======================================
| xx__-> [    8.833511][  T166] ------------[ cut here ]------------
| [    8.833726][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: unshare/166
| [    8.834029][  T166] Modules linked in:
| [    8.834455][  T166] Tainted: [W]=WARN
[    8.834559][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.834759][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.834942][  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
[    8.835434][  T166] RSP: 0018:ffa0000000837ab0 EFLAGS: 00010286
[    8.835608][  T166] RAX: 00000000ffffffa6 RBX: ff11000001efa640 RCX: 1ff4000000106f1c
[    8.835811][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000001efa6f0
[    8.836013][  T166] RBP: ff11000008949000 R08: 1fe22000003df4df R09: ff11000012f72e80
[    8.836215][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[    8.836432][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000008949000
[    8.836688][  T166] FS:  00007f03f0b42740(0000) GS:ff1100008cd53000(0000) knlGS:0000000000000000
[    8.837034][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.837288][  T166] CR2: 000055ff6a14c310 CR3: 000000001323e001 CR4: 0000000000771ef0
[    8.837627][  T166] PKRU: 55555554
[    8.837778][  T166] Call Trace:
[    8.837920][  T166]  <TASK>
[    8.837992][  T166]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    8.838129][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.838269][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.838421][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.838525][  T166]  register_netdevice (net/core/dev.c:11488)
[    8.838664][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.838834][  T166]  register_netdev (net/core/dev.c:11552)
[    8.838970][  T166]  loopback_net_init (drivers/net/loopback.c:218)
[    8.839107][  T166]  ops_init (net/core/net_namespace.c:137)
[    8.839212][  T166]  setup_net (net/core/net_namespace.c:446)
[    8.839316][  T166]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    8.839523][  T166]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    8.839662][  T166]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    8.839857][  T166]  copy_net_ns (net/core/net_namespace.c:579)
[    8.839996][  T166]  create_new_namespaces (kernel/nsproxy.c:132)
[    8.840133][  T166]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    8.840268][  T166]  ksys_unshare (kernel/fork.c:3243)
[    8.840484][  T166]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    8.840624][  T166]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    8.840758][  T166]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    8.840894][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.841028][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.841168][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.841304][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.841534][  T166] RIP: 0033:0x7f03f0c3dbcb
[    8.841681][  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
[    8.842161][  T166] RSP: 002b:00007ffeee5eab98 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    8.842426][  T166] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f03f0c3dbcb
[    8.842630][  T166] RDX: 0000000000000000 RSI: 00007ffeee5ea900 RDI: 0000000040000000
[    8.842834][  T166] RBP: 00007ffeee5eaf20 R08: 00007ffeee5eaaf0 R09: 0000000000000000
[    8.843035][  T166] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    8.843236][  T166] R13: 0000000000000000 R14: 00000000ffffffff R15: 000055ff6a14fb68
| [    8.866872][  T166] ------------[ cut here ]------------
| [    8.867028][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [    8.867281][  T166] Modules linked in:
| [    8.867710][  T166] Tainted: [W]=WARN
[    8.867804][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.867960][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.868124][  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
[    8.868574][  T166] RSP: 0018:ffa0000000837b58 EFLAGS: 00010286
[    8.868730][  T166] RAX: 00000000ffffffa6 RBX: ff110000095b33c0 RCX: 1ff4000000106f31
[    8.868915][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000095b3470
[    8.869100][  T166] RBP: ff11000012a10000 R08: 1fe22000012b668f R09: ff11000012f72e58
[    8.869284][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[    8.869475][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000012a10000
[    8.869661][  T166] FS:  0000000031abc400(0000) GS:ff1100008cd53000(0000) knlGS:0000000000000000
[    8.869880][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.870035][  T166] CR2: 00007fafeb125000 CR3: 0000000013d8a002 CR4: 0000000000771ef0
[    8.870220][  T166] PKRU: 55555554
[    8.870313][  T166] Call Trace:
[    8.870413][  T166]  <TASK>
[    8.870478][  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))
[    8.870604][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.870730][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.870856][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.870951][  T166]  register_netdevice (net/core/dev.c:11488)
[    8.871075][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.871229][  T166]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    8.871355][  T166]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    8.871498][  T166]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    8.871623][  T166]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    8.871717][  T166]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    8.871839][  T166]  ? build_open_flags (fs/open.c:1212)
[    8.871966][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.872092][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    8.872217][  T166]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    8.872342][  T166]  ? fput_close_sync (fs/file_table.c:615)
[    8.872477][  T166]  ? __ia32_sys_open (fs/open.c:1374)
[    8.872602][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.872729][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.872852][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.872975][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.873098][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.873252][  T166] RIP: 0033:0x47cc8d
[    8.873353][  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 
[    8.873802][  T166] RSP: 002b:00007ffd14042b30 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.873988][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.874172][  T166] RDX: 00007ffd14042bb0 RSI: 00000000400454ca RDI: 0000000000000005
[    8.874355][  T166] RBP: 00007ffd14042b80 R08: 0000000000000000 R09: 0000000000000000
[    8.874550][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd14043088
[    8.874734][  T166] R13: 00007ffd14043110 R14: 0000000000000002 R15: 0000000000543540
| [    8.876386][  T166] ------------[ cut here ]------------
| [    8.876508][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [    8.876756][  T166] Modules linked in:
| [    8.877127][  T166] Tainted: [W]=WARN
[    8.877220][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.877381][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.877540][  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
[    8.877973][  T166] RSP: 0018:ffa0000000837c58 EFLAGS: 00010286
[    8.878126][  T166] RAX: 00000000ffffffa6 RBX: ff110000095b3cc0 RCX: 1ff4000000106f51
[    8.878308][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000095b3d70
[    8.878498][  T166] RBP: ff11000012a10000 R08: 1fe22000012b67af R09: ff11000012f72e58
[    8.878681][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
[    8.878863][  T166] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000003
[    8.879046][  T166] FS:  0000000031abc400(0000) GS:ff1100008cd53000(0000) knlGS:0000000000000000
[    8.879265][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.879429][  T166] CR2: 00007fafeb125000 CR3: 0000000013d8a002 CR4: 0000000000771ef0
[    8.879613][  T166] PKRU: 55555554
[    8.879706][  T166] Call Trace:
[    8.879797][  T166]  <TASK>
[    8.879861][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    8.879984][  T166]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    8.880108][  T166]  notifier_call_chain (kernel/notifier.c:85)
[    8.880233][  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)
[    8.880364][  T166]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    8.880523][  T166]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    8.880649][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.880773][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.880901][  T166]  ? update_socket_protocol+0x10/0x10
[    8.881025][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    8.881151][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.881278][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.881410][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.881535][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.881656][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.881809][  T166] RIP: 0033:0x47cc8d
[    8.881905][  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 
[    8.882348][  T166] RSP: 002b:00007ffd14042b70 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.882541][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.882722][  T166] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    8.882907][  T166] RBP: 00007ffd14042bc0 R08: 0000000000000000 R09: 0000000000000000
[    8.883089][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd14043088
[    8.883274][  T166] R13: 00007ffd14043110 R14: 0000000000000002 R15: 0000000000543540
| [    8.884979][  T166] ------------[ cut here ]------------
| [    8.885109][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [    8.885375][  T166] Modules linked in:
| [    8.885771][  T166] Tainted: [W]=WARN
[    8.885871][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.886035][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.886204][  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
[    8.886676][  T166] RSP: 0018:ffa0000000837850 EFLAGS: 00010286
[    8.886843][  T166] RAX: 00000000ffffffa6 RBX: ff110000095b39c0 RCX: 1ff4000000106ed0
[    8.887038][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000095b3a70
[    8.887233][  T166] RBP: ff11000012a10000 R08: 1fe22000012b674f R09: ff11000012f72e58
[    8.887437][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000001
[    8.887636][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000005850900
[    8.887832][  T166] FS:  0000000031abc400(0000) GS:ff1100008cd53000(0000) knlGS:0000000000000000
[    8.888060][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.888224][  T166] CR2: 00007fafeb125000 CR3: 0000000013d8a002 CR4: 0000000000771ef0
[    8.888431][  T166] PKRU: 55555554
[    8.888529][  T166] Call Trace:
[    8.888626][  T166]  <TASK>
[    8.888692][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.888823][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.888922][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    8.889053][  T166]  __dev_notify_flags (net/core/dev.c:9787)
[    8.889183][  T166]  ? netif_change_name (net/core/dev.c:1495)
[    8.889316][  T166]  ? __dev_change_flags (net/core/dev.c:9752)
[    8.889454][  T166]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    8.889585][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    8.889719][  T166]  netif_change_flags (net/core/dev.c:9820)
[    8.889849][  T166]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    8.889983][  T166]  dev_change_flags (net/core/dev_api.c:68)
[    8.890115][  T166]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    8.890249][  T166]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    8.890388][  T166]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    8.890522][  T166]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    8.890621][  T166]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    8.890751][  T166]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    8.890889][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.891021][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.891152][  T166]  sock_do_ioctl (net/socket.c:1313)
[    8.891287][  T166]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    8.891428][  T166]  ? ioctl_file_clone (fs/ioctl.c:244)
[    8.891561][  T166]  sock_ioctl (net/socket.c:1434)
[    8.891660][  T166]  ? br_ioctl_call (net/socket.c:1279)
[    8.891791][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.891924][  T166]  ? update_socket_protocol+0x10/0x10
[    8.892053][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    8.892185][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.892317][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.892456][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.892588][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.892718][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.892881][  T166] RIP: 0033:0x47cc8d
[    8.892984][  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 
[    8.893455][  T166] RSP: 002b:00007ffd14042b50 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.893650][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.893845][  T166] RDX: 00007ffd14042bc0 RSI: 0000000000008914 RDI: 0000000000000006
[    8.894041][  T166] RBP: 00007ffd14042ba0 R08: 0000000000000000 R09: 0000000000000000
[    8.894235][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd14043088
[    8.894441][  T166] R13: 00007ffd14043110 R14: 0000000000000002 R15: 0000000000543540
| [   98.679594][  T166] ------------[ cut here ]------------
| [   98.679783][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [   98.680052][  T166] Modules linked in:
| [   98.680511][  T166] Tainted: [W]=WARN
[   98.680613][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.680784][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.680955][  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
[   98.681511][  T166] RSP: 0018:ffa00000008376f0 EFLAGS: 00010286
[   98.681777][  T166] RAX: 00000000ffffffa6 RBX: ff11000002994ac0 RCX: 1ff4000000106ea4
[   98.681973][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000002994b70
[   98.682166][  T166] RBP: ff11000012a10000 R08: 1fe220000053296f R09: ff11000012f72e58
[   98.682362][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000041
[   98.682613][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ffa0000000837790
[   98.682817][  T166] FS:  0000000000000000(0000) GS:ff1100008cd53000(0000) knlGS:0000000000000000
[   98.683045][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.683209][  T166] CR2: 0000564392bd6c30 CR3: 000000000df39006 CR4: 0000000000771ef0
[   98.683501][  T166] PKRU: 55555554
[   98.683601][  T166] Call Trace:
[   98.683703][  T166]  <TASK>
[   98.683780][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   98.683918][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   98.684021][  T166]  netif_close_many (net/core/dev.c:1804)
[   98.684152][  T166]  ? asym_cpu_capacity_scan (./include/linux/rculist.h:103)
[   98.684285][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.684504][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.684633][  T166]  ? __dev_close_many (net/core/dev.c:1781)
[   98.684767][  T166]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   98.684928][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   98.685092][  T166]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   98.685225][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.685443][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.685572][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.685702][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.685841][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.685975][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.686106][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.686238][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.686456][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.686591][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.686727][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.686863][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.686994][  T166]  __fput (fs/file_table.c:510)
[   98.687098][  T166]  task_work_run (kernel/task_work.c:233)
[   98.687229][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.687358][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.687580][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.687713][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.687823][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.687955][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.688086][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.688216][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.688348][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.688532][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.688696][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.688835][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.688964][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.689095][  T166]  get_signal (kernel/signal.c:3037)
[   98.689228][  T166]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.689361][  T166]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.689582][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.689715][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.689854][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.689987][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.690121][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.690287][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.690508][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.690643][  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)
[   98.690781][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.690914][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.691078][  T166] RIP: 0033:0x4c2d9e
[   98.691184][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.691523][  T166] RSP: 002b:00007ffd140424e0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.691731][  T166] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[   98.691932][  T166] RDX: 0000000000000014 RSI: 00007ffd140425c0 RDI: 0000000000000007
[   98.692128][  T166] RBP: 00007ffd140424f0 R08: 00007ffd14042580 R09: 000000000000000c
[   98.692330][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000031ac4c60
[   98.692623][  T166] R13: 00007ffd14043110 R14: 00007ffd140426b0 R15: 0000000000543540
| [   98.707003][  T166] ------------[ cut here ]------------
| [   98.707170][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [   98.707776][  T166] Modules linked in:
| [   98.708177][  T166] Tainted: [W]=WARN
[   98.708275][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.708440][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.708607][  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
[   98.709070][  T166] RSP: 0018:ffa0000000837820 EFLAGS: 00010286
[   98.709232][  T166] RAX: 00000000ffffffa6 RBX: ff110000029950c0 RCX: 1ff4000000106eca
[   98.709429][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000002995170
[   98.709621][  T166] RBP: ff11000012a10000 R08: 1fe2200000532a2f R09: ff11000012f72e58
[   98.709817][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[   98.710008][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.710198][  T166] FS:  0000000000000000(0000) GS:ff1100008cd53000(0000) knlGS:0000000000000000
[   98.710427][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.710585][  T166] CR2: 0000564392bd6c30 CR3: 000000000df39006 CR4: 0000000000771ef0
[   98.710784][  T166] PKRU: 55555554
[   98.710880][  T166] Call Trace:
[   98.710975][  T166]  <TASK>
[   98.711041][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.711203][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.711362][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.711493][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.711621][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.711753][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.711882][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.712009][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.712135][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.712262][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.712396][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.712547][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.712709][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.712857][  T166]  __fput (fs/file_table.c:510)
[   98.713007][  T166]  task_work_run (kernel/task_work.c:233)
[   98.713145][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.713299][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.713442][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.713573][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.713671][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.713804][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.713933][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.714060][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.714191][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.714319][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.714480][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.714607][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.714741][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.714868][  T166]  get_signal (kernel/signal.c:3037)
[   98.714998][  T166]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.715124][  T166]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.715254][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.715388][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.715520][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.715652][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.715815][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.715979][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.716106][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.716235][  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)
[   98.716363][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.716496][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.716654][  T166] RIP: 0033:0x4c2d9e
[   98.716764][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.716926][  T166] RSP: 002b:00007ffd140424e0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.717118][  T166] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[   98.717312][  T166] RDX: 0000000000000014 RSI: 00007ffd140425c0 RDI: 0000000000000007
[   98.717507][  T166] RBP: 00007ffd140424f0 R08: 00007ffd14042580 R09: 000000000000000c
[   98.717696][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000031ac4c60
[   98.717889][  T166] R13: 00007ffd14043110 R14: 00007ffd140426b0 R15: 0000000000543540
| [   98.742638][   T12] ------------[ cut here ]------------
| [   98.742853][   T12] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: 0/12
| [   98.743134][   T12] Modules linked in:
| [   98.743666][   T12] Tainted: [W]=WARN
[   98.743765][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.743915][   T12] Workqueue: netns cleanup_net
[   98.744050][   T12] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.744248][   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
[   98.744683][   T12] RSP: 0018:ffa00000000c7878 EFLAGS: 00010286
[   98.744839][   T12] RAX: 00000000ffffffa6 RBX: ff11000013348ac0 RCX: 1ff4000000018ed5
[   98.745034][   T12] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000013348b70
[   98.745214][   T12] RBP: ff11000008949000 R08: 1fe220000266916f R09: ff11000001afd1d0
[   98.745398][   T12] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   98.745579][   T12] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.745764][   T12] FS:  0000000000000000(0000) GS:ff1100008cbd3000(0000) knlGS:0000000000000000
[   98.745976][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.746127][   T12] CR2: 0000562e6dc952b8 CR3: 00000000140ee002 CR4: 0000000000771ef0
[   98.746306][   T12] PKRU: 55555554
[   98.746401][   T12] Call Trace:
[   98.746492][   T12]  <TASK>
[   98.746555][   T12]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.746710][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.746866][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   98.746987][   T12]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   98.747108][   T12]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   98.747226][   T12]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   98.747348][   T12]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   98.747471][   T12]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   98.747591][   T12]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   98.747713][   T12]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   98.747841][   T12]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   98.747963][   T12]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.748087][   T12]  cleanup_net (net/core/net_namespace.c:702)
[   98.748209][   T12]  ? net_passive_dec (./include/linux/llist.h:241)
[   98.748327][   T12]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   98.748468][   T12]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   98.748588][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.748715][   T12]  process_one_work (kernel/workqueue.c:3314)
[   98.749029][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   98.749149][   T12]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.749273][   T12]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   98.749405][   T12]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.749525][   T12]  kthread (kernel/kthread.c:436)
[   98.749618][   T12]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.749775][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[   98.749895][   T12]  ret_from_fork (arch/x86/kernel/process.c:158)
[   98.750017][   T12]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   98.750166][   T12]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   98.750287][   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