======================================
| xx__-> [    8.307689][  T166] ------------[ cut here ]------------
| [    8.307914][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: unshare/166
| [    8.308201][  T166] Modules linked in:
| [    8.308584][  T166] Tainted: [W]=WARN
[    8.308687][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.308848][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.309023][  T166] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    8.309475][  T166] RSP: 0018:ffa00000007e7ab0 EFLAGS: 00010286
[    8.309640][  T166] RAX: 00000000ffffffa6 RBX: ff1100000b9ef240 RCX: 1ff40000000fcf1c
[    8.309831][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000b9ef2f0
[    8.310025][  T166] RBP: ff1100000a0e9000 R08: 1fe220000173de5f R09: ff1100000cc08b80
[    8.310214][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[    8.310404][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000a0e9000
[    8.310600][  T166] FS:  00007f34de2f1740(0000) GS:ff1100007df53000(0000) knlGS:0000000000000000
[    8.310823][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.310989][  T166] CR2: 000056295a6fd310 CR3: 000000000c722001 CR4: 0000000000771ef0
[    8.311182][  T166] PKRU: 55555554
[    8.311279][  T166] Call Trace:
[    8.311375][  T166]  <TASK>
[    8.311441][  T166]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    8.311578][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.311711][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.311840][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.311942][  T166]  register_netdevice (net/core/dev.c:11488)
[    8.312073][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.312237][  T166]  register_netdev (net/core/dev.c:11552)
[    8.312364][  T166]  loopback_net_init (drivers/net/loopback.c:218)
[    8.312495][  T166]  ops_init (net/core/net_namespace.c:137)
[    8.312596][  T166]  setup_net (net/core/net_namespace.c:446)
[    8.312692][  T166]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    8.312817][  T166]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    8.312949][  T166]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    8.313078][  T166]  copy_net_ns (net/core/net_namespace.c:579)
[    8.313207][  T166]  create_new_namespaces (kernel/nsproxy.c:132)
[    8.313338][  T166]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    8.313465][  T166]  ksys_unshare (kernel/fork.c:3243)
[    8.313598][  T166]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    8.313728][  T166]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    8.313858][  T166]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    8.313986][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.314112][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.314241][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.314371][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.314529][  T166] RIP: 0033:0x7f34de3ecbcb
[    8.314667][  T166] Code: 73 01 c3 48 8b 0d 2d 82 0f 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d fd 81 0f 00 f7 d8 64 89 01 48
All code
========
   0:	73 01                	jae    0x3
   2:	c3                   	ret
   3:	48 8b 0d 2d 82 0f 00 	mov    0xf822d(%rip),%rcx        # 0xf8237
   a:	f7 d8                	neg    %eax
   c:	64 89 01             	mov    %eax,%fs:(%rcx)
   f:	48 83 c8 ff          	or     $0xffffffffffffffff,%rax
  13:	c3                   	ret
  14:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  1b:	00 00 00 
  1e:	90                   	nop
  1f:	f3 0f 1e fa          	endbr64
  23:	b8 10 01 00 00       	mov    $0x110,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax		<-- trapping instruction
  30:	73 01                	jae    0x33
  32:	c3                   	ret
  33:	48 8b 0d fd 81 0f 00 	mov    0xf81fd(%rip),%rcx        # 0xf8237
  3a:	f7 d8                	neg    %eax
  3c:	64 89 01             	mov    %eax,%fs:(%rcx)
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax
   6:	73 01                	jae    0x9
   8:	c3                   	ret
   9:	48 8b 0d fd 81 0f 00 	mov    0xf81fd(%rip),%rcx        # 0xf820d
  10:	f7 d8                	neg    %eax
  12:	64 89 01             	mov    %eax,%fs:(%rcx)
  15:	48                   	rex.W
[    8.315123][  T166] RSP: 002b:00007ffd1b482988 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    8.315318][  T166] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f34de3ecbcb
[    8.315508][  T166] RDX: 0000000000000000 RSI: 00007ffd1b4826f0 RDI: 0000000040000000
[    8.315702][  T166] RBP: 00007ffd1b482d10 R08: 00007ffd1b4828e0 R09: 0000000000000000
[    8.315897][  T166] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    8.316089][  T166] R13: 0000000000000000 R14: 00000000ffffffff R15: 000056295a700b68
| [    8.345002][  T166] ------------[ cut here ]------------
| [    8.345139][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [    8.345375][  T166] Modules linked in:
| [    8.345746][  T166] Tainted: [W]=WARN
[    8.345839][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.345993][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.346147][  T166] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    8.346562][  T166] RSP: 0018:ffa00000007e7b58 EFLAGS: 00010286
[    8.346718][  T166] RAX: 00000000ffffffa6 RBX: ff110000093cd6c0 RCX: 1ff40000000fcf31
[    8.346894][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000093cd770
[    8.347081][  T166] RBP: ff1100000b0d8000 R08: 1fe2200001279aef R09: ff1100000cc08b58
[    8.347253][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[    8.347425][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000b0d8000
[    8.347601][  T166] FS:  000000002fde1400(0000) GS:ff1100007df53000(0000) knlGS:0000000000000000
[    8.347809][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.347963][  T166] CR2: 00007fd0e016f000 CR3: 000000000cc13002 CR4: 0000000000771ef0
[    8.348138][  T166] PKRU: 55555554
[    8.348230][  T166] Call Trace:
[    8.348318][  T166]  <TASK>
[    8.348378][  T166]  ? ip6_route_dev_notify (./include/net/net_namespace.h:419 (discriminator 1) ./include/linux/netdevice.h:2776 (discriminator 1) net/ipv6/route.c:6476 (discriminator 1))
[    8.348496][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.348615][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.348733][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.348825][  T166]  register_netdevice (net/core/dev.c:11488)
[    8.348947][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.349093][  T166]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    8.349211][  T166]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    8.349331][  T166]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    8.349447][  T166]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    8.349536][  T166]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    8.349656][  T166]  ? build_open_flags (fs/open.c:1212)
[    8.349774][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.350009][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    8.350127][  T166]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    8.350242][  T166]  ? fput_close_sync (fs/file_table.c:615)
[    8.350359][  T166]  ? __ia32_sys_open (fs/open.c:1374)
[    8.350475][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.350595][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.350710][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.350825][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.350955][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.351098][  T166] RIP: 0033:0x47cc8d
[    8.351190][  T166] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[    8.351608][  T166] RSP: 002b:00007ffc877130c0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.351783][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.351961][  T166] RDX: 00007ffc87713140 RSI: 00000000400454ca RDI: 0000000000000005
[    8.352131][  T166] RBP: 00007ffc87713110 R08: 0000000000000000 R09: 0000000000000000
[    8.352302][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc87713618
[    8.352476][  T166] R13: 00007ffc877136a0 R14: 0000000000000002 R15: 0000000000543540
| [    8.354045][  T166] ------------[ cut here ]------------
| [    8.354158][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [    8.354381][  T166] Modules linked in:
| [    8.354749][  T166] Tainted: [W]=WARN
[    8.354835][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.354981][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.355130][  T166] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    8.355531][  T166] RSP: 0018:ffa00000007e7c58 EFLAGS: 00010286
[    8.355676][  T166] RAX: 00000000ffffffa6 RBX: ff110000093cdcc0 RCX: 1ff40000000fcf51
[    8.355848][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000093cdd70
[    8.356020][  T166] RBP: ff1100000b0d8000 R08: 1fe2200001279baf R09: ff1100000cc08b58
[    8.356188][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
[    8.356356][  T166] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000003
[    8.356525][  T166] FS:  000000002fde1400(0000) GS:ff1100007df53000(0000) knlGS:0000000000000000
[    8.356725][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.356871][  T166] CR2: 00007fd0e016f000 CR3: 000000000cc13002 CR4: 0000000000771ef0
[    8.357043][  T166] PKRU: 55555554
[    8.357138][  T166] Call Trace:
[    8.357223][  T166]  <TASK>
[    8.357282][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    8.357398][  T166]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    8.357512][  T166]  notifier_call_chain (kernel/notifier.c:85)
[    8.357631][  T166]  netdev_update_features (net/core/dev.c:2287 net/core/dev.c:2301 net/core/dev.c:1590 net/core/dev.c:11099 net/core/dev.c:11096)
[    8.357743][  T166]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    8.357889][  T166]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    8.358003][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.358118][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.358238][  T166]  ? update_socket_protocol+0x10/0x10
[    8.358353][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    8.358470][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.358585][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.358702][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.358817][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.358936][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.359080][  T166] RIP: 0033:0x47cc8d
[    8.359170][  T166] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[    8.359573][  T166] RSP: 002b:00007ffc87713100 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.359754][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.360080][  T166] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    8.360250][  T166] RBP: 00007ffc87713150 R08: 0000000000000005 R09: 0000000000001ff0
[    8.360420][  T166] R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffc87713618
[    8.360593][  T166] R13: 00007ffc877136a0 R14: 0000000000000002 R15: 0000000000543540
| [    8.362187][  T166] ------------[ cut here ]------------
| [    8.362308][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [    8.362548][  T166] Modules linked in:
| [    8.362975][  T166] Tainted: [W]=WARN
[    8.363067][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.363220][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.363380][  T166] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    8.363814][  T166] RSP: 0018:ffa00000007e7850 EFLAGS: 00010286
[    8.363973][  T166] RAX: 00000000ffffffa6 RBX: ff110000093cd0c0 RCX: 1ff40000000fced0
[    8.364157][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000093cd170
[    8.364340][  T166] RBP: ff1100000b0d8000 R08: 1fe2200001279a2f R09: ff1100000cc08b58
[    8.364521][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000001
[    8.364708][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff110000057a8900
[    8.364898][  T166] FS:  000000002fde1400(0000) GS:ff1100007df53000(0000) knlGS:0000000000000000
[    8.365115][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.365270][  T166] CR2: 00007fd0e016f000 CR3: 000000000cc13002 CR4: 0000000000771ef0
[    8.365453][  T166] PKRU: 55555554
[    8.365542][  T166] Call Trace:
[    8.365638][  T166]  <TASK>
[    8.365700][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.365826][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.365924][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    8.366047][  T166]  __dev_notify_flags (net/core/dev.c:9787)
[    8.366170][  T166]  ? netif_change_name (net/core/dev.c:1495)
[    8.366292][  T166]  ? __dev_change_flags (net/core/dev.c:9752)
[    8.366415][  T166]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    8.366538][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    8.366678][  T166]  netif_change_flags (net/core/dev.c:9820)
[    8.366801][  T166]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    8.366928][  T166]  dev_change_flags (net/core/dev_api.c:68)
[    8.367051][  T166]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    8.367174][  T166]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    8.367297][  T166]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    8.367421][  T166]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    8.367514][  T166]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    8.367644][  T166]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    8.367772][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.367899][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.368023][  T166]  sock_do_ioctl (net/socket.c:1313)
[    8.368146][  T166]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    8.368272][  T166]  ? ioctl_file_clone (fs/ioctl.c:244)
[    8.368396][  T166]  sock_ioctl (net/socket.c:1434)
[    8.368489][  T166]  ? br_ioctl_call (net/socket.c:1279)
[    8.368619][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.368742][  T166]  ? update_socket_protocol+0x10/0x10
[    8.368867][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    8.368993][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.369116][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.369239][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.369361][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.369485][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.369641][  T166] RIP: 0033:0x47cc8d
[    8.369736][  T166] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[    8.370172][  T166] RSP: 002b:00007ffc877130e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.370358][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.370537][  T166] RDX: 00007ffc87713150 RSI: 0000000000008914 RDI: 0000000000000006
[    8.370721][  T166] RBP: 00007ffc87713130 R08: 0000000000000005 R09: 0000000000001ff0
[    8.370908][  T166] R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffc87713618
[    8.371092][  T166] R13: 00007ffc877136a0 R14: 0000000000000002 R15: 0000000000543540
| [   98.167044][  T166] ------------[ cut here ]------------
| [   98.167238][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [   98.167531][  T166] Modules linked in:
| [   98.167972][  T166] Tainted: [W]=WARN
[   98.168080][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.168259][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.168449][  T166] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   98.168947][  T166] RSP: 0018:ffa00000007e76f0 EFLAGS: 00010286
[   98.169124][  T166] RAX: 00000000ffffffa6 RBX: ff110000093b3cc0 RCX: 1ff40000000fcea4
[   98.169335][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000093b3d70
[   98.169541][  T166] RBP: ff1100000b0d8000 R08: 1fe22000012767af R09: ff1100000cc08b58
[   98.169747][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000041
[   98.170625][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ffa00000007e7790
[   98.170842][  T166] FS:  0000000000000000(0000) GS:ff1100007df53000(0000) knlGS:0000000000000000
[   98.171652][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.171837][  T166] CR2: 0000556bd0fb7c50 CR3: 0000000026139006 CR4: 0000000000771ef0
[   98.172827][  T166] PKRU: 55555554
[   98.173682][  T166] Call Trace:
[   98.173792][  T166]  <TASK>
[   98.174599][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   98.174747][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   98.175475][  T166]  netif_close_many (net/core/dev.c:1804)
[   98.175618][  T166]  ? asym_cpu_capacity_scan (./include/linux/rculist.h:103)
[   98.175757][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.175899][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.176036][  T166]  ? __dev_close_many (net/core/dev.c:1781)
[   98.176176][  T166]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   98.176351][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   98.176524][  T166]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   98.176662][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.176832][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.176971][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.177112][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.177250][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.177395][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.177533][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.177670][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.177807][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.177952][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.178092][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.178236][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.178382][  T166]  __fput (fs/file_table.c:510)
[   98.178493][  T166]  task_work_run (kernel/task_work.c:233)
[   98.178634][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.178772][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.178920][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.179062][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.179169][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.179308][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.179450][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.179589][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.179730][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.179871][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.180043][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.180180][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.180318][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.180458][  T166]  get_signal (kernel/signal.c:3037)
[   98.180600][  T166]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.180740][  T166]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.180884][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.181026][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.181166][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.181307][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.181451][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.181627][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.181767][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.181911][  T166]  do_syscall_64 (./include/linux/irq-entry-common.h:207 ./include/linux/irq-entry-common.h:230 ./include/linux/entry-common.h:318 arch/x86/entry/syscall_64.c:100)
[   98.182050][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.182206][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.182376][  T166] RIP: 0033:0x4c2d9e
[   98.182488][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.182679][  T166] RSP: 002b:00007ffc87712a70 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.182888][  T166] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[   98.183092][  T166] RDX: 0000000000000014 RSI: 00007ffc87712b50 RDI: 0000000000000007
[   98.183292][  T166] RBP: 00007ffc87712a80 R08: 00007ffc87712b10 R09: 000000000000000c
[   98.183494][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 000000002fdeb3f0
[   98.183694][  T166] R13: 00007ffc877136a0 R14: 00007ffc87712c40 R15: 0000000000543540
| [   98.187790][  T166] ------------[ cut here ]------------
| [   98.188520][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [   98.188783][  T166] Modules linked in:
| [   98.189232][  T166] Tainted: [W]=WARN
[   98.189340][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.189505][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.189683][  T166] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   98.190222][  T166] RSP: 0018:ffa00000007e7820 EFLAGS: 00010286
[   98.190404][  T166] RAX: 00000000ffffffa6 RBX: ff11000008e173c0 RCX: 1ff40000000fceca
[   98.190625][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000008e17470
[   98.190826][  T166] RBP: ff1100000b0d8000 R08: 1fe22000011c2e8f R09: ff1100000cc08b58
[   98.191047][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[   98.191260][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.191461][  T166] FS:  0000000000000000(0000) GS:ff1100007df53000(0000) knlGS:0000000000000000
[   98.191691][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.191864][  T166] CR2: 0000556bd0fb7c50 CR3: 0000000026139006 CR4: 0000000000771ef0
[   98.192063][  T166] PKRU: 55555554
[   98.192160][  T166] Call Trace:
[   98.192257][  T166]  <TASK>
[   98.192329][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.192497][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.192658][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.192789][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.192927][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.193152][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.193377][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.193508][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.193641][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.193771][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.193907][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.194038][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.194172][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.194302][  T166]  __fput (fs/file_table.c:510)
[   98.194495][  T166]  task_work_run (kernel/task_work.c:233)
[   98.194625][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.194756][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.194890][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.195107][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.195207][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.195339][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.195468][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.195598][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.195812][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.195946][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.196106][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.196236][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.196370][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.196498][  T166]  get_signal (kernel/signal.c:3037)
[   98.196630][  T166]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.196764][  T166]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.196900][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.197034][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.197169][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.197302][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.197439][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.197602][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.197733][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.197868][  T166]  do_syscall_64 (./include/linux/irq-entry-common.h:207 ./include/linux/irq-entry-common.h:230 ./include/linux/entry-common.h:318 arch/x86/entry/syscall_64.c:100)
[   98.198000][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.198131][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.198291][  T166] RIP: 0033:0x4c2d9e
[   98.198399][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.198564][  T166] RSP: 002b:00007ffc87712a70 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.198762][  T166] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[   98.198961][  T166] RDX: 0000000000000014 RSI: 00007ffc87712b50 RDI: 0000000000000007
[   98.199153][  T166] RBP: 00007ffc87712a80 R08: 00007ffc87712b10 R09: 000000000000000c
[   98.199353][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 000000002fdeb3f0
[   98.199549][  T166] R13: 00007ffc877136a0 R14: 00007ffc87712c40 R15: 0000000000543540
| [   98.215905][   T12] ------------[ cut here ]------------
| [   98.216077][   T12] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: 0/12
| [   98.216360][   T12] Modules linked in:
| [   98.216759][   T12] Tainted: [W]=WARN
[   98.216850][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.217298][   T12] Workqueue: netns cleanup_net
[   98.217438][   T12] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.217594][   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
[   98.218052][   T12] RSP: 0018:ffa00000000c7878 EFLAGS: 00010286
[   98.218204][   T12] RAX: 00000000ffffffa6 RBX: ff11000008da4f40 RCX: 1ff4000000018ed5
[   98.218390][   T12] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000008da4ff0
[   98.218569][   T12] RBP: ff1100000a0e9000 R08: 1fe22000011b49ff R09: ff11000001afd1d0
[   98.218747][   T12] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   98.218936][   T12] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.219122][   T12] FS:  0000000000000000(0000) GS:ff1100007ddd3000(0000) knlGS:0000000000000000
[   98.219335][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.219485][   T12] CR2: 00007f5503a49f98 CR3: 0000000026139001 CR4: 0000000000771ef0
[   98.219661][   T12] PKRU: 55555554
[   98.219749][   T12] Call Trace:
[   98.219837][   T12]  <TASK>
[   98.219906][   T12]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.220058][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.220207][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   98.220332][   T12]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   98.220450][   T12]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   98.220566][   T12]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   98.220685][   T12]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   98.220804][   T12]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   98.220925][   T12]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   98.221045][   T12]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   98.221166][   T12]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   98.221283][   T12]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.221411][   T12]  cleanup_net (net/core/net_namespace.c:702)
[   98.221528][   T12]  ? net_passive_dec (./include/linux/llist.h:241)
[   98.221650][   T12]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   98.221769][   T12]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   98.221896][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.222018][   T12]  process_one_work (kernel/workqueue.c:3314)
[   98.222148][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   98.222266][   T12]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.222393][   T12]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   98.222515][   T12]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.222637][   T12]  kthread (kernel/kthread.c:436)
[   98.222730][   T12]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.222885][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[   98.224089][   T12]  ret_from_fork (arch/x86/kernel/process.c:158)
[   98.224230][   T12]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   98.224387][   T12]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   98.224514][   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