======================================
| xx__-> [   11.058562][  T167] ------------[ cut here ]------------
| [   11.058967][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: unshare/167
| [   11.059482][  T167] Modules linked in:
| [   11.060248][  T167] Tainted: [W]=WARN
[   11.060488][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   11.060814][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   11.061158][  T167] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   11.062068][  T167] RSP: 0018:ffa0000000847ab0 EFLAGS: 00010286
[   11.062410][  T167] RAX: 00000000ffffffa6 RBX: ff1100000953d540 RCX: 1ff4000000108f1c
[   11.062805][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000953d5f0
[   11.063183][  T167] RBP: ff11000002064000 R08: 1fe22000012a7abf R09: ff1100000cfd0b80
[   11.063595][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[   11.063976][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000002064000
[   11.064364][  T167] FS:  00007fd31cdb9740(0000) GS:ff1100007d0d3000(0000) knlGS:0000000000000000
[   11.064808][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   11.065136][  T167] CR2: 000055aa8b98a310 CR3: 000000000e933005 CR4: 0000000000771ef0
[   11.065538][  T167] PKRU: 55555554
[   11.065754][  T167] Call Trace:
[   11.065973][  T167]  <TASK>
[   11.066237][  T167]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[   11.066529][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   11.066803][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[   11.067078][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   11.067329][  T167]  register_netdevice (net/core/dev.c:11488)
[   11.067618][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[   11.067966][  T167]  register_netdev (net/core/dev.c:11552)
[   11.068243][  T167]  loopback_net_init (drivers/net/loopback.c:218)
[   11.068534][  T167]  ops_init (net/core/net_namespace.c:137)
[   11.068750][  T167]  setup_net (net/core/net_namespace.c:446)
[   11.068958][  T167]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[   11.069233][  T167]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[   11.069525][  T167]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[   11.069801][  T167]  copy_net_ns (net/core/net_namespace.c:579)
[   11.070074][  T167]  create_new_namespaces (kernel/nsproxy.c:132)
[   11.070358][  T167]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[   11.070644][  T167]  ksys_unshare (kernel/fork.c:3243)
[   11.070917][  T167]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[   11.071200][  T167]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[   11.071496][  T167]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[   11.071767][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   11.072040][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[   11.072320][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[   11.072607][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   11.072927][  T167] RIP: 0033:0x7fd31ceb4bcb
[   11.073208][  T167] Code: 73 01 c3 48 8b 0d 2d 82 0f 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d fd 81 0f 00 f7 d8 64 89 01 48
All code
========
   0:	73 01                	jae    0x3
   2:	c3                   	ret
   3:	48 8b 0d 2d 82 0f 00 	mov    0xf822d(%rip),%rcx        # 0xf8237
   a:	f7 d8                	neg    %eax
   c:	64 89 01             	mov    %eax,%fs:(%rcx)
   f:	48 83 c8 ff          	or     $0xffffffffffffffff,%rax
  13:	c3                   	ret
  14:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  1b:	00 00 00 
  1e:	90                   	nop
  1f:	f3 0f 1e fa          	endbr64
  23:	b8 10 01 00 00       	mov    $0x110,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax		<-- trapping instruction
  30:	73 01                	jae    0x33
  32:	c3                   	ret
  33:	48 8b 0d fd 81 0f 00 	mov    0xf81fd(%rip),%rcx        # 0xf8237
  3a:	f7 d8                	neg    %eax
  3c:	64 89 01             	mov    %eax,%fs:(%rcx)
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax
   6:	73 01                	jae    0x9
   8:	c3                   	ret
   9:	48 8b 0d fd 81 0f 00 	mov    0xf81fd(%rip),%rcx        # 0xf820d
  10:	f7 d8                	neg    %eax
  12:	64 89 01             	mov    %eax,%fs:(%rcx)
  15:	48                   	rex.W
[   11.074051][  T167] RSP: 002b:00007fffa600f628 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[   11.074439][  T167] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd31ceb4bcb
[   11.074832][  T167] RDX: 0000000000000000 RSI: 00007fffa600f390 RDI: 0000000040000000
[   11.075217][  T167] RBP: 00007fffa600f9b0 R08: 00007fffa600f580 R09: 0000000000000000
[   11.075608][  T167] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[   11.075975][  T167] R13: 0000000000000000 R14: 00000000ffffffff R15: 000055aa8b98db68
| [   11.117726][  T167] ------------[ cut here ]------------
| [   11.118050][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/167
| [   11.118523][  T167] Modules linked in:
| [   11.119261][  T167] Tainted: [W]=WARN
[   11.119483][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   11.119780][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   11.120092][  T167] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   11.120865][  T167] RSP: 0018:ffa0000000847b58 EFLAGS: 00010286
[   11.121154][  T167] RAX: 00000000ffffffa6 RBX: ff11000008cd50c0 RCX: 1ff4000000108f31
[   11.121523][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000008cd5170
[   11.121864][  T167] RBP: ff11000008e0c000 R08: 1fe220000119aa2f R09: ff1100000cfd0b58
[   11.122208][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[   11.122570][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000008e0c000
[   11.122914][  T167] FS:  0000000018ade400(0000) GS:ff1100007d0d3000(0000) knlGS:0000000000000000
[   11.123335][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   11.123660][  T167] CR2: 00007f3d367c3000 CR3: 0000000004b62006 CR4: 0000000000771ef0
[   11.124014][  T167] PKRU: 55555554
[   11.124225][  T167] Call Trace:
[   11.124422][  T167]  <TASK>
[   11.124591][  T167]  ? ip6_route_dev_notify (./include/net/net_namespace.h:419 (discriminator 1) ./include/linux/netdevice.h:2776 (discriminator 1) net/ipv6/route.c:6476 (discriminator 1))
[   11.124840][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   11.125089][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[   11.125346][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   11.125571][  T167]  register_netdevice (net/core/dev.c:11488)
[   11.125819][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[   11.126110][  T167]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[   11.126365][  T167]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[   11.126630][  T167]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[   11.126877][  T167]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[   11.127080][  T167]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[   11.127338][  T167]  ? build_open_flags (fs/open.c:1212)
[   11.127606][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[   11.127857][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   11.128107][  T167]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[   11.128360][  T167]  ? fput_close_sync (fs/file_table.c:615)
[   11.128623][  T167]  ? __ia32_sys_open (fs/open.c:1374)
[   11.128874][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[   11.129129][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   11.129385][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[   11.129646][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[   11.129897][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   11.130188][  T167] RIP: 0033:0x47cc8d
[   11.130405][  T167] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[   11.131146][  T167] RSP: 002b:00007ffc59a17150 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   11.131512][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[   11.131855][  T167] RDX: 00007ffc59a171d0 RSI: 00000000400454ca RDI: 0000000000000005
[   11.132193][  T167] RBP: 00007ffc59a171a0 R08: 0000000000000000 R09: 0000000000000000
[   11.132564][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc59a176a8
[   11.132913][  T167] R13: 00007ffc59a17730 R14: 0000000000000002 R15: 0000000000543540
| [   11.136297][  T167] ------------[ cut here ]------------
| [   11.136558][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/167
| [   11.137120][  T167] Modules linked in:
| [   11.138039][  T167] Tainted: [W]=WARN
[   11.138254][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   11.138580][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   11.138889][  T167] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   11.139801][  T167] RSP: 0018:ffa0000000847c58 EFLAGS: 00010286
[   11.140247][  T167] RAX: 00000000ffffffa6 RBX: ff11000008cd5cc0 RCX: 1ff4000000108f51
[   11.140594][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000008cd5d70
[   11.140929][  T167] RBP: ff11000008e0c000 R08: 1fe220000119abaf R09: ff1100000cfd0b58
[   11.141406][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000000
[   11.141766][  T167] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000002
[   11.142253][  T167] FS:  0000000018ade400(0000) GS:ff1100007d0d3000(0000) knlGS:0000000000000000
[   11.142654][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   11.142949][  T167] CR2: 00007f3d367c3000 CR3: 0000000004b62006 CR4: 0000000000771ef0
[   11.143442][  T167] PKRU: 55555554
[   11.143657][  T167] Call Trace:
[   11.143855][  T167]  <TASK>
[   11.144009][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   11.144254][  T167]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[   11.144651][  T167]  notifier_call_chain (kernel/notifier.c:85)
[   11.144903][  T167]  netdev_update_features (net/core/dev.c:2287 net/core/dev.c:2301 net/core/dev.c:1590 net/core/dev.c:11099 net/core/dev.c:11096)
[   11.145150][  T167]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[   11.145452][  T167]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[   11.145725][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[   11.145970][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[   11.146228][  T167]  ? update_socket_protocol+0x10/0x10
[   11.146486][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[   11.146737][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[   11.146986][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   11.147237][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[   11.147505][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[   11.147753][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   11.148037][  T167] RIP: 0033:0x47cc8d
[   11.148252][  T167] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[   11.148996][  T167] RSP: 002b:00007ffc59a17190 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   11.149344][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[   11.149839][  T167] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[   11.150179][  T167] RBP: 00007ffc59a171e0 R08: 0000000000000005 R09: 0000000000001ff0
[   11.150685][  T167] R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffc59a176a8
[   11.151022][  T167] R13: 00007ffc59a17730 R14: 0000000000000002 R15: 0000000000543540
| [   11.154826][  T167] ------------[ cut here ]------------
| [   11.155081][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/167
| [   11.155719][  T167] Modules linked in:
| [   11.156636][  T167] Tainted: [W]=WARN
[   11.156848][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   11.157166][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   11.157513][  T167] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   11.158481][  T167] RSP: 0018:ffa0000000847850 EFLAGS: 00010286
[   11.158951][  T167] RAX: 00000000ffffffa6 RBX: ff11000008cd5840 RCX: 1ff4000000108ed0
[   11.159324][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000008cd58f0
[   11.159698][  T167] RBP: ff11000008e0c000 R08: 1fe220000119ab1f R09: ff1100000cfd0b58
[   11.160224][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000001
[   11.160605][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000005890900
[   11.160973][  T167] FS:  0000000018ade400(0000) GS:ff1100007d0d3000(0000) knlGS:0000000000000000
[   11.161567][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   11.161882][  T167] CR2: 00007f3d367c3000 CR3: 0000000004b62006 CR4: 0000000000771ef0
[   11.162407][  T167] PKRU: 55555554
[   11.162630][  T167] Call Trace:
[   11.162843][  T167]  <TASK>
[   11.163012][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   11.163287][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   11.163666][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   11.163928][  T167]  __dev_notify_flags (net/core/dev.c:9787)
[   11.164173][  T167]  ? netif_change_name (net/core/dev.c:1495)
[   11.164442][  T167]  ? __dev_change_flags (net/core/dev.c:9752)
[   11.164867][  T167]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[   11.165138][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   11.165409][  T167]  netif_change_flags (net/core/dev.c:9820)
[   11.165687][  T167]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[   11.166101][  T167]  dev_change_flags (net/core/dev_api.c:68)
[   11.166373][  T167]  devinet_ioctl (net/ipv4/devinet.c:1199)
[   11.166653][  T167]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[   11.166918][  T167]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[   11.167342][  T167]  inet_ioctl (net/ipv4/af_inet.c:1011)
[   11.167596][  T167]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[   11.167852][  T167]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   11.168129][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[   11.168400][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[   11.168827][  T167]  sock_do_ioctl (net/socket.c:1313)
[   11.169093][  T167]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[   11.169369][  T167]  ? ioctl_file_clone (fs/ioctl.c:244)
[   11.169803][  T167]  sock_ioctl (net/socket.c:1434)
[   11.170018][  T167]  ? br_ioctl_call (net/socket.c:1279)
[   11.170292][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[   11.170579][  T167]  ? update_socket_protocol+0x10/0x10
[   11.170838][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[   11.171264][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[   11.171537][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   11.171800][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[   11.172067][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[   11.172510][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   11.172818][  T167] RIP: 0033:0x47cc8d
[   11.173040][  T167] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[   11.174010][  T167] RSP: 002b:00007ffc59a17170 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   11.174393][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[   11.174776][  T167] RDX: 00007ffc59a171e0 RSI: 0000000000008914 RDI: 0000000000000006
[   11.175137][  T167] RBP: 00007ffc59a171c0 R08: 0000000000000005 R09: 0000000000001ff0
[   11.175674][  T167] R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffc59a176a8
[   11.176047][  T167] R13: 00007ffc59a17730 R14: 0000000000000002 R15: 0000000000543540
| [  100.835942][  T167] ------------[ cut here ]------------
| [  100.836196][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/167
| [  100.836628][  T167] Modules linked in:
| [  100.837579][  T167] Tainted: [W]=WARN
[  100.837915][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  100.838382][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[  100.838741][  T167] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[  100.839351][  T167] RSP: 0018:ffa00000008476f0 EFLAGS: 00010286
[  100.839708][  T167] RAX: 00000000ffffffa6 RBX: ff1100000be307c0 RCX: 1ff4000000108ea4
[  100.840050][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000be30870
[  100.840364][  T167] RBP: ff11000008e0c000 R08: 1fe22000017c610f R09: ff1100000cfd0b58
[  100.840732][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000041
[  100.841077][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ffa0000000847790
[  100.841406][  T167] FS:  0000000000000000(0000) GS:ff1100007d0d3000(0000) knlGS:0000000000000000
[  100.841822][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  100.842141][  T167] CR2: 00007f80f05b76f0 CR3: 000000001e539003 CR4: 0000000000771ef0
[  100.842481][  T167] PKRU: 55555554
[  100.842736][  T167] Call Trace:
[  100.842976][  T167]  <TASK>
[  100.843170][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[  100.843461][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[  100.843785][  T167]  netif_close_many (net/core/dev.c:1804)
[  100.844120][  T167]  ? finish_task_switch.isra.0 (kernel/sched/sched.h:1644 kernel/sched/core.c:5125 kernel/sched/core.c:5243)
[  100.844430][  T167]  ? finish_task_switch.isra.0 (kernel/sched/sched.h:1644 kernel/sched/core.c:5125 kernel/sched/core.c:5243)
[  100.844730][  T167]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[  100.845014][  T167]  ? __dev_close_many (net/core/dev.c:1781)
[  100.845285][  T167]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[  100.845589][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[  100.845915][  T167]  ? preempt_schedule_notrace_thunk (arch/x86/entry/thunk.S:13)
[  100.846217][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[  100.846514][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[  100.846805][  T167]  ? irqentry_exit (./include/linux/irq-entry-common.h:507 ./include/linux/irq-entry-common.h:542 kernel/entry/common.c:164)
[  100.847072][  T167]  ? irqentry_exit (./include/linux/irq-entry-common.h:507 ./include/linux/irq-entry-common.h:542 kernel/entry/common.c:164)
[  100.847322][  T167]  ? lockdep_hardirqs_off (kernel/locking/lockdep.c:4511)
[  100.847621][  T167]  ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1061 (discriminator 37) arch/x86/kernel/apic/apic.c:1061 (discriminator 37))
[  100.847903][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[  100.848104][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[  100.848289][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[  100.848485][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2618)
[  100.848678][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[  100.848871][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[  100.849055][  T167]  __fput (fs/file_table.c:510)
[  100.849211][  T167]  task_work_run (kernel/task_work.c:233)
[  100.849405][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  100.849601][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[  100.849794][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[  100.849988][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[  100.850144][  T167]  ? exit_notify (kernel/exit.c:748)
[  100.850336][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  100.850535][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  100.850727][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[  100.850921][  T167]  do_group_exit (kernel/exit.c:1119)
[  100.851106][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[  100.851320][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  100.851517][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[  100.851713][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[  100.851910][  T167]  get_signal (kernel/signal.c:3037)
[  100.852104][  T167]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[  100.852300][  T167]  ? __ia32_sys_getpeername (net/socket.c:2219)
[  100.852494][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[  100.852689][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[  100.852874][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[  100.853058][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  100.853245][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[  100.853478][  T167]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[  100.853668][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  100.853859][  T167]  do_syscall_64 (./include/linux/irq-entry-common.h:207 ./include/linux/irq-entry-common.h:230 ./include/linux/entry-common.h:318 arch/x86/entry/syscall_64.c:100)
[  100.854047][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[  100.854230][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[  100.854445][  T167] RIP: 0033:0x4c2d9e
[  100.854615][  T167] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[  100.854876][  T167] RSP: 002b:00007ffc59a16b00 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[  100.855136][  T167] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[  100.855392][  T167] RDX: 0000000000000014 RSI: 00007ffc59a16be0 RDI: 0000000000000007
[  100.855682][  T167] RBP: 00007ffc59a16b10 R08: 00007ffc59a16ba0 R09: 000000000000000c
[  100.855995][  T167] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000018ae8280
[  100.856247][  T167] R13: 00007ffc59a17730 R14: 00007ffc59a16cd0 R15: 0000000000543540
| [  100.870912][  T167] ------------[ cut here ]------------
| [  100.871111][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/167
| [  100.871432][  T167] Modules linked in:
| [  100.872405][  T167] Tainted: [W]=WARN
[  100.872570][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  100.872796][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[  100.873018][  T167] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[  100.873550][  T167] RSP: 0018:ffa0000000847820 EFLAGS: 00010286
[  100.873774][  T167] RAX: 00000000ffffffa6 RBX: ff1100000be316c0 RCX: 1ff4000000108eca
[  100.874021][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000be31770
[  100.874268][  T167] RBP: ff11000008e0c000 R08: 1fe22000017c62ef R09: ff1100000cfd0b58
[  100.874542][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[  100.874798][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[  100.875054][  T167] FS:  0000000000000000(0000) GS:ff1100007d0d3000(0000) knlGS:0000000000000000
[  100.875333][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  100.875562][  T167] CR2: 00007fee6e31df98 CR3: 000000001e539003 CR4: 0000000000771ef0
[  100.875820][  T167] PKRU: 55555554
[  100.875968][  T167] Call Trace:
[  100.876117][  T167]  <TASK>
[  100.876235][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[  100.876456][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[  100.876685][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[  100.876872][  T167]  ? irqentry_exit (./include/linux/irq-entry-common.h:507 ./include/linux/irq-entry-common.h:542 kernel/entry/common.c:164)
[  100.877050][  T167]  ? irqentry_exit (./include/linux/irq-entry-common.h:507 ./include/linux/irq-entry-common.h:542 kernel/entry/common.c:164)
[  100.877230][  T167]  ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1061 (discriminator 37) arch/x86/kernel/apic/apic.c:1061 (discriminator 37))
[  100.877439][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[  100.877632][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[  100.877821][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[  100.878001][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2618)
[  100.878182][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[  100.878367][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[  100.878559][  T167]  __fput (fs/file_table.c:510)
[  100.878718][  T167]  task_work_run (kernel/task_work.c:233)
[  100.878897][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  100.879077][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[  100.879258][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[  100.879438][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[  100.879598][  T167]  ? exit_notify (kernel/exit.c:748)
[  100.879780][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  100.879962][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  100.880139][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[  100.880319][  T167]  do_group_exit (kernel/exit.c:1119)
[  100.880558][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[  100.880814][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  100.880993][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[  100.881171][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[  100.881349][  T167]  get_signal (kernel/signal.c:3037)
[  100.881543][  T167]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[  100.881729][  T167]  ? __ia32_sys_getpeername (net/socket.c:2219)
[  100.881911][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[  100.882092][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[  100.882273][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[  100.882454][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  100.882655][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[  100.882871][  T167]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[  100.883050][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  100.883234][  T167]  do_syscall_64 (./include/linux/irq-entry-common.h:207 ./include/linux/irq-entry-common.h:230 ./include/linux/entry-common.h:318 arch/x86/entry/syscall_64.c:100)
[  100.883413][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[  100.883609][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[  100.883823][  T167] RIP: 0033:0x4c2d9e
[  100.883981][  T167] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[  100.884194][  T167] RSP: 002b:00007ffc59a16b00 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[  100.884437][  T167] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[  100.884697][  T167] RDX: 0000000000000014 RSI: 00007ffc59a16be0 RDI: 0000000000000007
[  100.884939][  T167] RBP: 00007ffc59a16b10 R08: 00007ffc59a16ba0 R09: 000000000000000c
[  100.885178][  T167] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000018ae8280
[  100.885422][  T167] R13: 00007ffc59a17730 R14: 00007ffc59a16cd0 R15: 0000000000543540
| [  100.916526][   T12] ------------[ cut here ]------------
| [  100.916807][   T12] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: 0/12
| [  100.917191][   T12] Modules linked in:
| [  100.917924][   T12] Tainted: [W]=WARN
[  100.918069][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  100.918343][   T12] Workqueue: netns cleanup_net
[  100.918573][   T12] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[  100.918831][   T12] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[  100.919519][   T12] RSP: 0018:ffa00000000c7878 EFLAGS: 00010286
[  100.919801][   T12] RAX: 00000000ffffffa6 RBX: ff1100000ca45cc0 RCX: 1ff4000000018ed5
[  100.920092][   T12] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000ca45d70
[  100.920394][   T12] RBP: ff11000002064000 R08: 1fe2200001948baf R09: ff11000001afd1d0
[  100.920700][   T12] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[  100.920984][   T12] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[  100.921269][   T12] FS:  0000000000000000(0000) GS:ff1100007cfd3000(0000) knlGS:0000000000000000
[  100.921614][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  100.921860][   T12] CR2: 00007f1a34349f98 CR3: 000000001e539005 CR4: 0000000000771ef0
[  100.922144][   T12] PKRU: 55555554
[  100.922287][   T12] Call Trace:
[  100.922429][   T12]  <TASK>
[  100.922538][   T12]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[  100.922790][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[  100.923050][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[  100.923243][   T12]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[  100.923429][   T12]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[  100.923624][   T12]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[  100.923818][   T12]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[  100.924010][   T12]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[  100.924183][   T12]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[  100.924375][   T12]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[  100.924572][   T12]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[  100.924765][   T12]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  100.924961][   T12]  cleanup_net (net/core/net_namespace.c:702)
[  100.925148][   T12]  ? net_passive_dec (./include/linux/llist.h:241)
[  100.925334][   T12]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[  100.925535][   T12]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[  100.925729][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  100.925923][   T12]  process_one_work (kernel/workqueue.c:3314)
[  100.926120][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[  100.926309][   T12]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  100.926516][   T12]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[  100.926716][   T12]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[  100.926905][   T12]  kthread (kernel/kthread.c:436)
[  100.927049][   T12]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[  100.927284][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[  100.927483][   T12]  ret_from_fork (arch/x86/kernel/process.c:158)
[  100.927681][   T12]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[  100.927919][   T12]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[  100.928107][   T12]  ? kthread_affine_node (kernel/kthread.c:378)


Finger prints:
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:register_netdevice:register_netdev:loopback_net_init
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:register_netdevice:__tun_chr_ioctl:__x64_sys_ioctl
rtmsg_ifinfo_build_skb:unregister_netdevice_many_notify:unregister_netdevice_queue:__tun_detach:tun_chr_close
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:netif_close_many:unregister_netdevice_many_notify:unregister_netdevice_queue
rtmsg_ifinfo_build_skb:rtnetlink_event:notifier_call_chain:netdev_update_features:__tun_chr_ioctl
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:__dev_notify_flags:netif_change_flags:dev_change_flags
rtmsg_ifinfo_build_skb:unregister_netdevice_many_notify:default_device_exit_batch:ops_undo_list:cleanup_net