======================================
| xx__-> [    9.791152][  T167] ------------[ cut here ]------------
| [    9.791372][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: unshare/167
| [    9.791825][  T167] Modules linked in:
| [    9.792475][  T167] Tainted: [W]=WARN
[    9.792582][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.792780][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.793010][  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
[    9.793636][  T167] RSP: 0018:ffa0000000847ab0 EFLAGS: 00010286
[    9.793983][  T167] RAX: 00000000ffffffa6 RBX: ff110000092081c0 RCX: 1ff4000000108f1c
[    9.794195][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009208270
[    9.794421][  T167] RBP: ff11000007ea9000 R08: 1fe220000124104f R09: ff1100000c1bd180
[    9.794730][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[    9.795036][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000007ea9000
[    9.795281][  T167] FS:  00007fe482d56740(0000) GS:ff110000a37d3000(0000) knlGS:0000000000000000
[    9.795809][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.796066][  T167] CR2: 0000562e9cb90310 CR3: 0000000005541002 CR4: 0000000000771ef0
[    9.796399][  T167] PKRU: 55555554
[    9.796508][  T167] Call Trace:
[    9.796615][  T167]  <TASK>
[    9.796690][  T167]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    9.796834][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.797072][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[    9.797216][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.797325][  T167]  register_netdevice (net/core/dev.c:11488)
[    9.797486][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    9.797762][  T167]  register_netdev (net/core/dev.c:11552)
[    9.797903][  T167]  loopback_net_init (drivers/net/loopback.c:218)
[    9.798046][  T167]  ops_init (net/core/net_namespace.c:137)
[    9.798157][  T167]  setup_net (net/core/net_namespace.c:446)
[    9.798266][  T167]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    9.798514][  T167]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    9.798662][  T167]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    9.798805][  T167]  copy_net_ns (net/core/net_namespace.c:579)
[    9.798947][  T167]  create_new_namespaces (kernel/nsproxy.c:132)
[    9.799186][  T167]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    9.799330][  T167]  ksys_unshare (kernel/fork.c:3243)
[    9.799491][  T167]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    9.799637][  T167]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    9.799876][  T167]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    9.800021][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.800180][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.800398][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.800607][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.800860][  T167] RIP: 0033:0x7fe482e51bcb
[    9.801081][  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
[    9.801743][  T167] RSP: 002b:00007ffe6229d008 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    9.802057][  T167] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe482e51bcb
[    9.802269][  T167] RDX: 0000000000000000 RSI: 00007ffe6229cd70 RDI: 0000000040000000
[    9.802496][  T167] RBP: 00007ffe6229d390 R08: 00007ffe6229cf60 R09: 0000000000000000
[    9.802806][  T167] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    9.803016][  T167] R13: 0000000000000000 R14: 00000000ffffffff R15: 0000562e9cb93b68
| [    9.840301][  T167] ------------[ cut here ]------------
| [    9.840531][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/167
| [    9.840842][  T167] Modules linked in:
| [    9.841333][  T167] Tainted: [W]=WARN
[    9.841509][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.841720][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.841940][  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
[    9.842469][  T167] RSP: 0018:ffa0000000847b58 EFLAGS: 00010286
[    9.842681][  T167] RAX: 00000000ffffffa6 RBX: ff110000059e33c0 RCX: 1ff4000000108f31
[    9.842920][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000059e3470
[    9.843157][  T167] RBP: ff11000009bc0000 R08: 1fe2200000b3c68f R09: ff1100000c1bd158
[    9.843422][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[    9.843668][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000009bc0000
[    9.843911][  T167] FS:  00000000134bd400(0000) GS:ff110000a38d3000(0000) knlGS:0000000000000000
[    9.844190][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.844424][  T167] CR2: 00007fa01b55a000 CR3: 000000000c660004 CR4: 0000000000771ef0
[    9.844668][  T167] PKRU: 55555554
[    9.844814][  T167] Call Trace:
[    9.844959][  T167]  <TASK>
[    9.845075][  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))
[    9.845259][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.845466][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[    9.845647][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.845797][  T167]  register_netdevice (net/core/dev.c:11488)
[    9.845978][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    9.846186][  T167]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    9.846366][  T167]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    9.846572][  T167]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    9.846748][  T167]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    9.846894][  T167]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    9.847074][  T167]  ? build_open_flags (fs/open.c:1212)
[    9.847254][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    9.847452][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    9.847633][  T167]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    9.847813][  T167]  ? fput_close_sync (fs/file_table.c:615)
[    9.847991][  T167]  ? __ia32_sys_open (fs/open.c:1374)
[    9.848168][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.848347][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.848542][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.848719][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.848896][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.849108][  T167] RIP: 0033:0x47cc8d
[    9.849267][  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 
[    9.849804][  T167] RSP: 002b:00007ffde5f67740 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.850050][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.850292][  T167] RDX: 00007ffde5f677c0 RSI: 00000000400454ca RDI: 0000000000000005
[    9.850552][  T167] RBP: 00007ffde5f67790 R08: 0000000000000000 R09: 0000000000000000
[    9.850789][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffde5f67c98
[    9.851028][  T167] R13: 00007ffde5f67d20 R14: 0000000000000002 R15: 0000000000543540
| [    9.853264][  T167] ------------[ cut here ]------------
| [    9.853491][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/167
| [    9.853906][  T167] Modules linked in:
| [    9.854808][  T167] Tainted: [W]=WARN
[    9.854950][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.855153][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.855365][  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
[    9.855882][  T167] RSP: 0018:ffa0000000847c58 EFLAGS: 00010286
[    9.856088][  T167] RAX: 00000000ffffffa6 RBX: ff110000059e21c0 RCX: 1ff4000000108f51
[    9.856348][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000059e2270
[    9.856609][  T167] RBP: ff11000009bc0000 R08: 1fe2200000b3c44f R09: ff1100000c1bd158
[    9.856846][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000000
[    9.857081][  T167] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000002
[    9.857318][  T167] FS:  00000000134bd400(0000) GS:ff110000a38d3000(0000) knlGS:0000000000000000
[    9.857616][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.857822][  T167] CR2: 00007fa01b55a000 CR3: 000000000c660004 CR4: 0000000000771ef0
[    9.858060][  T167] PKRU: 55555554
[    9.858202][  T167] Call Trace:
[    9.858342][  T167]  <TASK>
[    9.858476][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    9.858653][  T167]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    9.858832][  T167]  notifier_call_chain (kernel/notifier.c:85)
[    9.859013][  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)
[    9.859189][  T167]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    9.859413][  T167]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    9.859592][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    9.859767][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    9.859944][  T167]  ? update_socket_protocol+0x10/0x10
[    9.860119][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[    9.860297][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.860499][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.860676][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.860850][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.861025][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.861229][  T167] RIP: 0033:0x47cc8d
[    9.861399][  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 
[    9.861901][  T167] RSP: 002b:00007ffde5f67780 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.862140][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.862508][  T167] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    9.862748][  T167] RBP: 00007ffde5f677d0 R08: 0000000000000000 R09: 0000000000000000
[    9.862983][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffde5f67c98
[    9.863216][  T167] R13: 00007ffde5f67d20 R14: 0000000000000002 R15: 0000000000543540
| [    9.865500][  T167] ------------[ cut here ]------------
| [    9.865678][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/167
| [    9.865992][  T167] Modules linked in:
| [    9.866524][  T167] Tainted: [W]=WARN
[    9.866674][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.866892][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.867118][  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
[    9.867670][  T167] RSP: 0018:ffa0000000847850 EFLAGS: 00010286
[    9.867891][  T167] RAX: 00000000ffffffa6 RBX: ff110000059e24c0 RCX: 1ff4000000108ed0
[    9.868140][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000059e2570
[    9.868406][  T167] RBP: ff11000009bc0000 R08: 1fe2200000b3c4af R09: ff1100000c1bd158
[    9.868659][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000001
[    9.868910][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff110000057a8900
[    9.869161][  T167] FS:  00000000134bd400(0000) GS:ff110000a38d3000(0000) knlGS:0000000000000000
[    9.869469][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.869796][  T167] CR2: 00007fa01b55a000 CR3: 000000000c660004 CR4: 0000000000771ef0
[    9.870048][  T167] PKRU: 55555554
[    9.870198][  T167] Call Trace:
[    9.870348][  T167]  <TASK>
[    9.870578][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.870764][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.870915][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    9.871100][  T167]  __dev_notify_flags (net/core/dev.c:9787)
[    9.871287][  T167]  ? netif_change_name (net/core/dev.c:1495)
[    9.871585][  T167]  ? __dev_change_flags (net/core/dev.c:9752)
[    9.871770][  T167]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    9.871955][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    9.872141][  T167]  netif_change_flags (net/core/dev.c:9820)
[    9.872443][  T167]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    9.872630][  T167]  dev_change_flags (net/core/dev_api.c:68)
[    9.872817][  T167]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    9.873004][  T167]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    9.873283][  T167]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    9.873496][  T167]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    9.873649][  T167]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    9.873837][  T167]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    9.874127][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    9.874312][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    9.874527][  T167]  sock_do_ioctl (net/socket.c:1313)
[    9.874716][  T167]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    9.874995][  T167]  ? ioctl_file_clone (fs/ioctl.c:244)
[    9.875184][  T167]  sock_ioctl (net/socket.c:1434)
[    9.875337][  T167]  ? br_ioctl_call (net/socket.c:1279)
[    9.875546][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    9.875830][  T167]  ? update_socket_protocol+0x10/0x10
[    9.876015][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[    9.876203][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.876408][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.876684][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.876869][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.877054][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.877269][  T167] RIP: 0033:0x47cc8d
[    9.877443][  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 
[    9.877973][  T167] RSP: 002b:00007ffde5f67760 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.878320][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.878596][  T167] RDX: 00007ffde5f677d0 RSI: 0000000000008914 RDI: 0000000000000006
[    9.878943][  T167] RBP: 00007ffde5f677b0 R08: 0000000000000000 R09: 0000000000000000
[    9.879195][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffde5f67c98
[    9.879468][  T167] R13: 00007ffde5f67d20 R14: 0000000000000002 R15: 0000000000543540
| [   99.624116][  T167] ------------[ cut here ]------------
| [   99.624422][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/167
| [   99.624774][  T167] Modules linked in:
| [   99.625314][  T167] Tainted: [W]=WARN
[   99.625554][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   99.625859][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   99.626172][  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
[   99.626811][  T167] RSP: 0018:ffa00000008476f0 EFLAGS: 00010286
[   99.627101][  T167] RAX: 00000000ffffffa6 RBX: ff110000092bbe40 RCX: 1ff4000000108ea4
[   99.627435][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000092bbef0
[   99.627772][  T167] RBP: ff11000009bc0000 R08: 1fe22000012577df R09: ff1100000c1bd158
[   99.628093][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000041
[   99.628426][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ffa0000000847790
[   99.628767][  T167] FS:  0000000000000000(0000) GS:ff110000a38d3000(0000) knlGS:0000000000000000
[   99.629131][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   99.629434][  T167] CR2: 0000556ee5349c20 CR3: 000000000d083006 CR4: 0000000000771ef0
[   99.629768][  T167] PKRU: 55555554
[   99.629984][  T167] Call Trace:
[   99.630201][  T167]  <TASK>
[   99.630402][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   99.630678][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   99.630904][  T167]  netif_close_many (net/core/dev.c:1804)
[   99.631206][  T167]  ? asym_cpu_capacity_scan (./include/linux/rculist.h:103)
[   99.631511][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   99.631772][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.632075][  T167]  ? __dev_close_many (net/core/dev.c:1781)
[   99.632368][  T167]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   99.632784][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   99.633126][  T167]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   99.633490][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   99.633828][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.634078][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.634370][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.634739][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   99.635038][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   99.635332][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   99.635594][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   99.635902][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.636194][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   99.636458][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   99.636763][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   99.637053][  T167]  __fput (fs/file_table.c:510)
[   99.637212][  T167]  task_work_run (kernel/task_work.c:233)
[   99.637416][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.637613][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[   99.637804][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   99.637998][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   99.638154][  T167]  ? exit_notify (kernel/exit.c:748)
[   99.638353][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.638561][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.638760][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   99.638952][  T167]  do_group_exit (kernel/exit.c:1119)
[   99.639142][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   99.639366][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.639567][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   99.639762][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   99.639950][  T167]  get_signal (kernel/signal.c:3037)
[   99.640146][  T167]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   99.640336][  T167]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   99.640536][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[   99.640747][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[   99.640944][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   99.641138][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   99.641333][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.641538][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   99.641773][  T167]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   99.641964][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.642157][  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)
[   99.642352][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[   99.642556][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   99.642794][  T167] RIP: 0033:0x4c2d9e
[   99.642961][  T167] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   99.643211][  T167] RSP: 002b:00007ffde5f670f0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   99.643501][  T167] RAX: 0000000000000014 RBX: 0000000000000012 RCX: 00000000004c2d9e
[   99.643857][  T167] RDX: 0000000000000014 RSI: 00007ffde5f671d0 RDI: 0000000000000007
[   99.644202][  T167] RBP: 00007ffde5f67100 R08: 00007ffde5f67190 R09: 000000000000000c
[   99.644579][  T167] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffde5f67c98
[   99.644854][  T167] R13: 00007ffde5f67d20 R14: 00007ffde5f672c0 R15: 0000000000543540
| [   99.652720][  T167] ------------[ cut here ]------------
| [   99.652919][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/167
| [   99.653248][  T167] Modules linked in:
| [   99.654892][  T167] Tainted: [W]=WARN
[   99.655612][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   99.656396][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   99.657120][  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
[   99.657699][  T167] RSP: 0018:ffa0000000847820 EFLAGS: 00010286
[   99.657924][  T167] RAX: 00000000ffffffa6 RBX: ff110000092baf40 RCX: 1ff4000000108eca
[   99.658181][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000092baff0
[   99.658456][  T167] RBP: ff11000009bc0000 R08: 1fe22000012575ff R09: ff1100000c1bd158
[   99.658721][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[   99.658979][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   99.659239][  T167] FS:  0000000000000000(0000) GS:ff110000a38d3000(0000) knlGS:0000000000000000
[   99.659544][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   99.659777][  T167] CR2: 0000556ee5349c20 CR3: 000000000d083006 CR4: 0000000000771ef0
[   99.660033][  T167] PKRU: 55555554
[   99.660186][  T167] Call Trace:
[   99.660341][  T167]  <TASK>
[   99.660480][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   99.660719][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   99.660939][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.661128][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.661318][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.661522][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   99.661722][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   99.661911][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   99.662100][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   99.662289][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.662489][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   99.662687][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   99.662879][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   99.663069][  T167]  __fput (fs/file_table.c:510)
[   99.663228][  T167]  task_work_run (kernel/task_work.c:233)
[   99.663429][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.663627][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[   99.663818][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   99.664010][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   99.664165][  T167]  ? exit_notify (kernel/exit.c:748)
[   99.664354][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.664556][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.664752][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   99.664942][  T167]  do_group_exit (kernel/exit.c:1119)
[   99.665131][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   99.665353][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.665553][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   99.665754][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   99.665944][  T167]  get_signal (kernel/signal.c:3037)
[   99.666135][  T167]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   99.666324][  T167]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   99.666523][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[   99.666723][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[   99.666915][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   99.667108][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   99.667301][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.667499][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   99.667738][  T167]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   99.667927][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.668119][  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)
[   99.668310][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[   99.668510][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   99.668743][  T167] RIP: 0033:0x4c2d9e
[   99.668903][  T167] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   99.669132][  T167] RSP: 002b:00007ffde5f670f0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   99.669405][  T167] RAX: 0000000000000014 RBX: 0000000000000012 RCX: 00000000004c2d9e
[   99.669675][  T167] RDX: 0000000000000014 RSI: 00007ffde5f671d0 RDI: 0000000000000007
[   99.669932][  T167] RBP: 00007ffde5f67100 R08: 00007ffde5f67190 R09: 000000000000000c
[   99.670191][  T167] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffde5f67c98
[   99.670462][  T167] R13: 00007ffde5f67d20 R14: 00007ffde5f672c0 R15: 0000000000543540
| [   99.686651][   T68] ------------[ cut here ]------------
| [   99.686937][   T68] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: 1/68
| [   99.687219][   T68] Modules linked in:
| [   99.687719][   T68] Tainted: [W]=WARN
[   99.687822][   T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   99.687989][   T68] Workqueue: netns cleanup_net
[   99.688151][   T68] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   99.688323][   T68] 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
[   99.688808][   T68] RSP: 0018:ffa0000000497878 EFLAGS: 00010286
[   99.688978][   T68] RAX: 00000000ffffffa6 RBX: ff11000009016dc0 RCX: 1ff4000000092ed5
[   99.689183][   T68] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009016e70
[   99.689390][   T68] RBP: ff11000007ea9000 R08: 1fe2200001202dcf R09: ff11000008c0aed0
[   99.689588][   T68] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   99.689791][   T68] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   99.689990][   T68] FS:  0000000000000000(0000) GS:ff110000a37d3000(0000) knlGS:0000000000000000
[   99.690224][   T68] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   99.690399][   T68] CR2: 00007f9c8e316f98 CR3: 0000000010d39006 CR4: 0000000000771ef0
[   99.690597][   T68] PKRU: 55555554
[   99.690703][   T68] Call Trace:
[   99.690802][   T68]  <TASK>
[   99.690873][   T68]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   99.691042][   T68]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   99.691209][   T68]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   99.691345][   T68]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   99.691484][   T68]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   99.691622][   T68]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   99.691756][   T68]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   99.691890][   T68]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   99.692022][   T68]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   99.692157][   T68]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   99.692291][   T68]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   99.692425][   T68]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.692561][   T68]  cleanup_net (net/core/net_namespace.c:702)
[   99.694022][   T68]  ? net_passive_dec (./include/linux/llist.h:241)
[   99.694180][   T68]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   99.694317][   T68]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   99.694461][   T68]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.694596][   T68]  process_one_work (kernel/workqueue.c:3314)
[   99.694743][   T68]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   99.694875][   T68]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   99.695013][   T68]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   99.695149][   T68]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   99.695280][   T68]  ? __kthread_parkme (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 kernel/kthread.c:272)
[   99.695421][   T68]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   99.695552][   T68]  kthread (kernel/kthread.c:436)
[   99.695660][   T68]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   99.695831][   T68]  ? kthread_affine_node (kernel/kthread.c:378)
[   99.695965][   T68]  ret_from_fork (arch/x86/kernel/process.c:158)
[   99.696106][   T68]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   99.696273][   T68]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   99.696410][   T68]  ? 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