======================================
| xx__-> [    8.674198][  T166] ------------[ cut here ]------------
| [    8.674450][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: unshare/166
| [    8.674787][  T166] Modules linked in:
| [    8.675645][  T166] Tainted: [W]=WARN
[    8.675802][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.676017][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.676301][  T166] 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
[    8.676833][  T166] RSP: 0018:ffa0000000867ab0 EFLAGS: 00010286
[    8.677067][  T166] RAX: 00000000ffffffa6 RBX: ff11000001ef4940 RCX: 1ff400000010cf1c
[    8.677315][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000001ef49f0
[    8.677562][  T166] RBP: ff11000009ef9000 R08: 1fe22000003de93f R09: ff11000008f72e80
[    8.677817][  T166] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[    8.678084][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000009ef9000
[    8.678334][  T166] FS:  00007f5fa6e2b740(0000) GS:ff11000098cd3000(0000) knlGS:0000000000000000
[    8.678618][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.678848][  T166] CR2: 0000559978b42310 CR3: 000000000e862004 CR4: 0000000000771ef0
[    8.679113][  T166] PKRU: 55555554
[    8.679264][  T166] Call Trace:
[    8.679413][  T166]  <TASK>
[    8.679531][  T166]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    8.679726][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.679922][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.680122][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.680284][  T166]  register_netdevice (net/core/dev.c:11488)
[    8.680469][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.680694][  T166]  register_netdev (net/core/dev.c:11552)
[    8.680877][  T166]  loopback_net_init (drivers/net/loopback.c:218)
[    8.681140][  T166]  ops_init (net/core/net_namespace.c:137)
[    8.681351][  T166]  setup_net (net/core/net_namespace.c:446)
[    8.681553][  T166]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    8.681775][  T166]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    8.681958][  T166]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    8.682158][  T166]  copy_net_ns (net/core/net_namespace.c:579)
[    8.682342][  T166]  create_new_namespaces (kernel/nsproxy.c:132)
[    8.682537][  T166]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    8.682732][  T166]  ksys_unshare (kernel/fork.c:3243)
[    8.682916][  T166]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    8.683171][  T166]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    8.683354][  T166]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    8.683535][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.683723][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.683905][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.684099][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.684316][  T166] RIP: 0033:0x7f5fa6f26bcb
[    8.684505][  T166] 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
[    8.685031][  T166] RSP: 002b:00007ffd94f79ac8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    8.685296][  T166] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5fa6f26bcb
[    8.685541][  T166] RDX: 0000000000000000 RSI: 00007ffd94f79830 RDI: 0000000040000000
[    8.685798][  T166] RBP: 00007ffd94f79e50 R08: 00007ffd94f79a20 R09: 0000000000000000
[    8.686046][  T166] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    8.686304][  T166] R13: 0000000000000000 R14: 00000000ffffffff R15: 0000559978b45b68
| [    8.704763][  T166] ------------[ cut here ]------------
| [    8.704947][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/166
| [    8.705247][  T166] Modules linked in:
| [    8.705729][  T166] Tainted: [W]=WARN
[    8.705870][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.706084][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.706295][  T166] 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
[    8.706787][  T166] RSP: 0018:ffa0000000867b58 EFLAGS: 00010286
[    8.706990][  T166] RAX: 00000000ffffffa6 RBX: ff11000009f6e1c0 RCX: 1ff400000010cf31
[    8.707235][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009f6e270
[    8.707465][  T166] RBP: ff110000092c0000 R08: 1fe22000013edc4f R09: ff11000008f72e58
[    8.707707][  T166] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[    8.707939][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff110000092c0000
[    8.708184][  T166] FS:  0000000012d7d400(0000) GS:ff11000098cd3000(0000) knlGS:0000000000000000
[    8.708449][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.708654][  T166] CR2: 00007f5af8be9000 CR3: 000000000dbff005 CR4: 0000000000771ef0
[    8.708893][  T166] PKRU: 55555554
[    8.709033][  T166] Call Trace:
[    8.709186][  T166]  <TASK>
[    8.709298][  T166]  ? 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))
[    8.709469][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.709642][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.709824][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.709969][  T166]  register_netdevice (net/core/dev.c:11488)
[    8.710154][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.710354][  T166]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    8.710529][  T166]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    8.710710][  T166]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    8.710882][  T166]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    8.711026][  T166]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    8.711213][  T166]  ? build_open_flags (fs/open.c:1212)
[    8.711388][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.711560][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    8.711739][  T166]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    8.711914][  T166]  ? fput_close_sync (fs/file_table.c:615)
[    8.712099][  T166]  ? __ia32_sys_open (fs/open.c:1374)
[    8.712271][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.712449][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.712622][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.712803][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.712975][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.713184][  T166] RIP: 0033:0x47cc8d
[    8.713332][  T166] 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 
[    8.713822][  T166] RSP: 002b:00007ffc2e80f4a0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.714069][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.714300][  T166] RDX: 00007ffc2e80f520 RSI: 00000000400454ca RDI: 0000000000000005
[    8.714531][  T166] RBP: 00007ffc2e80f4f0 R08: 0000000000000000 R09: 0000000000000000
[    8.714772][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc2e80f9f8
[    8.715002][  T166] R13: 00007ffc2e80fa80 R14: 0000000000000002 R15: 0000000000543540
| [    8.717392][  T166] ------------[ cut here ]------------
| [    8.717555][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/166
| [    8.717848][  T166] Modules linked in:
| [    8.718492][  T166] Tainted: [W]=WARN
[    8.718630][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.718839][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.719059][  T166] 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
[    8.719536][  T166] RSP: 0018:ffa0000000867c58 EFLAGS: 00010286
[    8.719823][  T166] RAX: 00000000ffffffa6 RBX: ff11000009f6e940 RCX: 1ff400000010cf51
[    8.720066][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009f6e9f0
[    8.720295][  T166] RBP: ff110000092c0000 R08: 1fe22000013edd3f R09: ff11000008f72e58
[    8.720598][  T166] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000000
[    8.720839][  T166] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000002
[    8.721081][  T166] FS:  0000000012d7d400(0000) GS:ff11000098cd3000(0000) knlGS:0000000000000000
[    8.721339][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.721538][  T166] CR2: 00007f5af8be9000 CR3: 000000000dbff005 CR4: 0000000000771ef0
[    8.721855][  T166] PKRU: 55555554
[    8.721995][  T166] Call Trace:
[    8.722147][  T166]  <TASK>
[    8.722257][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    8.722427][  T166]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    8.722672][  T166]  notifier_call_chain (kernel/notifier.c:85)
[    8.722853][  T166]  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)
[    8.723026][  T166]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    8.723242][  T166]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    8.723487][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.723658][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.723841][  T166]  ? update_socket_protocol+0x10/0x10
[    8.724011][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    8.724266][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.724438][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.724608][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.724789][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.725034][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.725245][  T166] RIP: 0033:0x47cc8d
[    8.725388][  T166] 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 
[    8.725957][  T166] RSP: 002b:00007ffc2e80f4e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.726203][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.726508][  T166] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    8.726747][  T166] RBP: 00007ffc2e80f530 R08: 0000000000000000 R09: 0000000000000000
[    8.727066][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc2e80f9f8
[    8.727298][  T166] R13: 00007ffc2e80fa80 R14: 0000000000000002 R15: 0000000000543540
| [    8.729650][  T166] ------------[ cut here ]------------
| [    8.729833][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/166
| [    8.730233][  T166] Modules linked in:
| [    8.730811][  T166] Tainted: [W]=WARN
[    8.730956][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.731180][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.731399][  T166] 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
[    8.731997][  T166] RSP: 0018:ffa0000000867850 EFLAGS: 00010286
[    8.732307][  T166] RAX: 00000000ffffffa6 RBX: ff11000009f6e7c0 RCX: 1ff400000010ced0
[    8.732553][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009f6e870
[    8.732793][  T166] RBP: ff110000092c0000 R08: 1fe22000013edd0f R09: ff11000008f72e58
[    8.733126][  T166] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000001
[    8.733363][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000005828900
[    8.733599][  T166] FS:  0000000012d7d400(0000) GS:ff11000098cd3000(0000) knlGS:0000000000000000
[    8.733958][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.734178][  T166] CR2: 00007f5af8be9000 CR3: 000000000dbff005 CR4: 0000000000771ef0
[    8.734521][  T166] PKRU: 55555554
[    8.734667][  T166] Call Trace:
[    8.734816][  T166]  <TASK>
[    8.734929][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.735120][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.735264][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    8.735519][  T166]  __dev_notify_flags (net/core/dev.c:9787)
[    8.735700][  T166]  ? netif_change_name (net/core/dev.c:1495)
[    8.735875][  T166]  ? __dev_change_flags (net/core/dev.c:9752)
[    8.736065][  T166]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    8.736268][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    8.736464][  T166]  netif_change_flags (net/core/dev.c:9820)
[    8.736638][  T166]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    8.736835][  T166]  dev_change_flags (net/core/dev_api.c:68)
[    8.737010][  T166]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    8.737197][  T166]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    8.737374][  T166]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    8.737560][  T166]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    8.737794][  T166]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    8.737966][  T166]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    8.738159][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.738339][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.738596][  T166]  sock_do_ioctl (net/socket.c:1313)
[    8.738776][  T166]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    8.738961][  T166]  ? ioctl_file_clone (fs/ioctl.c:244)
[    8.739150][  T166]  sock_ioctl (net/socket.c:1434)
[    8.739376][  T166]  ? br_ioctl_call (net/socket.c:1279)
[    8.739550][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.739732][  T166]  ? update_socket_protocol+0x10/0x10
[    8.739904][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    8.740181][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.740358][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.740534][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.740713][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.740972][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.741187][  T166] RIP: 0033:0x47cc8d
[    8.741333][  T166] 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 
[    8.741941][  T166] RSP: 002b:00007ffc2e80f4c0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.742191][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.742509][  T166] RDX: 00007ffc2e80f530 RSI: 0000000000008914 RDI: 0000000000000006
[    8.742753][  T166] RBP: 00007ffc2e80f510 R08: 0000000000000000 R09: 0000000000000000
[    8.743004][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc2e80f9f8
[    8.743333][  T166] R13: 00007ffc2e80fa80 R14: 0000000000000002 R15: 0000000000543540
| [   98.524508][  T166] ------------[ cut here ]------------
| [   98.524741][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/166
| [   98.525079][  T166] Modules linked in:
| [   98.525610][  T166] Tainted: [W]=WARN
[   98.525762][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.525984][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.526237][  T166] 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
[   98.526752][  T166] RSP: 0018:ffa00000008676f0 EFLAGS: 00010286
[   98.526966][  T166] RAX: 00000000ffffffa6 RBX: ff1100000952c7c0 RCX: 1ff400000010cea4
[   98.527254][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000952c870
[   98.527506][  T166] RBP: ff110000092c0000 R08: 1fe22000012a590f R09: ff11000008f72e58
[   98.527750][  T166] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000041
[   98.528029][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ffa0000000867790
[   98.528351][  T166] FS:  0000000000000000(0000) GS:ff11000098cd3000(0000) knlGS:0000000000000000
[   98.528758][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.529090][  T166] CR2: 00007f62226aa6f0 CR3: 000000001b539001 CR4: 0000000000771ef0
[   98.529397][  T166] PKRU: 55555554
[   98.529636][  T166] Call Trace:
[   98.529876][  T166]  <TASK>
[   98.530064][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   98.530355][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   98.530593][  T166]  netif_close_many (net/core/dev.c:1804)
[   98.530827][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.531125][  T166]  ? __dev_close_many (net/core/dev.c:1781)
[   98.531400][  T166]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   98.531639][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   98.531854][  T166]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   98.532062][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.532277][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.532456][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.532637][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.532823][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.533038][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.533237][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.533451][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.533639][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.533820][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.534011][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.534219][  T166]  __fput (fs/file_table.c:510)
[   98.534372][  T166]  task_work_run (kernel/task_work.c:233)
[   98.534569][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.534751][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.534932][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.535137][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.535292][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.535481][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.535660][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.535846][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.536034][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.536245][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.536467][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.536649][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.536830][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.537021][  T166]  get_signal (kernel/signal.c:3037)
[   98.537220][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.537401][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.537583][  T166]  ? __sys_recvmsg (net/socket.c:2993)
[   98.537777][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.537963][  T166]  ? __sys_recvmsg_sock (net/socket.c:2974)
[   98.538165][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.538348][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.538561][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.538739][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.538921][  T166]  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)
[   98.539122][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.539301][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.539509][  T166] RIP: 0033:0x4c2d9e
[   98.539687][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.539926][  T166] RSP: 002b:00007ffc2e80ee50 EFLAGS: 00000202 ORIG_RAX: 000000000000002f
[   98.540210][  T166] RAX: 0000000000000050 RBX: 00007ffc2e80eee0 RCX: 00000000004c2d9e
[   98.540455][  T166] RDX: 0000000000000000 RSI: 00007ffc2e80eef0 RDI: 0000000000000007
[   98.540699][  T166] RBP: 00007ffc2e80ee60 R08: 0000000000000000 R09: 0000000000000000
[   98.540940][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc2e80eed4
[   98.541200][  T166] R13: 00007ffc2e80fa80 R14: 00007ffc2e80f020 R15: 0000000000543540
| [   98.553705][  T166] ------------[ cut here ]------------
| [   98.553914][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/166
| [   98.554235][  T166] Modules linked in:
| [   98.554725][  T166] Tainted: [W]=WARN
[   98.554867][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.555092][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.555308][  T166] 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
[   98.555812][  T166] RSP: 0018:ffa0000000867820 EFLAGS: 00010286
[   98.556027][  T166] RAX: 00000000ffffffa6 RBX: ff1100000952d3c0 RCX: 1ff400000010ceca
[   98.556558][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000952d470
[   98.556802][  T166] RBP: ff110000092c0000 R08: 1fe22000012a5a8f R09: ff11000008f72e58
[   98.557373][  T166] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[   98.557612][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.557849][  T166] FS:  0000000000000000(0000) GS:ff11000098cd3000(0000) knlGS:0000000000000000
[   98.558153][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.558363][  T166] CR2: 00007f62226aa6f0 CR3: 000000001b539001 CR4: 0000000000771ef0
[   98.558599][  T166] PKRU: 55555554
[   98.558740][  T166] Call Trace:
[   98.558881][  T166]  <TASK>
[   98.559001][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.559227][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.559435][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.559609][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.559782][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.559958][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.560154][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.560330][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.560503][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.560677][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.560854][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.561041][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.561231][  T166]  __fput (fs/file_table.c:510)
[   98.561380][  T166]  task_work_run (kernel/task_work.c:233)
[   98.561555][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.561727][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.561902][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.562097][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.562245][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.562417][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.562592][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.562769][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.562947][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.563142][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.563349][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.563523][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.563698][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.563874][  T166]  get_signal (kernel/signal.c:3037)
[   98.564078][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.564257][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.564434][  T166]  ? __sys_recvmsg (net/socket.c:2993)
[   98.564609][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.564791][  T166]  ? __sys_recvmsg_sock (net/socket.c:2974)
[   98.564970][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.565167][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.565375][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.565554][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.565732][  T166]  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)
[   98.565908][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.566133][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.566345][  T166] RIP: 0033:0x4c2d9e
[   98.566494][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.566702][  T166] RSP: 002b:00007ffc2e80ee50 EFLAGS: 00000202 ORIG_RAX: 000000000000002f
[   98.566939][  T166] RAX: 0000000000000050 RBX: 00007ffc2e80eee0 RCX: 00000000004c2d9e
[   98.567192][  T166] RDX: 0000000000000000 RSI: 00007ffc2e80eef0 RDI: 0000000000000007
[   98.567428][  T166] RBP: 00007ffc2e80ee60 R08: 0000000000000000 R09: 0000000000000000
[   98.567661][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc2e80eed4
[   98.567896][  T166] R13: 00007ffc2e80fa80 R14: 00007ffc2e80f020 R15: 0000000000543540
| [   98.588773][   T12] ------------[ cut here ]------------
| [   98.589026][   T12] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: 0/12
| [   98.589288][   T12] Modules linked in:
| [   98.589711][   T12] Tainted: [W]=WARN
[   98.589804][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.589955][   T12] Workqueue: netns cleanup_net
[   98.590174][   T12] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.590366][   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
[   98.590793][   T12] RSP: 0018:ffa00000000c7878 EFLAGS: 00010286
[   98.590966][   T12] RAX: 00000000ffffffa6 RBX: ff1100000952dcc0 RCX: 1ff4000000018ed5
[   98.591159][   T12] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000952dd70
[   98.591339][   T12] RBP: ff11000009ef9000 R08: 1fe22000012a5baf R09: ff11000001afd1d0
[   98.591523][   T12] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   98.591732][   T12] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.591930][   T12] FS:  0000000000000000(0000) GS:ff11000098bd3000(0000) knlGS:0000000000000000
[   98.592150][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.592299][   T12] CR2: 00007fa0f2b00680 CR3: 000000001b539003 CR4: 0000000000771ef0
[   98.592478][   T12] PKRU: 55555554
[   98.592582][   T12] Call Trace:
[   98.592672][   T12]  <TASK>
[   98.592736][   T12]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.592890][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.593043][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   98.593200][   T12]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   98.593343][   T12]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   98.593466][   T12]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   98.593612][   T12]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   98.593733][   T12]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   98.593853][   T12]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   98.593978][   T12]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   98.594108][   T12]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   98.594248][   T12]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.594397][   T12]  cleanup_net (net/core/net_namespace.c:702)
[   98.594517][   T12]  ? net_passive_dec (./include/linux/llist.h:241)
[   98.594638][   T12]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   98.594758][   T12]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   98.594876][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.595007][   T12]  process_one_work (kernel/workqueue.c:3314)
[   98.595142][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   98.595261][   T12]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.595386][   T12]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   98.595511][   T12]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.595631][   T12]  kthread (kernel/kthread.c:436)
[   98.595725][   T12]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.595876][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[   98.596024][   T12]  ret_from_fork (arch/x86/kernel/process.c:158)
[   98.596152][   T12]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   98.596301][   T12]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   98.596432][   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