======================================
| xx__-> [    9.003674][  T166] ------------[ cut here ]------------
| [    9.003877][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: unshare/166
| [    9.004151][  T166] Modules linked in:
| [    9.004543][  T166] Tainted: [W]=WARN
[    9.005210][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.005378][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.005548][  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
[    9.006068][  T166] RSP: 0018:ffa00000005e7ab0 EFLAGS: 00010286
[    9.006237][  T166] RAX: 00000000ffffffa6 RBX: ff11000009af0040 RCX: 1ff40000000bcf1c
[    9.006442][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009af00f0
[    9.006647][  T166] RBP: ff11000008851000 R08: 1fe220000135e01f R09: ff1100000c370b80
[    9.006840][  T166] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[    9.007042][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000008851000
[    9.007239][  T166] FS:  00007f95035db740(0000) GS:ff11000089bd3000(0000) knlGS:0000000000000000
[    9.007466][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.007636][  T166] CR2: 000055c29a04f310 CR3: 000000000bdc1002 CR4: 0000000000771ef0
[    9.007836][  T166] PKRU: 55555554
[    9.007934][  T166] Call Trace:
[    9.008042][  T166]  <TASK>
[    9.008112][  T166]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    9.008246][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.008377][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    9.008509][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.008618][  T166]  register_netdevice (net/core/dev.c:11488)
[    9.008750][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    9.008913][  T166]  register_netdev (net/core/dev.c:11552)
[    9.009047][  T166]  loopback_net_init (drivers/net/loopback.c:218)
[    9.009180][  T166]  ops_init (net/core/net_namespace.c:137)
[    9.009285][  T166]  setup_net (net/core/net_namespace.c:446)
[    9.009433][  T166]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    9.009568][  T166]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    9.009705][  T166]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    9.009837][  T166]  copy_net_ns (net/core/net_namespace.c:579)
[    9.009969][  T166]  create_new_namespaces (kernel/nsproxy.c:132)
[    9.010106][  T166]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    9.010236][  T166]  ksys_unshare (kernel/fork.c:3243)
[    9.010368][  T166]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    9.010502][  T166]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    9.010635][  T166]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    9.010764][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.010892][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.011031][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.011166][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.011328][  T166] RIP: 0033:0x7f95036d6bcb
[    9.011466][  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
[    9.011929][  T166] RSP: 002b:00007ffc749f64f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    9.012131][  T166] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f95036d6bcb
[    9.012323][  T166] RDX: 0000000000000000 RSI: 00007ffc749f6260 RDI: 0000000040000000
[    9.012514][  T166] RBP: 00007ffc749f6880 R08: 00007ffc749f6450 R09: 0000000000000000
[    9.012710][  T166] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    9.012910][  T166] R13: 0000000000000000 R14: 00000000ffffffff R15: 000055c29a052b68
| [    9.031961][  T166] ------------[ cut here ]------------
| [    9.032114][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/166
| [    9.032354][  T166] Modules linked in:
| [    9.032754][  T166] Tainted: [W]=WARN
[    9.032846][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.033005][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.033165][  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
[    9.033600][  T166] RSP: 0018:ffa00000005e7b58 EFLAGS: 00010286
[    9.033754][  T166] RAX: 00000000ffffffa6 RBX: ff1100000c162040 RCX: 1ff40000000bcf31
[    9.033939][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000c1620f0
[    9.034134][  T166] RBP: ff1100000af8c000 R08: 1fe220000182c41f R09: ff1100000c370b58
[    9.034315][  T166] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[    9.034497][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000af8c000
[    9.034687][  T166] FS:  000000002a8bb400(0000) GS:ff11000089bd3000(0000) knlGS:0000000000000000
[    9.034902][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.035067][  T166] CR2: 00007f2f5e8b9000 CR3: 00000000094af003 CR4: 0000000000771ef0
[    9.035252][  T166] PKRU: 55555554
[    9.035342][  T166] Call Trace:
[    9.035433][  T166]  <TASK>
[    9.035497][  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))
[    9.035625][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.035746][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    9.035871][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.035986][  T166]  register_netdevice (net/core/dev.c:11488)
[    9.036170][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    9.036389][  T166]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    9.037011][  T166]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    9.037145][  T166]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    9.037271][  T166]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    9.037365][  T166]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    9.037492][  T166]  ? build_open_flags (fs/open.c:1212)
[    9.037625][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    9.037748][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    9.037871][  T166]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    9.038007][  T166]  ? fput_close_sync (fs/file_table.c:615)
[    9.038151][  T166]  ? __ia32_sys_open (fs/open.c:1374)
[    9.038330][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.038464][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.038598][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.038725][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.038847][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.039006][  T166] RIP: 0033:0x47cc8d
[    9.039104][  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 
[    9.039540][  T166] RSP: 002b:00007ffe0e64c940 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.039735][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.039920][  T166] RDX: 00007ffe0e64c9c0 RSI: 00000000400454ca RDI: 0000000000000005
[    9.040108][  T166] RBP: 00007ffe0e64c990 R08: 0000000000000000 R09: 0000000000000000
[    9.040291][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe0e64ce98
[    9.040475][  T166] R13: 00007ffe0e64cf20 R14: 0000000000000002 R15: 0000000000543540
| [    9.042152][  T166] ------------[ cut here ]------------
| [    9.042273][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/166
| [    9.042511][  T166] Modules linked in:
| [    9.042932][  T166] Tainted: [W]=WARN
[    9.043030][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.043181][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.043341][  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
[    9.043776][  T166] RSP: 0018:ffa00000005e7c58 EFLAGS: 00010286
[    9.043927][  T166] RAX: 00000000ffffffa6 RBX: ff1100000c1624c0 RCX: 1ff40000000bcf51
[    9.044116][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000c162570
[    9.044297][  T166] RBP: ff1100000af8c000 R08: 1fe220000182c4af R09: ff1100000c370b58
[    9.044479][  T166] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[    9.044662][  T166] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
[    9.044843][  T166] FS:  000000002a8bb400(0000) GS:ff11000089bd3000(0000) knlGS:0000000000000000
[    9.045062][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.045219][  T166] CR2: 00007f2f5e8b9000 CR3: 00000000094af003 CR4: 0000000000771ef0
[    9.045403][  T166] PKRU: 55555554
[    9.045494][  T166] Call Trace:
[    9.045589][  T166]  <TASK>
[    9.045652][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    9.045778][  T166]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    9.045953][  T166]  notifier_call_chain (kernel/notifier.c:85)
[    9.046097][  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)
[    9.046220][  T166]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    9.046377][  T166]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    9.046498][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    9.046626][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    9.046749][  T166]  ? update_socket_protocol+0x10/0x10
[    9.046870][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    9.047000][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.047123][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.047245][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.047372][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.047586][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.047740][  T166] RIP: 0033:0x47cc8d
[    9.047836][  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 
[    9.048343][  T166] RSP: 002b:00007ffe0e64c980 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.048525][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.048710][  T166] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    9.048891][  T166] RBP: 00007ffe0e64c9d0 R08: 0000000000000005 R09: 0000000000001ff0
[    9.049163][  T166] R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffe0e64ce98
[    9.049340][  T166] R13: 00007ffe0e64cf20 R14: 0000000000000002 R15: 0000000000543540
| [    9.051260][  T166] ------------[ cut here ]------------
| [    9.051397][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/166
| [    9.051735][  T166] Modules linked in:
| [    9.052218][  T166] Tainted: [W]=WARN
[    9.052314][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.052478][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.052648][  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
[    9.053227][  T166] RSP: 0018:ffa00000005e7850 EFLAGS: 00010286
[    9.053512][  T166] RAX: 00000000ffffffa6 RBX: ff1100000c163e40 RCX: 1ff40000000bced0
[    9.053710][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000c163ef0
[    9.053900][  T166] RBP: ff1100000af8c000 R08: 1fe220000182c7df R09: ff1100000c370b58
[    9.054182][  T166] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
[    9.054376][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff110000057f8900
[    9.054571][  T166] FS:  000000002a8bb400(0000) GS:ff11000089bd3000(0000) knlGS:0000000000000000
[    9.054878][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.055044][  T166] CR2: 00007f2f5e8b9000 CR3: 00000000094af003 CR4: 0000000000771ef0
[    9.055319][  T166] PKRU: 55555554
[    9.055413][  T166] Call Trace:
[    9.055508][  T166]  <TASK>
[    9.055580][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.055708][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.055806][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    9.056032][  T166]  __dev_notify_flags (net/core/dev.c:9787)
[    9.056161][  T166]  ? netif_change_name (net/core/dev.c:1495)
[    9.056290][  T166]  ? __dev_change_flags (net/core/dev.c:9752)
[    9.056418][  T166]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    9.056643][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    9.056835][  T166]  netif_change_flags (net/core/dev.c:9820)
[    9.057028][  T166]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    9.057224][  T166]  dev_change_flags (net/core/dev_api.c:68)
[    9.057544][  T166]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    9.057689][  T166]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    9.057821][  T166]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    9.057952][  T166]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    9.058137][  T166]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    9.058267][  T166]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    9.058400][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    9.058530][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    9.058665][  T166]  sock_do_ioctl (net/socket.c:1313)
[    9.058797][  T166]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    9.058927][  T166]  ? ioctl_file_clone (fs/ioctl.c:244)
[    9.059065][  T166]  sock_ioctl (net/socket.c:1434)
[    9.059248][  T166]  ? br_ioctl_call (net/socket.c:1279)
[    9.059383][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    9.059513][  T166]  ? update_socket_protocol+0x10/0x10
[    9.059647][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    9.059860][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.059998][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.060128][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.060254][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.060462][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.060625][  T166] RIP: 0033:0x47cc8d
[    9.060726][  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 
[    9.061269][  T166] RSP: 002b:00007ffe0e64c960 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.061462][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.061741][  T166] RDX: 00007ffe0e64c9d0 RSI: 0000000000008914 RDI: 0000000000000006
[    9.061931][  T166] RBP: 00007ffe0e64c9b0 R08: 0000000000000005 R09: 0000000000001ff0
[    9.062129][  T166] R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffe0e64ce98
[    9.062401][  T166] R13: 00007ffe0e64cf20 R14: 0000000000000002 R15: 0000000000543540
| [   98.838177][  T166] ------------[ cut here ]------------
| [   98.838373][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/166
| [   98.838655][  T166] Modules linked in:
| [   98.839070][  T166] Tainted: [W]=WARN
[   98.839171][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.839346][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.839521][  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
[   98.839995][  T166] RSP: 0018:ffa00000005e76f0 EFLAGS: 00010286
[   98.840167][  T166] RAX: 00000000ffffffa6 RBX: ff1100000c4b5240 RCX: 1ff40000000bcea4
[   98.840374][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000c4b52f0
[   98.840572][  T166] RBP: ff1100000af8c000 R08: 1fe2200001896a5f R09: ff1100000c370b58
[   98.840770][  T166] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000041
[   98.840966][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ffa00000005e7790
[   98.841167][  T166] FS:  0000000000000000(0000) GS:ff11000089bd3000(0000) knlGS:0000000000000000
[   98.841404][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.841575][  T166] CR2: 00007f363f2196f0 CR3: 0000000017539001 CR4: 0000000000771ef0
[   98.841775][  T166] PKRU: 55555554
[   98.841876][  T166] Call Trace:
[   98.841975][  T166]  <TASK>
[   98.842044][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   98.842180][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   98.842287][  T166]  netif_close_many (net/core/dev.c:1804)
[   98.842424][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.842563][  T166]  ? __dev_close_many (net/core/dev.c:1781)
[   98.842695][  T166]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   98.842860][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   98.843027][  T166]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   98.843162][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.843332][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.843463][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.843602][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.843735][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.843868][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.844002][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.844134][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.844273][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.844406][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.844541][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.844759][  T166]  __fput (fs/file_table.c:510)
[   98.844864][  T166]  task_work_run (kernel/task_work.c:233)
[   98.844994][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.845130][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.845269][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.845402][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.845503][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.845702][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.845836][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.845968][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.846103][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.846250][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.846459][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.846811][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.847015][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.847149][  T166]  get_signal (kernel/signal.c:3037)
[   98.847293][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.847427][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.847649][  T166]  ? __sys_recvmsg (net/socket.c:2993)
[   98.847782][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.847916][  T166]  ? __sys_recvmsg_sock (net/socket.c:2974)
[   98.848050][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.848185][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.848357][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.848491][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.848694][  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)
[   98.848827][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.848960][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.849184][  T166] RIP: 0033:0x4c2d9e
[   98.849307][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.849490][  T166] RSP: 002b:00007ffe0e64c2f0 EFLAGS: 00000202 ORIG_RAX: 000000000000002f
[   98.849740][  T166] RAX: 0000000000000050 RBX: 00007ffe0e64c380 RCX: 00000000004c2d9e
[   98.849943][  T166] RDX: 0000000000000000 RSI: 00007ffe0e64c390 RDI: 0000000000000007
[   98.850180][  T166] RBP: 00007ffe0e64c300 R08: 0000000000000000 R09: 0000000000000000
[   98.850448][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffe0e64c374
[   98.850655][  T166] R13: 00007ffe0e64cf20 R14: 00007ffe0e64c4c0 R15: 0000000000543540
| [   98.860625][  T166] ------------[ cut here ]------------
| [   98.861988][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: packetdrill/166
| [   98.862275][  T166] Modules linked in:
| [   98.862683][  T166] Tainted: [W]=WARN
[   98.862782][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.862947][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.863115][  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
[   98.863583][  T166] RSP: 0018:ffa00000005e7820 EFLAGS: 00010286
[   98.863748][  T166] RAX: 00000000ffffffa6 RBX: ff11000009250c40 RCX: 1ff40000000bceca
[   98.863939][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009250cf0
[   98.864128][  T166] RBP: ff1100000af8c000 R08: 1fe220000124a19f R09: ff1100000c370b58
[   98.864325][  T166] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   98.864516][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.864711][  T166] FS:  0000000000000000(0000) GS:ff11000089bd3000(0000) knlGS:0000000000000000
[   98.864933][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.865097][  T166] CR2: 00007f363f2196f0 CR3: 0000000017539001 CR4: 0000000000771ef0
[   98.865305][  T166] PKRU: 55555554
[   98.865400][  T166] Call Trace:
[   98.865495][  T166]  <TASK>
[   98.865567][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.865796][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.866026][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.866156][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.866290][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.866420][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.866548][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.866690][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.866819][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.866947][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.867076][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.867211][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.867339][  T166]  __fput (fs/file_table.c:510)
[   98.867441][  T166]  task_work_run (kernel/task_work.c:233)
[   98.867572][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.867698][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   98.867826][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.867954][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.868052][  T166]  ? exit_notify (kernel/exit.c:748)
[   98.868181][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.868341][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.868468][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.868601][  T166]  do_group_exit (kernel/exit.c:1119)
[   98.868728][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.868887][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.869015][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.869141][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.869271][  T166]  get_signal (kernel/signal.c:3037)
[   98.869401][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.869531][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.869666][  T166]  ? __sys_recvmsg (net/socket.c:2993)
[   98.869794][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.869920][  T166]  ? __sys_recvmsg_sock (net/socket.c:2974)
[   98.870048][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.870178][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.870340][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.870467][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.870600][  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)
[   98.870728][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.870857][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.871015][  T166] RIP: 0033:0x4c2d9e
[   98.871120][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.871285][  T166] RSP: 002b:00007ffe0e64c2f0 EFLAGS: 00000202 ORIG_RAX: 000000000000002f
[   98.871477][  T166] RAX: 0000000000000050 RBX: 00007ffe0e64c380 RCX: 00000000004c2d9e
[   98.871678][  T166] RDX: 0000000000000000 RSI: 00007ffe0e64c390 RDI: 0000000000000007
[   98.871869][  T166] RBP: 00007ffe0e64c300 R08: 0000000000000000 R09: 0000000000000000
[   98.872062][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffe0e64c374
[   98.872258][  T166] R13: 00007ffe0e64cf20 R14: 00007ffe0e64c4c0 R15: 0000000000543540
| [   98.895325][   T68] ------------[ cut here ]------------
| [   98.895499][   T68] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#1: 1/68
| [   98.895809][   T68] Modules linked in:
| [   98.896213][   T68] Tainted: [W]=WARN
[   98.896307][   T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.896465][   T68] Workqueue: netns cleanup_net
[   98.896604][   T68] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.896765][   T68] 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
[   98.897186][   T68] RSP: 0018:ffa0000000497878 EFLAGS: 00010286
[   98.897341][   T68] RAX: 00000000ffffffa6 RBX: ff110000092516c0 RCX: 1ff4000000092ed5
[   98.897517][   T68] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009251770
[   98.897699][   T68] RBP: ff11000008851000 R08: 1fe220000124a2ef R09: ff110000089daed0
[   98.897876][   T68] R10: 0000000000000001 R11: 0000000000000001 R12: 00000000ffffffff
[   98.898056][   T68] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.898239][   T68] FS:  0000000000000000(0000) GS:ff11000089c53000(0000) knlGS:0000000000000000
[   98.898447][   T68] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.898601][   T68] CR2: 00007efd5d0c0680 CR3: 0000000017539001 CR4: 0000000000771ef0
[   98.898784][   T68] PKRU: 55555554
[   98.898874][   T68] Call Trace:
[   98.898963][   T68]  <TASK>
[   98.899029][   T68]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.899181][   T68]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.899335][   T68]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   98.899456][   T68]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   98.899587][   T68]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   98.899706][   T68]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   98.899830][   T68]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   98.899949][   T68]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   98.900068][   T68]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   98.900190][   T68]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   98.900324][   T68]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   98.900441][   T68]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.900569][   T68]  cleanup_net (net/core/net_namespace.c:702)
[   98.900689][   T68]  ? net_passive_dec (./include/linux/llist.h:241)
[   98.900812][   T68]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   98.900933][   T68]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   98.901052][   T68]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.901174][   T68]  process_one_work (kernel/workqueue.c:3314)
[   98.901300][   T68]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   98.901416][   T68]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.901540][   T68]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   98.901668][   T68]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.901785][   T68]  ? __kthread_parkme (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 kernel/kthread.c:272)
[   98.901905][   T68]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.902024][   T68]  kthread (kernel/kthread.c:436)
[   98.902114][   T68]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.902266][   T68]  ? kthread_affine_node (kernel/kthread.c:378)
[   98.902386][   T68]  ret_from_fork (arch/x86/kernel/process.c:158)
[   98.902506][   T68]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   98.902697][   T68]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   98.902826][   T68]  ? 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