======================================
| xx__-> [    8.778566][  T167] ------------[ cut here ]------------
| [    8.778814][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: unshare/167
| [    8.779097][  T167] Modules linked in:
| [    8.779532][  T167] Tainted: [W]=WARN
[    8.779637][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.779806][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.779991][  T167] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    8.780481][  T167] RSP: 0018:ffa0000000807ab0 EFLAGS: 00010286
[    8.780654][  T167] RAX: 00000000ffffffa6 RBX: ff1100000ae4d240 RCX: 1ff4000000100f1c
[    8.780858][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000ae4d2f0
[    8.781066][  T167] RBP: ff110000025bc000 R08: 1fe22000015c9a5f R09: ff11000004dd8b80
[    8.781270][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[    8.781477][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff110000025bc000
[    8.781684][  T167] FS:  00007f4982899740(0000) GS:ff110000a5bd3000(0000) knlGS:0000000000000000
[    8.781924][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.782100][  T167] CR2: 000055dcc0820310 CR3: 0000000004bbc003 CR4: 0000000000771ef0
[    8.782310][  T167] PKRU: 55555554
[    8.782413][  T167] Call Trace:
[    8.782515][  T167]  <TASK>
[    8.782586][  T167]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    8.782725][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.782861][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.783004][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.783112][  T167]  register_netdevice (net/core/dev.c:11488)
[    8.783249][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.783426][  T167]  register_netdev (net/core/dev.c:11552)
[    8.783560][  T167]  loopback_net_init (drivers/net/loopback.c:218)
[    8.783699][  T167]  ops_init (net/core/net_namespace.c:137)
[    8.783808][  T167]  setup_net (net/core/net_namespace.c:446)
[    8.783913][  T167]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    8.784055][  T167]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    8.784193][  T167]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    8.784337][  T167]  copy_net_ns (net/core/net_namespace.c:579)
[    8.784476][  T167]  create_new_namespaces (kernel/nsproxy.c:132)
[    8.784614][  T167]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    8.784750][  T167]  ksys_unshare (kernel/fork.c:3243)
[    8.784888][  T167]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    8.785032][  T167]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    8.785167][  T167]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    8.785308][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.785442][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.785579][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.785712][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.785878][  T167] RIP: 0033:0x7f4982994bcb
[    8.786025][  T167] Code: 73 01 c3 48 8b 0d 2d 82 0f 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d fd 81 0f 00 f7 d8 64 89 01 48
All code
========
   0:	73 01                	jae    0x3
   2:	c3                   	ret
   3:	48 8b 0d 2d 82 0f 00 	mov    0xf822d(%rip),%rcx        # 0xf8237
   a:	f7 d8                	neg    %eax
   c:	64 89 01             	mov    %eax,%fs:(%rcx)
   f:	48 83 c8 ff          	or     $0xffffffffffffffff,%rax
  13:	c3                   	ret
  14:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  1b:	00 00 00 
  1e:	90                   	nop
  1f:	f3 0f 1e fa          	endbr64
  23:	b8 10 01 00 00       	mov    $0x110,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax		<-- trapping instruction
  30:	73 01                	jae    0x33
  32:	c3                   	ret
  33:	48 8b 0d fd 81 0f 00 	mov    0xf81fd(%rip),%rcx        # 0xf8237
  3a:	f7 d8                	neg    %eax
  3c:	64 89 01             	mov    %eax,%fs:(%rcx)
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax
   6:	73 01                	jae    0x9
   8:	c3                   	ret
   9:	48 8b 0d fd 81 0f 00 	mov    0xf81fd(%rip),%rcx        # 0xf820d
  10:	f7 d8                	neg    %eax
  12:	64 89 01             	mov    %eax,%fs:(%rcx)
  15:	48                   	rex.W
[    8.786505][  T167] RSP: 002b:00007fffa6a16788 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    8.786710][  T167] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4982994bcb
[    8.786912][  T167] RDX: 0000000000000000 RSI: 00007fffa6a164f0 RDI: 0000000040000000
[    8.787126][  T167] RBP: 00007fffa6a16b10 R08: 00007fffa6a166e0 R09: 0000000000000000
[    8.787334][  T167] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    8.787533][  T167] R13: 0000000000000000 R14: 00000000ffffffff R15: 000055dcc0823b68
| [    8.805990][  T167] ------------[ cut here ]------------
| [    8.806151][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [    8.806412][  T167] Modules linked in:
| [    8.806795][  T167] Tainted: [W]=WARN
[    8.806889][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.807051][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.807213][  T167] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    8.807659][  T167] RSP: 0018:ffa0000000807b58 EFLAGS: 00010286
[    8.807816][  T167] RAX: 00000000ffffffa6 RBX: ff11000004e999c0 RCX: 1ff4000000100f31
[    8.808005][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004e99a70
[    8.808190][  T167] RBP: ff1100000aeec000 R08: 1fe22000009d334f R09: ff11000004dd8b58
[    8.808381][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[    8.808567][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000aeec000
[    8.808755][  T167] FS:  00000000334ec400(0000) GS:ff110000a5bd3000(0000) knlGS:0000000000000000
[    8.808975][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.809130][  T167] CR2: 00007ff3c4204000 CR3: 0000000004bb6004 CR4: 0000000000771ef0
[    8.809323][  T167] PKRU: 55555554
[    8.809417][  T167] Call Trace:
[    8.809511][  T167]  <TASK>
[    8.809575][  T167]  ? ip6_route_dev_notify (./include/net/net_namespace.h:419 (discriminator 1) ./include/linux/netdevice.h:2776 (discriminator 1) net/ipv6/route.c:6476 (discriminator 1))
[    8.809700][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.809823][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.809947][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.810049][  T167]  register_netdevice (net/core/dev.c:11488)
[    8.810176][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.810335][  T167]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    8.810464][  T167]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    8.810590][  T167]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    8.810715][  T167]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    8.810811][  T167]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    8.810934][  T167]  ? build_open_flags (fs/open.c:1212)
[    8.811064][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.811190][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    8.811616][  T167]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    8.811742][  T167]  ? fput_close_sync (fs/file_table.c:615)
[    8.811867][  T167]  ? __ia32_sys_open (fs/open.c:1374)
[    8.811996][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.812123][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.812247][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.812383][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.812508][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.812662][  T167] RIP: 0033:0x47cc8d
[    8.812763][  T167] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[    8.813207][  T167] RSP: 002b:00007fffe70ba470 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.813400][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.813585][  T167] RDX: 00007fffe70ba4f0 RSI: 00000000400454ca RDI: 0000000000000005
[    8.813769][  T167] RBP: 00007fffe70ba4c0 R08: 0000000000000000 R09: 0000000000000000
[    8.813954][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffe70ba9c8
[    8.814146][  T167] R13: 00007fffe70baa50 R14: 0000000000000002 R15: 0000000000543540
| [    8.815821][  T167] ------------[ cut here ]------------
| [    8.815947][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [    8.816195][  T167] Modules linked in:
| [    8.816576][  T167] Tainted: [W]=WARN
[    8.816670][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.816825][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.816991][  T167] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    8.817431][  T167] RSP: 0018:ffa0000000807c58 EFLAGS: 00010286
[    8.817586][  T167] RAX: 00000000ffffffa6 RBX: ff11000004e99840 RCX: 1ff4000000100f51
[    8.817774][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004e998f0
[    8.817957][  T167] RBP: ff1100000aeec000 R08: 1fe22000009d331f R09: ff11000004dd8b58
[    8.818145][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[    8.818333][  T167] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
[    8.818520][  T167] FS:  00000000334ec400(0000) GS:ff110000a5bd3000(0000) knlGS:0000000000000000
[    8.818738][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.818893][  T167] CR2: 00007ff3c4204000 CR3: 0000000004bb6004 CR4: 0000000000771ef0
[    8.819082][  T167] PKRU: 55555554
[    8.819173][  T167] Call Trace:
[    8.819264][  T167]  <TASK>
[    8.819336][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    8.819461][  T167]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    8.819585][  T167]  notifier_call_chain (kernel/notifier.c:85)
[    8.819710][  T167]  netdev_update_features (net/core/dev.c:2287 net/core/dev.c:2301 net/core/dev.c:1590 net/core/dev.c:11099 net/core/dev.c:11096)
[    8.819834][  T167]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    8.819998][  T167]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    8.820124][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.820251][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.820385][  T167]  ? update_socket_protocol+0x10/0x10
[    8.820509][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[    8.820636][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.820761][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.820885][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.821017][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.821141][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.821301][  T167] RIP: 0033:0x47cc8d
[    8.821400][  T167] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[    8.821837][  T167] RSP: 002b:00007fffe70ba4b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.822029][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.822213][  T167] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    8.822403][  T167] RBP: 00007fffe70ba500 R08: 0000000000000005 R09: 00000000000003a0
[    8.822588][  T167] R10: 0000000000000001 R11: 0000000000000246 R12: 00007fffe70ba9c8
[    8.822771][  T167] R13: 00007fffe70baa50 R14: 0000000000000002 R15: 0000000000543540
| [    8.824515][  T167] ------------[ cut here ]------------
| [    8.824648][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [    8.824906][  T167] Modules linked in:
| [    8.825566][  T167] Tainted: [W]=WARN
[    8.825668][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.825832][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.826006][  T167] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    8.826482][  T167] RSP: 0018:ffa0000000807850 EFLAGS: 00010286
[    8.826648][  T167] RAX: 00000000ffffffa6 RBX: ff11000004e99240 RCX: 1ff4000000100ed0
[    8.826844][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004e992f0
[    8.827049][  T167] RBP: ff1100000aeec000 R08: 1fe22000009d325f R09: ff11000004dd8b58
[    8.827246][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
[    8.827450][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff110000057d8900
[    8.827649][  T167] FS:  00000000334ec400(0000) GS:ff110000a5bd3000(0000) knlGS:0000000000000000
[    8.827881][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.828051][  T167] CR2: 00007ff3c4204000 CR3: 0000000004bb6004 CR4: 0000000000771ef0
[    8.828250][  T167] PKRU: 55555554
[    8.828356][  T167] Call Trace:
[    8.828454][  T167]  <TASK>
[    8.828523][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.828657][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.828759][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    8.828890][  T167]  __dev_notify_flags (net/core/dev.c:9787)
[    8.829025][  T167]  ? netif_change_name (net/core/dev.c:1495)
[    8.829157][  T167]  ? __dev_change_flags (net/core/dev.c:9752)
[    8.829297][  T167]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    8.829429][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    8.829563][  T167]  netif_change_flags (net/core/dev.c:9820)
[    8.829695][  T167]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    8.829830][  T167]  dev_change_flags (net/core/dev_api.c:68)
[    8.829967][  T167]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    8.830103][  T167]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    8.830234][  T167]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    8.830372][  T167]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    8.830490][  T167]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    8.830622][  T167]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    8.830762][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.830897][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.831038][  T167]  sock_do_ioctl (net/socket.c:1313)
[    8.831171][  T167]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    8.831310][  T167]  ? ioctl_file_clone (fs/ioctl.c:244)
[    8.831445][  T167]  sock_ioctl (net/socket.c:1434)
[    8.831547][  T167]  ? br_ioctl_call (net/socket.c:1279)
[    8.831682][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.831817][  T167]  ? update_socket_protocol+0x10/0x10
[    8.831949][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[    8.832086][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.832219][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.832358][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.832489][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.832620][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.832785][  T167] RIP: 0033:0x47cc8d
[    8.832889][  T167] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[    8.833366][  T167] RSP: 002b:00007fffe70ba490 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.833564][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.833762][  T167] RDX: 00007fffe70ba500 RSI: 0000000000008914 RDI: 0000000000000006
[    8.833962][  T167] RBP: 00007fffe70ba4e0 R08: 0000000000000005 R09: 00000000000003a0
[    8.834159][  T167] R10: 0000000000000001 R11: 0000000000000246 R12: 00007fffe70ba9c8
[    8.834363][  T167] R13: 00007fffe70baa50 R14: 0000000000000002 R15: 0000000000543540
| [   98.623020][  T167] ------------[ cut here ]------------
| [   98.623226][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [   98.623574][  T167] Modules linked in:
| [   98.624043][  T167] Tainted: [W]=WARN
[   98.624171][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.624404][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.624582][  T167] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   98.625127][  T167] RSP: 0018:ffa00000008076f0 EFLAGS: 00010286
[   98.625361][  T167] RAX: 00000000ffffffa6 RBX: ff1100000b87d0c0 RCX: 1ff4000000100ea4
[   98.625562][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000b87d170
[   98.625873][  T167] RBP: ff1100000aeec000 R08: 1fe220000170fa2f R09: ff11000004dd8b58
[   98.626078][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000041
[   98.626283][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ffa0000000807790
[   98.626574][  T167] FS:  0000000000000000(0000) GS:ff110000a5bd3000(0000) knlGS:0000000000000000
[   98.626812][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.626989][  T167] CR2: 00007f9e024dd6f0 CR3: 0000000033139001 CR4: 0000000000771ef0
[   98.627199][  T167] PKRU: 55555554
[   98.627376][  T167] Call Trace:
[   98.627482][  T167]  <TASK>
[   98.627555][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   98.627696][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   98.627801][  T167]  netif_close_many (net/core/dev.c:1804)
[   98.627943][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.628081][  T167]  ? __dev_close_many (net/core/dev.c:1781)
[   98.628214][  T167]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   98.628724][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   98.628888][  T167]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   98.629022][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.629189][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.629425][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.629558][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.629690][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.629829][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.630090][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.630225][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.630606][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.630777][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.630922][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.631058][  T167]  __fput (fs/file_table.c:510)
[   98.631163][  T167]  task_work_run (kernel/task_work.c:233)
[   98.631499][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.631635][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[   98.631768][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.631908][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.632017][  T167]  ? exit_notify (kernel/exit.c:748)
[   98.632151][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.632390][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.632522][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.632743][  T167]  do_group_exit (kernel/exit.c:1119)
[   98.632899][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.633159][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.633368][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.633507][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.633664][  T167]  get_signal (kernel/signal.c:3037)
[   98.633801][  T167]  ? __raw_spin_lock_init (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/spinlock_debug.c:25)
[   98.634023][  T167]  ? mark_usage (kernel/locking/lockdep.c:4674)
[   98.634161][  T167]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   98.634516][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.634658][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.634795][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.635024][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.635164][  T167]  ? fd_install (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:960 (discriminator 2) fs/file.c:699 (discriminator 2))
[   98.635384][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.635524][  T167]  ? update_socket_protocol+0x10/0x10
[   98.635664][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[   98.635800][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.636028][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.636199][  T167]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.636411][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.636548][  T167]  do_syscall_64 (./include/linux/irq-entry-common.h:207 ./include/linux/irq-entry-common.h:230 ./include/linux/entry-common.h:318 arch/x86/entry/syscall_64.c:100)
[   98.636686][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.636823][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.637082][  T167] RIP: 0033:0x47ea2b
[   98.637195][  T167] Code: Unable to access opcode bytes at 0x47ea01.

Code starting with the faulting instruction
===========================================
[   98.637492][  T167] RSP: 002b:00007fffe70b9f18 EFLAGS: 00000202 ORIG_RAX: 0000000000000029
[   98.637703][  T167] RAX: 0000000000000007 RBX: 00007fffe70b9ff0 RCX: 000000000047ea2b
[   98.637909][  T167] RDX: 0000000000000000 RSI: 0000000000080003 RDI: 0000000000000010
[   98.638114][  T167] RBP: 00007fffe70b9f50 R08: 0000000000000041 R09: 00000000334ed3e0
[   98.638405][  T167] R10: 0000000000000040 R11: 0000000000000202 R12: 00007fffe70ba9c8
[   98.638613][  T167] R13: 00007fffe70baa50 R14: 00007fffe70ba4c8 R15: 0000000000543540
| [   98.657681][  T167] ------------[ cut here ]------------
| [   98.657848][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [   98.658111][  T167] Modules linked in:
| [   98.658692][  T167] Tainted: [W]=WARN
[   98.658796][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.658978][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.659148][  T167] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   98.659637][  T167] RSP: 0018:ffa0000000807820 EFLAGS: 00010286
[   98.659800][  T167] RAX: 00000000ffffffa6 RBX: ff11000005e33cc0 RCX: 1ff4000000100eca
[   98.660012][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000005e33d70
[   98.660212][  T167] RBP: ff1100000aeec000 R08: 1fe2200000bc67af R09: ff11000004dd8b58
[   98.660437][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   98.660629][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.660821][  T167] FS:  0000000000000000(0000) GS:ff110000a5bd3000(0000) knlGS:0000000000000000
[   98.661045][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.661208][  T167] CR2: 00007f9e024dd6f0 CR3: 0000000033139001 CR4: 0000000000771ef0
[   98.661434][  T167] PKRU: 55555554
[   98.661534][  T167] Call Trace:
[   98.661632][  T167]  <TASK>
[   98.661721][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.661893][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.662050][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.662176][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.662316][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.662444][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.662597][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.662736][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.662873][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.663000][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.663128][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.663264][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.663401][  T167]  __fput (fs/file_table.c:510)
[   98.663524][  T167]  task_work_run (kernel/task_work.c:233)
[   98.663654][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.663800][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[   98.663956][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.664090][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.664189][  T167]  ? exit_notify (kernel/exit.c:748)
[   98.664329][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.664470][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.664633][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.664760][  T167]  do_group_exit (kernel/exit.c:1119)
[   98.664906][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.665069][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.665198][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.665335][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.665466][  T167]  get_signal (kernel/signal.c:3037)
[   98.665596][  T167]  ? __raw_spin_lock_init (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/spinlock_debug.c:25)
[   98.665822][  T167]  ? mark_usage (kernel/locking/lockdep.c:4674)
[   98.665997][  T167]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   98.666143][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.666281][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.666421][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.666550][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.666679][  T167]  ? fd_install (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:960 (discriminator 2) fs/file.c:699 (discriminator 2))
[   98.666808][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.666944][  T167]  ? update_socket_protocol+0x10/0x10
[   98.667077][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[   98.667204][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.667346][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.667505][  T167]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.667636][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.667764][  T167]  do_syscall_64 (./include/linux/irq-entry-common.h:207 ./include/linux/irq-entry-common.h:230 ./include/linux/entry-common.h:318 arch/x86/entry/syscall_64.c:100)
[   98.667896][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.668029][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.668189][  T167] RIP: 0033:0x47ea2b
[   98.668305][  T167] Code: Unable to access opcode bytes at 0x47ea01.

Code starting with the faulting instruction
===========================================
[   98.668475][  T167] RSP: 002b:00007fffe70b9f18 EFLAGS: 00000202 ORIG_RAX: 0000000000000029
[   98.668670][  T167] RAX: 0000000000000007 RBX: 00007fffe70b9ff0 RCX: 000000000047ea2b
[   98.668865][  T167] RDX: 0000000000000000 RSI: 0000000000080003 RDI: 0000000000000010
[   98.669084][  T167] RBP: 00007fffe70b9f50 R08: 0000000000000041 R09: 00000000334ed3e0
[   98.669297][  T167] R10: 0000000000000040 R11: 0000000000000202 R12: 00007fffe70ba9c8
[   98.669517][  T167] R13: 00007fffe70baa50 R14: 00007fffe70ba4c8 R15: 0000000000543540
| [   98.688468][   T11] ------------[ cut here ]------------
| [   98.688699][   T11] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: 0/11
| [   98.688971][   T11] Modules linked in:
| [   98.689439][   T11] Tainted: [W]=WARN
[   98.689531][   T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.689681][   T11] Workqueue: netns cleanup_net
[   98.689814][   T11] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.689973][   T11] 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
[   98.690453][   T11] RSP: 0018:ffa00000000b7878 EFLAGS: 00010286
[   98.690606][   T11] RAX: 00000000ffffffa6 RBX: ff11000005e333c0 RCX: 1ff4000000016ed5
[   98.690791][   T11] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000005e33470
[   98.690987][   T11] RBP: ff110000025bc000 R08: 1fe2200000bc668f R09: ff11000001afaed0
[   98.691196][   T11] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[   98.691388][   T11] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.691575][   T11] FS:  0000000000000000(0000) GS:ff110000a5d53000(0000) knlGS:0000000000000000
[   98.691798][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.691955][   T11] CR2: 00007f3c1a7dbf98 CR3: 0000000033139006 CR4: 0000000000771ef0
[   98.692140][   T11] PKRU: 55555554
[   98.692232][   T11] Call Trace:
[   98.692335][   T11]  <TASK>
[   98.692401][   T11]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.692566][   T11]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.692722][   T11]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   98.692848][   T11]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   98.692972][   T11]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   98.693094][   T11]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   98.693218][   T11]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   98.693351][   T11]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   98.693475][   T11]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   98.693602][   T11]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   98.693727][   T11]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   98.693849][   T11]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.693976][   T11]  cleanup_net (net/core/net_namespace.c:702)
[   98.694101][   T11]  ? net_passive_dec (./include/linux/llist.h:241)
[   98.694226][   T11]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   98.694387][   T11]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   98.694510][   T11]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.694637][   T11]  process_one_work (kernel/workqueue.c:3314)
[   98.694765][   T11]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   98.694888][   T11]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.695017][   T11]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   98.695146][   T11]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.695279][   T11]  kthread (kernel/kthread.c:436)
[   98.695378][   T11]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.695532][   T11]  ? kthread_affine_node (kernel/kthread.c:378)
[   98.695656][   T11]  ret_from_fork (arch/x86/kernel/process.c:158)
[   98.695783][   T11]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   98.695937][   T11]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   98.696061][   T11]  ? 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