======================================
| xx__-> [    8.742184][  T167] ------------[ cut here ]------------
| [    8.742460][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: unshare/167
| [    8.742785][  T167] Modules linked in:
| [    8.744371][  T167] Tainted: [W]=WARN
[    8.744630][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.744981][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.745297][  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
[    8.745910][  T167] RSP: 0018:ffa0000000847ab0 EFLAGS: 00010286
[    8.746216][  T167] RAX: 00000000ffffffa6 RBX: ff1100000b1484c0 RCX: 1ff4000000108f1c
[    8.746550][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000b148570
[    8.746888][  T167] RBP: ff11000008841000 R08: 1fe22000016290af R09: ff1100000c442e80
[    8.747218][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[    8.747486][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000008841000
[    8.747740][  T167] FS:  00007f8c66c0e740(0000) GS:ff110000a70d3000(0000) knlGS:0000000000000000
[    8.748166][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.748391][  T167] CR2: 00005632b762b310 CR3: 000000000b3d2002 CR4: 0000000000771ef0
[    8.748641][  T167] PKRU: 55555554
[    8.748789][  T167] Call Trace:
[    8.748945][  T167]  <TASK>
[    8.749115][  T167]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    8.749301][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.749487][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.749673][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.749826][  T167]  register_netdevice (net/core/dev.c:11488)
[    8.750058][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.750278][  T167]  register_netdev (net/core/dev.c:11552)
[    8.750463][  T167]  loopback_net_init (drivers/net/loopback.c:218)
[    8.750650][  T167]  ops_init (net/core/net_namespace.c:137)
[    8.750803][  T167]  setup_net (net/core/net_namespace.c:446)
[    8.750975][  T167]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    8.751155][  T167]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    8.751343][  T167]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    8.751531][  T167]  copy_net_ns (net/core/net_namespace.c:579)
[    8.751717][  T167]  create_new_namespaces (kernel/nsproxy.c:132)
[    8.751910][  T167]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    8.752104][  T167]  ksys_unshare (kernel/fork.c:3243)
[    8.752291][  T167]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    8.752479][  T167]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    8.752667][  T167]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    8.752859][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.753054][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.753241][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.753426][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.753642][  T167] RIP: 0033:0x7f8c66d09bcb
[    8.753833][  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
[    8.754398][  T167] RSP: 002b:00007ffe48c9c978 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    8.754649][  T167] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8c66d09bcb
[    8.754907][  T167] RDX: 0000000000000000 RSI: 00007ffe48c9c6e0 RDI: 0000000040000000
[    8.755170][  T167] RBP: 00007ffe48c9cd00 R08: 00007ffe48c9c8d0 R09: 0000000000000000
[    8.755419][  T167] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    8.755666][  T167] R13: 0000000000000000 R14: 00000000ffffffff R15: 00005632b762eb68
| [    8.787361][  T167] ------------[ cut here ]------------
| [    8.787543][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/167
| [    8.787855][  T167] Modules linked in:
| [    8.788370][  T167] Tainted: [W]=WARN
[    8.788505][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.788700][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.788910][  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
[    8.789405][  T167] RSP: 0018:ffa0000000847b58 EFLAGS: 00010286
[    8.789601][  T167] RAX: 00000000ffffffa6 RBX: ff110000094c4340 RCX: 1ff4000000108f31
[    8.789823][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000094c43f0
[    8.790066][  T167] RBP: ff11000008a00000 R08: 1fe220000129887f R09: ff1100000c442e58
[    8.790288][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[    8.790510][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000008a00000
[    8.790735][  T167] FS:  0000000025f7f400(0000) GS:ff110000a70d3000(0000) knlGS:0000000000000000
[    8.791004][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.791201][  T167] CR2: 00007f35fc495000 CR3: 000000000c5a2003 CR4: 0000000000771ef0
[    8.791427][  T167] PKRU: 55555554
[    8.791562][  T167] Call Trace:
[    8.791697][  T167]  <TASK>
[    8.791805][  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))
[    8.791987][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.792155][  T167]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.792322][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.792461][  T167]  register_netdevice (net/core/dev.c:11488)
[    8.792631][  T167]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.792825][  T167]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    8.793013][  T167]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    8.793182][  T167]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    8.793347][  T167]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    8.793487][  T167]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    8.793656][  T167]  ? build_open_flags (fs/open.c:1212)
[    8.793823][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.794008][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    8.794176][  T167]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    8.794341][  T167]  ? fput_close_sync (fs/file_table.c:615)
[    8.794507][  T167]  ? __ia32_sys_open (fs/open.c:1374)
[    8.794673][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.794848][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.795025][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.795192][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.795357][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.795551][  T167] RIP: 0033:0x47cc8d
[    8.795692][  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 
[    8.796177][  T167] RSP: 002b:00007fffd58efc60 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.796402][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.796626][  T167] RDX: 00007fffd58efce0 RSI: 00000000400454ca RDI: 0000000000000005
[    8.796877][  T167] RBP: 00007fffd58efcb0 R08: 0000000000000000 R09: 0000000000000000
[    8.797117][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffd58f01b8
[    8.797341][  T167] R13: 00007fffd58f0240 R14: 0000000000000002 R15: 0000000000543540
| [    8.799353][  T167] ------------[ cut here ]------------
| [    8.799514][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/167
| [    8.799790][  T167] Modules linked in:
| [    8.800311][  T167] Tainted: [W]=WARN
[    8.800449][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.800642][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.800850][  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
[    8.801321][  T167] RSP: 0018:ffa0000000847c58 EFLAGS: 00010286
[    8.801520][  T167] RAX: 00000000ffffffa6 RBX: ff110000094c5540 RCX: 1ff4000000108f51
[    8.801741][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000094c55f0
[    8.801980][  T167] RBP: ff11000008a00000 R08: 1fe2200001298abf R09: ff1100000c442e58
[    8.802201][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000000
[    8.802426][  T167] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000002
[    8.802649][  T167] FS:  0000000025f7f400(0000) GS:ff110000a70d3000(0000) knlGS:0000000000000000
[    8.802910][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.803117][  T167] CR2: 00007f35fc495000 CR3: 000000000c5a2003 CR4: 0000000000771ef0
[    8.803340][  T167] PKRU: 55555554
[    8.803477][  T167] Call Trace:
[    8.803612][  T167]  <TASK>
[    8.803719][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    8.803893][  T167]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    8.804071][  T167]  notifier_call_chain (kernel/notifier.c:85)
[    8.804240][  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)
[    8.804407][  T167]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    8.804602][  T167]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    8.804802][  T167]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    8.805001][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.805172][  T167]  ? update_socket_protocol+0x10/0x10
[    8.805337][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[    8.805505][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.805698][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.805874][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.806050][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.806221][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.806427][  T167] RIP: 0033:0x47cc8d
[    8.806567][  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 
[    8.807045][  T167] RSP: 002b:00007fffd58efca0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.807272][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.807495][  T167] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    8.807717][  T167] RBP: 00007fffd58efcf0 R08: 0000000000000000 R09: 0000000000000000
[    8.807982][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffd58f01b8
[    8.808207][  T167] R13: 00007fffd58f0240 R14: 0000000000000002 R15: 0000000000543540
| [    8.810308][  T167] ------------[ cut here ]------------
| [    8.810473][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/167
| [    8.810766][  T167] Modules linked in:
| [    8.811303][  T167] Tainted: [W]=WARN
[    8.811442][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.811645][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.811864][  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
[    8.812369][  T167] RSP: 0018:ffa0000000847850 EFLAGS: 00010286
[    8.812574][  T167] RAX: 00000000ffffffa6 RBX: ff110000094c41c0 RCX: 1ff4000000108ed0
[    8.812809][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000094c4270
[    8.813058][  T167] RBP: ff11000008a00000 R08: 1fe220000129884f R09: ff1100000c442e58
[    8.813292][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000001
[    8.813524][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000005860900
[    8.813761][  T167] FS:  0000000025f7f400(0000) GS:ff110000a70d3000(0000) knlGS:0000000000000000
[    8.814048][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.814252][  T167] CR2: 00007f35fc495000 CR3: 000000000c5a2003 CR4: 0000000000771ef0
[    8.814488][  T167] PKRU: 55555554
[    8.814628][  T167] Call Trace:
[    8.814768][  T167]  <TASK>
[    8.814888][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.815079][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.815223][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    8.815397][  T167]  __dev_notify_flags (net/core/dev.c:9787)
[    8.815571][  T167]  ? netif_change_name (net/core/dev.c:1495)
[    8.815744][  T167]  ? __dev_change_flags (net/core/dev.c:9752)
[    8.815920][  T167]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    8.816106][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    8.816284][  T167]  netif_change_flags (net/core/dev.c:9820)
[    8.816458][  T167]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    8.816632][  T167]  dev_change_flags (net/core/dev_api.c:68)
[    8.816829][  T167]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    8.817026][  T167]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    8.817199][  T167]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    8.817373][  T167]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    8.817520][  T167]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    8.817692][  T167]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    8.817879][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.818063][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    8.818238][  T167]  sock_do_ioctl (net/socket.c:1313)
[    8.818413][  T167]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    8.818588][  T167]  ? ioctl_file_clone (fs/ioctl.c:244)
[    8.818764][  T167]  sock_ioctl (net/socket.c:1434)
[    8.818943][  T167]  ? br_ioctl_call (net/socket.c:1279)
[    8.819133][  T167]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    8.819320][  T167]  ? update_socket_protocol+0x10/0x10
[    8.819493][  T167]  ? alloc_file_clone (fs/file_table.c:477)
[    8.819669][  T167]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    8.819851][  T167]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.820036][  T167]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.820210][  T167]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.820389][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.820592][  T167] RIP: 0033:0x47cc8d
[    8.820738][  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 
[    8.821247][  T167] RSP: 002b:00007fffd58efc80 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    8.821487][  T167] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    8.821720][  T167] RDX: 00007fffd58efcf0 RSI: 0000000000008914 RDI: 0000000000000006
[    8.821975][  T167] RBP: 00007fffd58efcd0 R08: 0000000000000000 R09: 0000000000000000
[    8.822209][  T167] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffd58f01b8
[    8.822447][  T167] R13: 00007fffd58f0240 R14: 0000000000000002 R15: 0000000000543540
| [   98.607357][  T167] ------------[ cut here ]------------
| [   98.607614][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/167
| [   98.607944][  T167] Modules linked in:
| [   98.608722][  T167] Tainted: [W]=WARN
[   98.608976][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.609303][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.609582][  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
[   98.610209][  T167] RSP: 0018:ffa00000008476f0 EFLAGS: 00010286
[   98.610516][  T167] RAX: 00000000ffffffa6 RBX: ff11000004b439c0 RCX: 1ff4000000108ea4
[   98.610812][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004b43a70
[   98.611163][  T167] RBP: ff11000008a00000 R08: 1fe220000096874f R09: ff1100000c442e58
[   98.611499][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000041
[   98.611793][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: ffa0000000847790
[   98.612154][  T167] FS:  0000000000000000(0000) GS:ff110000a70d3000(0000) knlGS:0000000000000000
[   98.612525][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.612739][  T167] CR2: 00007f759b8b26f0 CR3: 0000000034739006 CR4: 0000000000771ef0
[   98.612996][  T167] PKRU: 55555554
[   98.613150][  T167] Call Trace:
[   98.613296][  T167]  <TASK>
[   98.613411][  T167]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   98.613593][  T167]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   98.613742][  T167]  netif_close_many (net/core/dev.c:1804)
[   98.613923][  T167]  ? asym_cpu_capacity_scan (./include/linux/rculist.h:103)
[   98.614114][  T167]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.614300][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.614479][  T167]  ? __dev_close_many (net/core/dev.c:1781)
[   98.614659][  T167]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   98.614873][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   98.615097][  T167]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   98.615296][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.615507][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.615689][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.615868][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.616064][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.616255][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.616433][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.616610][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.616792][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.616984][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.617171][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.617355][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.617537][  T167]  __fput (fs/file_table.c:510)
[   98.617689][  T167]  task_work_run (kernel/task_work.c:233)
[   98.617868][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.618061][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[   98.618250][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.618432][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.618581][  T167]  ? exit_notify (kernel/exit.c:748)
[   98.618758][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.618940][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.619138][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.619320][  T167]  do_group_exit (kernel/exit.c:1119)
[   98.619500][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.619795][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.619988][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.620177][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.620356][  T167]  get_signal (kernel/signal.c:3037)
[   98.620539][  T167]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.620891][  T167]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.621082][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[   98.621278][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.621564][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.621762][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.621989][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.622219][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.622553][  T167]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.622761][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.622960][  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)
[   98.623241][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.623424][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.623637][  T167] RIP: 0033:0x4c2d9e
[   98.623884][  T167] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.624138][  T167] RSP: 002b:00007fffd58ef610 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.624389][  T167] RAX: 0000000000000014 RBX: 0000000000000012 RCX: 00000000004c2d9e
[   98.624632][  T167] RDX: 0000000000000014 RSI: 00007fffd58ef6f0 RDI: 0000000000000007
[   98.624877][  T167] RBP: 00007fffd58ef620 R08: 00007fffd58ef6b0 R09: 000000000000000c
[   98.625139][  T167] R10: 0000000000000000 R11: 0000000000000202 R12: 00007fffd58f01b8
[   98.625385][  T167] R13: 00007fffd58f0240 R14: 00007fffd58ef7e0 R15: 0000000000543540
| [   98.631847][  T167] ------------[ cut here ]------------
| [   98.632497][  T167] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: packetdrill/167
| [   98.633284][  T167] Modules linked in:
| [   98.634741][  T167] Tainted: [W]=WARN
[   98.635237][  T167] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.635451][  T167] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.635666][  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
[   98.636191][  T167] RSP: 0018:ffa0000000847820 EFLAGS: 00010286
[   98.636400][  T167] RAX: 00000000ffffffa6 RBX: ff1100000ce993c0 RCX: 1ff4000000108eca
[   98.636636][  T167] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000ce99470
[   98.636873][  T167] RBP: ff11000008a00000 R08: 1fe22000019d328f R09: ff1100000c442e58
[   98.637120][  T167] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[   98.637363][  T167] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.637603][  T167] FS:  0000000000000000(0000) GS:ff110000a70d3000(0000) knlGS:0000000000000000
[   98.637873][  T167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.638094][  T167] CR2: 00007f759b8b26f0 CR3: 0000000034739006 CR4: 0000000000771ef0
[   98.638338][  T167] PKRU: 55555554
[   98.638480][  T167] Call Trace:
[   98.638626][  T167]  <TASK>
[   98.638740][  T167]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.639007][  T167]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.639223][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.639397][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.639571][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.639747][  T167]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   98.639922][  T167]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   98.640109][  T167]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   98.640294][  T167]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   98.640469][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.640641][  T167]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   98.640816][  T167]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   98.641003][  T167]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   98.641188][  T167]  __fput (fs/file_table.c:510)
[   98.641337][  T167]  task_work_run (kernel/task_work.c:233)
[   98.641513][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.641684][  T167]  ? task_work_cancel (kernel/task_work.c:190)
[   98.641858][  T167]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   98.642046][  T167]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   98.642198][  T167]  ? exit_notify (kernel/exit.c:748)
[   98.642370][  T167]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   98.642544][  T167]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.642718][  T167]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   98.642895][  T167]  do_group_exit (kernel/exit.c:1119)
[   98.643081][  T167]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   98.643292][  T167]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   98.643465][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   98.643641][  T167]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   98.643815][  T167]  get_signal (kernel/signal.c:3037)
[   98.644001][  T167]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   98.644184][  T167]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   98.644357][  T167]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[   98.644535][  T167]  ? ptrace_signal (./include/linux/signal.h:87)
[   98.644714][  T167]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   98.644894][  T167]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   98.645083][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.645266][  T167]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.645474][  T167]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   98.645648][  T167]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.645825][  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)
[   98.646013][  T167]  ? irq_exit_rcu (kernel/softirq.c:754)
[   98.646195][  T167]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   98.646397][  T167] RIP: 0033:0x4c2d9e
[   98.646545][  T167] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   98.646753][  T167] RSP: 002b:00007fffd58ef610 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   98.647005][  T167] RAX: 0000000000000014 RBX: 0000000000000012 RCX: 00000000004c2d9e
[   98.647253][  T167] RDX: 0000000000000014 RSI: 00007fffd58ef6f0 RDI: 0000000000000007
[   98.647487][  T167] RBP: 00007fffd58ef620 R08: 00007fffd58ef6b0 R09: 000000000000000c
[   98.647749][  T167] R10: 0000000000000000 R11: 0000000000000202 R12: 00007fffd58f01b8
[   98.647997][  T167] R13: 00007fffd58f0240 R14: 00007fffd58ef7e0 R15: 0000000000543540
| [   98.664442][   T67] ------------[ cut here ]------------
| [   98.664612][   T67] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: 1/67
| [   98.664886][   T67] Modules linked in:
| [   98.665727][   T67] Tainted: [W]=WARN
[   98.665868][   T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.666067][   T67] Workqueue: netns cleanup_net
[   98.666204][   T67] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   98.666363][   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
[   98.666785][   T67] RSP: 0018:ffa0000000487878 EFLAGS: 00010286
[   98.666940][   T67] RAX: 00000000ffffffa6 RBX: ff1100000ce98340 RCX: 1ff4000000090ed5
[   98.667174][   T67] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000ce983f0
[   98.667353][   T67] RBP: ff11000008841000 R08: 1fe22000019d307f R09: ff11000008bd8bd0
[   98.667530][   T67] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   98.667714][   T67] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   98.667893][   T67] FS:  0000000000000000(0000) GS:ff110000a6fd3000(0000) knlGS:0000000000000000
[   98.668157][   T67] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.668308][   T67] CR2: 00007f46fbbe4f98 CR3: 0000000034739004 CR4: 0000000000771ef0
[   98.668486][   T67] PKRU: 55555554
[   98.668577][   T67] Call Trace:
[   98.668666][   T67]  <TASK>
[   98.668728][   T67]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   98.668886][   T67]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   98.669084][   T67]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   98.669212][   T67]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   98.669331][   T67]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   98.669451][   T67]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   98.669572][   T67]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   98.669690][   T67]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   98.669807][   T67]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   98.669930][   T67]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   98.670100][   T67]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   98.670227][   T67]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   98.670349][   T67]  cleanup_net (net/core/net_namespace.c:702)
[   98.670472][   T67]  ? net_passive_dec (./include/linux/llist.h:241)
[   98.670592][   T67]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   98.670713][   T67]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   98.670837][   T67]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   98.671003][   T67]  process_one_work (kernel/workqueue.c:3314)
[   98.671134][   T67]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   98.671254][   T67]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   98.671379][   T67]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   98.671500][   T67]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.671624][   T67]  ? __kthread_parkme (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 kernel/kthread.c:272)
[   98.671744][   T67]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   98.671864][   T67]  kthread (kernel/kthread.c:436)
[   98.671978][   T67]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   98.672137][   T67]  ? kthread_affine_node (kernel/kthread.c:378)
[   98.672257][   T67]  ret_from_fork (arch/x86/kernel/process.c:158)
[   98.672379][   T67]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   98.672534][   T67]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   98.672654][   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