======================================
| xx__-> [    8.874069][  T166] ------------[ cut here ]------------
| [    8.874290][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: unshare/166
| [    8.874651][  T166] Modules linked in:
| [    8.875132][  T166] Tainted: [W]=WARN
[    8.875246][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.875440][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.875637][  T166] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    8.876132][  T166] RSP: 0018:ffa0000000747ab0 EFLAGS: 00010286
[    8.876328][  T166] RAX: 00000000ffffffa6 RBX: ff1100000a44d3c0 RCX: 1ff40000000e8f1c
[    8.876541][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000a44d470
[    8.876757][  T166] RBP: ff1100000a2dc000 R08: 1fe2200001489a8f R09: ff1100000c70ae80
[    8.876965][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[    8.877172][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000a2dc000
[    8.877393][  T166] FS:  00007f904946b740(0000) GS:ff110000a8153000(0000) knlGS:0000000000000000
[    8.877640][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.877817][  T166] CR2: 0000555eea0ee310 CR3: 0000000009ef0004 CR4: 0000000000771ef0
[    8.878027][  T166] PKRU: 55555554
[    8.878133][  T166] Call Trace:
[    8.878238][  T166]  <TASK>
[    8.878311][  T166]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    8.878461][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.878606][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.878750][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.878860][  T166]  register_netdevice (net/core/dev.c:11488)
[    8.879007][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.879186][  T166]  register_netdev (net/core/dev.c:11552)
[    8.879327][  T166]  loopback_net_init (drivers/net/loopback.c:218)
[    8.879478][  T166]  ops_init (net/core/net_namespace.c:137)
[    8.879604][  T166]  setup_net (net/core/net_namespace.c:446)
[    8.879710][  T166]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    8.879848][  T166]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    8.879987][  T166]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    8.880128][  T166]  copy_net_ns (net/core/net_namespace.c:579)
[    8.880268][  T166]  create_new_namespaces (kernel/nsproxy.c:132)
[    8.880415][  T166]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    8.880554][  T166]  ksys_unshare (kernel/fork.c:3243)
[    8.880697][  T166]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    8.880838][  T166]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    8.880976][  T166]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    8.881115][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.881253][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.881429][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.881610][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.881780][  T166] RIP: 0033:0x7f9049566bcb
[    8.881922][  T166] Code: 73 01 c3 48 8b 0d 2d 82 0f 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d fd 81 0f 00 f7 d8 64 89 01 48
All code
========
   0:	73 01                	jae    0x3
   2:	c3                   	ret
   3:	48 8b 0d 2d 82 0f 00 	mov    0xf822d(%rip),%rcx        # 0xf8237
   a:	f7 d8                	neg    %eax
   c:	64 89 01             	mov    %eax,%fs:(%rcx)
   f:	48 83 c8 ff          	or     $0xffffffffffffffff,%rax
  13:	c3                   	ret
  14:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  1b:	00 00 00 
  1e:	90                   	nop
  1f:	f3 0f 1e fa          	endbr64
  23:	b8 10 01 00 00       	mov    $0x110,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax		<-- trapping instruction
  30:	73 01                	jae    0x33
  32:	c3                   	ret
  33:	48 8b 0d fd 81 0f 00 	mov    0xf81fd(%rip),%rcx        # 0xf8237
  3a:	f7 d8                	neg    %eax
  3c:	64 89 01             	mov    %eax,%fs:(%rcx)
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax
   6:	73 01                	jae    0x9
   8:	c3                   	ret
   9:	48 8b 0d fd 81 0f 00 	mov    0xf81fd(%rip),%rcx        # 0xf820d
  10:	f7 d8                	neg    %eax
  12:	64 89 01             	mov    %eax,%fs:(%rcx)
  15:	48                   	rex.W
[    8.882400][  T166] RSP: 002b:00007ffc70d253d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    8.882607][  T166] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9049566bcb
[    8.882818][  T166] RDX: 0000000000000000 RSI: 00007ffc70d25140 RDI: 0000000040000000
[    8.883025][  T166] RBP: 00007ffc70d25760 R08: 00007ffc70d25330 R09: 0000000000000000
[    8.883232][  T166] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    8.883445][  T166] R13: 0000000000000000 R14: 00000000ffffffff R15: 0000555eea0f1b68
| [    8.903134][  T166] ------------[ cut here ]------------
| [    8.903288][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [    8.903853][  T166] Modules linked in:
| [    8.904267][  T166] Tainted: [W]=WARN
[    8.904379][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.904549][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.904734][  T166] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    8.905202][  T166] RSP: 0018:ffa0000000747b58 EFLAGS: 00010286
[    8.905371][  T166] RAX: 00000000ffffffa6 RBX: ff1100000c5ff540 RCX: 1ff40000000e8f31
[    8.905567][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000c5ff5f0
[    8.905764][  T166] RBP: ff1100000cec8000 R08: 1fe22000018bfebf R09: ff1100000c70ae58
[    8.905954][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[    8.906145][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000cec8000
[    8.906337][  T166] FS:  0000000017aac400(0000) GS:ff110000a8153000(0000) knlGS:0000000000000000
[    8.906577][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.906740][  T166] CR2: 00007f4d20edd000 CR3: 000000000ce03005 CR4: 0000000000771ef0
[    8.906940][  T166] PKRU: 55555554
[    8.907036][  T166] Call Trace:
[    8.907132][  T166]  <TASK>
[    8.907200][  T166]  ? ip6_route_dev_notify (./include/net/net_namespace.h:419 (discriminator 1) ./include/linux/netdevice.h:2776 (discriminator 1) net/ipv6/route.c:6476 (discriminator 1))
[    8.907328][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.907461][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.907596][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.907694][  T166]  register_netdevice (net/core/dev.c:11488)
[    8.907830][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.907988][  T166]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    8.908119][  T166]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    8.908250][  T166]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    8.908385][  T166]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    8.908484][  T166]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    8.908614][  T166]  ? build_open_flags (fs/open.c:1212)
[    8.908742][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.908867][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    8.908993][  T166]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    8.909119][  T166]  ? fput_close_sync (fs/file_table.c:615)
[    8.909253][  T166]  ? __ia32_sys_open (fs/open.c:1374)
[    8.909389][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.909520][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.909660][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.909792][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.909918][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.910076][  T166] RIP: 0033:0x47cc8d
[    8.910178][  T166] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[    8.910638][  T166] RSP: 002b:00007ffea656bec0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.910829][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.911018][  T166] RDX: 00007ffea656bf40 RSI: 00000000400454ca RDI: 0000000000000005
[    8.911211][  T166] RBP: 00007ffea656bf10 R08: 0000000000000000 R09: 0000000000000000
[    8.911416][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffea656c418
[    8.911608][  T166] R13: 00007ffea656c4a0 R14: 0000000000000002 R15: 0000000000543540
| [    8.913332][  T166] ------------[ cut here ]------------
| [    8.913464][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [    8.913715][  T166] Modules linked in:
| [    8.914098][  T166] Tainted: [W]=WARN
[    8.914196][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.914359][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.914522][  T166] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    8.914979][  T166] RSP: 0018:ffa0000000747c58 EFLAGS: 00010286
[    8.915142][  T166] RAX: 00000000ffffffa6 RBX: ff1100000c5fedc0 RCX: 1ff40000000e8f51
[    8.915338][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000c5fee70
[    8.915534][  T166] RBP: ff1100000cec8000 R08: 1fe22000018bfdcf R09: ff1100000c70ae58
[    8.915727][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
[    8.915919][  T166] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000003
[    8.916108][  T166] FS:  0000000017aac400(0000) GS:ff110000a8153000(0000) knlGS:0000000000000000
[    8.916327][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.916489][  T166] CR2: 00007f4d20edd000 CR3: 000000000ce03005 CR4: 0000000000771ef0
[    8.916683][  T166] PKRU: 55555554
[    8.916777][  T166] Call Trace:
[    8.916870][  T166]  <TASK>
[    8.916935][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    8.917065][  T166]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    8.917194][  T166]  notifier_call_chain (kernel/notifier.c:85)
[    8.917325][  T166]  netdev_update_features (net/core/dev.c:2287 net/core/dev.c:2301 net/core/dev.c:1590 net/core/dev.c:11099 net/core/dev.c:11096)
[    8.917455][  T166]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    8.917618][  T166]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    8.917748][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.917877][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.918005][  T166]  ? update_socket_protocol+0x10/0x10
[    8.918131][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    8.918260][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.918394][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.918525][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.918653][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.918778][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.918933][  T166] RIP: 0033:0x47cc8d
[    8.919031][  T166] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[    8.919487][  T166] RSP: 002b:00007ffea656bf00 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.919681][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.919867][  T166] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    8.920054][  T166] RBP: 00007ffea656bf50 R08: 0000000000000000 R09: 0000000000000000
[    8.920240][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffea656c418
[    8.920440][  T166] R13: 00007ffea656c4a0 R14: 0000000000000002 R15: 0000000000543540
| [    8.929401][  T166] ------------[ cut here ]------------
| [    8.929549][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [    8.929832][  T166] Modules linked in:
| [    8.930246][  T166] Tainted: [W]=WARN
[    8.930347][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.930520][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.930696][  T166] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    8.931178][  T166] RSP: 0018:ffa0000000747850 EFLAGS: 00010286
[    8.931364][  T166] RAX: 00000000ffffffa6 RBX: ff1100000c5fe640 RCX: 1ff40000000e8ed0
[    8.931577][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000c5fe6f0
[    8.931793][  T166] RBP: ff1100000cec8000 R08: 1fe22000018bfcdf R09: ff1100000c70ae58
[    8.932010][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000001
[    8.932213][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff110000058e91c0
[    8.932425][  T166] FS:  0000000017aac400(0000) GS:ff110000a8153000(0000) knlGS:0000000000000000
[    8.932667][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.932858][  T166] CR2: 00007f4d20edd000 CR3: 000000000ce03005 CR4: 0000000000771ef0
[    8.933063][  T166] PKRU: 55555554
[    8.933171][  T166] Call Trace:
[    8.933276][  T166]  <TASK>
[    8.933356][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.933502][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.933613][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    8.933751][  T166]  __dev_notify_flags (net/core/dev.c:9787)
[    8.933885][  T166]  ? netif_change_name (net/core/dev.c:1495)
[    8.934017][  T166]  ? __dev_change_flags (net/core/dev.c:9752)
[    8.934151][  T166]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    8.934285][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    8.934423][  T166]  netif_change_flags (net/core/dev.c:9820)
[    8.934555][  T166]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    8.934697][  T166]  dev_change_flags (net/core/dev_api.c:68)
[    8.934830][  T166]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    8.934969][  T166]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    8.935113][  T166]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    8.935265][  T166]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    8.935388][  T166]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    8.935536][  T166]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    8.935690][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.935840][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.935987][  T166]  sock_do_ioctl (net/socket.c:1313)
[    8.936127][  T166]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    8.936267][  T166]  ? ioctl_file_clone (fs/ioctl.c:244)
[    8.936414][  T166]  sock_ioctl (net/socket.c:1434)
[    8.936523][  T166]  ? br_ioctl_call (net/socket.c:1279)
[    8.936675][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.936818][  T166]  ? update_socket_protocol+0x10/0x10
[    8.936965][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    8.937112][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.937252][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.937392][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.937525][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.937678][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.937844][  T166] RIP: 0033:0x47cc8d
[    8.937951][  T166] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[    8.938436][  T166] RSP: 002b:00007ffea656bee0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.938644][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.938850][  T166] RDX: 00007ffea656bf50 RSI: 0000000000008914 RDI: 0000000000000006
[    8.939057][  T166] RBP: 00007ffea656bf30 R08: 0000000000000000 R09: 0000000000000000
[    8.939259][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffea656c418
[    8.939465][  T166] R13: 00007ffea656c4a0 R14: 0000000000000002 R15: 0000000000543540
| [   98.704671][  T166] ------------[ cut here ]------------
| [   98.704862][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/166
| [   98.705144][  T166] Modules linked in:
| [   98.705569][  T166] Tainted: [W]=WARN
[   98.705672][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.705853][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.706030][  T166] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   98.706516][  T166] RSP: 0018:ffa00000007476f0 EFLAGS: 00010286
[   98.706690][  T166] RAX: 00000000ffffffa6 RBX: ff11000004aef6c0 RCX: 1ff40000000e8ea4
[   98.706953][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004aef770
[   98.707183][  T166] RBP: ff1100000cec8000 R08: 1fe220000095deef R09: ff1100000c70ae58
[   98.707389][  T166] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000041
[   98.707590][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ffa0000000747790
[   98.707792][  T166] FS:  0000000000000000(0000) GS:ff110000a7fd3000(0000) knlGS:0000000000000000
[   98.708033][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.708200][  T166] CR2: 00007f429be946f0 CR3: 0000000014339002 CR4: 0000000000771ef0
[   98.708408][  T166] PKRU: 55555554
[   98.708509][  T166] Call Trace:
[   98.708611][  T166]  <TASK>
[   98.708680][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   98.708815][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   98.708948][  T166]  netif_close_many (net/core/dev.c:1804)
[   98.709085][  T166]  ? asym_cpu_capacity_scan (./include/linux/rculist.h:103)
[   98.709221][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.709360][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.709493][  T166]  ? __dev_close_many (net/core/dev.c:1781)
[   98.709624][  T166]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   98.709789][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   98.709969][  T166]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   98.710108][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.710271][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.710410][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.710543][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.710682][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.710823][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.710962][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.711095][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.711228][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.711368][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.711504][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.711640][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.711771][  T166]  __fput (fs/file_table.c:510)
[   98.711882][  T166]  task_work_run (kernel/task_work.c:233)
[   98.712014][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.712151][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.712285][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.712426][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.712528][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.712659][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.712792][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.712928][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.713062][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.713193][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.713364][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.713503][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.713637][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.713770][  T166]  get_signal (kernel/signal.c:3037)
[   98.713910][  T166]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.714042][  T166]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.714177][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.714319][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.714465][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.714600][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.714757][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.714938][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.715071][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.715206][  T166]  do_syscall_64 (./include/linux/irq-entry-common.h:207 ./include/linux/irq-entry-common.h:230 ./include/linux/entry-common.h:318 arch/x86/entry/syscall_64.c:100)
[   98.715396][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.715537][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.715726][  T166] RIP: 0033:0x4c2d9e
[   98.715833][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.716023][  T166] RSP: 002b:00007ffea656b870 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.716226][  T166] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[   98.716429][  T166] RDX: 0000000000000014 RSI: 00007ffea656b950 RDI: 0000000000000007
[   98.716647][  T166] RBP: 00007ffea656b880 R08: 00007ffea656b910 R09: 000000000000000c
[   98.716885][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000017abd360
[   98.717085][  T166] R13: 00007ffea656c4a0 R14: 00007ffea656ba40 R15: 0000000000543540
| [   98.721644][  T166] ------------[ cut here ]------------
| [   98.721810][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/166
| [   98.722071][  T166] Modules linked in:
| [   98.722496][  T166] Tainted: [W]=WARN
[   98.722597][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.722759][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.722930][  T166] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   98.723398][  T166] RSP: 0018:ffa0000000747820 EFLAGS: 00010286
[   98.723575][  T166] RAX: 00000000ffffffa6 RBX: ff1100000b3a4dc0 RCX: 1ff40000000e8eca
[   98.723777][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000b3a4e70
[   98.723975][  T166] RBP: ff1100000cec8000 R08: 1fe22000016749cf R09: ff1100000c70ae58
[   98.724171][  T166] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   98.724367][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.724674][  T166] FS:  0000000000000000(0000) GS:ff110000a7fd3000(0000) knlGS:0000000000000000
[   98.724912][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.725077][  T166] CR2: 00007f429be946f0 CR3: 0000000014339002 CR4: 0000000000771ef0
[   98.725882][  T166] PKRU: 55555554
[   98.726008][  T166] Call Trace:
[   98.726111][  T166]  <TASK>
[   98.726181][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.726349][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.728469][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.728632][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.728762][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.728924][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.729058][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.729191][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.729323][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.729956][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.730091][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.730223][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.730903][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.731069][  T166]  __fput (fs/file_table.c:510)
[   98.731173][  T166]  task_work_run (kernel/task_work.c:233)
[   98.731300][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.731481][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.731608][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.731738][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.731837][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.731970][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.732113][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.732245][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.732385][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.732518][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.732682][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.732819][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.732954][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.733083][  T166]  get_signal (kernel/signal.c:3037)
[   98.733213][  T166]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.733340][  T166]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.733475][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.733607][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.733738][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.733874][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.734002][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.734164][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.734292][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.734427][  T166]  do_syscall_64 (./include/linux/irq-entry-common.h:207 ./include/linux/irq-entry-common.h:230 ./include/linux/entry-common.h:318 arch/x86/entry/syscall_64.c:100)
[   98.734560][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.734692][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.734856][  T166] RIP: 0033:0x4c2d9e
[   98.734959][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.735121][  T166] RSP: 002b:00007ffea656b870 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.735317][  T166] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[   98.735521][  T166] RDX: 0000000000000014 RSI: 00007ffea656b950 RDI: 0000000000000007
[   98.735729][  T166] RBP: 00007ffea656b880 R08: 00007ffea656b910 R09: 000000000000000c
[   98.735925][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000017abd360
[   98.736119][  T166] R13: 00007ffea656c4a0 R14: 00007ffea656ba40 R15: 0000000000543540
| [   98.750746][   T68] ------------[ cut here ]------------
| [   98.750947][   T68] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#1: 1/68
| [   98.751203][   T68] Modules linked in:
| [   98.752127][   T68] Tainted: [W]=WARN
[   98.752282][   T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.752487][   T68] Workqueue: netns cleanup_net
[   98.752629][   T68] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.752788][   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
[   98.753221][   T68] RSP: 0018:ffa0000000497878 EFLAGS: 00010286
[   98.753422][   T68] RAX: 00000000ffffffa6 RBX: ff1100000b3a44c0 RCX: 1ff4000000092ed5
[   98.753610][   T68] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000b3a4570
[   98.753787][   T68] RBP: ff1100000a2dc000 R08: 1fe22000016748af R09: ff11000007832ed0
[   98.753973][   T68] R10: 0000000000000001 R11: 0000000000000001 R12: 00000000ffffffff
[   98.754160][   T68] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.754346][   T68] FS:  0000000000000000(0000) GS:ff110000a8053000(0000) knlGS:0000000000000000
[   98.754606][   T68] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.754761][   T68] CR2: 00007f8355b07f98 CR3: 0000000014339001 CR4: 0000000000771ef0
[   98.754949][   T68] PKRU: 55555554
[   98.755041][   T68] Call Trace:
[   98.755136][   T68]  <TASK>
[   98.755201][   T68]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.755408][   T68]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.755563][   T68]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   98.755685][   T68]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   98.755806][   T68]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   98.755935][   T68]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   98.756062][   T68]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   98.756187][   T68]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   98.756310][   T68]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   98.756481][   T68]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   98.756606][   T68]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   98.756725][   T68]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.756854][   T68]  cleanup_net (net/core/net_namespace.c:702)
[   98.756975][   T68]  ? net_passive_dec (./include/linux/llist.h:241)
[   98.757093][   T68]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   98.757217][   T68]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   98.757336][   T68]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.757504][   T68]  process_one_work (kernel/workqueue.c:3314)
[   98.757653][   T68]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   98.757773][   T68]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.757903][   T68]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   98.758024][   T68]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.758145][   T68]  ? __kthread_parkme (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 kernel/kthread.c:272)
[   98.758266][   T68]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.758437][   T68]  kthread (kernel/kthread.c:436)
[   98.758528][   T68]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.758697][   T68]  ? kthread_affine_node (kernel/kthread.c:378)
[   98.758818][   T68]  ret_from_fork (arch/x86/kernel/process.c:158)
[   98.758947][   T68]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   98.759098][   T68]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   98.759224][   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