======================================
| xx__-> [    8.741389][  T167] ------------[ cut here ]------------
| [    8.741606][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: unshare/167
| [    8.741892][  T167] Modules linked in:
| [    8.742369][  T167] Tainted: [W]=WARN
[    8.742472][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.742646][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.742826][  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
[    8.743347][  T167] RSP: 0018:ffa0000000787ab0 EFLAGS: 00010286
[    8.743521][  T167] RAX: 00000000ffffffa6 RBX: ff110000055939c0 RCX: 1ff40000000f0f1c
[    8.743727][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000005593a70
[    8.743938][  T167] RBP: ff11000008969000 R08: 1fe2200000ab274f R09: ff110000136d2e80
[    8.744150][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[    8.744354][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000008969000
[    8.744560][  T167] FS:  00007f808df17740(0000) GS:ff110000875d3000(0000) knlGS:0000000000000000
[    8.744801][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.744998][  T167] CR2: 000055ae73456310 CR3: 00000000143c5002 CR4: 0000000000771ef0
[    8.745208][  T167] PKRU: 55555554
[    8.745311][  T167] Call Trace:
[    8.745414][  T167]  <TASK>
[    8.745487][  T167]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    8.745625][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.745761][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.745904][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.746026][  T167]  register_netdevice (net/core/dev.c:11488)
[    8.746165][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.746336][  T167]  register_netdev (net/core/dev.c:11552)
[    8.746471][  T167]  loopback_net_init (drivers/net/loopback.c:218)
[    8.746609][  T167]  ops_init (net/core/net_namespace.c:137)
[    8.746713][  T167]  setup_net (net/core/net_namespace.c:446)
[    8.746817][  T167]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    8.746958][  T167]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    8.747101][  T167]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    8.747238][  T167]  copy_net_ns (net/core/net_namespace.c:579)
[    8.747375][  T167]  create_new_namespaces (kernel/nsproxy.c:132)
[    8.747512][  T167]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    8.747647][  T167]  ksys_unshare (kernel/fork.c:3243)
[    8.747784][  T167]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    8.747930][  T167]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    8.748070][  T167]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    8.748207][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.748341][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.748478][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.748613][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.748781][  T167] RIP: 0033:0x7f808e012bcb
[    8.748927][  T167] Code: 73 01 c3 48 8b 0d 2d 82 0f 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d fd 81 0f 00 f7 d8 64 89 01 48
All code
========
   0:	73 01                	jae    0x3
   2:	c3                   	ret
   3:	48 8b 0d 2d 82 0f 00 	mov    0xf822d(%rip),%rcx        # 0xf8237
   a:	f7 d8                	neg    %eax
   c:	64 89 01             	mov    %eax,%fs:(%rcx)
   f:	48 83 c8 ff          	or     $0xffffffffffffffff,%rax
  13:	c3                   	ret
  14:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  1b:	00 00 00 
  1e:	90                   	nop
  1f:	f3 0f 1e fa          	endbr64
  23:	b8 10 01 00 00       	mov    $0x110,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax		<-- trapping instruction
  30:	73 01                	jae    0x33
  32:	c3                   	ret
  33:	48 8b 0d fd 81 0f 00 	mov    0xf81fd(%rip),%rcx        # 0xf8237
  3a:	f7 d8                	neg    %eax
  3c:	64 89 01             	mov    %eax,%fs:(%rcx)
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax
   6:	73 01                	jae    0x9
   8:	c3                   	ret
   9:	48 8b 0d fd 81 0f 00 	mov    0xf81fd(%rip),%rcx        # 0xf820d
  10:	f7 d8                	neg    %eax
  12:	64 89 01             	mov    %eax,%fs:(%rcx)
  15:	48                   	rex.W
[    8.749411][  T167] RSP: 002b:00007fffc063e778 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    8.749625][  T167] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f808e012bcb
[    8.749827][  T167] RDX: 0000000000000000 RSI: 00007fffc063e4e0 RDI: 0000000040000000
[    8.750043][  T167] RBP: 00007fffc063eb00 R08: 00007fffc063e6d0 R09: 0000000000000000
[    8.750245][  T167] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    8.750448][  T167] R13: 0000000000000000 R14: 00000000ffffffff R15: 000055ae73459b68
| [    8.775216][  T167] ------------[ cut here ]------------
| [    8.775375][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [    8.775628][  T167] Modules linked in:
| [    8.776026][  T167] Tainted: [W]=WARN
[    8.776122][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.776280][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.776441][  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
[    8.776885][  T167] RSP: 0018:ffa0000000787b58 EFLAGS: 00010286
[    8.777047][  T167] RAX: 00000000ffffffa6 RBX: ff11000009bb6dc0 RCX: 1ff40000000f0f31
[    8.777233][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009bb6e70
[    8.777416][  T167] RBP: ff11000011f40000 R08: 1fe2200001376dcf R09: ff110000136d2e58
[    8.777605][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[    8.777790][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000011f40000
[    8.777981][  T167] FS:  0000000031c1e400(0000) GS:ff110000875d3000(0000) knlGS:0000000000000000
[    8.778207][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.778363][  T167] CR2: 00007f6842a70000 CR3: 0000000004b98003 CR4: 0000000000771ef0
[    8.778549][  T167] PKRU: 55555554
[    8.778642][  T167] Call Trace:
[    8.778736][  T167]  <TASK>
[    8.778803][  T167]  ? ip6_route_dev_notify (./include/net/net_namespace.h:419 (discriminator 1) ./include/linux/netdevice.h:2776 (discriminator 1) net/ipv6/route.c:6476 (discriminator 1))
[    8.778932][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.779062][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.779188][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.779281][  T167]  register_netdevice (net/core/dev.c:11488)
[    8.779408][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.779563][  T167]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    8.779692][  T167]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    8.779819][  T167]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    8.779948][  T167]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    8.780049][  T167]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    8.780171][  T167]  ? build_open_flags (fs/open.c:1212)
[    8.780297][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.780421][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    8.780550][  T167]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    8.780672][  T167]  ? fput_close_sync (fs/file_table.c:615)
[    8.780796][  T167]  ? __ia32_sys_open (fs/open.c:1374)
[    8.780927][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.781058][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.781182][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.781307][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.781431][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.781587][  T167] RIP: 0033:0x47cc8d
[    8.781686][  T167] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[    8.782131][  T167] RSP: 002b:00007ffc7643c090 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.782317][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.782502][  T167] RDX: 00007ffc7643c110 RSI: 00000000400454ca RDI: 0000000000000005
[    8.782688][  T167] RBP: 00007ffc7643c0e0 R08: 0000000000000000 R09: 0000000000000000
[    8.782873][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc7643c5e8
[    8.783068][  T167] R13: 00007ffc7643c670 R14: 0000000000000002 R15: 0000000000543540
| [    8.784733][  T167] ------------[ cut here ]------------
| [    8.784855][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [    8.785106][  T167] Modules linked in:
| [    8.785478][  T167] Tainted: [W]=WARN
[    8.785572][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.785725][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.785887][  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
[    8.786328][  T167] RSP: 0018:ffa0000000787c58 EFLAGS: 00010286
[    8.786483][  T167] RAX: 00000000ffffffa6 RBX: ff11000009bb67c0 RCX: 1ff40000000f0f51
[    8.786670][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009bb6870
[    8.786854][  T167] RBP: ff11000011f40000 R08: 1fe2200001376d0f R09: ff110000136d2e58
[    8.787048][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[    8.787229][  T167] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
[    8.787413][  T167] FS:  0000000031c1e400(0000) GS:ff110000875d3000(0000) knlGS:0000000000000000
[    8.787627][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.787786][  T167] CR2: 00007f6842a70000 CR3: 0000000004b98003 CR4: 0000000000771ef0
[    8.787975][  T167] PKRU: 55555554
[    8.788072][  T167] Call Trace:
[    8.788163][  T167]  <TASK>
[    8.788227][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    8.788353][  T167]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    8.788476][  T167]  notifier_call_chain (kernel/notifier.c:85)
[    8.788602][  T167]  netdev_update_features (net/core/dev.c:2287 net/core/dev.c:2301 net/core/dev.c:1590 net/core/dev.c:11099 net/core/dev.c:11096)
[    8.788726][  T167]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    8.788886][  T167]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    8.789018][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.789145][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.789273][  T167]  ? update_socket_protocol+0x10/0x10
[    8.789399][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[    8.789525][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.789651][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.789778][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.789907][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.790035][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.790190][  T167] RIP: 0033:0x47cc8d
[    8.790290][  T167] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[    8.790731][  T167] RSP: 002b:00007ffc7643c0d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.790922][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.791114][  T167] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    8.791301][  T167] RBP: 00007ffc7643c120 R08: 0000000000000000 R09: 0000000000000000
[    8.791488][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc7643c5e8
[    8.791670][  T167] R13: 00007ffc7643c670 R14: 0000000000000002 R15: 0000000000543540
| [    8.793396][  T167] ------------[ cut here ]------------
| [    8.793526][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [    8.793782][  T167] Modules linked in:
| [    8.794191][  T167] Tainted: [W]=WARN
[    8.794292][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.794455][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.794625][  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
[    8.795104][  T167] RSP: 0018:ffa0000000787850 EFLAGS: 00010286
[    8.795270][  T167] RAX: 00000000ffffffa6 RBX: ff11000009bb6ac0 RCX: 1ff40000000f0ed0
[    8.795466][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009bb6b70
[    8.795664][  T167] RBP: ff11000011f40000 R08: 1fe2200001376d6f R09: ff110000136d2e58
[    8.795859][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
[    8.796062][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff110000057a0900
[    8.796260][  T167] FS:  0000000031c1e400(0000) GS:ff110000875d3000(0000) knlGS:0000000000000000
[    8.796493][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.796659][  T167] CR2: 00007f6842a70000 CR3: 0000000004b98003 CR4: 0000000000771ef0
[    8.796855][  T167] PKRU: 55555554
[    8.796956][  T167] Call Trace:
[    8.797059][  T167]  <TASK>
[    8.797127][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.797261][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.797365][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    8.797498][  T167]  __dev_notify_flags (net/core/dev.c:9787)
[    8.797629][  T167]  ? netif_change_name (net/core/dev.c:1495)
[    8.797761][  T167]  ? __dev_change_flags (net/core/dev.c:9752)
[    8.797898][  T167]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    8.798040][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    8.798175][  T167]  netif_change_flags (net/core/dev.c:9820)
[    8.798309][  T167]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    8.798443][  T167]  dev_change_flags (net/core/dev_api.c:68)
[    8.798576][  T167]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    8.798710][  T167]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    8.798842][  T167]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    8.798980][  T167]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    8.799087][  T167]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    8.799218][  T167]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    8.799356][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.799492][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.799625][  T167]  sock_do_ioctl (net/socket.c:1313)
[    8.799758][  T167]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    8.799905][  T167]  ? ioctl_file_clone (fs/ioctl.c:244)
[    8.800046][  T167]  sock_ioctl (net/socket.c:1434)
[    8.800147][  T167]  ? br_ioctl_call (net/socket.c:1279)
[    8.800279][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.800414][  T167]  ? update_socket_protocol+0x10/0x10
[    8.800548][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[    8.800683][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.800815][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.800951][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.801087][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.801218][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.801380][  T167] RIP: 0033:0x47cc8d
[    8.801486][  T167] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[    8.802055][  T167] RSP: 002b:00007ffc7643c0b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.802252][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.802533][  T167] RDX: 00007ffc7643c120 RSI: 0000000000008914 RDI: 0000000000000006
[    8.802728][  T167] RBP: 00007ffc7643c100 R08: 0000000000000000 R09: 0000000000000000
[    8.803016][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc7643c5e8
[    8.803214][  T167] R13: 00007ffc7643c670 R14: 0000000000000002 R15: 0000000000543540
| [   98.582969][  T167] ------------[ cut here ]------------
| [   98.583182][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [   98.583458][  T167] Modules linked in:
| [   98.583875][  T167] Tainted: [W]=WARN
[   98.583977][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.584206][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.584388][  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
[   98.584861][  T167] RSP: 0018:ffa00000007876f0 EFLAGS: 00010286
[   98.585129][  T167] RAX: 00000000ffffffa6 RBX: ff110000141664c0 RCX: 1ff40000000f0ea4
[   98.585334][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000014166570
[   98.585535][  T167] RBP: ff11000011f40000 R08: 1fe220000282ccaf R09: ff110000136d2e58
[   98.585732][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000041
[   98.585929][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ffa0000000787790
[   98.586230][  T167] FS:  0000000000000000(0000) GS:ff110000875d3000(0000) knlGS:0000000000000000
[   98.586466][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.586634][  T167] CR2: 000055b24e0d1c30 CR3: 00000000137f3002 CR4: 0000000000771ef0
[   98.586835][  T167] PKRU: 55555554
[   98.586938][  T167] Call Trace:
[   98.587093][  T167]  <TASK>
[   98.587164][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   98.587312][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   98.587413][  T167]  netif_close_many (net/core/dev.c:1804)
[   98.587549][  T167]  ? asym_cpu_capacity_scan (./include/linux/rculist.h:103)
[   98.587687][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.587821][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.587953][  T167]  ? __dev_close_many (net/core/dev.c:1781)
[   98.588178][  T167]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   98.588352][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   98.588522][  T167]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   98.588656][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.588821][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.588955][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.589179][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.589320][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.589454][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.589588][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.589721][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.589854][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.589990][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.590181][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.590322][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.590455][  T167]  __fput (fs/file_table.c:510)
[   98.590559][  T167]  task_work_run (kernel/task_work.c:233)
[   98.590692][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.590825][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[   98.590960][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.591188][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.591293][  T167]  ? exit_notify (kernel/exit.c:748)
[   98.591424][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.591557][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.591691][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.591825][  T167]  do_group_exit (kernel/exit.c:1119)
[   98.591959][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.592213][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.592351][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.592484][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.592618][  T167]  get_signal (kernel/signal.c:3037)
[   98.592753][  T167]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.592888][  T167]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.593077][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.593213][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.593356][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.593493][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.593627][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.593793][  T167]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.593926][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.594154][  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)
[   98.594293][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.594426][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.594591][  T167] RIP: 0033:0x4c2d9e
[   98.594701][  T167] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.594885][  T167] RSP: 002b:00007ffc7643ba40 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.595168][  T167] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[   98.595370][  T167] RDX: 0000000000000014 RSI: 00007ffc7643bb20 RDI: 0000000000000007
[   98.595570][  T167] RBP: 00007ffc7643ba50 R08: 00007ffc7643bae0 R09: 000000000000000c
[   98.595769][  T167] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000031c27930
[   98.595971][  T167] R13: 00007ffc7643c670 R14: 00007ffc7643bc10 R15: 0000000000543540
| [   98.608614][  T167] ------------[ cut here ]------------
| [   98.608765][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [   98.609031][  T167] Modules linked in:
| [   98.609429][  T167] Tainted: [W]=WARN
[   98.609526][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.609687][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.609856][  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
[   98.610327][  T167] RSP: 0018:ffa0000000787820 EFLAGS: 00010286
[   98.610491][  T167] RAX: 00000000ffffffa6 RBX: ff110000141673c0 RCX: 1ff40000000f0eca
[   98.610686][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000014167470
[   98.610878][  T167] RBP: ff11000011f40000 R08: 1fe220000282ce8f R09: ff110000136d2e58
[   98.611078][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   98.611278][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.611473][  T167] FS:  0000000000000000(0000) GS:ff110000875d3000(0000) knlGS:0000000000000000
[   98.611700][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.611863][  T167] CR2: 000055b24e0d1c30 CR3: 00000000137f3002 CR4: 0000000000771ef0
[   98.612065][  T167] PKRU: 55555554
[   98.612163][  T167] Call Trace:
[   98.612263][  T167]  <TASK>
[   98.612332][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.612498][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.612659][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.612789][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.612919][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.613055][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.613186][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.613319][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.613447][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.613578][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.613706][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.613834][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.613967][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.614099][  T167]  __fput (fs/file_table.c:510)
[   98.614200][  T167]  task_work_run (kernel/task_work.c:233)
[   98.614333][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.614464][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[   98.614595][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.614728][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.614825][  T167]  ? exit_notify (kernel/exit.c:748)
[   98.614952][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.615086][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.615214][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.615352][  T167]  do_group_exit (kernel/exit.c:1119)
[   98.615483][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.615647][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.615778][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.615906][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.616046][  T167]  get_signal (kernel/signal.c:3037)
[   98.616177][  T167]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.616312][  T167]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.616443][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.616576][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.616707][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.616839][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.616971][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.617137][  T167]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.617269][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.617402][  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)
[   98.617532][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.617660][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.617820][  T167] RIP: 0033:0x4c2d9e
[   98.617922][  T167] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.618094][  T167] RSP: 002b:00007ffc7643ba40 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.618296][  T167] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[   98.618490][  T167] RDX: 0000000000000014 RSI: 00007ffc7643bb20 RDI: 0000000000000007
[   98.618683][  T167] RBP: 00007ffc7643ba50 R08: 00007ffc7643bae0 R09: 000000000000000c
[   98.618873][  T167] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000031c27930
[   98.619071][  T167] R13: 00007ffc7643c670 R14: 00007ffc7643bc10 R15: 0000000000543540
| [   98.637837][   T12] ------------[ cut here ]------------
| [   98.638562][   T12] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#1: 0/12
| [   98.638856][   T12] Modules linked in:
| [   98.639515][   T12] Tainted: [W]=WARN
[   98.639670][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.639919][   T12] Workqueue: netns cleanup_net
[   98.640298][   T12] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.640456][   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
[   98.640922][   T12] RSP: 0018:ffa00000000c7878 EFLAGS: 00010286
[   98.641172][   T12] RAX: 00000000ffffffa6 RBX: ff11000014167e40 RCX: 1ff4000000018ed5
[   98.641358][   T12] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000014167ef0
[   98.641548][   T12] RBP: ff11000008969000 R08: 1fe220000282cfdf R09: ff11000001afd1d0
[   98.641734][   T12] R10: 0000000000000001 R11: 0000000000000001 R12: 00000000ffffffff
[   98.641914][   T12] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.642107][   T12] FS:  0000000000000000(0000) GS:ff11000087653000(0000) knlGS:0000000000000000
[   98.642324][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.642478][   T12] CR2: 00007f2751de0680 CR3: 0000000009bfc005 CR4: 0000000000771ef0
[   98.642660][   T12] PKRU: 55555554
[   98.642751][   T12] Call Trace:
[   98.642841][   T12]  <TASK>
[   98.642906][   T12]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.643112][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.643274][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   98.643396][   T12]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   98.643517][   T12]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   98.643637][   T12]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   98.643759][   T12]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   98.643880][   T12]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   98.644004][   T12]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   98.644127][   T12]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   98.644258][   T12]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   98.644377][   T12]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.644501][   T12]  cleanup_net (net/core/net_namespace.c:702)
[   98.644625][   T12]  ? net_passive_dec (./include/linux/llist.h:241)
[   98.644745][   T12]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   98.644868][   T12]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   98.644988][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.645145][   T12]  process_one_work (kernel/workqueue.c:3314)
[   98.645278][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   98.645402][   T12]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.645526][   T12]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   98.645650][   T12]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.645770][   T12]  kthread (kernel/kthread.c:436)
[   98.645863][   T12]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.646022][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[   98.646143][   T12]  ret_from_fork (arch/x86/kernel/process.c:158)
[   98.646270][   T12]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   98.646420][   T12]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   98.646541][   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