ? p9_req_put (net/9p/client.c:252 net/9p/client.c:405 net/9p/client.c:399) 
[ 44.209524][ C0] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 44.209713][ C0] p9_req_put (net/9p/client.c:252 net/9p/client.c:405 net/9p/client.c:399) 
[ 44.209825][ C0] p9_client_getattr_dotl (net/9p/client.c:1773) 
[ 44.209972][ C0] v9fs_vfs_getattr_dotl (fs/9p/vfs_inode_dotl.c:473) 
[ 44.210134][ C0] ovl_getattr (fs/overlayfs/overlayfs.h:416 fs/overlayfs/inode.c:174) 
[ 44.210295][ C0] ? __pfx_ovl_getattr (fs/overlayfs/inode.c:159) 
[ 44.210457][ C0] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 44.210620][ C0] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 44.210782][ C0] ? __might_fault (mm/memory.c:6080 mm/memory.c:6073) 
[ 44.210943][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 44.211108][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 44.211280][ C0] ? __might_fault (mm/memory.c:6080 mm/memory.c:6073) 
[ 44.211449][ C0] ? vfs_getattr_nosec (fs/stat.c:112) 
[ 44.211621][ C0] vfs_fstat (./include/linux/file.h:45 fs/stat.c:199) 
[ 44.211749][ C0] __do_sys_newfstatat (fs/stat.c:469) 
[ 44.211925][ C0] ? __pfx___do_sys_newfstatat (fs/stat.c:464) 
[ 44.212096][ C0] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 44.212308][ C0] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 44.212480][ C0] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   44.212690][    C0] RIP: 0033:0x7fe0479e2eae
[ 44.212869][ C0] Code: 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 07 00 00 00 0f 1f 80 00 00 00 00 f3 0f 1e fa 41 89 ca b8 06 01 00 00 0f 05 <3d> 00 f0 ff ff 77 0b 31 c0 c3 0f 1f 84 00 00 00 00 00 f7 d8 89 05
All code
========
   0:	48 89 f2             	mov    %rsi,%rdx
   3:	b9 00 01 00 00       	mov    $0x100,%ecx
   8:	48 89 fe             	mov    %rdi,%rsi
   b:	bf 9c ff ff ff       	mov    $0xffffff9c,%edi
  10:	e9 07 00 00 00       	jmp    0x1c
  15:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  1c:	f3 0f 1e fa          	endbr64
  20:	41 89 ca             	mov    %ecx,%r10d
  23:	b8 06 01 00 00       	mov    $0x106,%eax
  28:	0f 05                	syscall
  2a:*	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax		<-- trapping instruction
  2f:	77 0b                	ja     0x3c
  31:	31 c0                	xor    %eax,%eax
  33:	c3                   	ret
  34:	0f 1f 84 00 00 00 00 	nopl   0x0(%rax,%rax,1)
  3b:	00 
  3c:	f7 d8                	neg    %eax
  3e:	89                   	.byte 0x89
  3f:	05                   	.byte 0x5

Code starting with the faulting instruction
===========================================
   0:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   5:	77 0b                	ja     0x12
   7:	31 c0                	xor    %eax,%eax
   9:	c3                   	ret
   a:	0f 1f 84 00 00 00 00 	nopl   0x0(%rax,%rax,1)
  11:	00 
  12:	f7 d8                	neg    %eax
  14:	89                   	.byte 0x89
  15:	05                   	.byte 0x5
[   44.213464][    C0] RSP: 002b:00007ffd927dab18 EFLAGS: 00000206 ORIG_RAX: 0000000000000106
[   44.213721][    C0] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe0479e2eae
[   44.213979][    C0] RDX: 00007ffd927dabb0 RSI: 00007fe0479e6cfb RDI: 0000000000000005
[   44.214225][    C0] RBP: 00007ffd927dac70 R08: 00007fe04795a4e0 R09: 00007fe0479f2220
[   44.214470][    C0] R10: 0000000000001000 R11: 0000000000000206 R12: 00007fe0479f2220


Finger prints:
__skb_checksum:__skb_checksum_complete:icmpv6_rcv:ip6_protocol_deliver_rcu