======================================
| xx__-> [    8.888134][  T166] ------------[ cut here ]------------
| [    8.888435][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: unshare/166
| [    8.888755][  T166] Modules linked in:
| [    8.889287][  T166] Tainted: [W]=WARN
[    8.889436][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.889678][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.889994][  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
[    8.890860][  T166] RSP: 0018:ffa0000000537ab0 EFLAGS: 00010286
[    8.891199][  T166] RAX: 00000000ffffffa6 RBX: ff11000004d0c4c0 RCX: 1ff40000000a6f1c
[    8.891515][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004d0c570
[    8.891761][  T166] RBP: ff11000008c09000 R08: 1fe22000009a18af R09: ff11000008ca0b80
[    8.892004][  T166] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[    8.892622][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000008c09000
[    8.892866][  T166] FS:  00007f934cb58740(0000) GS:ff1100007bed3000(0000) knlGS:0000000000000000
[    8.893184][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.893401][  T166] CR2: 0000556915590310 CR3: 00000000094b0001 CR4: 0000000000771ef0
[    8.893648][  T166] PKRU: 55555554
[    8.893792][  T166] Call Trace:
[    8.893939][  T166]  <TASK>
[    8.894054][  T166]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    8.894257][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.894440][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.894621][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.894768][  T166]  register_netdevice (net/core/dev.c:11488)
[    8.894949][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.895181][  T166]  register_netdev (net/core/dev.c:11552)
[    8.895363][  T166]  loopback_net_init (drivers/net/loopback.c:218)
[    8.895544][  T166]  ops_init (net/core/net_namespace.c:137)
[    8.895695][  T166]  setup_net (net/core/net_namespace.c:446)
[    8.895842][  T166]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    8.896018][  T166]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    8.896223][  T166]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    8.896408][  T166]  copy_net_ns (net/core/net_namespace.c:579)
[    8.896593][  T166]  create_new_namespaces (kernel/nsproxy.c:132)
[    8.896772][  T166]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    8.896954][  T166]  ksys_unshare (kernel/fork.c:3243)
[    8.897158][  T166]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    8.897349][  T166]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    8.897527][  T166]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    8.897710][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.897890][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.898069][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.898277][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.898488][  T166] RIP: 0033:0x7f934cc53bcb
[    8.898673][  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
[    8.899226][  T166] RSP: 002b:00007ffe65da5998 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    8.899471][  T166] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f934cc53bcb
[    8.899713][  T166] RDX: 0000000000000000 RSI: 00007ffe65da5700 RDI: 0000000040000000
[    8.899953][  T166] RBP: 00007ffe65da5d20 R08: 00007ffe65da58f0 R09: 0000000000000000
[    8.900217][  T166] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    8.900463][  T166] R13: 0000000000000000 R14: 00000000ffffffff R15: 0000556915593b68
| [    8.919260][  T166] ------------[ cut here ]------------
| [    8.919433][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/166
| [    8.919717][  T166] Modules linked in:
| [    8.920218][  T166] Tainted: [W]=WARN
[    8.920356][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.920552][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.920756][  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
[    8.921251][  T166] RSP: 0018:ffa0000000537b58 EFLAGS: 00010286
[    8.921449][  T166] RAX: 00000000ffffffa6 RBX: ff11000004d00340 RCX: 1ff40000000a6f31
[    8.921675][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004d003f0
[    8.921903][  T166] RBP: ff11000004ca0000 R08: 1fe22000009a007f R09: ff11000008ca0b58
[    8.922140][  T166] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[    8.922374][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000004ca0000
[    8.922602][  T166] FS:  000000003b57b400(0000) GS:ff1100007bed3000(0000) knlGS:0000000000000000
[    8.922861][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.923060][  T166] CR2: 00007fb9a7d71000 CR3: 0000000005b46002 CR4: 0000000000771ef0
[    8.923309][  T166] PKRU: 55555554
[    8.923446][  T166] Call Trace:
[    8.923582][  T166]  <TASK>
[    8.923691][  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))
[    8.923859][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.924029][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.924220][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.924364][  T166]  register_netdevice (net/core/dev.c:11488)
[    8.924534][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.924729][  T166]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    8.924899][  T166]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    8.925070][  T166]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    8.925310][  T166]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    8.925449][  T166]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    8.925617][  T166]  ? build_open_flags (fs/open.c:1212)
[    8.925789][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.925957][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    8.926140][  T166]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    8.926317][  T166]  ? fput_close_sync (fs/file_table.c:615)
[    8.926490][  T166]  ? __ia32_sys_open (fs/open.c:1374)
[    8.926659][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.926829][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.926996][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.927183][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.927355][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.927550][  T166] RIP: 0033:0x47cc8d
[    8.927693][  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 
[    8.928369][  T166] RSP: 002b:00007fff69418330 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.928691][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.929002][  T166] RDX: 00007fff694183b0 RSI: 00000000400454ca RDI: 0000000000000005
[    8.929257][  T166] RBP: 00007fff69418380 R08: 0000000000000000 R09: 0000000000000000
[    8.929483][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff69418888
[    8.929776][  T166] R13: 00007fff69418910 R14: 0000000000000002 R15: 0000000000543540
| [    8.931869][  T166] ------------[ cut here ]------------
| [    8.932030][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/166
| [    8.932331][  T166] Modules linked in:
| [    8.932789][  T166] Tainted: [W]=WARN
[    8.932924][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.933128][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.933341][  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
[    8.933810][  T166] RSP: 0018:ffa0000000537c58 EFLAGS: 00010286
[    8.934007][  T166] RAX: 00000000ffffffa6 RBX: ff11000004d00640 RCX: 1ff40000000a6f51
[    8.934252][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004d006f0
[    8.934474][  T166] RBP: ff11000004ca0000 R08: 1fe22000009a00df R09: ff11000008ca0b58
[    8.934701][  T166] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000000
[    8.934924][  T166] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000002
[    8.935165][  T166] FS:  000000003b57b400(0000) GS:ff1100007bed3000(0000) knlGS:0000000000000000
[    8.935421][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.935621][  T166] CR2: 00007fb9a7d71000 CR3: 0000000005b46002 CR4: 0000000000771ef0
[    8.935847][  T166] PKRU: 55555554
[    8.935982][  T166] Call Trace:
[    8.936128][  T166]  <TASK>
[    8.936246][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    8.936415][  T166]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    8.936583][  T166]  notifier_call_chain (kernel/notifier.c:85)
[    8.936753][  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)
[    8.936923][  T166]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    8.937131][  T166]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    8.937312][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.937479][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.937655][  T166]  ? update_socket_protocol+0x10/0x10
[    8.937887][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    8.938104][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.938287][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.938454][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.938620][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.938789][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.938983][  T166] RIP: 0033:0x47cc8d
[    8.939138][  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 
[    8.939619][  T166] RSP: 002b:00007fff69418370 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.939847][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.940071][  T166] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    8.940317][  T166] RBP: 00007fff694183c0 R08: 0000000000000000 R09: 0000000000000000
[    8.940546][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff69418888
[    8.940769][  T166] R13: 00007fff69418910 R14: 0000000000000002 R15: 0000000000543540
| [    8.942923][  T166] ------------[ cut here ]------------
| [    8.943106][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/166
| [    8.943514][  T166] Modules linked in:
| [    8.943999][  T166] Tainted: [W]=WARN
[    8.944166][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.944375][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.944589][  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
[    8.945103][  T166] RSP: 0018:ffa0000000537850 EFLAGS: 00010286
[    8.945320][  T166] RAX: 00000000ffffffa6 RBX: ff11000004d01b40 RCX: 1ff40000000a6ed0
[    8.945557][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004d01bf0
[    8.945828][  T166] RBP: ff11000004ca0000 R08: 1fe22000009a037f R09: ff11000008ca0b58
[    8.946064][  T166] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000001
[    8.946326][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff110000057f0900
[    8.946566][  T166] FS:  000000003b57b400(0000) GS:ff1100007bed3000(0000) knlGS:0000000000000000
[    8.946839][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.947046][  T166] CR2: 00007fb9a7d71000 CR3: 0000000005b46002 CR4: 0000000000771ef0
[    8.947308][  T166] PKRU: 55555554
[    8.947450][  T166] Call Trace:
[    8.947592][  T166]  <TASK>
[    8.947706][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.947884][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.948028][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    8.948225][  T166]  __dev_notify_flags (net/core/dev.c:9787)
[    8.948404][  T166]  ? netif_change_name (net/core/dev.c:1495)
[    8.948579][  T166]  ? __dev_change_flags (net/core/dev.c:9752)
[    8.948757][  T166]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    8.948933][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    8.949123][  T166]  netif_change_flags (net/core/dev.c:9820)
[    8.949306][  T166]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    8.949484][  T166]  dev_change_flags (net/core/dev_api.c:68)
[    8.949661][  T166]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    8.949839][  T166]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    8.950018][  T166]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    8.950218][  T166]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    8.950367][  T166]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    8.950542][  T166]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    8.950724][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.950901][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.951092][  T166]  sock_do_ioctl (net/socket.c:1313)
[    8.951279][  T166]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    8.951460][  T166]  ? ioctl_file_clone (fs/ioctl.c:244)
[    8.951638][  T166]  sock_ioctl (net/socket.c:1434)
[    8.951783][  T166]  ? br_ioctl_call (net/socket.c:1279)
[    8.951961][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.952162][  T166]  ? update_socket_protocol+0x10/0x10
[    8.952338][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    8.952517][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.952697][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.952871][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.953047][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.953244][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.953453][  T166] RIP: 0033:0x47cc8d
[    8.953601][  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 
[    8.954118][  T166] RSP: 002b:00007fff69418350 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.954369][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.954607][  T166] RDX: 00007fff694183c0 RSI: 0000000000008914 RDI: 0000000000000006
[    8.954844][  T166] RBP: 00007fff694183a0 R08: 0000000000000000 R09: 0000000000000000
[    8.955097][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff69418888
[    8.955345][  T166] R13: 00007fff69418910 R14: 0000000000000002 R15: 0000000000543540
| [   98.717804][  T166] ------------[ cut here ]------------
| [   98.718052][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/166
| [   98.718401][  T166] Modules linked in:
| [   98.718924][  T166] Tainted: [W]=WARN
[   98.719073][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.719477][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.719801][  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
[   98.720394][  T166] RSP: 0018:ffa00000005376f0 EFLAGS: 00010286
[   98.720726][  T166] RAX: 00000000ffffffa6 RBX: ff1100000c1a07c0 RCX: 1ff40000000a6ea4
[   98.721068][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000c1a0870
[   98.721381][  T166] RBP: ff11000004ca0000 R08: 1fe220000183410f R09: ff11000008ca0b58
[   98.721727][  T166] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000041
[   98.722063][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ffa0000000537790
[   98.722375][  T166] FS:  0000000000000000(0000) GS:ff1100007bed3000(0000) knlGS:0000000000000000
[   98.722720][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.722992][  T166] CR2: 00007f34c202b6f0 CR3: 000000000c536005 CR4: 0000000000771ef0
[   98.723270][  T166] PKRU: 55555554
[   98.723424][  T166] Call Trace:
[   98.723572][  T166]  <TASK>
[   98.723689][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   98.723877][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   98.724027][  T166]  netif_close_many (net/core/dev.c:1804)
[   98.724222][  T166]  ? asym_cpu_capacity_scan (./include/linux/rculist.h:103)
[   98.724407][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.724597][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.724781][  T166]  ? __dev_close_many (net/core/dev.c:1781)
[   98.724964][  T166]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   98.725196][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   98.725413][  T166]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   98.725602][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.725816][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.725998][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.726190][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.726372][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.726564][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.726747][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.726926][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.727120][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.727305][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.727498][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.727687][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.727868][  T166]  __fput (fs/file_table.c:510)
[   98.728021][  T166]  task_work_run (kernel/task_work.c:233)
[   98.728216][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.728398][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.728586][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.728768][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.728919][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.729110][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.729294][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.729483][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.729668][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.729847][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.730057][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.730252][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.730441][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.730624][  T166]  get_signal (kernel/signal.c:3037)
[   98.730809][  T166]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.730991][  T166]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.731272][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[   98.731465][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.731649][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.731835][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.732118][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.732299][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.732520][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.732704][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.732889][  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)
[   98.733070][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.733287][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.733515][  T166] RIP: 0033:0x4c2d9e
[   98.733794][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.734172][  T166] RSP: 002b:00007fff69417ce0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.734549][  T166] RAX: 0000000000000014 RBX: 0000000000000012 RCX: 00000000004c2d9e
[   98.734816][  T166] RDX: 0000000000000014 RSI: 00007fff69417dc0 RDI: 0000000000000007
[   98.735060][  T166] RBP: 00007fff69417cf0 R08: 00007fff69417d80 R09: 000000000000000c
[   98.735319][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff69418888
[   98.735572][  T166] R13: 00007fff69418910 R14: 00007fff69417eb0 R15: 0000000000543540
| [   98.748311][  T166] ------------[ cut here ]------------
| [   98.748499][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/166
| [   98.748802][  T166] Modules linked in:
| [   98.749303][  T166] Tainted: [W]=WARN
[   98.749455][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.749662][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.749876][  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
[   98.750918][  T166] RSP: 0018:ffa0000000537820 EFLAGS: 00010286
[   98.751221][  T166] RAX: 00000000ffffffa6 RBX: ff1100000c1a1840 RCX: 1ff40000000a6eca
[   98.751462][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000c1a18f0
[   98.751699][  T166] RBP: ff11000004ca0000 R08: 1fe220000183431f R09: ff11000008ca0b58
[   98.751935][  T166] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[   98.752209][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.752451][  T166] FS:  0000000000000000(0000) GS:ff1100007bed3000(0000) knlGS:0000000000000000
[   98.752719][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.752926][  T166] CR2: 00007f34c202b6f0 CR3: 0000000012b39004 CR4: 0000000000771ef0
[   98.753174][  T166] PKRU: 55555554
[   98.753314][  T166] Call Trace:
[   98.753462][  T166]  <TASK>
[   98.753576][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.753784][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.753988][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.754175][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.754347][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.754526][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.754701][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.754875][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.755047][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.755231][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.755403][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.755586][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.755764][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.755937][  T166]  __fput (fs/file_table.c:510)
[   98.756095][  T166]  task_work_run (kernel/task_work.c:233)
[   98.756269][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.756449][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.756625][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.756800][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.756942][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.757126][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.757302][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.757482][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.757657][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.757829][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.758032][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.758217][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.758390][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.758569][  T166]  get_signal (kernel/signal.c:3037)
[   98.758743][  T166]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.758915][  T166]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.759100][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[   98.759275][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.759457][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.759633][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.759809][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.759982][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.760201][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.760373][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.760555][  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)
[   98.760728][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.760900][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.761117][  T166] RIP: 0033:0x4c2d9e
[   98.761264][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.761479][  T166] RSP: 002b:00007fff69417ce0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.761715][  T166] RAX: 0000000000000014 RBX: 0000000000000012 RCX: 00000000004c2d9e
[   98.761948][  T166] RDX: 0000000000000014 RSI: 00007fff69417dc0 RDI: 0000000000000007
[   98.762189][  T166] RBP: 00007fff69417cf0 R08: 00007fff69417d80 R09: 000000000000000c
[   98.762426][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff69418888
[   98.762658][  T166] R13: 00007fff69418910 R14: 00007fff69417eb0 R15: 0000000000543540
| [   98.788359][   T70] ------------[ cut here ]------------
| [   98.788563][   T70] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: 1/70
| [   98.788819][   T70] Modules linked in:
| [   98.789247][   T70] Tainted: [W]=WARN
[   98.789336][   T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.789487][   T70] Workqueue: netns cleanup_net
[   98.789616][   T70] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.789770][   T70] 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
[   98.790199][   T70] RSP: 0018:ffa00000004b7878 EFLAGS: 00010286
[   98.790347][   T70] RAX: 00000000ffffffa6 RBX: ff1100000c1a0640 RCX: 1ff4000000096ed5
[   98.790533][   T70] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000c1a06f0
[   98.790712][   T70] RBP: ff11000008c09000 R08: 1fe22000018340df R09: ff11000008c40bd0
[   98.790885][   T70] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   98.791085][   T70] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.791261][   T70] FS:  0000000000000000(0000) GS:ff1100007bdd3000(0000) knlGS:0000000000000000
[   98.791470][   T70] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.791616][   T70] CR2: 00007f0655f8d770 CR3: 0000000012b39005 CR4: 0000000000771ef0
[   98.791790][   T70] PKRU: 55555554
[   98.791878][   T70] Call Trace:
[   98.791966][   T70]  <TASK>
[   98.792027][   T70]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.792180][   T70]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.792326][   T70]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   98.792449][   T70]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   98.792567][   T70]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   98.792682][   T70]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   98.792801][   T70]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   98.792917][   T70]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   98.793033][   T70]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   98.793160][   T70]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   98.793279][   T70]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   98.793396][   T70]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.793525][   T70]  cleanup_net (net/core/net_namespace.c:702)
[   98.793644][   T70]  ? net_passive_dec (./include/linux/llist.h:241)
[   98.793760][   T70]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   98.793877][   T70]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   98.793994][   T70]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.794119][   T70]  process_one_work (kernel/workqueue.c:3314)
[   98.794240][   T70]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   98.794356][   T70]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.794483][   T70]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   98.794603][   T70]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.794721][   T70]  ? __kthread_parkme (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 kernel/kthread.c:272)
[   98.794843][   T70]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.794960][   T70]  kthread (kernel/kthread.c:436)
[   98.795048][   T70]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.795199][   T70]  ? kthread_affine_node (kernel/kthread.c:378)
[   98.795317][   T70]  ret_from_fork (arch/x86/kernel/process.c:158)
[   98.795439][   T70]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   98.795586][   T70]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   98.795703][   T70]  ? 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