======================================
| xx__-> [    9.366586][  T167] ------------[ cut here ]------------
| [    9.366789][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: unshare/167
| [    9.367065][  T167] Modules linked in:
| [    9.367522][  T167] Tainted: [W]=WARN
[    9.367622][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.367809][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.367984][  T167] 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
[    9.368463][  T167] RSP: 0018:ffa0000000847ab0 EFLAGS: 00010286
[    9.368631][  T167] RAX: 00000000ffffffa6 RBX: ff11000011487840 RCX: 1ff4000000108f1c
[    9.368832][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000114878f0
[    9.369096][  T167] RBP: ff11000010959000 R08: 1fe2200002290f1f R09: ff11000013192e80
[    9.369330][  T167] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[    9.369534][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000010959000
[    9.369734][  T167] FS:  00007f14f413f740(0000) GS:ff11000094f53000(0000) knlGS:0000000000000000
[    9.369966][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.370138][  T167] CR2: 00005612eedd6310 CR3: 0000000012647006 CR4: 0000000000771ef0
[    9.370344][  T167] PKRU: 55555554
[    9.370453][  T167] Call Trace:
[    9.370551][  T167]  <TASK>
[    9.370631][  T167]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    9.370766][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.370898][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[    9.371038][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.371138][  T167]  register_netdevice (net/core/dev.c:11488)
[    9.371270][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    9.371440][  T167]  register_netdev (net/core/dev.c:11552)
[    9.371574][  T167]  loopback_net_init (drivers/net/loopback.c:218)
[    9.371707][  T167]  ops_init (net/core/net_namespace.c:137)
[    9.371808][  T167]  setup_net (net/core/net_namespace.c:446)
[    9.371906][  T167]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    9.372043][  T167]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    9.372174][  T167]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    9.372306][  T167]  copy_net_ns (net/core/net_namespace.c:579)
[    9.372445][  T167]  create_new_namespaces (kernel/nsproxy.c:132)
[    9.372579][  T167]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    9.372709][  T167]  ksys_unshare (kernel/fork.c:3243)
[    9.372848][  T167]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    9.372983][  T167]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    9.373120][  T167]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    9.373252][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.373382][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.373520][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.373653][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.373815][  T167] RIP: 0033:0x7f14f423abcb
[    9.373953][  T167] 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
[    9.374443][  T167] RSP: 002b:00007ffea7004188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    9.374640][  T167] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f14f423abcb
[    9.374835][  T167] RDX: 0000000000000000 RSI: 00007ffea7003ef0 RDI: 0000000040000000
[    9.375038][  T167] RBP: 00007ffea7004510 R08: 00007ffea70040e0 R09: 0000000000000000
[    9.375234][  T167] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    9.375440][  T167] R13: 0000000000000000 R14: 00000000ffffffff R15: 00005612eedd9b68
| [    9.411230][  T167] ------------[ cut here ]------------
| [    9.411387][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#1: packetdrill/167
| [    9.411644][  T167] Modules linked in:
| [    9.412025][  T167] Tainted: [W]=WARN
[    9.412119][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.412271][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.412427][  T167] 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
[    9.413417][  T167] RSP: 0018:ffa0000000847b58 EFLAGS: 00010286
[    9.413666][  T167] RAX: 00000000ffffffa6 RBX: ff1100001311eac0 RCX: 1ff4000000108f31
[    9.413936][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100001311eb70
[    9.414206][  T167] RBP: ff1100000fe70000 R08: 1fe2200002623d6f R09: ff11000013192e58
[    9.414394][  T167] R10: 0000000000000001 R11: 0000000000000001 R12: 00000000ffffffff
[    9.414572][    C0] clocksource: Watchdog remote CPU 1 read timed out
[    9.414740][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000fe70000
[    9.414746][  T167] FS:  0000000028118400(0000) GS:ff11000094e53000(0000) knlGS:0000000000000000
[    9.415239][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.415392][  T167] CR2: 00007ff320d11000 CR3: 00000000132fc006 CR4: 0000000000771ef0
[    9.415578][  T167] PKRU: 55555554
[    9.415674][  T167] Call Trace:
[    9.415765][  T167]  <TASK>
[    9.415828][  T167]  ? 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))
[    9.415950][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.416078][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[    9.416200][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.416291][  T167]  register_netdevice (net/core/dev.c:11488)
[    9.416412][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    9.416565][  T167]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    9.416688][  T167]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    9.416811][  T167]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    9.416933][  T167]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    9.417037][  T167]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    9.417166][  T167]  ? build_open_flags (fs/open.c:1212)
[    9.417289][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    9.417410][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    9.417536][  T167]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    9.417656][  T167]  ? fput_close_sync (fs/file_table.c:615)
[    9.417777][  T167]  ? __ia32_sys_open (fs/open.c:1374)
[    9.417897][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.418025][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.418148][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.418269][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.418400][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.418555][  T167] RIP: 0033:0x47cc8d
[    9.418652][  T167] 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 
[    9.419087][  T167] RSP: 002b:00007ffc52d0fc40 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.419275][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.419465][  T167] RDX: 00007ffc52d0fcc0 RSI: 00000000400454ca RDI: 0000000000000005
[    9.419646][  T167] RBP: 00007ffc52d0fc90 R08: 0000000000000000 R09: 0000000000000000
[    9.419826][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc52d10198
[    9.420018][  T167] R13: 00007ffc52d10220 R14: 0000000000000002 R15: 0000000000543540
| [    9.421690][  T167] ------------[ cut here ]------------
| [    9.421809][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#1: packetdrill/167
| [    9.422050][  T167] Modules linked in:
| [    9.422421][  T167] Tainted: [W]=WARN
[    9.422524][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.422682][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.422838][  T167] 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
[    9.423272][  T167] RSP: 0018:ffa0000000847c58 EFLAGS: 00010286
[    9.423423][  T167] RAX: 00000000ffffffa6 RBX: ff1100001311fe40 RCX: 1ff4000000108f51
[    9.423613][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100001311fef0
[    9.423795][  T167] RBP: ff1100000fe70000 R08: 1fe2200002623fdf R09: ff11000013192e58
[    9.423974][  T167] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
[    9.424158][  T167] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000001
[    9.424344][  T167] FS:  0000000028118400(0000) GS:ff11000094e53000(0000) knlGS:0000000000000000
[    9.424558][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.424708][  T167] CR2: 00007ff320d11000 CR3: 00000000132fc006 CR4: 0000000000771ef0
[    9.424887][  T167] PKRU: 55555554
[    9.424977][  T167] Call Trace:
[    9.425071][  T167]  <TASK>
[    9.425137][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    9.425258][  T167]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    9.425382][  T167]  notifier_call_chain (kernel/notifier.c:85)
[    9.425509][  T167]  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)
[    9.425629][  T167]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    9.425784][  T167]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    9.425904][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    9.426028][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    9.426155][  T167]  ? update_socket_protocol+0x10/0x10
[    9.426277][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[    9.426399][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.426524][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.426644][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.426767][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.426886][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.427044][  T167] RIP: 0033:0x47cc8d
[    9.427138][  T167] 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 
[    9.427565][  T167] RSP: 002b:00007ffc52d0fc80 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.427749][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.427938][  T167] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    9.428119][  T167] RBP: 00007ffc52d0fcd0 R08: 0000000000000000 R09: 0000000000000000
[    9.428296][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc52d10198
[    9.428481][  T167] R13: 00007ffc52d10220 R14: 0000000000000002 R15: 0000000000543540
| [    9.430207][  T167] ------------[ cut here ]------------
| [    9.430387][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#1: packetdrill/167
| [    9.430658][  T167] Modules linked in:
| [    9.431050][  T167] Tainted: [W]=WARN
[    9.431148][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.431311][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.431484][  T167] 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
[    9.431941][  T167] RSP: 0018:ffa0000000847850 EFLAGS: 00010286
[    9.432109][  T167] RAX: 00000000ffffffa6 RBX: ff1100001311fb40 RCX: 1ff4000000108ed0
[    9.432307][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100001311fbf0
[    9.432508][  T167] RBP: ff1100000fe70000 R08: 1fe2200002623f7f R09: ff11000013192e58
[    9.432700][  T167] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
[    9.432896][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000005850900
[    9.433100][  T167] FS:  0000000028118400(0000) GS:ff11000094e53000(0000) knlGS:0000000000000000
[    9.433330][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.433503][  T167] CR2: 00007ff320d11000 CR3: 00000000132fc006 CR4: 0000000000771ef0
[    9.433694][  T167] PKRU: 55555554
[    9.433791][  T167] Call Trace:
[    9.433887][  T167]  <TASK>
[    9.433954][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.434091][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.434194][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    9.434324][  T167]  __dev_notify_flags (net/core/dev.c:9787)
[    9.434458][  T167]  ? netif_change_name (net/core/dev.c:1495)
[    9.434587][  T167]  ? __dev_change_flags (net/core/dev.c:9752)
[    9.434716][  T167]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    9.434845][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    9.434975][  T167]  netif_change_flags (net/core/dev.c:9820)
[    9.435112][  T167]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    9.435243][  T167]  dev_change_flags (net/core/dev_api.c:68)
[    9.435373][  T167]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    9.435509][  T167]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    9.435640][  T167]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    9.435771][  T167]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    9.435869][  T167]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    9.435997][  T167]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    9.436140][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    9.436270][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    9.436399][  T167]  sock_do_ioctl (net/socket.c:1313)
[    9.436534][  T167]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    9.436665][  T167]  ? ioctl_file_clone (fs/ioctl.c:244)
[    9.436796][  T167]  sock_ioctl (net/socket.c:1434)
[    9.436894][  T167]  ? br_ioctl_call (net/socket.c:1279)
[    9.437028][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    9.437162][  T167]  ? update_socket_protocol+0x10/0x10
[    9.437289][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[    9.437420][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.437555][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.437685][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.437814][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.437945][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.438117][  T167] RIP: 0033:0x47cc8d
[    9.438219][  T167] 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 
[    9.438681][  T167] RSP: 002b:00007ffc52d0fc60 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.438875][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.439077][  T167] RDX: 00007ffc52d0fcd0 RSI: 0000000000008914 RDI: 0000000000000006
[    9.439268][  T167] RBP: 00007ffc52d0fcb0 R08: 0000000000000000 R09: 0000000000000000
[    9.439466][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc52d10198
[    9.439756][  T167] R13: 00007ffc52d10220 R14: 0000000000000002 R15: 0000000000543540
| [   99.207209][  T167] ------------[ cut here ]------------
| [   99.207842][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/167
| [   99.208332][  T167] Modules linked in:
| [   99.209460][  T167] Tainted: [W]=WARN
[   99.209802][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   99.210295][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   99.210735][  T167] 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
[   99.211667][  T167] RSP: 0018:ffa00000008476f0 EFLAGS: 00010286
[   99.212150][  T167] RAX: 00000000ffffffa6 RBX: ff11000012605840 RCX: 1ff4000000108ea4
[   99.212637][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000126058f0
[   99.213171][  T167] RBP: ff1100000fe70000 R08: 1fe22000024c0b1f R09: ff11000013192e58
[   99.213721][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000041
[   99.214187][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ffa0000000847790
[   99.214745][  T167] FS:  0000000000000000(0000) GS:ff11000094ed3000(0000) knlGS:0000000000000000
[   99.215342][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   99.215779][  T167] CR2: 00007f6e51753000 CR3: 000000000b539006 CR4: 0000000000771ef0
[   99.216323][  T167] PKRU: 55555554
[   99.216708][  T167] Call Trace:
[   99.217016][  T167]  <TASK>
[   99.217356][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   99.217808][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   99.218029][  T167]  netif_close_many (net/core/dev.c:1804)
[   99.218304][  T167]  ? asym_cpu_capacity_scan (./include/linux/rculist.h:103)
[   99.218586][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   99.218850][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.219115][  T167]  ? __dev_close_many (net/core/dev.c:1781)
[   99.219394][  T167]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   99.219735][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   99.220090][  T167]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   99.220366][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   99.220697][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.220965][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.221230][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.221520][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   99.221789][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   99.222055][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   99.222330][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   99.222611][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.222881][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   99.223154][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   99.223519][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   99.223791][  T167]  __fput (fs/file_table.c:510)
[   99.224012][  T167]  task_work_run (kernel/task_work.c:233)
[   99.224278][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.224571][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[   99.224875][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   99.225155][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   99.225415][  T167]  ? exit_notify (kernel/exit.c:748)
[   99.225701][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.225982][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.226247][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   99.226540][  T167]  do_group_exit (kernel/exit.c:1119)
[   99.226801][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   99.227117][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.227389][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   99.227671][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   99.227936][  T167]  get_signal (kernel/signal.c:3037)
[   99.228206][  T167]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   99.228499][  T167]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   99.228766][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[   99.229034][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   99.229309][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   99.229594][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.229859][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   99.230176][  T167]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   99.230461][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.230725][  T167]  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)
[   99.230990][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[   99.231253][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   99.231590][  T167] RIP: 0033:0x4c2d9e
[   99.231810][  T167] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   99.232160][  T167] RSP: 002b:00007ffc52d0f5f0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   99.232553][  T167] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[   99.232923][  T167] RDX: 0000000000000014 RSI: 00007ffc52d0f6d0 RDI: 0000000000000007
[   99.233301][  T167] RBP: 00007ffc52d0f600 R08: 00007ffc52d0f690 R09: 000000000000000c
[   99.233680][  T167] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000028123340
[   99.234051][  T167] R13: 00007ffc52d10220 R14: 00007ffc52d0f7c0 R15: 0000000000543540
| [   99.245776][  T167] ------------[ cut here ]------------
| [   99.246055][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/167
| [   99.246563][  T167] Modules linked in:
| [   99.247311][  T167] Tainted: [W]=WARN
[   99.247523][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   99.247824][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   99.248122][  T167] 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
[   99.248908][  T167] RSP: 0018:ffa0000000847820 EFLAGS: 00010286
[   99.249202][  T167] RAX: 00000000ffffffa6 RBX: ff11000010b396c0 RCX: 1ff4000000108eca
[   99.249559][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000010b39770
[   99.249891][  T167] RBP: ff1100000fe70000 R08: 1fe22000021672ef R09: ff11000013192e58
[   99.250225][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[   99.250578][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   99.250917][  T167] FS:  0000000000000000(0000) GS:ff11000094ed3000(0000) knlGS:0000000000000000
[   99.251326][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   99.251644][  T167] CR2: 00007f6e51753000 CR3: 000000000b539006 CR4: 0000000000771ef0
[   99.251988][  T167] PKRU: 55555554
[   99.252189][  T167] Call Trace:
[   99.252402][  T167]  <TASK>
[   99.252578][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   99.252871][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   99.253157][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.253416][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.253690][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.253948][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   99.254206][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   99.254492][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   99.254751][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   99.255005][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.255257][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   99.255542][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   99.255802][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   99.256056][  T167]  __fput (fs/file_table.c:510)
[   99.256269][  T167]  task_work_run (kernel/task_work.c:233)
[   99.256550][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.256805][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[   99.257061][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   99.257329][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   99.257555][  T167]  ? exit_notify (kernel/exit.c:748)
[   99.257809][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.258067][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.258329][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   99.258603][  T167]  do_group_exit (kernel/exit.c:1119)
[   99.258858][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   99.259164][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.259427][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   99.259762][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   99.260016][  T167]  get_signal (kernel/signal.c:3037)
[   99.260274][  T167]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   99.260550][  T167]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   99.260805][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[   99.261062][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   99.261326][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   99.261605][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.261863][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   99.262174][  T167]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   99.262454][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.262714][  T167]  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)
[   99.262970][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[   99.263223][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   99.263554][  T167] RIP: 0033:0x4c2d9e
[   99.263769][  T167] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   99.264083][  T167] RSP: 002b:00007ffc52d0f5f0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   99.264463][  T167] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[   99.264819][  T167] RDX: 0000000000000014 RSI: 00007ffc52d0f6d0 RDI: 0000000000000007
[   99.265174][  T167] RBP: 00007ffc52d0f600 R08: 00007ffc52d0f690 R09: 000000000000000c
[   99.265549][  T167] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000028123340
[   99.265902][  T167] R13: 00007ffc52d10220 R14: 00007ffc52d0f7c0 R15: 0000000000543540
| [   99.292410][   T67] ------------[ cut here ]------------
| [   99.292644][   T67] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: 1/67
| [   99.292934][   T67] Modules linked in:
| [   99.293355][   T67] Tainted: [W]=WARN
[   99.293454][   T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   99.293612][   T67] Workqueue: netns cleanup_net
[   99.293753][   T67] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   99.293916][   T67] 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
[   99.294367][   T67] RSP: 0018:ffa0000000487878 EFLAGS: 00010286
[   99.294533][   T67] RAX: 00000000ffffffa6 RBX: ff11000010b38dc0 RCX: 1ff4000000090ed5
[   99.294720][   T67] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000010b38e70
[   99.294907][   T67] RBP: ff11000010959000 R08: 1fe22000021671cf R09: ff1100000f848bd0
[   99.295093][   T67] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[   99.295277][   T67] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   99.295487][   T67] FS:  0000000000000000(0000) GS:ff11000094f53000(0000) knlGS:0000000000000000
[   99.295706][   T67] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   99.295868][   T67] CR2: 000055fa720ec2b8 CR3: 0000000012740005 CR4: 0000000000771ef0
[   99.296059][   T67] PKRU: 55555554
[   99.296153][   T67] Call Trace:
[   99.296247][   T67]  <TASK>
[   99.296320][   T67]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   99.296484][   T67]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   99.296647][   T67]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   99.296775][   T67]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   99.296899][   T67]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   99.297026][   T67]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   99.297158][   T67]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   99.297288][   T67]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   99.297413][   T67]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   99.297549][   T67]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   99.297675][   T67]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   99.297799][   T67]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.297926][   T67]  cleanup_net (net/core/net_namespace.c:702)
[   99.298053][   T67]  ? net_passive_dec (./include/linux/llist.h:241)
[   99.298177][   T67]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   99.298309][   T67]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   99.298433][   T67]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.298605][   T67]  process_one_work (kernel/workqueue.c:3314)
[   99.298733][   T67]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   99.298856][   T67]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   99.298986][   T67]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   99.299115][   T67]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   99.299241][   T67]  ? __kthread_parkme (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 kernel/kthread.c:272)
[   99.299372][   T67]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   99.299502][   T67]  kthread (kernel/kthread.c:436)
[   99.299597][   T67]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   99.299753][   T67]  ? kthread_affine_node (kernel/kthread.c:378)
[   99.299879][   T67]  ret_from_fork (arch/x86/kernel/process.c:158)
[   99.300008][   T67]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   99.300165][   T67]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   99.300296][   T67]  ? 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