======================================
| xx__-> [    8.924270][  T166] ------------[ cut here ]------------
| [    8.924548][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: unshare/166
| [    8.924925][  T166] Modules linked in:
| [    8.925470][  T166] Tainted: [W]=WARN
[    8.925626][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.925848][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.926133][  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
[    8.926673][  T166] RSP: 0018:ffa0000000827ab0 EFLAGS: 00010286
[    8.926895][  T166] RAX: 00000000ffffffa6 RBX: ff110000093784c0 RCX: 1ff4000000104f1c
[    8.927158][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009378570
[    8.927409][  T166] RBP: ff1100000a191000 R08: 1fe220000126f0af R09: ff1100000c665180
[    8.927674][  T166] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[    8.927927][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000a191000
[    8.928198][  T166] FS:  00007f6053280740(0000) GS:ff110000ac0d3000(0000) knlGS:0000000000000000
[    8.928502][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.928726][  T166] CR2: 0000563aeb993310 CR3: 000000000c111004 CR4: 0000000000771ef0
[    8.928991][  T166] PKRU: 55555554
[    8.929145][  T166] Call Trace:
[    8.929297][  T166]  <TASK>
[    8.929428][  T166]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    8.929618][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.929805][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.930011][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.930167][  T166]  register_netdevice (net/core/dev.c:11488)
[    8.930356][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.930596][  T166]  register_netdev (net/core/dev.c:11552)
[    8.930793][  T166]  loopback_net_init (drivers/net/loopback.c:218)
[    8.930992][  T166]  ops_init (net/core/net_namespace.c:137)
[    8.931150][  T166]  setup_net (net/core/net_namespace.c:446)
[    8.931304][  T166]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    8.931500][  T166]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    8.931689][  T166]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    8.931876][  T166]  copy_net_ns (net/core/net_namespace.c:579)
[    8.932081][  T166]  create_new_namespaces (kernel/nsproxy.c:132)
[    8.932269][  T166]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    8.932468][  T166]  ksys_unshare (kernel/fork.c:3243)
[    8.932657][  T166]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    8.932847][  T166]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    8.933045][  T166]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    8.933231][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.933428][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.933619][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.933807][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.934038][  T166] RIP: 0033:0x7f605337bbcb
[    8.934231][  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
[    8.934771][  T166] RSP: 002b:00007ffd6a4b9e48 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    8.935039][  T166] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f605337bbcb
[    8.935290][  T166] RDX: 0000000000000000 RSI: 00007ffd6a4b9bb0 RDI: 0000000040000000
[    8.935555][  T166] RBP: 00007ffd6a4ba1d0 R08: 00007ffd6a4b9da0 R09: 0000000000000000
[    8.935808][  T166] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    8.936072][  T166] R13: 0000000000000000 R14: 00000000ffffffff R15: 0000563aeb996b68
| [    8.955278][  T166] ------------[ cut here ]------------
| [    8.955479][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/166
| [    8.955776][  T166] Modules linked in:
| [    8.956268][  T166] Tainted: [W]=WARN
[    8.956422][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.956631][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.956846][  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
[    8.957739][  T166] RSP: 0018:ffa0000000827b58 EFLAGS: 00010286
[    8.957958][  T166] RAX: 00000000ffffffa6 RBX: ff11000004b34c40 RCX: 1ff4000000104f31
[    8.958191][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004b34cf0
[    8.958433][  T166] RBP: ff1100000b32c000 R08: 1fe220000096699f R09: ff1100000c665158
[    8.958667][  T166] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[    8.958899][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000b32c000
[    8.959142][  T166] FS:  000000001f0cc400(0000) GS:ff110000ac0d3000(0000) knlGS:0000000000000000
[    8.959420][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.959629][  T166] CR2: 00007f8b95229000 CR3: 000000000c11d005 CR4: 0000000000771ef0
[    8.959864][  T166] PKRU: 55555554
[    8.960016][  T166] Call Trace:
[    8.960160][  T166]  <TASK>
[    8.960275][  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))
[    8.960461][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.960640][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.960817][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.960976][  T166]  register_netdevice (net/core/dev.c:11488)
[    8.961152][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.961355][  T166]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    8.961549][  T166]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    8.961732][  T166]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    8.961908][  T166]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    8.962068][  T166]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    8.962243][  T166]  ? build_open_flags (fs/open.c:1212)
[    8.962430][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.962608][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    8.962784][  T166]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    8.962971][  T166]  ? fput_close_sync (fs/file_table.c:615)
[    8.963150][  T166]  ? __ia32_sys_open (fs/open.c:1374)
[    8.963327][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.963522][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.963697][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.963872][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.964061][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.964266][  T166] RIP: 0033:0x47cc8d
[    8.964424][  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 
[    8.964915][  T166] RSP: 002b:00007ffec13b5b60 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.965163][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.965398][  T166] RDX: 00007ffec13b5be0 RSI: 00000000400454ca RDI: 0000000000000005
[    8.965647][  T166] RBP: 00007ffec13b5bb0 R08: 0000000000000000 R09: 0000000000000000
[    8.965883][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffec13b60b8
[    8.966129][  T166] R13: 00007ffec13b6140 R14: 0000000000000002 R15: 0000000000543540
| [    8.974340][  T166] ------------[ cut here ]------------
| [    8.974524][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/166
| [    8.974817][  T166] Modules linked in:
| [    8.975351][  T166] Tainted: [W]=WARN
[    8.975508][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.975711][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.975921][  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
[    8.976428][  T166] RSP: 0018:ffa0000000827c58 EFLAGS: 00010286
[    8.976635][  T166] RAX: 00000000ffffffa6 RBX: ff11000004b353c0 RCX: 1ff4000000104f51
[    8.976865][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004b35470
[    8.977572][  T166] RBP: ff1100000b32c000 R08: 1fe2200000966a8f R09: ff1100000c665158
[    8.978277][  T166] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000000
[    8.978983][  T166] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000002
[    8.979294][  T166] FS:  000000001f0cc400(0000) GS:ff110000ac0d3000(0000) knlGS:0000000000000000
[    8.979571][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.979778][  T166] CR2: 00007f8b95229000 CR3: 000000000c11d005 CR4: 0000000000771ef0
[    8.980054][  T166] PKRU: 55555554
[    8.980196][  T166] Call Trace:
[    8.980338][  T166]  <TASK>
[    8.980467][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    8.980642][  T166]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    8.980823][  T166]  notifier_call_chain (kernel/notifier.c:85)
[    8.981012][  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)
[    8.981189][  T166]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    8.981392][  T166]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    8.981583][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.981758][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.981947][  T166]  ? update_socket_protocol+0x10/0x10
[    8.982120][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    8.982296][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.982493][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.982666][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.982840][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.983027][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.983227][  T166] RIP: 0033:0x47cc8d
[    8.983375][  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 
[    8.983866][  T166] RSP: 002b:00007ffec13b5ba0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.984112][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.984341][  T166] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    8.984587][  T166] RBP: 00007ffec13b5bf0 R08: 0000000000000005 R09: 0000000000001ff0
[    8.984818][  T166] R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffec13b60b8
[    8.985063][  T166] R13: 00007ffec13b6140 R14: 0000000000000002 R15: 0000000000543540
| [    8.987258][  T166] ------------[ cut here ]------------
| [    8.987440][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/166
| [    8.987745][  T166] Modules linked in:
| [    8.988252][  T166] Tainted: [W]=WARN
[    8.988400][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.988628][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.988848][  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
[    8.989372][  T166] RSP: 0018:ffa0000000827850 EFLAGS: 00010286
[    8.989598][  T166] RAX: 00000000ffffffa6 RBX: ff11000004b344c0 RCX: 1ff4000000104ed0
[    8.989841][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004b34570
[    8.990097][  T166] RBP: ff1100000b32c000 R08: 1fe22000009668af R09: ff1100000c665158
[    8.990345][  T166] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000001
[    8.990602][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff110000057f8900
[    8.990848][  T166] FS:  000000001f0cc400(0000) GS:ff110000ac0d3000(0000) knlGS:0000000000000000
[    8.991138][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.991352][  T166] CR2: 00007f8b95229000 CR3: 000000000c11d005 CR4: 0000000000771ef0
[    8.991615][  T166] PKRU: 55555554
[    8.991765][  T166] Call Trace:
[    8.991914][  T166]  <TASK>
[    8.992045][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.992229][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.992380][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    8.992570][  T166]  __dev_notify_flags (net/core/dev.c:9787)
[    8.992753][  T166]  ? netif_change_name (net/core/dev.c:1495)
[    8.992949][  T166]  ? __dev_change_flags (net/core/dev.c:9752)
[    8.993130][  T166]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    8.993313][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    8.993510][  T166]  netif_change_flags (net/core/dev.c:9820)
[    8.993691][  T166]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    8.993874][  T166]  dev_change_flags (net/core/dev_api.c:68)
[    8.994069][  T166]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    8.994256][  T166]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    8.994445][  T166]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    8.994630][  T166]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    8.994781][  T166]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    8.994974][  T166]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    8.995161][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.995344][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.995541][  T166]  sock_do_ioctl (net/socket.c:1313)
[    8.995724][  T166]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    8.995907][  T166]  ? ioctl_file_clone (fs/ioctl.c:244)
[    8.996104][  T166]  sock_ioctl (net/socket.c:1434)
[    8.996255][  T166]  ? br_ioctl_call (net/socket.c:1279)
[    8.996444][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.996631][  T166]  ? update_socket_protocol+0x10/0x10
[    8.996811][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    8.997012][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.997194][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.997375][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.997565][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.997749][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.997973][  T166] RIP: 0033:0x47cc8d
[    8.998126][  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 
[    8.998650][  T166] RSP: 002b:00007ffec13b5b80 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.998897][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.999151][  T166] RDX: 00007ffec13b5bf0 RSI: 0000000000008914 RDI: 0000000000000006
[    8.999398][  T166] RBP: 00007ffec13b5bd0 R08: 0000000000000005 R09: 0000000000001ff0
[    8.999659][  T166] R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffec13b60b8
[    8.999904][  T166] R13: 00007ffec13b6140 R14: 0000000000000002 R15: 0000000000543540
| [   98.764073][  T166] ------------[ cut here ]------------
| [   98.764375][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/166
| [   98.764832][  T166] Modules linked in:
| [   98.766517][  T166] Tainted: [W]=WARN
[   98.766690][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.767874][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.768187][  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
[   98.769004][  T166] RSP: 0018:ffa00000008276f0 EFLAGS: 00010286
[   98.769299][  T166] RAX: 00000000ffffffa6 RBX: ff11000004b35cc0 RCX: 1ff4000000104ea4
[   98.769625][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004b35d70
[   98.769973][  T166] RBP: ff1100000b32c000 R08: 1fe2200000966baf R09: ff1100000c665158
[   98.770315][  T166] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000041
[   98.770657][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ffa0000000827790
[   98.771010][  T166] FS:  0000000000000000(0000) GS:ff110000abfd3000(0000) knlGS:0000000000000000
[   98.771412][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.771697][  T166] CR2: 00007f5d282736f0 CR3: 0000000021d39001 CR4: 0000000000771ef0
[   98.772048][  T166] PKRU: 55555554
[   98.772223][  T166] Call Trace:
[   98.772392][  T166]  <TASK>
[   98.772515][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   98.772747][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   98.772921][  T166]  netif_close_many (net/core/dev.c:1804)
[   98.773168][  T166]  ? asym_cpu_capacity_scan (./include/linux/rculist.h:103)
[   98.773388][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.773598][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.773826][  T166]  ? __dev_close_many (net/core/dev.c:1781)
[   98.774062][  T166]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   98.774350][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   98.774638][  T166]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   98.774867][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.775161][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.775409][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.775641][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.775874][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.776114][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.776349][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.776578][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.776805][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.777043][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.777284][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.777492][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.777719][  T166]  __fput (fs/file_table.c:510)
[   98.777901][  T166]  task_work_run (kernel/task_work.c:233)
[   98.778138][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.778372][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.778602][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.778842][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.779024][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.779253][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.779482][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.779710][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.779947][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.780177][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.780463][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.780693][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.780921][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.781161][  T166]  get_signal (kernel/signal.c:3037)
[   98.781382][  T166]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.781603][  T166]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.781831][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[   98.782073][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.782310][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.782547][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.782785][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.783024][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.783314][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.783547][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.784967][  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)
[   98.785200][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.785413][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.785695][  T166] RIP: 0033:0x4c2d9e
[   98.785880][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.786237][  T166] RSP: 002b:00007ffec13b5510 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.786762][  T166] RAX: 0000000000000014 RBX: 0000000000000012 RCX: 00000000004c2d9e
[   98.787289][  T166] RDX: 0000000000000014 RSI: 00007ffec13b55f0 RDI: 0000000000000007
[   98.787628][  T166] RBP: 00007ffec13b5520 R08: 00007ffec13b55b0 R09: 000000000000000c
[   98.787977][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffec13b60b8
[   98.788325][  T166] R13: 00007ffec13b6140 R14: 00007ffec13b56e0 R15: 0000000000543540
| [   98.813768][  T166] ------------[ cut here ]------------
| [   98.814022][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/166
| [   98.814455][  T166] Modules linked in:
| [   98.815130][  T166] Tainted: [W]=WARN
[   98.815299][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.815555][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.815842][  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
[   98.816636][  T166] RSP: 0018:ffa0000000827820 EFLAGS: 00010286
[   98.816910][  T166] RAX: 00000000ffffffa6 RBX: ff1100000cbd4ac0 RCX: 1ff4000000104eca
[   98.817248][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000cbd4b70
[   98.817577][  T166] RBP: ff1100000b32c000 R08: 1fe220000197a96f R09: ff1100000c665158
[   98.817902][  T166] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   98.818243][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.818570][  T166] FS:  0000000000000000(0000) GS:ff110000abfd3000(0000) knlGS:0000000000000000
[   98.818960][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.819239][  T166] CR2: 00007f5d282736f0 CR3: 0000000021d39001 CR4: 0000000000771ef0
[   98.819532][  T166] PKRU: 55555554
[   98.819684][  T166] Call Trace:
[   98.819847][  T166]  <TASK>
[   98.819971][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.820276][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.820553][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.820772][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.821001][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.821225][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.821447][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.821668][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.821910][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.822146][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.822369][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.822591][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.822814][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.823042][  T166]  __fput (fs/file_table.c:510)
[   98.823466][  T166]  task_work_run (kernel/task_work.c:233)
[   98.823687][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.823905][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.824133][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.824365][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.824531][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.824952][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.825178][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.825401][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.825625][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.825843][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.826121][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.826344][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.826563][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.826782][  T166]  get_signal (kernel/signal.c:3037)
[   98.827016][  T166]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.827241][  T166]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.827462][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[   98.827686][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.827909][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.828139][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.828367][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.828585][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.828859][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.829085][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.829307][  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)
[   98.829526][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.829744][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.830021][  T166] RIP: 0033:0x4c2d9e
[   98.830198][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.830475][  T166] RSP: 002b:00007ffec13b5510 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.830807][  T166] RAX: 0000000000000014 RBX: 0000000000000012 RCX: 00000000004c2d9e
[   98.831139][  T166] RDX: 0000000000000014 RSI: 00007ffec13b55f0 RDI: 0000000000000007
[   98.831449][  T166] RBP: 00007ffec13b5520 R08: 00007ffec13b55b0 R09: 000000000000000c
[   98.831775][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffec13b60b8
[   98.832110][  T166] R13: 00007ffec13b6140 R14: 00007ffec13b56e0 R15: 0000000000543540
| [   98.855789][   T12] ------------[ cut here ]------------
| [   98.856076][   T12] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#1: 0/12
| [   98.856331][   T12] Modules linked in:
| [   98.856734][   T12] Tainted: [W]=WARN
[   98.856826][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.857021][   T12] Workqueue: netns cleanup_net
[   98.857161][   T12] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.857374][   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
[   98.857818][   T12] RSP: 0018:ffa00000000c7878 EFLAGS: 00010286
[   98.857977][   T12] RAX: 00000000ffffffa6 RBX: ff1100000cbd4dc0 RCX: 1ff4000000018ed5
[   98.858162][   T12] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000cbd4e70
[   98.858351][   T12] RBP: ff1100000a191000 R08: 1fe220000197a9cf R09: ff11000001afd1d0
[   98.858533][   T12] R10: 0000000000000001 R11: 0000000000000001 R12: 00000000ffffffff
[   98.858714][   T12] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.858895][   T12] FS:  0000000000000000(0000) GS:ff110000ac053000(0000) knlGS:0000000000000000
[   98.859113][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.859273][   T12] CR2: 000055a1c9d612b8 CR3: 000000000c45f004 CR4: 0000000000771ef0
[   98.859456][   T12] PKRU: 55555554
[   98.859548][   T12] Call Trace:
[   98.859643][   T12]  <TASK>
[   98.859708][   T12]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.859863][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.860023][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   98.860146][   T12]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   98.860272][   T12]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   98.860396][   T12]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   98.860519][   T12]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   98.860642][   T12]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   98.860762][   T12]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   98.860887][   T12]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   98.861017][   T12]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   98.861138][   T12]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.861268][   T12]  cleanup_net (net/core/net_namespace.c:702)
[   98.861420][   T12]  ? net_passive_dec (./include/linux/llist.h:241)
[   98.861551][   T12]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   98.861675][   T12]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   98.861796][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.861918][   T12]  process_one_work (kernel/workqueue.c:3314)
[   98.862050][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   98.862176][   T12]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.862302][   T12]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   98.862432][   T12]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.862555][   T12]  kthread (kernel/kthread.c:436)
[   98.862647][   T12]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.862798][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[   98.862919][   T12]  ret_from_fork (arch/x86/kernel/process.c:158)
[   98.863050][   T12]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   98.863207][   T12]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   98.863333][   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