======================================
| xx__-> [    9.185928][  T167] ------------[ cut here ]------------
| [    9.186143][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: unshare/167
| [    9.186421][  T167] Modules linked in:
| [    9.186915][  T167] Tainted: [W]=WARN
[    9.187018][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.187212][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.187392][  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
[    9.188038][  T167] RSP: 0018:ffa0000000817ab0 EFLAGS: 00010286
[    9.188242][  T167] RAX: 00000000ffffffa6 RBX: ff11000009b2c7c0 RCX: 1ff4000000102f1c
[    9.188537][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009b2c870
[    9.188763][  T167] RBP: ff11000009e59000 R08: 1fe220000136590f R09: ff1100000cae2e80
[    9.189067][  T167] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[    9.189288][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000009e59000
[    9.189499][  T167] FS:  00007fc80a01b740(0000) GS:ff1100008ed53000(0000) knlGS:0000000000000000
[    9.189744][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.189922][  T167] CR2: 0000560a68ff9310 CR3: 000000000d5b2001 CR4: 0000000000771ef0
[    9.190168][  T167] PKRU: 55555554
[    9.190280][  T167] Call Trace:
[    9.190383][  T167]  <TASK>
[    9.190453][  T167]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    9.190603][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.190747][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[    9.190884][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.190989][  T167]  register_netdevice (net/core/dev.c:11488)
[    9.191126][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    9.191296][  T167]  register_netdev (net/core/dev.c:11552)
[    9.191431][  T167]  loopback_net_init (drivers/net/loopback.c:218)
[    9.191576][  T167]  ops_init (net/core/net_namespace.c:137)
[    9.191687][  T167]  setup_net (net/core/net_namespace.c:446)
[    9.191790][  T167]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    9.191925][  T167]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    9.192063][  T167]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    9.192295][  T167]  copy_net_ns (net/core/net_namespace.c:579)
[    9.192431][  T167]  create_new_namespaces (kernel/nsproxy.c:132)
[    9.192578][  T167]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    9.192722][  T167]  ksys_unshare (kernel/fork.c:3243)
[    9.192944][  T167]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    9.193085][  T167]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    9.193219][  T167]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    9.193353][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.193583][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.193724][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.193857][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.194025][  T167] RIP: 0033:0x7fc80a116bcb
[    9.194259][  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
[    9.194848][  T167] RSP: 002b:00007fff04303cc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    9.195068][  T167] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc80a116bcb
[    9.195366][  T167] RDX: 0000000000000000 RSI: 00007fff04303a30 RDI: 0000000040000000
[    9.195832][  T167] RBP: 00007fff04304050 R08: 00007fff04303c20 R09: 0000000000000000
[    9.196098][  T167] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    9.196314][  T167] R13: 0000000000000000 R14: 00000000ffffffff R15: 0000560a68ffcb68
| [    9.229958][  T167] ------------[ cut here ]------------
| [    9.230120][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/167
| [    9.230380][  T167] Modules linked in:
| [    9.230855][  T167] Tainted: [W]=WARN
[    9.230950][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.231109][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.231274][  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
[    9.231754][  T167] RSP: 0018:ffa0000000817b58 EFLAGS: 00010286
[    9.231917][  T167] RAX: 00000000ffffffa6 RBX: ff1100000907e640 RCX: 1ff4000000102f31
[    9.232104][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000907e6f0
[    9.232291][  T167] RBP: ff1100000b060000 R08: 1fe220000120fcdf R09: ff1100000cae2e58
[    9.232487][  T167] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[    9.232745][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000b060000
[    9.233025][  T167] FS:  000000000cc80400(0000) GS:ff1100008ed53000(0000) knlGS:0000000000000000
[    9.233353][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.233574][  T167] CR2: 00007f280bdb1000 CR3: 000000000d5ad002 CR4: 0000000000771ef0
[    9.233764][  T167] PKRU: 55555554
[    9.233866][  T167] Call Trace:
[    9.233960][  T167]  <TASK>
[    9.234026][  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))
[    9.234155][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.234281][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[    9.234407][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.234507][  T167]  register_netdevice (net/core/dev.c:11488)
[    9.234641][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    9.234798][  T167]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    9.234925][  T167]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    9.235055][  T167]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    9.235180][  T167]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    9.235277][  T167]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    9.235400][  T167]  ? build_open_flags (fs/open.c:1212)
[    9.235533][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    9.235667][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    9.235795][  T167]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    9.235920][  T167]  ? fput_close_sync (fs/file_table.c:615)
[    9.236047][  T167]  ? __ia32_sys_open (fs/open.c:1374)
[    9.236171][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.236298][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.236426][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.236558][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.236691][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.236844][  T167] RIP: 0033:0x47cc8d
[    9.236946][  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 
[    9.237387][  T167] RSP: 002b:00007ffc36c6a820 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.237592][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.237779][  T167] RDX: 00007ffc36c6a8a0 RSI: 00000000400454ca RDI: 0000000000000005
[    9.237965][  T167] RBP: 00007ffc36c6a870 R08: 0000000000000000 R09: 0000000000000000
[    9.238151][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc36c6ad78
[    9.238338][  T167] R13: 00007ffc36c6ae00 R14: 0000000000000002 R15: 0000000000543540
| [    9.240045][  T167] ------------[ cut here ]------------
| [    9.240173][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/167
| [    9.240419][  T167] Modules linked in:
| [    9.240815][  T167] Tainted: [W]=WARN
[    9.240908][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.241065][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.241226][  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
[    9.241676][  T167] RSP: 0018:ffa0000000817c58 EFLAGS: 00010286
[    9.241833][  T167] RAX: 00000000ffffffa6 RBX: ff1100000907e4c0 RCX: 1ff4000000102f51
[    9.242023][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000907e570
[    9.242209][  T167] RBP: ff1100000b060000 R08: 1fe220000120fcaf R09: ff1100000cae2e58
[    9.242393][  T167] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
[    9.242587][  T167] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000003
[    9.242777][  T167] FS:  000000000cc80400(0000) GS:ff1100008ed53000(0000) knlGS:0000000000000000
[    9.242995][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.243150][  T167] CR2: 00007f280bdb1000 CR3: 000000000d5ad002 CR4: 0000000000771ef0
[    9.243336][  T167] PKRU: 55555554
[    9.243429][  T167] Call Trace:
[    9.243525][  T167]  <TASK>
[    9.243596][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    9.243722][  T167]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    9.243847][  T167]  notifier_call_chain (kernel/notifier.c:85)
[    9.243977][  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)
[    9.244103][  T167]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    9.244261][  T167]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    9.244387][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    9.244516][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    9.244652][  T167]  ? update_socket_protocol+0x10/0x10
[    9.244777][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[    9.244904][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.245034][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.245159][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.245284][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.245410][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.245578][  T167] RIP: 0033:0x47cc8d
[    9.245677][  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 
[    9.246123][  T167] RSP: 002b:00007ffc36c6a860 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.246308][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.246500][  T167] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    9.246690][  T167] RBP: 00007ffc36c6a8b0 R08: 0000000000000000 R09: 0000000000000000
[    9.246875][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc36c6ad78
[    9.247060][  T167] R13: 00007ffc36c6ae00 R14: 0000000000000002 R15: 0000000000543540
| [    9.248893][  T167] ------------[ cut here ]------------
| [    9.249027][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/167
| [    9.249287][  T167] Modules linked in:
| [    9.249794][  T167] Tainted: [W]=WARN
[    9.249895][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.250146][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.250319][  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
[    9.250887][  T167] RSP: 0018:ffa0000000817850 EFLAGS: 00010286
[    9.251053][  T167] RAX: 00000000ffffffa6 RBX: ff1100000907f840 RCX: 1ff4000000102ed0
[    9.251331][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000907f8f0
[    9.251535][  T167] RBP: ff1100000b060000 R08: 1fe220000120ff1f R09: ff1100000cae2e58
[    9.251737][  T167] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000001
[    9.252017][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff110000058c8900
[    9.252214][  T167] FS:  000000000cc80400(0000) GS:ff1100008ed53000(0000) knlGS:0000000000000000
[    9.252535][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.252707][  T167] CR2: 00007f280bdb1000 CR3: 000000000d5ad002 CR4: 0000000000771ef0
[    9.252903][  T167] PKRU: 55555554
[    9.253001][  T167] Call Trace:
[    9.253182][  T167]  <TASK>
[    9.253251][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.253384][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.253492][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    9.253631][  T167]  __dev_notify_flags (net/core/dev.c:9787)
[    9.253848][  T167]  ? netif_change_name (net/core/dev.c:1495)
[    9.253978][  T167]  ? __dev_change_flags (net/core/dev.c:9752)
[    9.254110][  T167]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    9.254241][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    9.254464][  T167]  netif_change_flags (net/core/dev.c:9820)
[    9.254604][  T167]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    9.254738][  T167]  dev_change_flags (net/core/dev_api.c:68)
[    9.254872][  T167]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    9.255090][  T167]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    9.255223][  T167]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    9.255358][  T167]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    9.255463][  T167]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    9.255683][  T167]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    9.255822][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    9.255957][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    9.256091][  T167]  sock_do_ioctl (net/socket.c:1313)
[    9.256306][  T167]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    9.256439][  T167]  ? ioctl_file_clone (fs/ioctl.c:244)
[    9.256584][  T167]  sock_ioctl (net/socket.c:1434)
[    9.256685][  T167]  ? br_ioctl_call (net/socket.c:1279)
[    9.256900][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    9.257038][  T167]  ? update_socket_protocol+0x10/0x10
[    9.257170][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[    9.257331][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.257552][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.257688][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.257820][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.257952][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.258203][  T167] RIP: 0033:0x47cc8d
[    9.258306][  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 
[    9.258948][  T167] RSP: 002b:00007ffc36c6a840 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.259242][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.259509][  T167] RDX: 00007ffc36c6a8b0 RSI: 0000000000008914 RDI: 0000000000000006
[    9.259800][  T167] RBP: 00007ffc36c6a890 R08: 0000000000000000 R09: 0000000000000000
[    9.259998][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc36c6ad78
[    9.260280][  T167] R13: 00007ffc36c6ae00 R14: 0000000000000002 R15: 0000000000543540
| [   99.033450][  T167] ------------[ cut here ]------------
| [   99.033669][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/167
| [   99.033980][  T167] Modules linked in:
| [   99.034389][  T167] Tainted: [W]=WARN
[   99.034495][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   99.034659][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   99.034839][  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
[   99.035305][  T167] RSP: 0018:ffa0000000817720 EFLAGS: 00010286
[   99.035530][  T167] RAX: 00000000ffffffa6 RBX: ff110000028ebcc0 RCX: 1ff4000000102eaa
[   99.035724][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000028ebd70
[   99.035950][  T167] RBP: ff1100000b060000 R08: 1fe220000051d7af R09: ff1100000cae2e58
[   99.036158][  T167] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000041
[   99.036365][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ffa00000008177c0
[   99.036627][  T167] FS:  0000000000000000(0000) GS:ff1100008ed53000(0000) knlGS:0000000000000000
[   99.036872][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   99.037046][  T167] CR2: 00007fb2d4fe86f0 CR3: 0000000037b39006 CR4: 0000000000771ef0
[   99.037302][  T167] PKRU: 55555554
[   99.037465][  T167] Call Trace:
[   99.037568][  T167]  <TASK>
[   99.037641][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   99.037778][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   99.037887][  T167]  netif_close_many (net/core/dev.c:1804)
[   99.038024][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.038161][  T167]  ? __dev_close_many (net/core/dev.c:1781)
[   99.038295][  T167]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   99.038556][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   99.038727][  T167]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   99.038867][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   99.039032][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.039165][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.039300][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.039436][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   99.039627][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   99.039762][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   99.039901][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.040039][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   99.040175][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   99.040315][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   99.040448][  T167]  __fput (fs/file_table.c:510)
[   99.040644][  T167]  task_work_run (kernel/task_work.c:233)
[   99.040778][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.040918][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[   99.041053][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   99.041190][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   99.041291][  T167]  ? exit_notify (kernel/exit.c:748)
[   99.041424][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.041648][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.041784][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   99.041926][  T167]  do_group_exit (kernel/exit.c:1119)
[   99.042062][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   99.042228][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.042363][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   99.042552][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   99.042687][  T167]  get_signal (kernel/signal.c:3037)
[   99.042829][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.042966][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[   99.043103][  T167]  ? finish_task_switch.isra.0 (kernel/sched/sched.h:1644 kernel/sched/core.c:5125 kernel/sched/core.c:5243)
[   99.043271][  T167]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   99.043407][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.043634][  T167]  ? trace_sched_exit_tp (./include/trace/events/sched.h:886 (discriminator 22))
[   99.043775][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   99.043917][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   99.044055][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.044188][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   99.044356][  T167]  irqentry_exit (kernel/entry/common.c:64 kernel/entry/common.c:98 ./include/linux/irq-entry-common.h:207 ./include/linux/irq-entry-common.h:244 ./include/linux/irq-entry-common.h:315 kernel/entry/common.c:162)
[   99.044581][  T167]  ? __irq_exit_rcu (kernel/softirq.c:729 (discriminator 3))
[   99.044717][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[   99.044857][  T167]  asm_sysvec_call_function_single (./arch/x86/include/asm/idtentry.h:704)
[   99.045025][  T167] RIP: 0033:0x4c2d9e
[   99.045133][  T167] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   99.045319][  T167] RSP: 002b:00007ffc36c6a1d0 EFLAGS: 00000202
[   99.045549][  T167] RAX: 0000000000000014 RBX: 00007ffc36c6a260 RCX: 00000000004c2d9e
[   99.045752][  T167] RDX: 0000000000000000 RSI: 00007ffc36c6a270 RDI: 0000000000000007
[   99.045965][  T167] RBP: 00007ffc36c6a1e0 R08: 0000000000000000 R09: 0000000000000000
[   99.046165][  T167] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc36c6a254
[   99.046366][  T167] R13: 00007ffc36c6ae00 R14: 00007ffc36c6a3a0 R15: 0000000000543540
| [   99.055146][  T167] ------------[ cut here ]------------
| [   99.055309][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: packetdrill/167
| [   99.055605][  T167] Modules linked in:
| [   99.056019][  T167] Tainted: [W]=WARN
[   99.056118][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   99.056282][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   99.056501][  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
[   99.056978][  T167] RSP: 0018:ffa0000000817850 EFLAGS: 00010286
[   99.057150][  T167] RAX: 00000000ffffffa6 RBX: ff1100000c445e40 RCX: 1ff4000000102ed0
[   99.057354][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000c445ef0
[   99.057568][  T167] RBP: ff1100000b060000 R08: 1fe2200001888bdf R09: ff1100000cae2e58
[   99.057766][  T167] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[   99.057964][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   99.058164][  T167] FS:  0000000000000000(0000) GS:ff1100008ed53000(0000) knlGS:0000000000000000
[   99.058394][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   99.058566][  T167] CR2: 00007f29a6065f98 CR3: 0000000037b39006 CR4: 0000000000771ef0
[   99.058766][  T167] PKRU: 55555554
[   99.058872][  T167] Call Trace:
[   99.058971][  T167]  <TASK>
[   99.059042][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   99.059211][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   99.059373][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.059508][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.059641][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.059778][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   99.059922][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   99.060056][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   99.060188][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.060320][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   99.060463][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   99.060601][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   99.060736][  T167]  __fput (fs/file_table.c:510)
[   99.060845][  T167]  task_work_run (kernel/task_work.c:233)
[   99.060977][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.061108][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[   99.061238][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   99.061373][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   99.061476][  T167]  ? exit_notify (kernel/exit.c:748)
[   99.061606][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.061738][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.061875][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   99.062011][  T167]  do_group_exit (kernel/exit.c:1119)
[   99.062142][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   99.062305][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.062464][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   99.062665][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   99.062854][  T167]  get_signal (kernel/signal.c:3037)
[   99.062993][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.063128][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[   99.063259][  T167]  ? finish_task_switch.isra.0 (kernel/sched/sched.h:1644 kernel/sched/core.c:5125 kernel/sched/core.c:5243)
[   99.063421][  T167]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   99.063562][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.063696][  T167]  ? trace_sched_exit_tp (./include/trace/events/sched.h:886 (discriminator 22))
[   99.063836][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   99.063969][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   99.064106][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.064241][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   99.064408][  T167]  irqentry_exit (kernel/entry/common.c:64 kernel/entry/common.c:98 ./include/linux/irq-entry-common.h:207 ./include/linux/irq-entry-common.h:244 ./include/linux/irq-entry-common.h:315 kernel/entry/common.c:162)
[   99.064547][  T167]  ? __irq_exit_rcu (kernel/softirq.c:729 (discriminator 3))
[   99.064679][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[   99.064818][  T167]  asm_sysvec_call_function_single (./arch/x86/include/asm/idtentry.h:704)
[   99.064981][  T167] RIP: 0033:0x4c2d9e
[   99.065089][  T167] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   99.065258][  T167] RSP: 002b:00007ffc36c6a1d0 EFLAGS: 00000202
[   99.065424][  T167] RAX: 0000000000000014 RBX: 00007ffc36c6a260 RCX: 00000000004c2d9e
[   99.065626][  T167] RDX: 0000000000000000 RSI: 00007ffc36c6a270 RDI: 0000000000000007
[   99.065829][  T167] RBP: 00007ffc36c6a1e0 R08: 0000000000000000 R09: 0000000000000000
[   99.066026][  T167] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc36c6a254
[   99.066221][  T167] R13: 00007ffc36c6ae00 R14: 00007ffc36c6a3a0 R15: 0000000000543540
| [   99.086415][   T12] ------------[ cut here ]------------
| [   99.086672][   T12] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: 0/12
| [   99.087109][   T12] Modules linked in:
| [   99.087633][   T12] Tainted: [W]=WARN
[   99.087731][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   99.087912][   T12] Workqueue: netns cleanup_net
[   99.088053][   T12] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   99.088216][   T12] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   99.088672][   T12] RSP: 0018:ffa00000000c7878 EFLAGS: 00010286
[   99.088833][   T12] RAX: 00000000ffffffa6 RBX: ff11000009554f40 RCX: 1ff4000000018ed5
[   99.089020][   T12] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009554ff0
[   99.089205][   T12] RBP: ff11000009e59000 R08: 1fe22000012aa9ff R09: ff11000001afd1d0
[   99.089410][   T12] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   99.089692][   T12] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   99.089978][   T12] FS:  0000000000000000(0000) GS:ff1100008ebd3000(0000) knlGS:0000000000000000
[   99.090277][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   99.090440][   T12] CR2: 00007f29a6065f98 CR3: 0000000009b85006 CR4: 0000000000771ef0
[   99.090641][   T12] PKRU: 55555554
[   99.090734][   T12] Call Trace:
[   99.090830][   T12]  <TASK>
[   99.090897][   T12]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   99.091057][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   99.091212][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   99.091340][   T12]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   99.091472][   T12]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   99.091595][   T12]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   99.091721][   T12]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   99.091849][   T12]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   99.091977][   T12]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   99.092102][   T12]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   99.092232][   T12]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   99.092355][   T12]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.092491][   T12]  cleanup_net (net/core/net_namespace.c:702)
[   99.092616][   T12]  ? net_passive_dec (./include/linux/llist.h:241)
[   99.092739][   T12]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   99.092875][   T12]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   99.092997][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.093127][   T12]  process_one_work (kernel/workqueue.c:3314)
[   99.093254][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   99.093377][   T12]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   99.093509][   T12]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   99.093638][   T12]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   99.093765][   T12]  kthread (kernel/kthread.c:436)
[   99.093863][   T12]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   99.094030][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[   99.094155][   T12]  ret_from_fork (arch/x86/kernel/process.c:158)
[   99.094281][   T12]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   99.094437][   T12]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   99.094564][   T12]  ? kthread_affine_node (kernel/kthread.c:378)


Finger prints:
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:register_netdevice:register_netdev:loopback_net_init
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:register_netdevice:__tun_chr_ioctl:__x64_sys_ioctl
rtmsg_ifinfo_build_skb:unregister_netdevice_many_notify:unregister_netdevice_queue:__tun_detach:tun_chr_close
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:netif_close_many:unregister_netdevice_many_notify:unregister_netdevice_queue
rtmsg_ifinfo_build_skb:rtnetlink_event:notifier_call_chain:netdev_update_features:__tun_chr_ioctl
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:__dev_notify_flags:netif_change_flags:dev_change_flags
rtmsg_ifinfo_build_skb:unregister_netdevice_many_notify:default_device_exit_batch:ops_undo_list:cleanup_net