======================================
| xx__-> [    8.992855][  T167] ------------[ cut here ]------------
| [    8.993107][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: unshare/167
| [    8.993401][  T167] Modules linked in:
| [    8.993864][  T167] Tainted: [W]=WARN
[    8.993968][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.994147][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.994329][  T167] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    8.994866][  T167] RSP: 0018:ffa00000007e7ab0 EFLAGS: 00010286
[    8.995050][  T167] RAX: 00000000ffffffa6 RBX: ff11000005726c40 RCX: 1ff40000000fcf1c
[    8.995257][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000005726cf0
[    8.995464][  T167] RBP: ff11000008834000 R08: 1fe2200000ae4d9f R09: ff1100000d58ae80
[    8.995705][  T167] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[    8.995925][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000008834000
[    8.996144][  T167] FS:  00007f210e56e740(0000) GS:ff1100007b353000(0000) knlGS:0000000000000000
[    8.996447][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.996736][  T167] CR2: 0000564b3188f310 CR3: 000000000c838001 CR4: 0000000000771ef0
[    8.996945][  T167] PKRU: 55555554
[    8.997057][  T167] Call Trace:
[    8.997161][  T167]  <TASK>
[    8.997234][  T167]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    8.997384][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.997533][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.997676][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.997781][  T167]  register_netdevice (net/core/dev.c:11488)
[    8.997918][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.998098][  T167]  register_netdev (net/core/dev.c:11552)
[    8.998237][  T167]  loopback_net_init (drivers/net/loopback.c:218)
[    8.998378][  T167]  ops_init (net/core/net_namespace.c:137)
[    8.998491][  T167]  setup_net (net/core/net_namespace.c:446)
[    8.998602][  T167]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    8.998740][  T167]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    8.998877][  T167]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    8.999022][  T167]  copy_net_ns (net/core/net_namespace.c:579)
[    8.999162][  T167]  create_new_namespaces (kernel/nsproxy.c:132)
[    8.999303][  T167]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    8.999440][  T167]  ksys_unshare (kernel/fork.c:3243)
[    8.999592][  T167]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    8.999734][  T167]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    8.999873][  T167]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    9.000013][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.000157][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.000296][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.000433][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.000615][  T167] RIP: 0033:0x7f210e669bcb
[    9.000759][  T167] Code: 73 01 c3 48 8b 0d 2d 82 0f 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d fd 81 0f 00 f7 d8 64 89 01 48
All code
========
   0:	73 01                	jae    0x3
   2:	c3                   	ret
   3:	48 8b 0d 2d 82 0f 00 	mov    0xf822d(%rip),%rcx        # 0xf8237
   a:	f7 d8                	neg    %eax
   c:	64 89 01             	mov    %eax,%fs:(%rcx)
   f:	48 83 c8 ff          	or     $0xffffffffffffffff,%rax
  13:	c3                   	ret
  14:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  1b:	00 00 00 
  1e:	90                   	nop
  1f:	f3 0f 1e fa          	endbr64
  23:	b8 10 01 00 00       	mov    $0x110,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax		<-- trapping instruction
  30:	73 01                	jae    0x33
  32:	c3                   	ret
  33:	48 8b 0d fd 81 0f 00 	mov    0xf81fd(%rip),%rcx        # 0xf8237
  3a:	f7 d8                	neg    %eax
  3c:	64 89 01             	mov    %eax,%fs:(%rcx)
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax
   6:	73 01                	jae    0x9
   8:	c3                   	ret
   9:	48 8b 0d fd 81 0f 00 	mov    0xf81fd(%rip),%rcx        # 0xf820d
  10:	f7 d8                	neg    %eax
  12:	64 89 01             	mov    %eax,%fs:(%rcx)
  15:	48                   	rex.W
[    9.001259][  T167] RSP: 002b:00007ffe6ddbfbf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    9.001466][  T167] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f210e669bcb
[    9.001686][  T167] RDX: 0000000000000000 RSI: 00007ffe6ddbf960 RDI: 0000000040000000
[    9.001892][  T167] RBP: 00007ffe6ddbff80 R08: 00007ffe6ddbfb50 R09: 0000000000000000
[    9.002098][  T167] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    9.002307][  T167] R13: 0000000000000000 R14: 00000000ffffffff R15: 0000564b31892b68
| [    9.021283][  T167] ------------[ cut here ]------------
| [    9.021462][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/167
| [    9.021727][  T167] Modules linked in:
| [    9.022123][  T167] Tainted: [W]=WARN
[    9.022219][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.022391][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.022565][  T167] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    9.023045][  T167] RSP: 0018:ffa00000007e7b58 EFLAGS: 00010286
[    9.023206][  T167] RAX: 00000000ffffffa6 RBX: ff11000009fe87c0 RCX: 1ff40000000fcf31
[    9.023396][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009fe8870
[    9.023590][  T167] RBP: ff1100000c5e8000 R08: 1fe22000013fd10f R09: ff1100000d58ae58
[    9.023782][  T167] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[    9.023977][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000c5e8000
[    9.024185][  T167] FS:  0000000001907400(0000) GS:ff1100007b353000(0000) knlGS:0000000000000000
[    9.024413][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.024724][  T167] CR2: 00007f69d546c000 CR3: 000000000c833002 CR4: 0000000000771ef0
[    9.024927][  T167] PKRU: 55555554
[    9.025028][  T167] Call Trace:
[    9.025126][  T167]  <TASK>
[    9.025199][  T167]  ? ip6_route_dev_notify (./include/net/net_namespace.h:419 (discriminator 1) ./include/linux/netdevice.h:2776 (discriminator 1) net/ipv6/route.c:6476 (discriminator 1))
[    9.025328][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.025454][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[    9.025591][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.025694][  T167]  register_netdevice (net/core/dev.c:11488)
[    9.025830][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    9.025988][  T167]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    9.026122][  T167]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    9.026252][  T167]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    9.026379][  T167]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    9.026476][  T167]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    9.026774][  T167]  ? build_open_flags (fs/open.c:1212)
[    9.026903][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    9.027033][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    9.027171][  T167]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    9.027301][  T167]  ? fput_close_sync (fs/file_table.c:615)
[    9.027427][  T167]  ? __ia32_sys_open (fs/open.c:1374)
[    9.027564][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.027692][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.027833][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.027960][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.028113][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.028279][  T167] RIP: 0033:0x47cc8d
[    9.028390][  T167] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[    9.028844][  T167] RSP: 002b:00007ffef68dbaa0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.029042][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.029230][  T167] RDX: 00007ffef68dbb20 RSI: 00000000400454ca RDI: 0000000000000005
[    9.029418][  T167] RBP: 00007ffef68dbaf0 R08: 0000000000000000 R09: 0000000000000000
[    9.029621][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffef68dbff8
[    9.029809][  T167] R13: 00007ffef68dc080 R14: 0000000000000002 R15: 0000000000543540
| [    9.037637][  T167] ------------[ cut here ]------------
| [    9.037792][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/167
| [    9.038041][  T167] Modules linked in:
| [    9.038448][  T167] Tainted: [W]=WARN
[    9.038556][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.038723][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.038888][  T167] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    9.039335][  T167] RSP: 0018:ffa00000007e7c58 EFLAGS: 00010286
[    9.039508][  T167] RAX: 00000000ffffffa6 RBX: ff11000009fe8f40 RCX: 1ff40000000fcf51
[    9.039702][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009fe8ff0
[    9.039887][  T167] RBP: ff1100000c5e8000 R08: 1fe22000013fd1ff R09: ff1100000d58ae58
[    9.040081][  T167] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
[    9.040268][  T167] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000003
[    9.040453][  T167] FS:  0000000001907400(0000) GS:ff1100007b353000(0000) knlGS:0000000000000000
[    9.040678][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.040836][  T167] CR2: 00007f69d546c000 CR3: 000000000c833002 CR4: 0000000000771ef0
[    9.041030][  T167] PKRU: 55555554
[    9.041138][  T167] Call Trace:
[    9.041234][  T167]  <TASK>
[    9.041312][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    9.041442][  T167]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    9.041582][  T167]  notifier_call_chain (kernel/notifier.c:85)
[    9.041716][  T167]  netdev_update_features (net/core/dev.c:2287 net/core/dev.c:2301 net/core/dev.c:1590 net/core/dev.c:11099 net/core/dev.c:11096)
[    9.041847][  T167]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    9.042005][  T167]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    9.042138][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    9.042277][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    9.042406][  T167]  ? update_socket_protocol+0x10/0x10
[    9.042544][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[    9.042670][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.042796][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.042918][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.043051][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.043176][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.043330][  T167] RIP: 0033:0x47cc8d
[    9.043429][  T167] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[    9.043909][  T167] RSP: 002b:00007ffef68dbae0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.044103][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.044289][  T167] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    9.044588][  T167] RBP: 00007ffef68dbb30 R08: 0000000000000005 R09: 0000000000001ff0
[    9.044786][  T167] R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffef68dbff8
[    9.044975][  T167] R13: 00007ffef68dc080 R14: 0000000000000002 R15: 0000000000543540
| [    9.047026][  T167] ------------[ cut here ]------------
| [    9.047160][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/167
| [    9.047419][  T167] Modules linked in:
| [    9.047896][  T167] Tainted: [W]=WARN
[    9.047995][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.048254][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.048425][  T167] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    9.048991][  T167] RSP: 0018:ffa00000007e7850 EFLAGS: 00010286
[    9.049162][  T167] RAX: 00000000ffffffa6 RBX: ff11000009fe9540 RCX: 1ff40000000fced0
[    9.049359][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009fe95f0
[    9.049675][  T167] RBP: ff1100000c5e8000 R08: 1fe22000013fd2bf R09: ff1100000d58ae58
[    9.049878][  T167] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000001
[    9.050171][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000005798900
[    9.050368][  T167] FS:  0000000001907400(0000) GS:ff1100007b353000(0000) knlGS:0000000000000000
[    9.050644][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.050926][  T167] CR2: 00007f69d546c000 CR3: 000000000c833002 CR4: 0000000000771ef0
[    9.051128][  T167] PKRU: 55555554
[    9.051226][  T167] Call Trace:
[    9.051325][  T167]  <TASK>
[    9.051484][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.051623][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.051724][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    9.051855][  T167]  __dev_notify_flags (net/core/dev.c:9787)
[    9.052079][  T167]  ? netif_change_name (net/core/dev.c:1495)
[    9.052209][  T167]  ? __dev_change_flags (net/core/dev.c:9752)
[    9.052339][  T167]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    9.052471][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    9.052700][  T167]  netif_change_flags (net/core/dev.c:9820)
[    9.052832][  T167]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    9.052964][  T167]  dev_change_flags (net/core/dev_api.c:68)
[    9.053099][  T167]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    9.053320][  T167]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    9.053451][  T167]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    9.053597][  T167]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    9.053698][  T167]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    9.053830][  T167]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    9.054059][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    9.054194][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    9.054327][  T167]  sock_do_ioctl (net/socket.c:1313)
[    9.054460][  T167]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    9.054604][  T167]  ? ioctl_file_clone (fs/ioctl.c:244)
[    9.054739][  T167]  sock_ioctl (net/socket.c:1434)
[    9.054841][  T167]  ? br_ioctl_call (net/socket.c:1279)
[    9.054985][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    9.055226][  T167]  ? update_socket_protocol+0x10/0x10
[    9.055370][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[    9.055516][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.055648][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.055867][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.056013][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.056151][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.056312][  T167] RIP: 0033:0x47cc8d
[    9.056518][  T167] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[    9.057083][  T167] RSP: 002b:00007ffef68dbac0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.057281][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.057476][  T167] RDX: 00007ffef68dbb30 RSI: 0000000000008914 RDI: 0000000000000006
[    9.057772][  T167] RBP: 00007ffef68dbb10 R08: 0000000000000005 R09: 0000000000001ff0
[    9.057968][  T167] R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffef68dbff8
[    9.058172][  T167] R13: 00007ffef68dc080 R14: 0000000000000002 R15: 0000000000543540
| [   98.830729][  T167] ------------[ cut here ]------------
| [   98.830921][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/167
| [   98.831206][  T167] Modules linked in:
| [   98.832425][  T167] Tainted: [W]=WARN
[   98.832632][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.832850][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.833037][  T167] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   98.833629][  T167] RSP: 0018:ffa00000007e76f0 EFLAGS: 00010286
[   98.833811][  T167] RAX: 00000000ffffffa6 RBX: ff1100000b0399c0 RCX: 1ff40000000fcea4
[   98.834021][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000b039a70
[   98.834228][  T167] RBP: ff1100000c5e8000 R08: 1fe220000160734f R09: ff1100000d58ae58
[   98.834461][  T167] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000041
[   98.834749][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ffa00000007e7790
[   98.834987][  T167] FS:  0000000000000000(0000) GS:ff1100007b353000(0000) knlGS:0000000000000000
[   98.835337][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.835579][  T167] CR2: 00007f69d546c000 CR3: 000000002f339006 CR4: 0000000000771ef0
[   98.835792][  T167] PKRU: 55555554
[   98.835896][  T167] Call Trace:
[   98.836003][  T167]  <TASK>
[   98.836079][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   98.836222][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   98.836337][  T167]  netif_close_many (net/core/dev.c:1804)
[   98.836477][  T167]  ? finish_task_switch.isra.0 (kernel/sched/sched.h:1644 kernel/sched/core.c:5125 kernel/sched/core.c:5243)
[   98.836733][  T167]  ? finish_task_switch.isra.0 (kernel/sched/sched.h:1644 kernel/sched/core.c:5125 kernel/sched/core.c:5243)
[   98.836910][  T167]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   98.837052][  T167]  ? __dev_close_many (net/core/dev.c:1781)
[   98.837191][  T167]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   98.837370][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   98.837554][  T167]  ? preempt_schedule_notrace_thunk (arch/x86/entry/thunk.S:13)
[   98.837738][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.837927][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.838068][  T167]  ? irqentry_exit (./include/linux/irq-entry-common.h:507 ./include/linux/irq-entry-common.h:542 kernel/entry/common.c:164)
[   98.838210][  T167]  ? irqentry_exit (./include/linux/irq-entry-common.h:507 ./include/linux/irq-entry-common.h:542 kernel/entry/common.c:164)
[   98.838353][  T167]  ? lockdep_hardirqs_off (kernel/locking/lockdep.c:4511)
[   98.838495][  T167]  ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1061 (discriminator 37) arch/x86/kernel/apic/apic.c:1061 (discriminator 37))
[   98.838687][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.838849][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.838997][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.839134][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2618)
[   98.839282][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.839425][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.839571][  T167]  __fput (fs/file_table.c:510)
[   98.839681][  T167]  task_work_run (kernel/task_work.c:233)
[   98.839825][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.839964][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[   98.840105][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.840254][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.840362][  T167]  ? exit_notify (kernel/exit.c:748)
[   98.840508][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.840653][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.840793][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.840935][  T167]  do_group_exit (kernel/exit.c:1119)
[   98.841075][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.841254][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.841492][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.841644][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.841787][  T167]  get_signal (kernel/signal.c:3037)
[   98.841931][  T167]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.842072][  T167]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.842214][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[   98.842377][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.842529][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.842675][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.842821][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.842961][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.843152][  T167]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.843297][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.843438][  T167]  do_syscall_64 (./include/linux/irq-entry-common.h:207 ./include/linux/irq-entry-common.h:230 ./include/linux/entry-common.h:318 arch/x86/entry/syscall_64.c:100)
[   98.843592][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.843737][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.843915][  T167] RIP: 0033:0x4c2d9e
[   98.844029][  T167] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.844223][  T167] RSP: 002b:00007ffef68db450 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.844438][  T167] RAX: 0000000000000014 RBX: 0000000000000012 RCX: 00000000004c2d9e
[   98.844655][  T167] RDX: 0000000000000014 RSI: 00007ffef68db530 RDI: 0000000000000007
[   98.844879][  T167] RBP: 00007ffef68db460 R08: 00007ffef68db4f0 R09: 000000000000000c
[   98.845091][  T167] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffef68dbff8
[   98.845319][  T167] R13: 00007ffef68dc080 R14: 00007ffef68db620 R15: 0000000000543540
| [   98.850453][  T167] ------------[ cut here ]------------
| [   98.850706][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/167
| [   98.850975][  T167] Modules linked in:
| [   98.851391][  T167] Tainted: [W]=WARN
[   98.851547][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.851725][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.851899][  T167] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   98.852400][  T167] RSP: 0018:ffa00000007e7820 EFLAGS: 00010286
[   98.852631][  T167] RAX: 00000000ffffffa6 RBX: ff1100000268f540 RCX: 1ff40000000fceca
[   98.852839][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000268f5f0
[   98.853043][  T167] RBP: ff1100000c5e8000 R08: 1fe22000004d1ebf R09: ff1100000d58ae58
[   98.853248][  T167] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[   98.853449][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.853709][  T167] FS:  0000000000000000(0000) GS:ff1100007b353000(0000) knlGS:0000000000000000
[   98.853944][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.854114][  T167] CR2: 00007f69d546c000 CR3: 000000002f339006 CR4: 0000000000771ef0
[   98.854324][  T167] PKRU: 55555554
[   98.854426][  T167] Call Trace:
[   98.854585][  T167]  <TASK>
[   98.854655][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.854828][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.855010][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.855146][  T167]  ? irqentry_exit (./include/linux/irq-entry-common.h:507 ./include/linux/irq-entry-common.h:542 kernel/entry/common.c:164)
[   98.855284][  T167]  ? irqentry_exit (./include/linux/irq-entry-common.h:507 ./include/linux/irq-entry-common.h:542 kernel/entry/common.c:164)
[   98.855428][  T167]  ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1061 (discriminator 37) arch/x86/kernel/apic/apic.c:1061 (discriminator 37))
[   98.855652][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.855787][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.855922][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.856055][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2618)
[   98.856190][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.856351][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.856539][  T167]  __fput (fs/file_table.c:510)
[   98.856648][  T167]  task_work_run (kernel/task_work.c:233)
[   98.856782][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.856917][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[   98.857050][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.857185][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.857290][  T167]  ? exit_notify (kernel/exit.c:748)
[   98.857425][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.857618][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.857753][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.857894][  T167]  do_group_exit (kernel/exit.c:1119)
[   98.858028][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.858220][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.858364][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.858549][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.858689][  T167]  get_signal (kernel/signal.c:3037)
[   98.858827][  T167]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.858962][  T167]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.859100][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[   98.859237][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.859380][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.859576][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.859713][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.859851][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.860020][  T167]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.860154][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.860295][  T167]  do_syscall_64 (./include/linux/irq-entry-common.h:207 ./include/linux/irq-entry-common.h:230 ./include/linux/entry-common.h:318 arch/x86/entry/syscall_64.c:100)
[   98.860435][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.860652][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.860832][  T167] RIP: 0033:0x4c2d9e
[   98.860938][  T167] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.861110][  T167] RSP: 002b:00007ffef68db450 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.861323][  T167] RAX: 0000000000000014 RBX: 0000000000000012 RCX: 00000000004c2d9e
[   98.861583][  T167] RDX: 0000000000000014 RSI: 00007ffef68db530 RDI: 0000000000000007
[   98.861799][  T167] RBP: 00007ffef68db460 R08: 00007ffef68db4f0 R09: 000000000000000c
[   98.861998][  T167] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffef68dbff8
[   98.862197][  T167] R13: 00007ffef68dc080 R14: 00007ffef68db620 R15: 0000000000543540
| [   98.887828][   T68] ------------[ cut here ]------------
| [   98.888041][   T68] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: 1/68
| [   98.888341][   T68] Modules linked in:
| [   98.888806][   T68] Tainted: [W]=WARN
[   98.888902][   T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.889063][   T68] Workqueue: netns cleanup_net
[   98.889203][   T68] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.889371][   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
[   98.889833][   T68] RSP: 0018:ffa0000000497878 EFLAGS: 00010286
[   98.889991][   T68] RAX: 00000000ffffffa6 RBX: ff1100000268fe40 RCX: 1ff4000000092ed5
[   98.890184][   T68] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000268fef0
[   98.890374][   T68] RBP: ff11000008834000 R08: 1fe22000004d1fdf R09: ff11000008ccaed0
[   98.890567][   T68] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   98.890776][   T68] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.890973][   T68] FS:  0000000000000000(0000) GS:ff1100007b1d3000(0000) knlGS:0000000000000000
[   98.891191][   T68] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.891353][   T68] CR2: 000055638609a2b8 CR3: 000000000a9c7005 CR4: 0000000000771ef0
[   98.891545][   T68] PKRU: 55555554
[   98.891645][   T68] Call Trace:
[   98.891760][   T68]  <TASK>
[   98.891831][   T68]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.891999][   T68]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.892170][   T68]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   98.892302][   T68]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   98.892425][   T68]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   98.892553][   T68]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   98.892684][   T68]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   98.892810][   T68]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   98.892933][   T68]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   98.893059][   T68]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   98.893187][   T68]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   98.893326][   T68]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.893455][   T68]  cleanup_net (net/core/net_namespace.c:702)
[   98.893681][   T68]  ? net_passive_dec (./include/linux/llist.h:241)
[   98.893808][   T68]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   98.893935][   T68]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   98.894059][   T68]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.894234][   T68]  process_one_work (kernel/workqueue.c:3314)
[   98.894394][   T68]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   98.894573][   T68]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.894705][   T68]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   98.894832][   T68]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.894963][   T68]  ? __kthread_parkme (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 kernel/kthread.c:272)
[   98.895090][   T68]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.895213][   T68]  kthread (kernel/kthread.c:436)
[   98.895330][   T68]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.895536][   T68]  ? kthread_affine_node (kernel/kthread.c:378)
[   98.895665][   T68]  ret_from_fork (arch/x86/kernel/process.c:158)
[   98.895792][   T68]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   98.895949][   T68]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   98.896080][   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