======================================
| xx__-> [    8.652244][  T166] ------------[ cut here ]------------
| [    8.652450][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: unshare/166
| [    8.652727][  T166] Modules linked in:
| [    8.653180][  T166] Tainted: [W]=WARN
[    8.653288][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.653458][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.653634][  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
[    8.654128][  T166] RSP: 0018:ffa0000000847ab0 EFLAGS: 00010286
[    8.654299][  T166] RAX: 00000000ffffffa6 RBX: ff1100000bf78940 RCX: 1ff4000000108f1c
[    8.654507][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000bf789f0
[    8.654712][  T166] RBP: ff1100000963c000 R08: 1fe22000017ef13f R09: ff1100000c550b80
[    8.654921][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[    8.655126][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000963c000
[    8.655375][  T166] FS:  00007f4e837ac740(0000) GS:ff110000a3d53000(0000) knlGS:0000000000000000
[    8.655611][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.655781][  T166] CR2: 000056356a564310 CR3: 000000000c9a4001 CR4: 0000000000771ef0
[    8.656012][  T166] PKRU: 55555554
[    8.656115][  T166] Call Trace:
[    8.656217][  T166]  <TASK>
[    8.656290][  T166]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    8.656427][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.656564][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.656701][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.656808][  T166]  register_netdevice (net/core/dev.c:11488)
[    8.656962][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.657134][  T166]  register_netdev (net/core/dev.c:11552)
[    8.657269][  T166]  loopback_net_init (drivers/net/loopback.c:218)
[    8.657405][  T166]  ops_init (net/core/net_namespace.c:137)
[    8.657511][  T166]  setup_net (net/core/net_namespace.c:446)
[    8.657613][  T166]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    8.657748][  T166]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    8.657950][  T166]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    8.658089][  T166]  copy_net_ns (net/core/net_namespace.c:579)
[    8.658225][  T166]  create_new_namespaces (kernel/nsproxy.c:132)
[    8.658360][  T166]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    8.658496][  T166]  ksys_unshare (kernel/fork.c:3243)
[    8.658633][  T166]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    8.658772][  T166]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    8.658968][  T166]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    8.659105][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.659240][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.659376][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.659523][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.659691][  T166] RIP: 0033:0x7f4e838a7bcb
[    8.659832][  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
[    8.660373][  T166] RSP: 002b:00007fff5c978a28 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    8.660578][  T166] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4e838a7bcb
[    8.660780][  T166] RDX: 0000000000000000 RSI: 00007fff5c978790 RDI: 0000000040000000
[    8.661045][  T166] RBP: 00007fff5c978db0 R08: 00007fff5c978980 R09: 0000000000000000
[    8.661247][  T166] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    8.661448][  T166] R13: 0000000000000000 R14: 00000000ffffffff R15: 000056356a567b68
| [    8.686218][  T166] ------------[ cut here ]------------
| [    8.686381][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [    8.686634][  T166] Modules linked in:
| [    8.687029][  T166] Tainted: [W]=WARN
[    8.687124][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.687280][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.687441][  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
[    8.687886][  T166] RSP: 0018:ffa0000000847b58 EFLAGS: 00010286
[    8.688046][  T166] RAX: 00000000ffffffa6 RBX: ff1100000bf9e4c0 RCX: 1ff4000000108f31
[    8.688229][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000bf9e570
[    8.688413][  T166] RBP: ff1100000bc18000 R08: 1fe22000017f3caf R09: ff1100000c550b58
[    8.688608][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[    8.688791][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000bc18000
[    8.688988][  T166] FS:  000000003db41400(0000) GS:ff110000a3d53000(0000) knlGS:0000000000000000
[    8.689204][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.689361][  T166] CR2: 00007fac36d95000 CR3: 0000000009232002 CR4: 0000000000771ef0
[    8.689550][  T166] PKRU: 55555554
[    8.689643][  T166] Call Trace:
[    8.689733][  T166]  <TASK>
[    8.689796][  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))
[    8.689923][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.690054][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.690184][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.690280][  T166]  register_netdevice (net/core/dev.c:11488)
[    8.690406][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.690557][  T166]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    8.690684][  T166]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    8.690811][  T166]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    8.690947][  T166]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    8.691076][  T166]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    8.691204][  T166]  ? build_open_flags (fs/open.c:1212)
[    8.691327][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.691448][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    8.691572][  T166]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    8.691693][  T166]  ? fput_close_sync (fs/file_table.c:615)
[    8.691815][  T166]  ? __ia32_sys_open (fs/open.c:1374)
[    8.691948][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.692072][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.692196][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.692316][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.692436][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.692586][  T166] RIP: 0033:0x47cc8d
[    8.692683][  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 
[    8.693127][  T166] RSP: 002b:00007ffd775eb460 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.693310][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.693490][  T166] RDX: 00007ffd775eb4e0 RSI: 00000000400454ca RDI: 0000000000000005
[    8.693672][  T166] RBP: 00007ffd775eb4b0 R08: 0000000000000000 R09: 0000000000000000
[    8.693853][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd775eb9b8
[    8.694042][  T166] R13: 00007ffd775eba40 R14: 0000000000000002 R15: 0000000000543540
| [    8.695655][  T166] ------------[ cut here ]------------
| [    8.695774][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [    8.696017][  T166] Modules linked in:
| [    8.696381][  T166] Tainted: [W]=WARN
[    8.696472][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.696622][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.696777][  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
[    8.697208][  T166] RSP: 0018:ffa0000000847c58 EFLAGS: 00010286
[    8.697360][  T166] RAX: 00000000ffffffa6 RBX: ff1100000bf9e340 RCX: 1ff4000000108f51
[    8.697538][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000bf9e3f0
[    8.697716][  T166] RBP: ff1100000bc18000 R08: 1fe22000017f3c7f R09: ff1100000c550b58
[    8.697905][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
[    8.698088][  T166] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000003
[    8.698275][  T166] FS:  000000003db41400(0000) GS:ff110000a3d53000(0000) knlGS:0000000000000000
[    8.698484][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.698634][  T166] CR2: 00007fac36d95000 CR3: 0000000009232002 CR4: 0000000000771ef0
[    8.698815][  T166] PKRU: 55555554
[    8.698912][  T166] Call Trace:
[    8.699004][  T166]  <TASK>
[    8.699065][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    8.699188][  T166]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    8.699312][  T166]  notifier_call_chain (kernel/notifier.c:85)
[    8.699434][  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)
[    8.699554][  T166]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    8.699704][  T166]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    8.699827][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.699954][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.700076][  T166]  ? update_socket_protocol+0x10/0x10
[    8.700197][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    8.700327][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.700450][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.700572][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.700693][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.700816][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.700975][  T166] RIP: 0033:0x47cc8d
[    8.701071][  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 
[    8.701496][  T166] RSP: 002b:00007ffd775eb4a0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.701680][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.701859][  T166] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    8.702047][  T166] RBP: 00007ffd775eb4f0 R08: 0000000000000005 R09: 0000000000001ff0
[    8.702226][  T166] R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffd775eb9b8
[    8.702489][  T166] R13: 00007ffd775eba40 R14: 0000000000000002 R15: 0000000000543540
| [    8.704374][  T166] ------------[ cut here ]------------
| [    8.704498][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [    8.704750][  T166] Modules linked in:
| [    8.705238][  T166] Tainted: [W]=WARN
[    8.705336][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.705583][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.705748][  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
[    8.706294][  T166] RSP: 0018:ffa0000000847850 EFLAGS: 00010286
[    8.706454][  T166] RAX: 00000000ffffffa6 RBX: ff1100000bf9ef40 RCX: 1ff4000000108ed0
[    8.706728][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000bf9eff0
[    8.706922][  T166] RBP: ff1100000bc18000 R08: 1fe22000017f3dff R09: ff1100000c550b58
[    8.707114][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000001
[    8.707388][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000005910900
[    8.707580][  T166] FS:  000000003db41400(0000) GS:ff110000a3d53000(0000) knlGS:0000000000000000
[    8.707892][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.708058][  T166] CR2: 00007fac36d95000 CR3: 0000000009232002 CR4: 0000000000771ef0
[    8.708251][  T166] PKRU: 55555554
[    8.708346][  T166] Call Trace:
[    8.708524][  T166]  <TASK>
[    8.708594][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.708724][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.708821][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    8.708955][  T166]  __dev_notify_flags (net/core/dev.c:9787)
[    8.709166][  T166]  ? netif_change_name (net/core/dev.c:1495)
[    8.709293][  T166]  ? __dev_change_flags (net/core/dev.c:9752)
[    8.709420][  T166]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    8.709549][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    8.709761][  T166]  netif_change_flags (net/core/dev.c:9820)
[    8.709891][  T166]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    8.710024][  T166]  dev_change_flags (net/core/dev_api.c:68)
[    8.710152][  T166]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    8.710364][  T166]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    8.710491][  T166]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    8.710621][  T166]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    8.710719][  T166]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    8.710947][  T166]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    8.711080][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.711208][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.711338][  T166]  sock_do_ioctl (net/socket.c:1313)
[    8.711549][  T166]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    8.711680][  T166]  ? ioctl_file_clone (fs/ioctl.c:244)
[    8.711810][  T166]  sock_ioctl (net/socket.c:1434)
[    8.711916][  T166]  ? br_ioctl_call (net/socket.c:1279)
[    8.712134][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.712267][  T166]  ? update_socket_protocol+0x10/0x10
[    8.712392][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    8.712521][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.712732][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.712858][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.712994][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.713120][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.713358][  T166] RIP: 0033:0x47cc8d
[    8.713457][  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 
[    8.714000][  T166] RSP: 002b:00007ffd775eb480 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.714191][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.714379][  T166] RDX: 00007ffd775eb4f0 RSI: 0000000000008914 RDI: 0000000000000006
[    8.714651][  T166] RBP: 00007ffd775eb4d0 R08: 0000000000000005 R09: 0000000000001ff0
[    8.714841][  T166] R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffd775eb9b8
[    8.715130][  T166] R13: 00007ffd775eba40 R14: 0000000000000002 R15: 0000000000543540
| [   98.517158][  T166] ------------[ cut here ]------------
| [   98.517354][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [   98.517621][  T166] Modules linked in:
| [   98.518118][  T166] Tainted: [W]=WARN
[   98.518218][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.518386][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.518558][  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
[   98.519097][  T166] RSP: 0018:ffa00000008476f0 EFLAGS: 00010286
[   98.519269][  T166] RAX: 00000000ffffffa6 RBX: ff1100000502a1c0 RCX: 1ff4000000108ea4
[   98.519462][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000502a270
[   98.519658][  T166] RBP: ff1100000bc18000 R08: 1fe2200000a0544f R09: ff1100000c550b58
[   98.519853][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000041
[   98.520136][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ffa0000000847790
[   98.520338][  T166] FS:  0000000000000000(0000) GS:ff110000a3d53000(0000) knlGS:0000000000000000
[   98.520568][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.520732][  T166] CR2: 00005563aaa441a0 CR3: 000000002b339005 CR4: 0000000000771ef0
[   98.521008][  T166] PKRU: 55555554
[   98.521172][  T166] Call Trace:
[   98.521276][  T166]  <TASK>
[   98.521346][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   98.521480][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   98.521581][  T166]  netif_close_many (net/core/dev.c:1804)
[   98.521712][  T166]  ? asym_cpu_capacity_scan (./include/linux/rculist.h:103)
[   98.521844][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.522068][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.522198][  T166]  ? __dev_close_many (net/core/dev.c:1781)
[   98.522332][  T166]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   98.522495][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   98.522659][  T166]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   98.522791][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.523007][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.523136][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.523270][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.523401][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.523534][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.523665][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.523795][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.523982][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.524116][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.524255][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.524385][  T166]  __fput (fs/file_table.c:510)
[   98.524491][  T166]  task_work_run (kernel/task_work.c:233)
[   98.524621][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.524752][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.524936][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.525068][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.525171][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.525306][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.525437][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.525571][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.525703][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.525833][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.526050][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.526180][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.526316][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.526445][  T166]  get_signal (kernel/signal.c:3037)
[   98.526579][  T166]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.526709][  T166]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.526844][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.527033][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.527166][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.527303][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.527435][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.527599][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.527731][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.527860][  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)
[   98.528079][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.528214][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.528380][  T166] RIP: 0033:0x4c2d9e
[   98.528487][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.528671][  T166] RSP: 002b:00007ffd775eae10 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.528872][  T166] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[   98.529156][  T166] RDX: 0000000000000014 RSI: 00007ffd775eaef0 RDI: 0000000000000007
[   98.529358][  T166] RBP: 00007ffd775eae20 R08: 00007ffd775eaeb0 R09: 000000000000000c
[   98.529555][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 000000003db4ccf0
[   98.529752][  T166] R13: 00007ffd775eba40 R14: 00007ffd775eafe0 R15: 0000000000543540
| [   98.538502][  T166] ------------[ cut here ]------------
| [   98.538654][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/166
| [   98.538920][  T166] Modules linked in:
| [   98.539321][  T166] Tainted: [W]=WARN
[   98.539418][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.539578][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.539745][  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
[   98.540206][  T166] RSP: 0018:ffa0000000847820 EFLAGS: 00010286
[   98.540369][  T166] RAX: 00000000ffffffa6 RBX: ff1100000502af40 RCX: 1ff4000000108eca
[   98.540560][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000502aff0
[   98.540753][  T166] RBP: ff1100000bc18000 R08: 1fe2200000a055ff R09: ff1100000c550b58
[   98.540950][  T166] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[   98.541139][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.541334][  T166] FS:  0000000000000000(0000) GS:ff110000a3d53000(0000) knlGS:0000000000000000
[   98.541557][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.541719][  T166] CR2: 00005563aaa441a0 CR3: 000000002b339005 CR4: 0000000000771ef0
[   98.541914][  T166] PKRU: 55555554
[   98.542009][  T166] Call Trace:
[   98.542106][  T166]  <TASK>
[   98.542173][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.542341][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.542499][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.542630][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.542757][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.542890][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.543020][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.543149][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.543278][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.543408][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.543538][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.543668][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.543797][  T166]  __fput (fs/file_table.c:510)
[   98.543902][  T166]  task_work_run (kernel/task_work.c:233)
[   98.544028][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.544156][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.544290][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.544419][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.544516][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.544642][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.544771][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.544904][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.545033][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.545159][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.545320][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.545446][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.545574][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.545701][  T166]  get_signal (kernel/signal.c:3037)
[   98.545831][  T166]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.545963][  T166]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.546089][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.546220][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.546353][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.546484][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.546611][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.546769][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.546903][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.547031][  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)
[   98.547159][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.547292][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.547448][  T166] RIP: 0033:0x4c2d9e
[   98.547550][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.547715][  T166] RSP: 002b:00007ffd775eae10 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.547909][  T166] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[   98.548097][  T166] RDX: 0000000000000014 RSI: 00007ffd775eaef0 RDI: 0000000000000007
[   98.548290][  T166] RBP: 00007ffd775eae20 R08: 00007ffd775eaeb0 R09: 000000000000000c
[   98.548481][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 000000003db4ccf0
[   98.548672][  T166] R13: 00007ffd775eba40 R14: 00007ffd775eafe0 R15: 0000000000543540
| [   98.566479][   T12] ------------[ cut here ]------------
| [   98.566651][   T12] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: 0/12
| [   98.567378][   T12] Modules linked in:
| [   98.567901][   T12] Tainted: [W]=WARN
[   98.568003][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.568152][   T12] Workqueue: netns cleanup_net
[   98.568296][   T12] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.568452][   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
[   98.568871][   T12] RSP: 0018:ffa00000000c7878 EFLAGS: 00010286
[   98.569101][   T12] RAX: 00000000ffffffa6 RBX: ff1100000502be40 RCX: 1ff4000000018ed5
[   98.569284][   T12] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000502bef0
[   98.569467][   T12] RBP: ff1100000963c000 R08: 1fe2200000a057df R09: ff11000001afd1d0
[   98.569642][   T12] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   98.569818][   T12] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.570071][   T12] FS:  0000000000000000(0000) GS:ff110000a3bd3000(0000) knlGS:0000000000000000
[   98.570282][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.570431][   T12] CR2: 00007f0216d03f98 CR3: 000000002b339005 CR4: 0000000000771ef0
[   98.570613][   T12] PKRU: 55555554
[   98.570701][   T12] Call Trace:
[   98.570789][   T12]  <TASK>
[   98.570852][   T12]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.571157][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.571311][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   98.571433][   T12]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   98.571554][   T12]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   98.571672][   T12]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   98.571791][   T12]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   98.571997][   T12]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   98.572114][   T12]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   98.572239][   T12]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   98.572360][   T12]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   98.572477][   T12]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.572597][   T12]  cleanup_net (net/core/net_namespace.c:702)
[   98.572715][   T12]  ? net_passive_dec (./include/linux/llist.h:241)
[   98.572833][   T12]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   98.573041][   T12]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   98.573158][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.573286][   T12]  process_one_work (kernel/workqueue.c:3314)
[   98.573408][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   98.573526][   T12]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.573648][   T12]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   98.573770][   T12]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.573973][   T12]  kthread (kernel/kthread.c:436)
[   98.574062][   T12]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.574210][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[   98.574331][   T12]  ret_from_fork (arch/x86/kernel/process.c:158)
[   98.574450][   T12]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   98.574597][   T12]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   98.574725][   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