======================================
| xx__-> [    8.384298][  T166] ------------[ cut here ]------------
| [    8.384546][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: unshare/166
| [    8.384808][  T166] Modules linked in:
| [    8.385199][  T166] Tainted: [W]=WARN
[    8.385298][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.385465][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.385632][  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
[    8.386095][  T166] RSP: 0018:ffa0000000857ab0 EFLAGS: 00010286
[    8.386259][  T166] RAX: 00000000ffffffa6 RBX: ff11000008c72c40 RCX: 1ff400000010af1c
[    8.386453][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000008c72cf0
[    8.386692][  T166] RBP: ff11000009b81000 R08: 1fe220000118e59f R09: ff1100000d7d0b80
[    8.386885][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[    8.387088][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000009b81000
[    8.387280][  T166] FS:  00007f4a1b87c740(0000) GS:ff110000a1153000(0000) knlGS:0000000000000000
[    8.387509][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.387670][  T166] CR2: 000055eba5e30310 CR3: 000000000c9b7001 CR4: 0000000000771ef0
[    8.387863][  T166] PKRU: 55555554
[    8.387960][  T166] Call Trace:
[    8.388056][  T166]  <TASK>
[    8.388128][  T166]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    8.388257][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.388384][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.388519][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.388616][  T166]  register_netdevice (net/core/dev.c:11488)
[    8.388745][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.388905][  T166]  register_netdev (net/core/dev.c:11552)
[    8.389032][  T166]  loopback_net_init (drivers/net/loopback.c:218)
[    8.389165][  T166]  ops_init (net/core/net_namespace.c:137)
[    8.389264][  T166]  setup_net (net/core/net_namespace.c:446)
[    8.389360][  T166]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    8.389490][  T166]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    8.389618][  T166]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    8.389748][  T166]  copy_net_ns (net/core/net_namespace.c:579)
[    8.389876][  T166]  create_new_namespaces (kernel/nsproxy.c:132)
[    8.390004][  T166]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    8.390136][  T166]  ksys_unshare (kernel/fork.c:3243)
[    8.390264][  T166]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    8.390394][  T166]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    8.390525][  T166]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    8.390653][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.390779][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.390907][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.391034][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.391247][  T166] RIP: 0033:0x7f4a1b977bcb
[    8.391400][  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
[    8.391852][  T166] RSP: 002b:00007ffc46766428 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    8.392043][  T166] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4a1b977bcb
[    8.392234][  T166] RDX: 0000000000000000 RSI: 00007ffc46766190 RDI: 0000000040000000
[    8.392424][  T166] RBP: 00007ffc467667b0 R08: 00007ffc46766380 R09: 0000000000000000
[    8.392616][  T166] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    8.392805][  T166] R13: 0000000000000000 R14: 00000000ffffffff R15: 000055eba5e33b68
| [    8.421834][  T166] ------------[ cut here ]------------
| [    8.421974][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [    8.422216][  T166] Modules linked in:
| [    8.422576][  T166] Tainted: [W]=WARN
[    8.422664][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.422808][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.422960][  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
[    8.423570][  T166] RSP: 0018:ffa0000000857b58 EFLAGS: 00010286
[    8.423729][  T166] RAX: 00000000ffffffa6 RBX: ff11000004d97e40 RCX: 1ff400000010af31
[    8.423905][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004d97ef0
[    8.424083][  T166] RBP: ff1100000af7c000 R08: 1fe22000009b2fdf R09: ff1100000d7d0b58
[    8.424267][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[    8.424444][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000af7c000
[    8.424617][  T166] FS:  0000000028f8c400(0000) GS:ff110000a1153000(0000) knlGS:0000000000000000
[    8.424822][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.424973][  T166] CR2: 00007ff0d0ef8000 CR3: 000000000a14d002 CR4: 0000000000771ef0
[    8.425153][  T166] PKRU: 55555554
[    8.425241][  T166] Call Trace:
[    8.425327][  T166]  <TASK>
[    8.425387][  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))
[    8.425509][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.425627][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.425743][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.425830][  T166]  register_netdevice (net/core/dev.c:11488)
[    8.425947][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.426095][  T166]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    8.426212][  T166]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    8.426331][  T166]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    8.426450][  T166]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    8.426539][  T166]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    8.426654][  T166]  ? build_open_flags (fs/open.c:1212)
[    8.426780][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.426895][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    8.427011][  T166]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    8.427131][  T166]  ? fput_close_sync (fs/file_table.c:615)
[    8.427255][  T166]  ? __ia32_sys_open (fs/open.c:1374)
[    8.427378][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.427500][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.427616][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.427731][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.427846][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.427989][  T166] RIP: 0033:0x47cc8d
[    8.428086][  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 
[    8.428498][  T166] RSP: 002b:00007ffe67214410 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.428672][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.428846][  T166] RDX: 00007ffe67214490 RSI: 00000000400454ca RDI: 0000000000000005
[    8.429018][  T166] RBP: 00007ffe67214460 R08: 0000000000000000 R09: 0000000000000000
[    8.429196][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe67214968
[    8.429368][  T166] R13: 00007ffe672149f0 R14: 0000000000000002 R15: 0000000000543540
| [    8.430913][  T166] ------------[ cut here ]------------
| [    8.431026][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [    8.431259][  T166] Modules linked in:
| [    8.431665][  T166] Tainted: [W]=WARN
[    8.431751][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.431893][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.432042][  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
[    8.432591][  T166] RSP: 0018:ffa0000000857c58 EFLAGS: 00010286
[    8.432736][  T166] RAX: 00000000ffffffa6 RBX: ff11000004d97240 RCX: 1ff400000010af51
[    8.432906][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004d972f0
[    8.433079][  T166] RBP: ff1100000af7c000 R08: 1fe22000009b2e5f R09: ff1100000d7d0b58
[    8.433248][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
[    8.433416][  T166] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000003
[    8.433589][  T166] FS:  0000000028f8c400(0000) GS:ff110000a1153000(0000) knlGS:0000000000000000
[    8.433789][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.433932][  T166] CR2: 00007ff0d0ef8000 CR3: 000000000a14d002 CR4: 0000000000771ef0
[    8.434104][  T166] PKRU: 55555554
[    8.434188][  T166] Call Trace:
[    8.434273][  T166]  <TASK>
[    8.434331][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    8.434448][  T166]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    8.434563][  T166]  notifier_call_chain (kernel/notifier.c:85)
[    8.434680][  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)
[    8.434798][  T166]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    8.434945][  T166]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    8.435060][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.435183][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.435300][  T166]  ? update_socket_protocol+0x10/0x10
[    8.435415][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    8.435535][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.435649][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.435762][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.435876][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.435990][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.436133][  T166] RIP: 0033:0x47cc8d
[    8.436223][  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 
[    8.436631][  T166] RSP: 002b:00007ffe67214450 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.436802][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.436971][  T166] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    8.437147][  T166] RBP: 00007ffe672144a0 R08: 0000000000000000 R09: 0000000000000000
[    8.437315][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe67214968
[    8.437488][  T166] R13: 00007ffe672149f0 R14: 0000000000000002 R15: 0000000000543540
| [    8.439074][  T166] ------------[ cut here ]------------
| [    8.439194][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [    8.439430][  T166] Modules linked in:
| [    8.439802][  T166] Tainted: [W]=WARN
[    8.439894][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.440045][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.440294][  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
[    8.440815][  T166] RSP: 0018:ffa0000000857850 EFLAGS: 00010286
[    8.440967][  T166] RAX: 00000000ffffffa6 RBX: ff11000004d967c0 RCX: 1ff400000010aed0
[    8.441152][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004d96870
[    8.441413][  T166] RBP: ff1100000af7c000 R08: 1fe22000009b2d0f R09: ff1100000d7d0b58
[    8.441597][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000001
[    8.441777][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff110000057a0900
[    8.442038][  T166] FS:  0000000028f8c400(0000) GS:ff110000a1153000(0000) knlGS:0000000000000000
[    8.442258][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.442412][  T166] CR2: 00007ff0d0ef8000 CR3: 000000000a14d002 CR4: 0000000000771ef0
[    8.442675][  T166] PKRU: 55555554
[    8.442765][  T166] Call Trace:
[    8.442855][  T166]  <TASK>
[    8.442918][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.443122][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.443214][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    8.443336][  T166]  __dev_notify_flags (net/core/dev.c:9787)
[    8.443463][  T166]  ? netif_change_name (net/core/dev.c:1495)
[    8.443660][  T166]  ? __dev_change_flags (net/core/dev.c:9752)
[    8.443782][  T166]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    8.443903][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    8.444027][  T166]  netif_change_flags (net/core/dev.c:9820)
[    8.444230][  T166]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    8.444353][  T166]  dev_change_flags (net/core/dev_api.c:68)
[    8.444478][  T166]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    8.444603][  T166]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    8.444801][  T166]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    8.444926][  T166]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    8.445017][  T166]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    8.445143][  T166]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    8.445269][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.445473][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.445595][  T166]  sock_do_ioctl (net/socket.c:1313)
[    8.445718][  T166]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    8.445841][  T166]  ? ioctl_file_clone (fs/ioctl.c:244)
[    8.446042][  T166]  sock_ioctl (net/socket.c:1434)
[    8.446137][  T166]  ? br_ioctl_call (net/socket.c:1279)
[    8.446259][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.446382][  T166]  ? update_socket_protocol+0x10/0x10
[    8.446585][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    8.446708][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.446830][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.446951][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.447155][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.447276][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.447426][  T166] RIP: 0033:0x47cc8d
[    8.447526][  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 
[    8.448042][  T166] RSP: 002b:00007ffe67214430 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.448308][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.448494][  T166] RDX: 00007ffe672144a0 RSI: 0000000000008914 RDI: 0000000000000006
[    8.448675][  T166] RBP: 00007ffe67214480 R08: 0000000000000000 R09: 0000000000000000
[    8.448935][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe67214968
[    8.449124][  T166] R13: 00007ffe672149f0 R14: 0000000000000002 R15: 0000000000543540
| [   98.241195][  T166] ------------[ cut here ]------------
| [   98.241385][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [   98.241659][  T166] Modules linked in:
| [   98.242145][  T166] Tainted: [W]=WARN
[   98.242249][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.242414][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.242587][  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
[   98.243123][  T166] RSP: 0018:ffa00000008576f0 EFLAGS: 00010286
[   98.243293][  T166] RAX: 00000000ffffffa6 RBX: ff11000004c2c7c0 RCX: 1ff400000010aea4
[   98.243489][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004c2c870
[   98.243684][  T166] RBP: ff1100000af7c000 R08: 1fe220000098590f R09: ff1100000d7d0b58
[   98.243885][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000041
[   98.244137][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ffa0000000857790
[   98.244334][  T166] FS:  0000000000000000(0000) GS:ff110000a1153000(0000) knlGS:0000000000000000
[   98.244564][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.244730][  T166] CR2: 00005586fc637c70 CR3: 0000000034b39005 CR4: 0000000000771ef0
[   98.244926][  T166] PKRU: 55555554
[   98.245024][  T166] Call Trace:
[   98.245174][  T166]  <TASK>
[   98.245246][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   98.245378][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   98.245475][  T166]  netif_close_many (net/core/dev.c:1804)
[   98.245604][  T166]  ? asym_cpu_capacity_scan (./include/linux/rculist.h:103)
[   98.245737][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.245866][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.245993][  T166]  ? __dev_close_many (net/core/dev.c:1781)
[   98.246177][  T166]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   98.246337][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   98.246496][  T166]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   98.246626][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.246787][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.246915][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.247043][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.247223][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.247351][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.247477][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.247605][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.247738][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.247867][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.247994][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.248180][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.248308][  T166]  __fput (fs/file_table.c:510)
[   98.248407][  T166]  task_work_run (kernel/task_work.c:233)
[   98.248532][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.248657][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.248790][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.248918][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.249014][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.249196][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.249324][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.249448][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.249576][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.249701][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.249859][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.249985][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.250167][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.250293][  T166]  get_signal (kernel/signal.c:3037)
[   98.250422][  T166]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.250552][  T166]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.250679][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.250813][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.250942][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.251123][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.251251][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.251411][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.251536][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.251666][  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)
[   98.251796][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.251923][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.252133][  T166] RIP: 0033:0x4c2d9e
[   98.252237][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.252412][  T166] RSP: 002b:00007ffe67213dc0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.252604][  T166] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[   98.252796][  T166] RDX: 0000000000000014 RSI: 00007ffe67213ea0 RDI: 0000000000000007
[   98.252985][  T166] RBP: 00007ffe67213dd0 R08: 00007ffe67213e60 R09: 000000000000000c
[   98.253227][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000028f98780
[   98.253416][  T166] R13: 00007ffe672149f0 R14: 00007ffe67213f90 R15: 0000000000543540
| [   98.266706][  T166] ------------[ cut here ]------------
| [   98.266857][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [   98.267124][  T166] Modules linked in:
| [   98.267503][  T166] Tainted: [W]=WARN
[   98.267596][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.267753][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.267915][  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
[   98.268390][  T166] RSP: 0018:ffa0000000857820 EFLAGS: 00010286
[   98.268559][  T166] RAX: 00000000ffffffa6 RBX: ff11000004c2d6c0 RCX: 1ff400000010aeca
[   98.268760][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004c2d770
[   98.268965][  T166] RBP: ff1100000af7c000 R08: 1fe2200000985aef R09: ff1100000d7d0b58
[   98.269159][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[   98.269360][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.269544][  T166] FS:  0000000000000000(0000) GS:ff110000a1153000(0000) knlGS:0000000000000000
[   98.269765][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.269921][  T166] CR2: 00005586fc637c70 CR3: 0000000034b39005 CR4: 0000000000771ef0
[   98.270114][  T166] PKRU: 55555554
[   98.270206][  T166] Call Trace:
[   98.270298][  T166]  <TASK>
[   98.270362][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.270518][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.270672][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.270800][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.270923][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.271046][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.271181][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.271305][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.271426][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.271550][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.271672][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.271799][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.271924][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.272048][  T166]  __fput (fs/file_table.c:510)
[   98.272149][  T166]  task_work_run (kernel/task_work.c:233)
[   98.272270][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.272393][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.272516][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.272640][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.272737][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.272859][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.272982][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.273107][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.273231][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.273352][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.273504][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.273626][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.273751][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.273873][  T166]  get_signal (kernel/signal.c:3037)
[   98.273999][  T166]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.274125][  T166]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.274248][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.274373][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.274497][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.274622][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.274749][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.274902][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.275023][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.275151][  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)
[   98.275275][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.275397][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.275549][  T166] RIP: 0033:0x4c2d9e
[   98.275646][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.275807][  T166] RSP: 002b:00007ffe67213dc0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.275991][  T166] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[   98.276179][  T166] RDX: 0000000000000014 RSI: 00007ffe67213ea0 RDI: 0000000000000007
[   98.276359][  T166] RBP: 00007ffe67213dd0 R08: 00007ffe67213e60 R09: 000000000000000c
[   98.276540][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000028f98780
[   98.276722][  T166] R13: 00007ffe672149f0 R14: 00007ffe67213f90 R15: 0000000000543540
| [   98.294449][   T12] ------------[ cut here ]------------
| [   98.294656][   T12] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: 0/12
| [   98.294889][   T12] Modules linked in:
| [   98.295304][   T12] Tainted: [W]=WARN
[   98.295397][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.295556][   T12] Workqueue: netns cleanup_net
[   98.295684][   T12] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.295840][   T12] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   98.296251][   T12] RSP: 0018:ffa00000000c7878 EFLAGS: 00010286
[   98.296395][   T12] RAX: 00000000ffffffa6 RBX: ff11000004f1be40 RCX: 1ff4000000018ed5
[   98.296575][   T12] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004f1bef0
[   98.296756][   T12] RBP: ff11000009b81000 R08: 1fe22000009e37df R09: ff11000001afd1d0
[   98.296926][   T12] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   98.297104][   T12] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.297274][   T12] FS:  0000000000000000(0000) GS:ff110000a0fd3000(0000) knlGS:0000000000000000
[   98.297474][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.297618][   T12] CR2: 00007f91cd085f98 CR3: 0000000034b39006 CR4: 0000000000771ef0
[   98.297802][   T12] PKRU: 55555554
[   98.297897][   T12] Call Trace:
[   98.297984][   T12]  <TASK>
[   98.298048][   T12]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.298281][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.298425][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   98.298541][   T12]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   98.298655][   T12]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   98.298771][   T12]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   98.298887][   T12]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   98.299000][   T12]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   98.299163][   T12]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   98.299279][   T12]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   98.299393][   T12]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   98.299508][   T12]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.299625][   T12]  cleanup_net (net/core/net_namespace.c:702)
[   98.299749][   T12]  ? net_passive_dec (./include/linux/llist.h:241)
[   98.299863][   T12]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   98.299980][   T12]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   98.300141][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.300256][   T12]  process_one_work (kernel/workqueue.c:3314)
[   98.300372][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   98.300487][   T12]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.300606][   T12]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   98.300728][   T12]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.300842][   T12]  kthread (kernel/kthread.c:436)
[   98.300930][   T12]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.301121][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[   98.301236][   T12]  ret_from_fork (arch/x86/kernel/process.c:158)
[   98.301360][   T12]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   98.301502][   T12]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   98.301615][   T12]  ? kthread_affine_node (kernel/kthread.c:378)


Finger prints:
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:register_netdevice:register_netdev:loopback_net_init
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:register_netdevice:__tun_chr_ioctl:__x64_sys_ioctl
rtmsg_ifinfo_build_skb:unregister_netdevice_many_notify:unregister_netdevice_queue:__tun_detach:tun_chr_close
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:netif_close_many:unregister_netdevice_many_notify:unregister_netdevice_queue
rtmsg_ifinfo_build_skb:rtnetlink_event:notifier_call_chain:netdev_update_features:__tun_chr_ioctl
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:__dev_notify_flags:netif_change_flags:dev_change_flags
rtmsg_ifinfo_build_skb:unregister_netdevice_many_notify:default_device_exit_batch:ops_undo_list:cleanup_net