======================================
| xx__-> [    8.804053][  T166] ------------[ cut here ]------------
| [    8.804263][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: unshare/166
| [    8.804567][  T166] Modules linked in:
| [    8.804994][  T166] Tainted: [W]=WARN
[    8.805095][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.805263][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.805440][  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
[    8.805902][  T166] RSP: 0018:ffa0000000867ab0 EFLAGS: 00010286
[    8.806068][  T166] RAX: 00000000ffffffa6 RBX: ff11000008a23b40 RCX: 1ff400000010cf1c
[    8.806267][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000008a23bf0
[    8.806467][  T166] RBP: ff11000009e11000 R08: 1fe220000114477f R09: ff1100000bb62e80
[    8.806666][  T166] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[    8.806860][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000009e11000
[    8.807055][  T166] FS:  00007f30f19db740(0000) GS:ff1100007b9d3000(0000) knlGS:0000000000000000
[    8.807286][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.807455][  T166] CR2: 000056453bc21310 CR3: 000000000b13a002 CR4: 0000000000771ef0
[    8.807657][  T166] PKRU: 55555554
[    8.807755][  T166] Call Trace:
[    8.807853][  T166]  <TASK>
[    8.807921][  T166]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    8.808052][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.808184][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.808315][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.808426][  T166]  register_netdevice (net/core/dev.c:11488)
[    8.808559][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.808724][  T166]  register_netdev (net/core/dev.c:11552)
[    8.808854][  T166]  loopback_net_init (drivers/net/loopback.c:218)
[    8.808984][  T166]  ops_init (net/core/net_namespace.c:137)
[    8.809084][  T166]  setup_net (net/core/net_namespace.c:446)
[    8.809187][  T166]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    8.809322][  T166]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    8.809455][  T166]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    8.809590][  T166]  copy_net_ns (net/core/net_namespace.c:579)
[    8.809719][  T166]  create_new_namespaces (kernel/nsproxy.c:132)
[    8.809852][  T166]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    8.809981][  T166]  ksys_unshare (kernel/fork.c:3243)
[    8.810119][  T166]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    8.810254][  T166]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    8.810381][  T166]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    8.810516][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.810644][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.810774][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.810902][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.811068][  T166] RIP: 0033:0x7f30f1ad6bcb
[    8.811210][  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
[    8.811671][  T166] RSP: 002b:00007ffd194badc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    8.811873][  T166] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f30f1ad6bcb
[    8.812065][  T166] RDX: 0000000000000000 RSI: 00007ffd194bab30 RDI: 0000000040000000
[    8.812277][  T166] RBP: 00007ffd194bb150 R08: 00007ffd194bad20 R09: 0000000000000000
[    8.812476][  T166] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    8.812674][  T166] R13: 0000000000000000 R14: 00000000ffffffff R15: 000056453bc24b68
| [    8.843863][  T166] ------------[ cut here ]------------
| [    8.844021][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/166
| [    8.844290][  T166] Modules linked in:
| [    8.844665][  T166] Tainted: [W]=WARN
[    8.844755][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.844907][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.845064][  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
[    8.845504][  T166] RSP: 0018:ffa0000000867b58 EFLAGS: 00010286
[    8.845655][  T166] RAX: 00000000ffffffa6 RBX: ff11000009ec8c40 RCX: 1ff400000010cf31
[    8.845831][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009ec8cf0
[    8.846006][  T166] RBP: ff1100000937c000 R08: 1fe22000013d919f R09: ff1100000bb62e58
[    8.846189][  T166] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[    8.846375][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000937c000
[    8.846560][  T166] FS:  000000000eacb400(0000) GS:ff1100007b9d3000(0000) knlGS:0000000000000000
[    8.846771][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.846922][  T166] CR2: 00007f45c8852000 CR3: 000000000c1b9003 CR4: 0000000000771ef0
[    8.847099][  T166] PKRU: 55555554
[    8.847192][  T166] Call Trace:
[    8.847280][  T166]  <TASK>
[    8.847342][  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))
[    8.847466][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.847584][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.847706][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.847796][  T166]  register_netdevice (net/core/dev.c:11488)
[    8.847916][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.848063][  T166]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    8.848188][  T166]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    8.848308][  T166]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    8.848431][  T166]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    8.848537][  T166]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    8.848654][  T166]  ? build_open_flags (fs/open.c:1212)
[    8.848773][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.848890][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    8.849010][  T166]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    8.849133][  T166]  ? fput_close_sync (fs/file_table.c:615)
[    8.849257][  T166]  ? __ia32_sys_open (fs/open.c:1374)
[    8.849376][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.849502][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.849620][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.849737][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.849859][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.850005][  T166] RIP: 0033:0x47cc8d
[    8.850101][  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 
[    8.850537][  T166] RSP: 002b:00007ffc738e0410 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.850720][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.850903][  T166] RDX: 00007ffc738e0490 RSI: 00000000400454ca RDI: 0000000000000005
[    8.851080][  T166] RBP: 00007ffc738e0460 R08: 0000000000000000 R09: 0000000000000000
[    8.851263][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc738e0968
[    8.851442][  T166] R13: 00007ffc738e09f0 R14: 0000000000000002 R15: 0000000000543540
| [    8.853027][  T166] ------------[ cut here ]------------
| [    8.853152][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/166
| [    8.853379][  T166] Modules linked in:
| [    8.853830][  T166] Tainted: [W]=WARN
[    8.853920][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.854066][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.854224][  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
[    8.854649][  T166] RSP: 0018:ffa0000000867c58 EFLAGS: 00010286
[    8.854797][  T166] RAX: 00000000ffffffa6 RBX: ff11000009ec8ac0 RCX: 1ff400000010cf51
[    8.854973][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009ec8b70
[    8.855160][  T166] RBP: ff1100000937c000 R08: 1fe22000013d916f R09: ff1100000bb62e58
[    8.855335][  T166] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[    8.855513][  T166] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
[    8.855692][  T166] FS:  000000000eacb400(0000) GS:ff1100007b9d3000(0000) knlGS:0000000000000000
[    8.855893][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.856053][  T166] CR2: 00007f45c8852000 CR3: 000000000c1b9003 CR4: 0000000000771ef0
[    8.856233][  T166] PKRU: 55555554
[    8.856319][  T166] Call Trace:
[    8.856412][  T166]  <TASK>
[    8.856473][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    8.856590][  T166]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    8.856707][  T166]  notifier_call_chain (kernel/notifier.c:85)
[    8.856824][  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)
[    8.856945][  T166]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    8.857091][  T166]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    8.857215][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.857331][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.857452][  T166]  ? update_socket_protocol+0x10/0x10
[    8.857567][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    8.857686][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.857803][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.857921][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.858036][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.858157][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.858299][  T166] RIP: 0033:0x47cc8d
[    8.858391][  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 
[    8.858808][  T166] RSP: 002b:00007ffc738e0450 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.858987][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.859163][  T166] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    8.859335][  T166] RBP: 00007ffc738e04a0 R08: 0000000000000000 R09: 0000000000000000
[    8.859511][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc738e0968
[    8.859686][  T166] R13: 00007ffc738e09f0 R14: 0000000000000002 R15: 0000000000543540
| [    8.861309][  T166] ------------[ cut here ]------------
| [    8.861445][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/166
| [    8.861687][  T166] Modules linked in:
| [    8.862064][  T166] Tainted: [W]=WARN
[    8.862162][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.862320][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.862485][  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
[    8.862927][  T166] RSP: 0018:ffa0000000867850 EFLAGS: 00010286
[    8.863082][  T166] RAX: 00000000ffffffa6 RBX: ff11000009ec8340 RCX: 1ff400000010ced0
[    8.863274][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009ec83f0
[    8.863466][  T166] RBP: ff1100000937c000 R08: 1fe22000013d907f R09: ff1100000bb62e58
[    8.863650][  T166] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
[    8.863834][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000005818900
[    8.864019][  T166] FS:  000000000eacb400(0000) GS:ff1100007b9d3000(0000) knlGS:0000000000000000
[    8.864240][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.864394][  T166] CR2: 00007f45c8852000 CR3: 000000000c1b9003 CR4: 0000000000771ef0
[    8.864582][  T166] PKRU: 55555554
[    8.864677][  T166] Call Trace:
[    8.864769][  T166]  <TASK>
[    8.864833][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.864963][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.865058][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    8.865191][  T166]  __dev_notify_flags (net/core/dev.c:9787)
[    8.865315][  T166]  ? netif_change_name (net/core/dev.c:1495)
[    8.865444][  T166]  ? __dev_change_flags (net/core/dev.c:9752)
[    8.865571][  T166]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    8.865694][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    8.865820][  T166]  netif_change_flags (net/core/dev.c:9820)
[    8.865946][  T166]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    8.866075][  T166]  dev_change_flags (net/core/dev_api.c:68)
[    8.866206][  T166]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    8.866332][  T166]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    8.866461][  T166]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    8.866591][  T166]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    8.866690][  T166]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    8.866816][  T166]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    8.866944][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.867069][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.867196][  T166]  sock_do_ioctl (net/socket.c:1313)
[    8.867323][  T166]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    8.867456][  T166]  ? ioctl_file_clone (fs/ioctl.c:244)
[    8.867584][  T166]  sock_ioctl (net/socket.c:1434)
[    8.867680][  T166]  ? br_ioctl_call (net/socket.c:1279)
[    8.867806][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.867933][  T166]  ? update_socket_protocol+0x10/0x10
[    8.868056][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    8.868186][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.868311][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.868442][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.868566][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.868698][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.868853][  T166] RIP: 0033:0x47cc8d
[    8.868955][  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 
[    8.869500][  T166] RSP: 002b:00007ffc738e0430 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.869772][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.869956][  T166] RDX: 00007ffc738e04a0 RSI: 0000000000008914 RDI: 0000000000000006
[    8.870145][  T166] RBP: 00007ffc738e0480 R08: 0000000000000000 R09: 0000000000000000
[    8.870419][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc738e0968
[    8.870604][  T166] R13: 00007ffc738e09f0 R14: 0000000000000002 R15: 0000000000543540
| [   98.656028][  T166] ------------[ cut here ]------------
| [   98.656219][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/166
| [   98.656508][  T166] Modules linked in:
| [   98.656926][  T166] Tainted: [W]=WARN
[   98.657027][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.657193][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.657371][  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
[   98.658624][  T166] RSP: 0018:ffa00000008676f0 EFLAGS: 00010286
[   98.658794][  T166] RAX: 00000000ffffffa6 RBX: ff11000001ef67c0 RCX: 1ff400000010cea4
[   98.658992][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000001ef6870
[   98.659188][  T166] RBP: ff1100000937c000 R08: 1fe22000003ded0f R09: ff1100000bb62e58
[   98.659385][  T166] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000041
[   98.660164][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ffa0000000867790
[   98.660365][  T166] FS:  0000000000000000(0000) GS:ff1100007b9d3000(0000) knlGS:0000000000000000
[   98.661118][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.661286][  T166] CR2: 00007f45c8852000 CR3: 0000000029339001 CR4: 0000000000771ef0
[   98.662199][  T166] PKRU: 55555554
[   98.662303][  T166] Call Trace:
[   98.662405][  T166]  <TASK>
[   98.662600][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   98.662734][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   98.662836][  T166]  netif_close_many (net/core/dev.c:1804)
[   98.662969][  T166]  ? asym_cpu_capacity_scan (./include/linux/rculist.h:103)
[   98.663103][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.663237][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.663369][  T166]  ? __dev_close_many (net/core/dev.c:1781)
[   98.663512][  T166]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   98.663678][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   98.663843][  T166]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   98.663976][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.664141][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.664273][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.664413][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.664547][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.664687][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.664821][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.664954][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.665089][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.665228][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.665358][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.665509][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.665642][  T166]  __fput (fs/file_table.c:510)
[   98.665746][  T166]  task_work_run (kernel/task_work.c:233)
[   98.665879][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.666011][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.666144][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.666279][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.666380][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.666519][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.666649][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.666780][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.666913][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.667045][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.667209][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.667359][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.667503][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.667634][  T166]  get_signal (kernel/signal.c:3037)
[   98.667769][  T166]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.667901][  T166]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.668030][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[   98.668165][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.668300][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.668442][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.668578][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.668712][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.668881][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.669013][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.669145][  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)
[   98.669278][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.669420][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.669585][  T166] RIP: 0033:0x4c2d9e
[   98.669790][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.669975][  T166] RSP: 002b:00007ffc738dfdc0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.670177][  T166] RAX: 0000000000000014 RBX: 0000000000000012 RCX: 00000000004c2d9e
[   98.670377][  T166] RDX: 0000000000000014 RSI: 00007ffc738dfea0 RDI: 0000000000000007
[   98.670672][  T166] RBP: 00007ffc738dfdd0 R08: 00007ffc738dfe60 R09: 000000000000000c
[   98.670871][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc738e0968
[   98.671067][  T166] R13: 00007ffc738e09f0 R14: 00007ffc738dff90 R15: 0000000000543540
| [   98.675466][  T166] ------------[ cut here ]------------
| [   98.675603][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/166
| [   98.675857][  T166] Modules linked in:
| [   98.676246][  T166] Tainted: [W]=WARN
[   98.676343][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.678484][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.678671][  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
[   98.679398][  T166] RSP: 0018:ffa0000000867820 EFLAGS: 00010286
[   98.680278][  T166] RAX: 00000000ffffffa6 RBX: ff11000001ef76c0 RCX: 1ff400000010ceca
[   98.681184][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000001ef7770
[   98.681373][  T166] RBP: ff1100000937c000 R08: 1fe22000003deeef R09: ff1100000bb62e58
[   98.682147][  T166] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   98.682334][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.682530][  T166] FS:  0000000000000000(0000) GS:ff1100007b9d3000(0000) knlGS:0000000000000000
[   98.682752][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.682913][  T166] CR2: 00007f45c8852000 CR3: 0000000029339001 CR4: 0000000000771ef0
[   98.683103][  T166] PKRU: 55555554
[   98.683198][  T166] Call Trace:
[   98.683291][  T166]  <TASK>
[   98.683357][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.683528][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.683683][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.683811][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.683937][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.684065][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.684194][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.684320][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.684454][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.684582][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.684708][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.684836][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.684966][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.685092][  T166]  __fput (fs/file_table.c:510)
[   98.685191][  T166]  task_work_run (kernel/task_work.c:233)
[   98.685317][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.685454][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.685583][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.685712][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.685807][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.685934][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.686062][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.686187][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.686314][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.686456][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.686614][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.686740][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.686866][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.686992][  T166]  get_signal (kernel/signal.c:3037)
[   98.687122][  T166]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.687249][  T166]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.687374][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[   98.687510][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.687641][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.687770][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.687898][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.688024][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.688182][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.688310][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.688449][  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)
[   98.688659][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.688789][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.688949][  T166] RIP: 0033:0x4c2d9e
[   98.689051][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.689305][  T166] RSP: 002b:00007ffc738dfdc0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.689507][  T166] RAX: 0000000000000014 RBX: 0000000000000012 RCX: 00000000004c2d9e
[   98.689693][  T166] RDX: 0000000000000014 RSI: 00007ffc738dfea0 RDI: 0000000000000007
[   98.689968][  T166] RBP: 00007ffc738dfdd0 R08: 00007ffc738dfe60 R09: 000000000000000c
[   98.690160][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc738e0968
[   98.690349][  T166] R13: 00007ffc738e09f0 R14: 00007ffc738dff90 R15: 0000000000543540
| [   98.711826][   T12] ------------[ cut here ]------------
| [   98.711989][   T12] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#1: 0/12
| [   98.712258][   T12] Modules linked in:
| [   98.713111][   T12] Tainted: [W]=WARN
[   98.713203][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.713451][   T12] Workqueue: netns cleanup_net
[   98.713587][   T12] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.713743][   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
[   98.714171][   T12] RSP: 0018:ffa00000000c7878 EFLAGS: 00010286
[   98.714323][   T12] RAX: 00000000ffffffa6 RBX: ff11000004bdfcc0 RCX: 1ff4000000018ed5
[   98.714577][   T12] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004bdfd70
[   98.714755][   T12] RBP: ff11000009e11000 R08: 1fe220000097bfaf R09: ff11000001afd1d0
[   98.714931][   T12] R10: 0000000000000001 R11: 0000000000000001 R12: 00000000ffffffff
[   98.715107][   T12] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.715300][   T12] FS:  0000000000000000(0000) GS:ff1100007ba53000(0000) knlGS:0000000000000000
[   98.715560][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.715714][   T12] CR2: 00007f4511e77f98 CR3: 0000000029339001 CR4: 0000000000771ef0
[   98.715890][   T12] PKRU: 55555554
[   98.715979][   T12] Call Trace:
[   98.716073][   T12]  <TASK>
[   98.716137][   T12]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.716287][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.716506][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   98.716650][   T12]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   98.716772][   T12]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   98.716890][   T12]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   98.717011][   T12]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   98.717129][   T12]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   98.717247][   T12]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   98.717367][   T12]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   98.717541][   T12]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   98.717658][   T12]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.717780][   T12]  cleanup_net (net/core/net_namespace.c:702)
[   98.717901][   T12]  ? net_passive_dec (./include/linux/llist.h:241)
[   98.718021][   T12]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   98.718141][   T12]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   98.718262][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.718382][   T12]  process_one_work (kernel/workqueue.c:3314)
[   98.718555][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   98.718674][   T12]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.718798][   T12]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   98.718922][   T12]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.719045][   T12]  kthread (kernel/kthread.c:436)
[   98.719136][   T12]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.719289][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[   98.719462][   T12]  ret_from_fork (arch/x86/kernel/process.c:158)
[   98.719583][   T12]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   98.719730][   T12]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   98.719852][   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