======================================
| xx__-> [    8.809023][  T167] ------------[ cut here ]------------
| [    8.809256][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: unshare/167
| [    8.809658][  T167] Modules linked in:
| [    8.810106][  T167] Tainted: [W]=WARN
[    8.810206][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.810378][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.810556][  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
[    8.811058][  T167] RSP: 0018:ffa00000007d7ab0 EFLAGS: 00010286
[    8.811225][  T167] RAX: 00000000ffffffa6 RBX: ff1100000af1b0c0 RCX: 1ff40000000faf1c
[    8.811428][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000af1b170
[    8.811646][  T167] RBP: ff1100000a054000 R08: 1fe22000015e362f R09: ff1100000c67ae80
[    8.811867][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[    8.812063][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000a054000
[    8.812260][  T167] FS:  00007f20783d5740(0000) GS:ff110000877d3000(0000) knlGS:0000000000000000
[    8.812516][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.812684][  T167] CR2: 00007f20784a0820 CR3: 000000000d793004 CR4: 0000000000771ef0
[    8.812904][  T167] PKRU: 55555554
[    8.813004][  T167] Call Trace:
[    8.813102][  T167]  <TASK>
[    8.813173][  T167]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    8.813306][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.813461][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.813595][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.813699][  T167]  register_netdevice (net/core/dev.c:11488)
[    8.813854][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.814019][  T167]  register_netdev (net/core/dev.c:11552)
[    8.814149][  T167]  loopback_net_init (drivers/net/loopback.c:218)
[    8.814284][  T167]  ops_init (net/core/net_namespace.c:137)
[    8.814391][  T167]  setup_net (net/core/net_namespace.c:446)
[    8.814495][  T167]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    8.814628][  T167]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    8.814797][  T167]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    8.814937][  T167]  copy_net_ns (net/core/net_namespace.c:579)
[    8.815069][  T167]  create_new_namespaces (kernel/nsproxy.c:132)
[    8.815202][  T167]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    8.815333][  T167]  ksys_unshare (kernel/fork.c:3243)
[    8.815471][  T167]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    8.815605][  T167]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    8.815762][  T167]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    8.815899][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.816062][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.816197][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.816328][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.816496][  T167] RIP: 0033:0x7f20784d0bcb
[    8.816658][  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
[    8.817127][  T167] RSP: 002b:00007ffde8c6fa88 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    8.817326][  T167] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f20784d0bcb
[    8.817524][  T167] RDX: 0000000000000000 RSI: 00007ffde8c6f7f0 RDI: 0000000040000000
[    8.817746][  T167] RBP: 00007ffde8c6fe10 R08: 00007ffde8c6f9e0 R09: 0000000000000000
[    8.817971][  T167] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    8.818166][  T167] R13: 0000000000000000 R14: 00000000ffffffff R15: 000055d8ef89bb68
| [    8.836238][  T167] ------------[ cut here ]------------
| [    8.836406][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [    8.836649][  T167] Modules linked in:
| [    8.837019][  T167] Tainted: [W]=WARN
[    8.837110][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.837260][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.837418][  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
[    8.837876][  T167] RSP: 0018:ffa00000007d7b58 EFLAGS: 00010286
[    8.838027][  T167] RAX: 00000000ffffffa6 RBX: ff1100000b9b3540 RCX: 1ff40000000faf31
[    8.838206][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000b9b35f0
[    8.838438][  T167] RBP: ff1100000a2e0000 R08: 1fe22000017366bf R09: ff1100000c67ae58
[    8.838616][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[    8.838793][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000a2e0000
[    8.838979][  T167] FS:  0000000014209400(0000) GS:ff110000877d3000(0000) knlGS:0000000000000000
[    8.839186][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.839336][  T167] CR2: 00007fea3a813000 CR3: 000000000c2e3005 CR4: 0000000000771ef0
[    8.839519][  T167] PKRU: 55555554
[    8.839608][  T167] Call Trace:
[    8.839697][  T167]  <TASK>
[    8.839761][  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))
[    8.839887][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.840007][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.840126][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.840218][  T167]  register_netdevice (net/core/dev.c:11488)
[    8.840339][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.840493][  T167]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    8.840616][  T167]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    8.840738][  T167]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    8.840869][  T167]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    8.840960][  T167]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    8.841080][  T167]  ? build_open_flags (fs/open.c:1212)
[    8.841201][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.841319][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    8.841444][  T167]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    8.841563][  T167]  ? fput_close_sync (fs/file_table.c:615)
[    8.841704][  T167]  ? __ia32_sys_open (fs/open.c:1374)
[    8.841827][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.841949][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.842067][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.842186][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.842304][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.842459][  T167] RIP: 0033:0x47cc8d
[    8.842553][  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 
[    8.842994][  T167] RSP: 002b:00007ffcd03e08d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.843177][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.843354][  T167] RDX: 00007ffcd03e0950 RSI: 00000000400454ca RDI: 0000000000000005
[    8.843537][  T167] RBP: 00007ffcd03e0920 R08: 0000000000000000 R09: 0000000000000000
[    8.843715][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcd03e0e28
[    8.843921][  T167] R13: 00007ffcd03e0eb0 R14: 0000000000000002 R15: 0000000000543540
| [    8.845541][  T167] ------------[ cut here ]------------
| [    8.845657][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [    8.845900][  T167] Modules linked in:
| [    8.846258][  T167] Tainted: [W]=WARN
[    8.846348][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.846505][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.846661][  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
[    8.847086][  T167] RSP: 0018:ffa00000007d7c58 EFLAGS: 00010286
[    8.847236][  T167] RAX: 00000000ffffffa6 RBX: ff1100000b9b24c0 RCX: 1ff40000000faf51
[    8.847425][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000b9b2570
[    8.847611][  T167] RBP: ff1100000a2e0000 R08: 1fe22000017364af R09: ff1100000c67ae58
[    8.847788][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[    8.847992][  T167] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
[    8.848172][  T167] FS:  0000000014209400(0000) GS:ff110000877d3000(0000) knlGS:0000000000000000
[    8.848387][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.848535][  T167] CR2: 00007fea3a813000 CR3: 000000000c2e3005 CR4: 0000000000771ef0
[    8.848714][  T167] PKRU: 55555554
[    8.848804][  T167] Call Trace:
[    8.848898][  T167]  <TASK>
[    8.848960][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    8.849080][  T167]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    8.849200][  T167]  notifier_call_chain (kernel/notifier.c:85)
[    8.849321][  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)
[    8.849443][  T167]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    8.849592][  T167]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    8.849712][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.849845][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.849968][  T167]  ? update_socket_protocol+0x10/0x10
[    8.850089][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[    8.850210][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.850341][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.850465][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.850592][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.850711][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.850865][  T167] RIP: 0033:0x47cc8d
[    8.850960][  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 
[    8.851390][  T167] RSP: 002b:00007ffcd03e0910 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.851577][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.851756][  T167] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    8.851939][  T167] RBP: 00007ffcd03e0960 R08: 0000000000000000 R09: 0000000000000000
[    8.852124][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcd03e0e28
[    8.852310][  T167] R13: 00007ffcd03e0eb0 R14: 0000000000000002 R15: 0000000000543540
| [    8.853992][  T167] ------------[ cut here ]------------
| [    8.854119][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [    8.854370][  T167] Modules linked in:
| [    8.854762][  T167] Tainted: [W]=WARN
[    8.854862][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.855043][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.855213][  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
[    8.855680][  T167] RSP: 0018:ffa00000007d7850 EFLAGS: 00010286
[    8.855845][  T167] RAX: 00000000ffffffa6 RBX: ff1100000b9b36c0 RCX: 1ff40000000faed0
[    8.856035][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000b9b3770
[    8.856224][  T167] RBP: ff1100000a2e0000 R08: 1fe22000017366ef R09: ff1100000c67ae58
[    8.856417][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
[    8.856605][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff110000057a8900
[    8.856795][  T167] FS:  0000000014209400(0000) GS:ff110000877d3000(0000) knlGS:0000000000000000
[    8.857022][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.857194][  T167] CR2: 00007fea3a813000 CR3: 000000000c2e3005 CR4: 0000000000771ef0
[    8.857386][  T167] PKRU: 55555554
[    8.857480][  T167] Call Trace:
[    8.857574][  T167]  <TASK>
[    8.857640][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.857767][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.857869][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    8.857996][  T167]  __dev_notify_flags (net/core/dev.c:9787)
[    8.858123][  T167]  ? netif_change_name (net/core/dev.c:1495)
[    8.858249][  T167]  ? __dev_change_flags (net/core/dev.c:9752)
[    8.858378][  T167]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    8.858506][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    8.858633][  T167]  netif_change_flags (net/core/dev.c:9820)
[    8.858759][  T167]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    8.858894][  T167]  dev_change_flags (net/core/dev_api.c:68)
[    8.859021][  T167]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    8.859149][  T167]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    8.859277][  T167]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    8.859411][  T167]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    8.859508][  T167]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    8.859633][  T167]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    8.859767][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.859900][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.860026][  T167]  sock_do_ioctl (net/socket.c:1313)
[    8.860153][  T167]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    8.860282][  T167]  ? ioctl_file_clone (fs/ioctl.c:244)
[    8.860430][  T167]  sock_ioctl (net/socket.c:1434)
[    8.860528][  T167]  ? br_ioctl_call (net/socket.c:1279)
[    8.860656][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.860786][  T167]  ? update_socket_protocol+0x10/0x10
[    8.860924][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[    8.861052][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.861180][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.861306][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.861437][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.861563][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.861720][  T167] RIP: 0033:0x47cc8d
[    8.861824][  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 
[    8.862274][  T167] RSP: 002b:00007ffcd03e08f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.862470][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.862662][  T167] RDX: 00007ffcd03e0960 RSI: 0000000000008914 RDI: 0000000000000006
[    8.862854][  T167] RBP: 00007ffcd03e0940 R08: 0000000000000000 R09: 0000000000000000
[    8.863043][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcd03e0e28
[    8.863240][  T167] R13: 00007ffcd03e0eb0 R14: 0000000000000002 R15: 0000000000543540
| [   98.654355][  T167] ------------[ cut here ]------------
| [   98.654545][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [   98.654838][  T167] Modules linked in:
| [   98.655267][  T167] Tainted: [W]=WARN
[   98.655373][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.655546][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.655731][  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
[   98.656223][  T167] RSP: 0018:ffa00000007d76f0 EFLAGS: 00010286
[   98.656396][  T167] RAX: 00000000ffffffa6 RBX: ff11000004bb3240 RCX: 1ff40000000faea4
[   98.656602][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004bb32f0
[   98.656817][  T167] RBP: ff1100000a2e0000 R08: 1fe220000097665f R09: ff1100000c67ae58
[   98.657023][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000041
[   98.657231][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ffa00000007d7790
[   98.657436][  T167] FS:  0000000000000000(0000) GS:ff110000877d3000(0000) knlGS:0000000000000000
[   98.657682][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.657858][  T167] CR2: 00007f66ba2b36f0 CR3: 0000000031f39003 CR4: 0000000000771ef0
[   98.658065][  T167] PKRU: 55555554
[   98.658168][  T167] Call Trace:
[   98.658270][  T167]  <TASK>
[   98.658343][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   98.658482][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   98.658587][  T167]  netif_close_many (net/core/dev.c:1804)
[   98.658728][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.658871][  T167]  ? __dev_close_many (net/core/dev.c:1781)
[   98.659007][  T167]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   98.659179][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   98.659352][  T167]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   98.659489][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.659665][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.659800][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.659998][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.660136][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.660274][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.660410][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.660546][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.660688][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.660880][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.661021][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.661159][  T167]  __fput (fs/file_table.c:510)
[   98.661266][  T167]  task_work_run (kernel/task_work.c:233)
[   98.661404][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.661539][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[   98.661679][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.661875][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.661980][  T167]  ? exit_notify (kernel/exit.c:748)
[   98.662113][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.662250][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.662387][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.662524][  T167]  do_group_exit (kernel/exit.c:1119)
[   98.662663][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.662887][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.663022][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.663159][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.663294][  T167]  get_signal (kernel/signal.c:3037)
[   98.663432][  T167]  ? __raw_spin_lock_init (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/spinlock_debug.c:25)
[   98.663571][  T167]  ? mark_usage (kernel/locking/lockdep.c:4674)
[   98.663710][  T167]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   98.663904][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.664041][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.664179][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.664398][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.664538][  T167]  ? fd_install (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:960 (discriminator 2) fs/file.c:699 (discriminator 2))
[   98.664677][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.664888][  T167]  ? update_socket_protocol+0x10/0x10
[   98.665026][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[   98.665164][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.665302][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.665474][  T167]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.665614][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.665756][  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)
[   98.665983][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.666122][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.666292][  T167] RIP: 0033:0x47ea2b
[   98.666403][  T167] Code: Unable to access opcode bytes at 0x47ea01.

Code starting with the faulting instruction
===========================================
[   98.666596][  T167] RSP: 002b:00007ffcd03e0378 EFLAGS: 00000202 ORIG_RAX: 0000000000000029
[   98.666890][  T167] RAX: 0000000000000007 RBX: 00007ffcd03e0450 RCX: 000000000047ea2b
[   98.667092][  T167] RDX: 0000000000000000 RSI: 0000000000080003 RDI: 0000000000000010
[   98.667296][  T167] RBP: 00007ffcd03e03b0 R08: 0000000000000041 R09: 000000001420a3e0
[   98.667503][  T167] R10: 0000000000000040 R11: 0000000000000202 R12: 00007ffcd03e0e28
[   98.667711][  T167] R13: 00007ffcd03e0eb0 R14: 00007ffcd03e0928 R15: 0000000000543540
| [   98.674185][  T167] ------------[ cut here ]------------
| [   98.674337][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [   98.674599][  T167] Modules linked in:
| [   98.675016][  T167] Tainted: [W]=WARN
[   98.675116][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.675281][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.675457][  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
[   98.675939][  T167] RSP: 0018:ffa00000007d7820 EFLAGS: 00010286
[   98.676107][  T167] RAX: 00000000ffffffa6 RBX: ff1100000b9afb40 RCX: 1ff40000000faeca
[   98.676305][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000b9afbf0
[   98.676501][  T167] RBP: ff1100000a2e0000 R08: 1fe2200001735f7f R09: ff1100000c67ae58
[   98.676701][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   98.676926][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.677126][  T167] FS:  0000000000000000(0000) GS:ff110000877d3000(0000) knlGS:0000000000000000
[   98.677357][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.677522][  T167] CR2: 00007f66ba2b36f0 CR3: 0000000031f39003 CR4: 0000000000771ef0
[   98.677726][  T167] PKRU: 55555554
[   98.677827][  T167] Call Trace:
[   98.677925][  T167]  <TASK>
[   98.677993][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.678162][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.678324][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.678455][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.678586][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.678723][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.678859][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.678990][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.679121][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.679251][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.679382][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.679520][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.679654][  T167]  __fput (fs/file_table.c:510)
[   98.679757][  T167]  task_work_run (kernel/task_work.c:233)
[   98.679892][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.680024][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[   98.680156][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.680291][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.680391][  T167]  ? exit_notify (kernel/exit.c:748)
[   98.680522][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.680657][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.680787][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.680925][  T167]  do_group_exit (kernel/exit.c:1119)
[   98.681057][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.681222][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.681355][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.681486][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.681617][  T167]  get_signal (kernel/signal.c:3037)
[   98.681753][  T167]  ? __raw_spin_lock_init (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/spinlock_debug.c:25)
[   98.681889][  T167]  ? mark_usage (kernel/locking/lockdep.c:4674)
[   98.682020][  T167]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   98.682152][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.682286][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.682417][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.682550][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.682683][  T167]  ? fd_install (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:960 (discriminator 2) fs/file.c:699 (discriminator 2))
[   98.682821][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.682956][  T167]  ? update_socket_protocol+0x10/0x10
[   98.683092][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[   98.683222][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.683355][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.683523][  T167]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.683658][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.683792][  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)
[   98.683928][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.684060][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.684222][  T167] RIP: 0033:0x47ea2b
[   98.684326][  T167] Code: Unable to access opcode bytes at 0x47ea01.

Code starting with the faulting instruction
===========================================
[   98.684497][  T167] RSP: 002b:00007ffcd03e0378 EFLAGS: 00000202 ORIG_RAX: 0000000000000029
[   98.684699][  T167] RAX: 0000000000000007 RBX: 00007ffcd03e0450 RCX: 000000000047ea2b
[   98.684904][  T167] RDX: 0000000000000000 RSI: 0000000000080003 RDI: 0000000000000010
[   98.685100][  T167] RBP: 00007ffcd03e03b0 R08: 0000000000000041 R09: 000000001420a3e0
[   98.685296][  T167] R10: 0000000000000040 R11: 0000000000000202 R12: 00007ffcd03e0e28
[   98.685494][  T167] R13: 00007ffcd03e0eb0 R14: 00007ffcd03e0928 R15: 0000000000543540
| [   98.708822][   T71] ------------[ cut here ]------------
| [   98.709039][   T71] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: 1/71
| [   98.709371][   T71] Modules linked in:
| [   98.709880][   T71] Tainted: [W]=WARN
[   98.710017][   T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.710219][   T71] Workqueue: netns cleanup_net
[   98.710406][   T71] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.710618][   T71] 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
[   98.711163][   T71] RSP: 0018:ffa00000004c7878 EFLAGS: 00010286
[   98.711364][   T71] RAX: 00000000ffffffa6 RBX: ff110000027647c0 RCX: 1ff4000000098ed5
[   98.711594][   T71] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000002764870
[   98.712130][   T71] RBP: ff1100000a054000 R08: 1fe22000004ec90f R09: ff11000008c3aed0
[   98.712361][   T71] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[   98.712605][   T71] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.712859][   T71] FS:  0000000000000000(0000) GS:ff110000878d3000(0000) knlGS:0000000000000000
[   98.713115][   T71] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.713312][   T71] CR2: 00007f588ef62f98 CR3: 0000000009bb9003 CR4: 0000000000771ef0
[   98.713541][   T71] PKRU: 55555554
[   98.713684][   T71] Call Trace:
[   98.713832][   T71]  <TASK>
[   98.713941][   T71]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.714149][   T71]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.714351][   T71]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   98.714524][   T71]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   98.714701][   T71]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   98.714883][   T71]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   98.715056][   T71]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   98.715228][   T71]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   98.715395][   T71]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   98.715566][   T71]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   98.715745][   T71]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   98.715923][   T71]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.716097][   T71]  cleanup_net (net/core/net_namespace.c:702)
[   98.716269][   T71]  ? net_passive_dec (./include/linux/llist.h:241)
[   98.716436][   T71]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   98.716610][   T71]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   98.716784][   T71]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.716969][   T71]  process_one_work (kernel/workqueue.c:3314)
[   98.717142][   T71]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   98.717312][   T71]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.717484][   T71]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   98.717659][   T71]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.717842][   T71]  ? __kthread_parkme (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 kernel/kthread.c:272)
[   98.718010][   T71]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.718176][   T71]  kthread (kernel/kthread.c:436)
[   98.718314][   T71]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.718508][   T71]  ? kthread_affine_node (kernel/kthread.c:378)
[   98.718685][   T71]  ret_from_fork (arch/x86/kernel/process.c:158)
[   98.718870][   T71]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   98.719070][   T71]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   98.719240][   T71]  ? 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