======================================
| xx__-> [    9.304577][  T167] ------------[ cut here ]------------
| [    9.304799][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: unshare/167
| [    9.305135][  T167] Modules linked in:
| [    9.305570][  T167] Tainted: [W]=WARN
[    9.305671][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.305845][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.306016][  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
[    9.306497][  T167] RSP: 0018:ffa0000000827ab0 EFLAGS: 00010286
[    9.306693][  T167] RAX: 00000000ffffffa6 RBX: ff11000008f4edc0 RCX: 1ff4000000104f1c
[    9.306936][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000008f4ee70
[    9.307186][  T167] RBP: ff110000074a4000 R08: 1fe22000011e9dcf R09: ff110000134fd180
[    9.307408][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[    9.307638][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff110000074a4000
[    9.307909][  T167] FS:  00007f337bd7f740(0000) GS:ff110000819d3000(0000) knlGS:0000000000000000
[    9.308187][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.308386][  T167] CR2: 0000558532f15310 CR3: 00000000135ca001 CR4: 0000000000771ef0
[    9.308616][  T167] PKRU: 55555554
[    9.308820][  T167] Call Trace:
[    9.308945][  T167]  <TASK>
[    9.309061][  T167]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    9.309230][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.309393][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[    9.309569][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.309697][  T167]  register_netdevice (net/core/dev.c:11488)
[    9.309861][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    9.310084][  T167]  register_netdev (net/core/dev.c:11552)
[    9.310245][  T167]  loopback_net_init (drivers/net/loopback.c:218)
[    9.310406][  T167]  ops_init (net/core/net_namespace.c:137)
[    9.310563][  T167]  setup_net (net/core/net_namespace.c:446)
[    9.310667][  T167]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    9.310797][  T167]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    9.310928][  T167]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    9.311093][  T167]  copy_net_ns (net/core/net_namespace.c:579)
[    9.311225][  T167]  create_new_namespaces (kernel/nsproxy.c:132)
[    9.311357][  T167]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    9.311487][  T167]  ksys_unshare (kernel/fork.c:3243)
[    9.311624][  T167]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    9.311757][  T167]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    9.311896][  T167]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    9.312130][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.312265][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.312395][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.312529][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.312778][  T167] RIP: 0033:0x7f337be7abcb
[    9.312921][  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
[    9.313483][  T167] RSP: 002b:00007ffdebbb7bc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    9.313712][  T167] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f337be7abcb
[    9.313999][  T167] RDX: 0000000000000000 RSI: 00007ffdebbb7930 RDI: 0000000040000000
[    9.314196][  T167] RBP: 00007ffdebbb7f50 R08: 00007ffdebbb7b20 R09: 0000000000000000
[    9.314389][  T167] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    9.314672][  T167] R13: 0000000000000000 R14: 00000000ffffffff R15: 0000558532f18b68
| [    9.347752][  T167] ------------[ cut here ]------------
| [    9.347899][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [    9.348147][  T167] Modules linked in:
| [    9.348525][  T167] Tainted: [W]=WARN
[    9.348618][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.348766][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.348921][  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
[    9.349350][  T167] RSP: 0018:ffa0000000827b58 EFLAGS: 00010286
[    9.349504][  T167] RAX: 00000000ffffffa6 RBX: ff1100000b22ac40 RCX: 1ff4000000104f31
[    9.349685][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000b22acf0
[    9.349865][  T167] RBP: ff1100000a4f0000 R08: 1fe220000164559f R09: ff110000134fd158
[    9.350049][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[    9.350225][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000a4f0000
[    9.350404][  T167] FS:  000000002e178400(0000) GS:ff110000819d3000(0000) knlGS:0000000000000000
[    9.350626][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.350778][  T167] CR2: 00007f43d173c000 CR3: 0000000013598002 CR4: 0000000000771ef0
[    9.350961][  T167] PKRU: 55555554
[    9.351061][  T167] Call Trace:
[    9.351152][  T167]  <TASK>
[    9.351214][  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))
[    9.351336][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.351460][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[    9.351583][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.351675][  T167]  register_netdevice (net/core/dev.c:11488)
[    9.351801][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    9.351951][  T167]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    9.352080][  T167]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    9.352206][  T167]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    9.352325][  T167]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    9.352420][  T167]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    9.352545][  T167]  ? build_open_flags (fs/open.c:1212)
[    9.352666][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    9.352785][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    9.352905][  T167]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    9.353023][  T167]  ? fput_close_sync (fs/file_table.c:615)
[    9.353149][  T167]  ? __ia32_sys_open (fs/open.c:1374)
[    9.353273][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.353394][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.353518][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.353642][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.353761][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.353909][  T167] RIP: 0033:0x47cc8d
[    9.354006][  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 
[    9.354443][  T167] RSP: 002b:00007ffef8612f30 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.354628][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.354811][  T167] RDX: 00007ffef8612fb0 RSI: 00000000400454ca RDI: 0000000000000005
[    9.354991][  T167] RBP: 00007ffef8612f80 R08: 0000000000000000 R09: 0000000000000000
[    9.355175][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffef8613488
[    9.355355][  T167] R13: 00007ffef8613510 R14: 0000000000000002 R15: 0000000000543540
| [    9.356978][  T167] ------------[ cut here ]------------
| [    9.357102][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [    9.357334][  T167] Modules linked in:
| [    9.357707][  T167] Tainted: [W]=WARN
[    9.357797][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.357945][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.358107][  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
[    9.358545][  T167] RSP: 0018:ffa0000000827c58 EFLAGS: 00010286
[    9.358694][  T167] RAX: 00000000ffffffa6 RBX: ff1100000b22a040 RCX: 1ff4000000104f51
[    9.358872][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000b22a0f0
[    9.359057][  T167] RBP: ff1100000a4f0000 R08: 1fe220000164541f R09: ff110000134fd158
[    9.359235][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[    9.359414][  T167] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
[    9.359595][  T167] FS:  000000002e178400(0000) GS:ff110000819d3000(0000) knlGS:0000000000000000
[    9.359802][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.359958][  T167] CR2: 00007f43d173c000 CR3: 0000000013598002 CR4: 0000000000771ef0
[    9.360146][  T167] PKRU: 55555554
[    9.360236][  T167] Call Trace:
[    9.360325][  T167]  <TASK>
[    9.360388][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    9.360511][  T167]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    9.360636][  T167]  notifier_call_chain (kernel/notifier.c:85)
[    9.360757][  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)
[    9.360879][  T167]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    9.361033][  T167]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    9.361159][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    9.361278][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    9.361400][  T167]  ? update_socket_protocol+0x10/0x10
[    9.361524][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[    9.361645][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.361768][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.361887][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.362008][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.362132][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.362282][  T167] RIP: 0033:0x47cc8d
[    9.362378][  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 
[    9.362804][  T167] RSP: 002b:00007ffef8612f70 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.362987][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.363170][  T167] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    9.363349][  T167] RBP: 00007ffef8612fc0 R08: 0000000000000000 R09: 0000000000000000
[    9.363539][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffef8613488
[    9.363721][  T167] R13: 00007ffef8613510 R14: 0000000000000002 R15: 0000000000543540
| [    9.365467][  T167] ------------[ cut here ]------------
| [    9.365597][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [    9.365845][  T167] Modules linked in:
| [    9.366282][  T167] Tainted: [W]=WARN
[    9.366379][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.366541][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.366706][  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
[    9.367266][  T167] RSP: 0018:ffa0000000827850 EFLAGS: 00010286
[    9.367432][  T167] RAX: 00000000ffffffa6 RBX: ff1100000b22bb40 RCX: 1ff4000000104ed0
[    9.367712][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000b22bbf0
[    9.367903][  T167] RBP: ff1100000a4f0000 R08: 1fe220000164577f R09: ff110000134fd158
[    9.368097][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
[    9.368376][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000005860900
[    9.368571][  T167] FS:  000000002e178400(0000) GS:ff110000819d3000(0000) knlGS:0000000000000000
[    9.368798][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.369049][  T167] CR2: 00007f43d173c000 CR3: 0000000013598002 CR4: 0000000000771ef0
[    9.369241][  T167] PKRU: 55555554
[    9.369336][  T167] Call Trace:
[    9.369520][  T167]  <TASK>
[    9.369587][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.369715][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.369812][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    9.369939][  T167]  __dev_notify_flags (net/core/dev.c:9787)
[    9.370155][  T167]  ? netif_change_name (net/core/dev.c:1495)
[    9.370284][  T167]  ? __dev_change_flags (net/core/dev.c:9752)
[    9.370412][  T167]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    9.370542][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    9.370755][  T167]  netif_change_flags (net/core/dev.c:9820)
[    9.370881][  T167]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    9.371011][  T167]  dev_change_flags (net/core/dev_api.c:68)
[    9.371145][  T167]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    9.371361][  T167]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    9.371490][  T167]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    9.371623][  T167]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    9.371718][  T167]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    9.371933][  T167]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    9.372071][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    9.372204][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    9.372331][  T167]  sock_do_ioctl (net/socket.c:1313)
[    9.372550][  T167]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    9.372679][  T167]  ? ioctl_file_clone (fs/ioctl.c:244)
[    9.372808][  T167]  sock_ioctl (net/socket.c:1434)
[    9.372905][  T167]  ? br_ioctl_call (net/socket.c:1279)
[    9.373037][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    9.373172][  T167]  ? update_socket_protocol+0x10/0x10
[    9.373300][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[    9.373428][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.373564][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.373690][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.373817][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.373946][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.374197][  T167] RIP: 0033:0x47cc8d
[    9.374298][  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 
[    9.374843][  T167] RSP: 002b:00007ffef8612f50 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.375043][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.375233][  T167] RDX: 00007ffef8612fc0 RSI: 0000000000008914 RDI: 0000000000000006
[    9.375511][  T167] RBP: 00007ffef8612fa0 R08: 0000000000000000 R09: 0000000000000000
[    9.375699][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffef8613488
[    9.375888][  T167] R13: 00007ffef8613510 R14: 0000000000000002 R15: 0000000000543540
| [   99.170272][  T167] ------------[ cut here ]------------
| [   99.170473][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [   99.170760][  T167] Modules linked in:
| [   99.171193][  T167] Tainted: [W]=WARN
[   99.171296][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   99.171465][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   99.171640][  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
[   99.172187][  T167] RSP: 0018:ffa00000008276f0 EFLAGS: 00010286
[   99.172360][  T167] RAX: 00000000ffffffa6 RBX: ff11000004a9e4c0 RCX: 1ff4000000104ea4
[   99.172555][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004a9e570
[   99.172753][  T167] RBP: ff1100000a4f0000 R08: 1fe2200000953caf R09: ff110000134fd158
[   99.172953][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000041
[   99.173208][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ffa0000000827790
[   99.173413][  T167] FS:  0000000000000000(0000) GS:ff110000819d3000(0000) knlGS:0000000000000000
[   99.173644][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   99.173815][  T167] CR2: 00007fa746b7f6f0 CR3: 000000000fb39004 CR4: 0000000000771ef0
[   99.174016][  T167] PKRU: 55555554
[   99.174208][  T167] Call Trace:
[   99.174308][  T167]  <TASK>
[   99.174461][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   99.174598][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   99.174699][  T167]  netif_close_many (net/core/dev.c:1804)
[   99.174841][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.174973][  T167]  ? __dev_close_many (net/core/dev.c:1781)
[   99.175168][  T167]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   99.175332][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   99.175494][  T167]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   99.175624][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   99.175791][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.175920][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.176141][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.176271][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   99.176406][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   99.176536][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   99.176744][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.176882][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   99.177014][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   99.177219][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   99.177347][  T167]  __fput (fs/file_table.c:510)
[   99.177453][  T167]  task_work_run (kernel/task_work.c:233)
[   99.177588][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.177718][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[   99.177864][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   99.177995][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   99.178187][  T167]  ? exit_notify (kernel/exit.c:748)
[   99.178313][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.178443][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.178576][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   99.178709][  T167]  do_group_exit (kernel/exit.c:1119)
[   99.178843][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   99.179001][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.179209][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   99.179340][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   99.179470][  T167]  get_signal (kernel/signal.c:3037)
[   99.179603][  T167]  ? __raw_spin_lock_init (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/spinlock_debug.c:25)
[   99.179734][  T167]  ? mark_usage (kernel/locking/lockdep.c:4674)
[   99.179868][  T167]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   99.179996][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[   99.180191][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   99.180317][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.180447][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   99.180579][  T167]  ? fd_install (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:960 (discriminator 2) fs/file.c:699 (discriminator 2))
[   99.180710][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   99.180850][  T167]  ? update_socket_protocol+0x10/0x10
[   99.180979][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[   99.181203][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.181333][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   99.181494][  T167]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   99.181622][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.181753][  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)
[   99.181882][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[   99.182011][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   99.182257][  T167] RIP: 0033:0x47ea2b
[   99.182364][  T167] Code: Unable to access opcode bytes at 0x47ea01.

Code starting with the faulting instruction
===========================================
[   99.182555][  T167] RSP: 002b:00007ffef86129d8 EFLAGS: 00000202 ORIG_RAX: 0000000000000029
[   99.182760][  T167] RAX: 0000000000000007 RBX: 00007ffef8612ab0 RCX: 000000000047ea2b
[   99.182953][  T167] RDX: 0000000000000000 RSI: 0000000000080003 RDI: 0000000000000010
[   99.183219][  T167] RBP: 00007ffef8612a10 R08: 0000000000000041 R09: 000000002e1793e0
[   99.183413][  T167] R10: 0000000000000040 R11: 0000000000000202 R12: 00007ffef8613488
[   99.183604][  T167] R13: 00007ffef8613510 R14: 00007ffef8612f88 R15: 0000000000543540
| [   99.195442][  T167] ------------[ cut here ]------------
| [   99.195593][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/167
| [   99.195856][  T167] Modules linked in:
| [   99.196255][  T167] Tainted: [W]=WARN
[   99.196355][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   99.196514][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   99.196680][  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
[   99.197143][  T167] RSP: 0018:ffa0000000827820 EFLAGS: 00010286
[   99.197302][  T167] RAX: 00000000ffffffa6 RBX: ff1100000b1b8dc0 RCX: 1ff4000000104eca
[   99.197491][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000b1b8e70
[   99.197681][  T167] RBP: ff1100000a4f0000 R08: 1fe22000016371cf R09: ff110000134fd158
[   99.197875][  T167] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   99.198070][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   99.198270][  T167] FS:  0000000000000000(0000) GS:ff110000819d3000(0000) knlGS:0000000000000000
[   99.198564][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   99.198811][  T167] CR2: 00007fa746b7f6f0 CR3: 000000000fb39004 CR4: 0000000000771ef0
[   99.199115][  T167] PKRU: 55555554
[   99.199258][  T167] Call Trace:
[   99.199372][  T167]  <TASK>
[   99.199440][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   99.199605][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   99.199764][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.199897][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.200023][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.200157][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   99.200287][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   99.200415][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   99.200541][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.200670][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   99.200800][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   99.200930][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   99.201505][  T167]  __fput (fs/file_table.c:510)
[   99.201607][  T167]  task_work_run (kernel/task_work.c:233)
[   99.201734][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.201866][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[   99.201994][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   99.202131][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   99.202228][  T167]  ? exit_notify (kernel/exit.c:748)
[   99.202356][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.202482][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.202607][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   99.202737][  T167]  do_group_exit (kernel/exit.c:1119)
[   99.202868][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   99.203031][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.203158][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   99.203283][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   99.203408][  T167]  get_signal (kernel/signal.c:3037)
[   99.203536][  T167]  ? __raw_spin_lock_init (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/spinlock_debug.c:25)
[   99.203665][  T167]  ? mark_usage (kernel/locking/lockdep.c:4674)
[   99.203796][  T167]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   99.203924][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[   99.204057][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   99.204183][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.204310][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   99.204442][  T167]  ? fd_install (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:960 (discriminator 2) fs/file.c:699 (discriminator 2))
[   99.204571][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   99.204701][  T167]  ? update_socket_protocol+0x10/0x10
[   99.204834][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[   99.204960][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.205095][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   99.205254][  T167]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   99.205384][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.205513][  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)
[   99.205639][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[   99.205772][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   99.205931][  T167] RIP: 0033:0x47ea2b
[   99.206038][  T167] Code: Unable to access opcode bytes at 0x47ea01.

Code starting with the faulting instruction
===========================================
[   99.206203][  T167] RSP: 002b:00007ffef86129d8 EFLAGS: 00000202 ORIG_RAX: 0000000000000029
[   99.206396][  T167] RAX: 0000000000000007 RBX: 00007ffef8612ab0 RCX: 000000000047ea2b
[   99.206585][  T167] RDX: 0000000000000000 RSI: 0000000000080003 RDI: 0000000000000010
[   99.206778][  T167] RBP: 00007ffef8612a10 R08: 0000000000000041 R09: 000000002e1793e0
[   99.206970][  T167] R10: 0000000000000040 R11: 0000000000000202 R12: 00007ffef8613488
[   99.207165][  T167] R13: 00007ffef8613510 R14: 00007ffef8612f88 R15: 0000000000543540
| [   99.222143][   T12] ------------[ cut here ]------------
| [   99.222316][   T12] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: 0/12
| [   99.222597][   T12] Modules linked in:
| [   99.222997][   T12] Tainted: [W]=WARN
[   99.223743][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   99.223930][   T12] Workqueue: netns cleanup_net
[   99.224249][   T12] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   99.224440][   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
[   99.224865][   T12] RSP: 0018:ffa00000000c7878 EFLAGS: 00010286
[   99.225209][   T12] RAX: 00000000ffffffa6 RBX: ff1100000b1b96c0 RCX: 1ff4000000018ed5
[   99.225473][   T12] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000b1b9770
[   99.225901][   T12] RBP: ff110000074a4000 R08: 1fe22000016372ef R09: ff11000001afd1d0
[   99.226264][   T12] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[   99.226443][   T12] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   99.226621][   T12] FS:  0000000000000000(0000) GS:ff11000081b53000(0000) knlGS:0000000000000000
[   99.226837][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   99.226987][   T12] CR2: 00007feba8e2f770 CR3: 000000000fb39003 CR4: 0000000000771ef0
[   99.227257][   T12] PKRU: 55555554
[   99.227350][   T12] Call Trace:
[   99.227440][   T12]  <TASK>
[   99.227503][   T12]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   99.227658][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   99.227813][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   99.227934][   T12]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   99.228111][   T12]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   99.228228][   T12]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   99.228358][   T12]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   99.228481][   T12]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   99.228601][   T12]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   99.228721][   T12]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   99.228849][   T12]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   99.228985][   T12]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.229139][   T12]  cleanup_net (net/core/net_namespace.c:702)
[   99.229267][   T12]  ? net_passive_dec (./include/linux/llist.h:241)
[   99.229398][   T12]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   99.229537][   T12]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   99.229679][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.229813][   T12]  process_one_work (kernel/workqueue.c:3314)
[   99.229946][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   99.230131][   T12]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   99.230265][   T12]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   99.230387][   T12]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   99.230504][   T12]  kthread (kernel/kthread.c:436)
[   99.230600][   T12]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   99.230756][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[   99.230875][   T12]  ret_from_fork (arch/x86/kernel/process.c:158)
[   99.230995][   T12]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   99.231150][   T12]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   99.231268][   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