======================================
| xx__-> [    9.597578][  T166] ------------[ cut here ]------------
| [    9.597802][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: unshare/166
| [    9.598090][  T166] Modules linked in:
| [    9.598511][  T166] Tainted: [W]=WARN
[    9.598620][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.598802][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.599027][  T166] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    9.599513][  T166] RSP: 0018:ffa0000000847ab0 EFLAGS: 00010286
[    9.599695][  T166] RAX: 00000000ffffffa6 RBX: ff1100000b39c940 RCX: 1ff4000000108f1c
[    9.599908][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000b39c9f0
[    9.600113][  T166] RBP: ff11000007c59000 R08: 1fe220000167393f R09: ff11000009d55180
[    9.600320][  T166] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[    9.600526][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000007c59000
[    9.600744][  T166] FS:  00007f8a44582740(0000) GS:ff1100008d5d3000(0000) knlGS:0000000000000000
[    9.601040][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.601213][  T166] CR2: 00005623ab403310 CR3: 000000000bf25006 CR4: 0000000000771ef0
[    9.601432][  T166] PKRU: 55555554
[    9.601536][  T166] Call Trace:
[    9.601642][  T166]  <TASK>
[    9.601714][  T166]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    9.601860][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.602000][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    9.602140][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.602247][  T166]  register_netdevice (net/core/dev.c:11488)
[    9.602387][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    9.602559][  T166]  register_netdev (net/core/dev.c:11552)
[    9.602703][  T166]  loopback_net_init (drivers/net/loopback.c:218)
[    9.603194][  T166]  ops_init (net/core/net_namespace.c:137)
[    9.603302][  T166]  setup_net (net/core/net_namespace.c:446)
[    9.603405][  T166]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    9.603540][  T166]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    9.603683][  T166]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    9.603826][  T166]  copy_net_ns (net/core/net_namespace.c:579)
[    9.603963][  T166]  create_new_namespaces (kernel/nsproxy.c:132)
[    9.604105][  T166]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    9.604240][  T166]  ksys_unshare (kernel/fork.c:3243)
[    9.604378][  T166]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    9.604517][  T166]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    9.604659][  T166]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    9.604796][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.604936][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.605074][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.605212][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.605380][  T166] RIP: 0033:0x7f8a4467dbcb
[    9.605523][  T166] Code: 73 01 c3 48 8b 0d 2d 82 0f 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d fd 81 0f 00 f7 d8 64 89 01 48
All code
========
   0:	73 01                	jae    0x3
   2:	c3                   	ret
   3:	48 8b 0d 2d 82 0f 00 	mov    0xf822d(%rip),%rcx        # 0xf8237
   a:	f7 d8                	neg    %eax
   c:	64 89 01             	mov    %eax,%fs:(%rcx)
   f:	48 83 c8 ff          	or     $0xffffffffffffffff,%rax
  13:	c3                   	ret
  14:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  1b:	00 00 00 
  1e:	90                   	nop
  1f:	f3 0f 1e fa          	endbr64
  23:	b8 10 01 00 00       	mov    $0x110,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax		<-- trapping instruction
  30:	73 01                	jae    0x33
  32:	c3                   	ret
  33:	48 8b 0d fd 81 0f 00 	mov    0xf81fd(%rip),%rcx        # 0xf8237
  3a:	f7 d8                	neg    %eax
  3c:	64 89 01             	mov    %eax,%fs:(%rcx)
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax
   6:	73 01                	jae    0x9
   8:	c3                   	ret
   9:	48 8b 0d fd 81 0f 00 	mov    0xf81fd(%rip),%rcx        # 0xf820d
  10:	f7 d8                	neg    %eax
  12:	64 89 01             	mov    %eax,%fs:(%rcx)
  15:	48                   	rex.W
[    9.606020][  T166] RSP: 002b:00007ffd4b4a6b48 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    9.606227][  T166] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8a4467dbcb
[    9.606429][  T166] RDX: 0000000000000000 RSI: 00007ffd4b4a68b0 RDI: 0000000040000000
[    9.606636][  T166] RBP: 00007ffd4b4a6ed0 R08: 00007ffd4b4a6aa0 R09: 0000000000000000
[    9.606844][  T166] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    9.607049][  T166] R13: 0000000000000000 R14: 00000000ffffffff R15: 00005623ab406b68
| [    9.631839][  T166] ------------[ cut here ]------------
| [    9.632063][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#1: packetdrill/166
| [    9.632445][  T166] Modules linked in:
| [    9.633053][  T166] Tainted: [W]=WARN
[    9.633199][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.633439][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.633696][  T166] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    9.634389][  T166] RSP: 0018:ffa0000000847b58 EFLAGS: 00010286
[    9.634634][  T166] RAX: 00000000ffffffa6 RBX: ff1100000948a340 RCX: 1ff4000000108f31
[    9.634926][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000948a3f0
[    9.635212][  T166] RBP: ff11000009260000 R08: 1fe220000129147f R09: ff11000009d55158
[    9.635502][  T166] R10: 0000000000000001 R11: 0000000000000001 R12: 00000000ffffffff
[    9.635791][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000009260000
[    9.636084][  T166] FS:  0000000020820400(0000) GS:ff1100008d653000(0000) knlGS:0000000000000000
[    9.636416][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.636667][  T166] CR2: 00007f8706c53000 CR3: 000000000e112002 CR4: 0000000000771ef0
[    9.636970][  T166] PKRU: 55555554
[    9.637115][  T166] Call Trace:
[    9.637258][  T166]  <TASK>
[    9.637357][  T166]  ? ip6_route_dev_notify (./include/net/net_namespace.h:419 (discriminator 1) ./include/linux/netdevice.h:2776 (discriminator 1) net/ipv6/route.c:6476 (discriminator 1))
[    9.637549][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.637744][  T166]  ? notifier_call_chain (kernel/notifier.c:85)
[    9.637948][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.638095][  T166]  register_netdevice (net/core/dev.c:11488)
[    9.638291][  T166]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    9.638527][  T166]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    9.638727][  T166]  tun_set_iff.constprop.0 (drivers/net/tun.c:2876)
[    9.638928][  T166]  ? tun_attach.isra.0 (./include/linux/ptr_ring.h:601)
[    9.639118][  T166]  ? tun_get (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) drivers/net/tun.c:803 (discriminator 2))
[    9.639267][  T166]  __tun_chr_ioctl (drivers/net/tun.c:3157)
[    9.639456][  T166]  ? build_open_flags (fs/open.c:1212)
[    9.639657][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    9.639857][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[    9.640052][  T166]  ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
[    9.640242][  T166]  ? fput_close_sync (fs/file_table.c:615)
[    9.640433][  T166]  ? __ia32_sys_open (fs/open.c:1374)
[    9.640634][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.640834][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.641025][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.641216][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.641406][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.641645][  T166] RIP: 0033:0x47cc8d
[    9.641797][  T166] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[    9.642486][  T166] RSP: 002b:00007ffdd2494030 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.642781][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.643070][  T166] RDX: 00007ffdd24940b0 RSI: 00000000400454ca RDI: 0000000000000005
[    9.643359][  T166] RBP: 00007ffdd2494080 R08: 0000000000000000 R09: 0000000000000000
[    9.643647][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdd2494588
[    9.643939][  T166] R13: 00007ffdd2494610 R14: 0000000000000002 R15: 0000000000543540
| [    9.658593][  T166] ------------[ cut here ]------------
| [    9.658819][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#1: packetdrill/166
| [    9.659186][  T166] Modules linked in:
| [    9.659766][  T166] Tainted: [W]=WARN
[    9.659921][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.660160][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.660409][  T166] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    9.661103][  T166] RSP: 0018:ffa0000000847c58 EFLAGS: 00010286
[    9.661343][  T166] RAX: 00000000ffffffa6 RBX: ff1100000948a7c0 RCX: 1ff4000000108f51
[    9.661636][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000948a870
[    9.661930][  T166] RBP: ff11000009260000 R08: 1fe220000129150f R09: ff11000009d55158
[    9.662211][  T166] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
[    9.662495][  T166] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000001
[    9.662783][  T166] FS:  0000000020820400(0000) GS:ff1100008d653000(0000) knlGS:0000000000000000
[    9.663127][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.663367][  T166] CR2: 00007f8706c53000 CR3: 000000000e112002 CR4: 0000000000771ef0
[    9.663658][  T166] PKRU: 55555554
[    9.663799][  T166] Call Trace:
[    9.663946][  T166]  <TASK>
[    9.664046][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    9.664236][  T166]  rtnetlink_event (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:7121)
[    9.664430][  T166]  notifier_call_chain (kernel/notifier.c:85)
[    9.664624][  T166]  netdev_update_features (net/core/dev.c:2287 net/core/dev.c:2301 net/core/dev.c:1590 net/core/dev.c:11099 net/core/dev.c:11096)
[    9.664830][  T166]  ? netdev_sync_lower_features (net/core/dev.c:10883)
[    9.665068][  T166]  __tun_chr_ioctl (drivers/net/tun.c:2963 drivers/net/tun.c:3285)
[    9.665260][  T166]  ? tun_chr_read_iter (drivers/net/tun.c:2271 (discriminator 1))
[    9.665451][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    9.665649][  T166]  ? update_socket_protocol+0x10/0x10
[    9.665849][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    9.666042][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.666235][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.666425][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.666615][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.666819][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.667055][  T166] RIP: 0033:0x47cc8d
[    9.667206][  T166] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[    9.667900][  T166] RSP: 002b:00007ffdd2494070 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.668189][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.668475][  T166] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    9.668768][  T166] RBP: 00007ffdd24940c0 R08: 0000000000000000 R09: 0000000000000000
[    9.669060][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdd2494588
[    9.669345][  T166] R13: 00007ffdd2494610 R14: 0000000000000002 R15: 0000000000543540
| [    9.672116][  T166] ------------[ cut here ]------------
| [    9.672317][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#1: packetdrill/166
| [    9.672714][  T166] Modules linked in:
| [    9.673480][  T166] Tainted: [W]=WARN
[    9.673634][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.673892][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.674157][  T166] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    9.674886][  T166] RSP: 0018:ffa0000000847850 EFLAGS: 00010286
[    9.675145][  T166] RAX: 00000000ffffffa6 RBX: ff1100000948a040 RCX: 1ff4000000108ed0
[    9.675452][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000948a0f0
[    9.675755][  T166] RBP: ff11000009260000 R08: 1fe220000129141f R09: ff11000009d55158
[    9.676058][  T166] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
[    9.676350][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000005830900
[    9.676649][  T166] FS:  0000000020820400(0000) GS:ff1100008d653000(0000) knlGS:0000000000000000
[    9.677012][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.677274][  T166] CR2: 00007f8706c53000 CR3: 000000000e112002 CR4: 0000000000771ef0
[    9.677575][  T166] PKRU: 55555554
[    9.677732][  T166] Call Trace:
[    9.677882][  T166]  <TASK>
[    9.677987][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.678190][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.678338][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    9.678533][  T166]  __dev_notify_flags (net/core/dev.c:9787)
[    9.678742][  T166]  ? netif_change_name (net/core/dev.c:1495)
[    9.678946][  T166]  ? __dev_change_flags (net/core/dev.c:9752)
[    9.679144][  T166]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    9.679343][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    9.679544][  T166]  netif_change_flags (net/core/dev.c:9820)
[    9.679751][  T166]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[    9.679960][  T166]  dev_change_flags (net/core/dev_api.c:68)
[    9.680168][  T166]  devinet_ioctl (net/ipv4/devinet.c:1199)
[    9.680374][  T166]  ? inet_ifa_byprefix (net/ipv4/devinet.c:619 (discriminator 9))
[    9.680573][  T166]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[    9.680789][  T166]  inet_ioctl (net/ipv4/af_inet.c:1011)
[    9.680963][  T166]  ? inet_dgram_connect (net/ipv4/af_inet.c:589)
[    9.681159][  T166]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    9.681364][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    9.681555][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    9.681751][  T166]  sock_do_ioctl (net/socket.c:1313)
[    9.681952][  T166]  ? __sock_recv_cmsgs (./include/net/sock.h:2867)
[    9.682151][  T166]  ? ioctl_file_clone (fs/ioctl.c:244)
[    9.682351][  T166]  sock_ioctl (net/socket.c:1434)
[    9.682501][  T166]  ? br_ioctl_call (net/socket.c:1279)
[    9.682699][  T166]  ? fd_install (./include/linux/rcupdate.h:963 (discriminator 1) fs/file.c:699 (discriminator 1))
[    9.682897][  T166]  ? update_socket_protocol+0x10/0x10
[    9.683092][  T166]  ? alloc_file_clone (fs/file_table.c:477)
[    9.683284][  T166]  __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
[    9.683476][  T166]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.683694][  T166]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.683908][  T166]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.684103][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.684337][  T166] RIP: 0033:0x47cc8d
[    9.684489][  T166] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
All code
========
   0:	04 25                	add    $0x25,%al
   2:	28 00                	sub    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
   a:	31 c0                	xor    %eax,%eax
   c:	48 8d 45 10          	lea    0x10(%rbp),%rax
  10:	c7 45 b0 10 00 00 00 	movl   $0x10,-0x50(%rbp)
  17:	48 89 45 b8          	mov    %rax,-0x48(%rbp)
  1b:	48 8d 45 d0          	lea    -0x30(%rbp),%rax
  1f:	48 89 45 c0          	mov    %rax,-0x40(%rbp)
  23:	b8 10 00 00 00       	mov    $0x10,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  31:	77 1a                	ja     0x4d
  33:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
  37:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  3e:	00 00 

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   7:	77 1a                	ja     0x23
   9:	48 8b 45 c8          	mov    -0x38(%rbp),%rax
   d:	64 48 2b 04 25 28 00 	sub    %fs:0x28,%rax
  14:	00 00 
[    9.685190][  T166] RSP: 002b:00007ffdd2494050 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.685479][  T166] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 000000000047cc8d
[    9.685764][  T166] RDX: 00007ffdd24940c0 RSI: 0000000000008914 RDI: 0000000000000006
[    9.686062][  T166] RBP: 00007ffdd24940a0 R08: 0000000000000000 R09: 0000000000000000
[    9.686347][  T166] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdd2494588
[    9.686636][  T166] R13: 00007ffdd2494610 R14: 0000000000000002 R15: 0000000000543540
| [   99.415613][  T166] ------------[ cut here ]------------
| [   99.415886][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#1: packetdrill/166
| [   99.416168][  T166] Modules linked in:
| [   99.416573][  T166] Tainted: [W]=WARN
[   99.416674][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   99.416924][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   99.417096][  T166] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   99.417654][  T166] RSP: 0018:ffa00000008476f0 EFLAGS: 00010286
[   99.417905][  T166] RAX: 00000000ffffffa6 RBX: ff1100000c050ac0 RCX: 1ff4000000108ea4
[   99.418099][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000c050b70
[   99.418294][  T166] RBP: ff11000009260000 R08: 1fe220000180a16f R09: ff11000009d55158
[   99.418488][  T166] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000041
[   99.418685][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: ffa0000000847790
[   99.418956][  T166] FS:  0000000000000000(0000) GS:ff1100008d653000(0000) knlGS:0000000000000000
[   99.419185][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   99.419348][  T166] CR2: 0000564224868140 CR3: 0000000013739006 CR4: 0000000000771ef0
[   99.419544][  T166] PKRU: 55555554
[   99.419643][  T166] Call Trace:
[   99.419740][  T166]  <TASK>
[   99.419807][  T166]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   99.420034][  T166]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   99.420133][  T166]  netif_close_many (net/core/dev.c:1804)
[   99.420264][  T166]  ? asym_cpu_capacity_scan (./include/linux/rculist.h:103)
[   99.420398][  T166]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   99.420527][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.420660][  T166]  ? __dev_close_many (net/core/dev.c:1781)
[   99.420794][  T166]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   99.421044][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   99.421205][  T166]  ? select_fallback_rq (kernel/sched/sched.h:1383)
[   99.421334][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   99.421493][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.421624][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.421755][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.421944][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   99.422079][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   99.422208][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   99.422337][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   99.422468][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.422601][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   99.422731][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   99.422927][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   99.423059][  T166]  __fput (fs/file_table.c:510)
[   99.423160][  T166]  task_work_run (kernel/task_work.c:233)
[   99.423290][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.423419][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   99.423548][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   99.423682][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   99.423780][  T166]  ? exit_notify (kernel/exit.c:748)
[   99.423982][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.424114][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.424242][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   99.424373][  T166]  do_group_exit (kernel/exit.c:1119)
[   99.424505][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   99.424667][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.424794][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   99.424982][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   99.425111][  T166]  get_signal (kernel/signal.c:3037)
[   99.425243][  T166]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   99.425423][  T166]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   99.425587][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[   99.425720][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   99.425917][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   99.426050][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   99.426182][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.426312][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   99.426479][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   99.426614][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.426745][  T166]  do_syscall_64 (./include/linux/irq-entry-common.h:207 ./include/linux/irq-entry-common.h:230 ./include/linux/entry-common.h:318 arch/x86/entry/syscall_64.c:100)
[   99.426935][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   99.427065][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   99.427225][  T166] RIP: 0033:0x4c2d9e
[   99.427331][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   99.427513][  T166] RSP: 002b:00007ffdd24939e0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   99.427712][  T166] RAX: 0000000000000014 RBX: 0000000000000012 RCX: 00000000004c2d9e
[   99.427970][  T166] RDX: 0000000000000014 RSI: 00007ffdd2493ac0 RDI: 0000000000000007
[   99.428168][  T166] RBP: 00007ffdd24939f0 R08: 00007ffdd2493a80 R09: 000000000000000c
[   99.428363][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffdd2494588
[   99.428557][  T166] R13: 00007ffdd2494610 R14: 00007ffdd2493bb0 R15: 0000000000543540
| [   99.442021][  T166] ------------[ cut here ]------------
| [   99.442191][  T166] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#1: packetdrill/166
| [   99.442457][  T166] Modules linked in:
| [   99.442864][  T166] Tainted: [W]=WARN
[   99.442963][  T166] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   99.443122][  T166] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   99.443289][  T166] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 38 ff f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 38 ff f0 ff       	call   0xfffffffffff0ff74
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 38 ff f0 ff       	call   0xfffffffffff0ff4a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   99.443749][  T166] RSP: 0018:ffa0000000847820 EFLAGS: 00010286
[   99.443922][  T166] RAX: 00000000ffffffa6 RBX: ff1100000c067240 RCX: 1ff4000000108eca
[   99.444114][  T166] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000c0672f0
[   99.444306][  T166] RBP: ff11000009260000 R08: 1fe220000180ce5f R09: ff11000009d55158
[   99.444496][  T166] R10: 0000000000000001 R11: 0000000000000001 R12: 00000000ffffffff
[   99.444696][  T166] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   99.444895][  T166] FS:  0000000000000000(0000) GS:ff1100008d653000(0000) knlGS:0000000000000000
[   99.445123][  T166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   99.445288][  T166] CR2: 0000564224868140 CR3: 0000000013739006 CR4: 0000000000771ef0
[   99.445479][  T166] PKRU: 55555554
[   99.445575][  T166] Call Trace:
[   99.445671][  T166]  <TASK>
[   99.445739][  T166]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   99.445917][  T166]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   99.446075][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.446203][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.446330][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.446457][  T166]  ? __queue_work (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/workqueue.c:2402 (discriminator 2))
[   99.446592][  T166]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309 net/core/dev.c:12299)
[   99.446719][  T166]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   99.446853][  T166]  ? unregister_netdevice_many (net/core/dev.c:12497)
[   99.446985][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.447114][  T166]  ? queue_delayed_work_on (kernel/workqueue.c:2616 (discriminator 6))
[   99.447242][  T166]  __tun_detach (./include/linux/netdevice.h:3455 drivers/net/tun.c:628)
[   99.447372][  T166]  tun_chr_close (drivers/net/tun.c:644 drivers/net/tun.c:3505)
[   99.447498][  T166]  __fput (fs/file_table.c:510)
[   99.447600][  T166]  task_work_run (kernel/task_work.c:233)
[   99.447730][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.448389][  T166]  ? task_work_cancel (kernel/task_work.c:190)
[   99.448528][  T166]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6250 mm/slub.c:6377)
[   99.448659][  T166]  do_exit (./include/linux/task_work.h:40 kernel/exit.c:976)
[   99.448756][  T166]  ? exit_notify (kernel/exit.c:748)
[   99.449336][  T166]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   99.449468][  T166]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.449595][  T166]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   99.449726][  T166]  do_group_exit (kernel/exit.c:1119)
[   99.449855][  T166]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   99.450023][  T166]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   99.450152][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[   99.450312][  T166]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[   99.450497][  T166]  get_signal (kernel/signal.c:3037)
[   99.450693][  T166]  ? __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[   99.450906][  T166]  ? __ia32_sys_getpeername (net/socket.c:2219)
[   99.451076][  T166]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[   99.451260][  T166]  ? ptrace_signal (./include/linux/signal.h:87)
[   99.451451][  T166]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[   99.451645][  T166]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[   99.451863][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.452021][  T166]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   99.452183][  T166]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[   99.452311][  T166]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.452438][  T166]  do_syscall_64 (./include/linux/irq-entry-common.h:207 ./include/linux/irq-entry-common.h:230 ./include/linux/entry-common.h:318 arch/x86/entry/syscall_64.c:100)
[   99.452566][  T166]  ? irq_exit_rcu (kernel/softirq.c:754)
[   99.452691][  T166]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   99.452854][  T166] RIP: 0033:0x4c2d9e
[   99.452964][  T166] Code: Unable to access opcode bytes at 0x4c2d74.

Code starting with the faulting instruction
===========================================
[   99.453128][  T166] RSP: 002b:00007ffdd24939e0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   99.453324][  T166] RAX: 0000000000000014 RBX: 0000000000000012 RCX: 00000000004c2d9e
[   99.453514][  T166] RDX: 0000000000000014 RSI: 00007ffdd2493ac0 RDI: 0000000000000007
[   99.453705][  T166] RBP: 00007ffdd24939f0 R08: 00007ffdd2493a80 R09: 000000000000000c
[   99.453906][  T166] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffdd2494588
[   99.454098][  T166] R13: 00007ffdd2494610 R14: 00007ffdd2493bb0 R15: 0000000000543540
| [   99.468075][   T12] ------------[ cut here ]------------
| [   99.468291][   T12] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: 0/12
| [   99.468578][   T12] Modules linked in:
| [   99.469413][   T12] Tainted: [W]=WARN
[   99.469664][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   99.470049][   T12] Workqueue: netns cleanup_net
[   99.470248][   T12] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   99.470448][   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
[   99.470953][   T12] RSP: 0018:ffa00000000c7878 EFLAGS: 00010286
[   99.471158][   T12] RAX: 00000000ffffffa6 RBX: ff1100000c067b40 RCX: 1ff4000000018ed5
[   99.471403][   T12] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000c067bf0
[   99.471633][   T12] RBP: ff11000007c59000 R08: 1fe220000180cf7f R09: ff11000001afd1d0
[   99.471878][   T12] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[   99.472103][   T12] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   99.472329][   T12] FS:  0000000000000000(0000) GS:ff1100008d6d3000(0000) knlGS:0000000000000000
[   99.472586][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   99.472781][   T12] CR2: 00007f9d7400c620 CR3: 0000000013739002 CR4: 0000000000771ef0
[   99.473028][   T12] PKRU: 55555554
[   99.473162][   T12] Call Trace:
[   99.473298][   T12]  <TASK>
[   99.473408][   T12]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   99.473632][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   99.473873][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   99.474063][   T12]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   99.474245][   T12]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   99.474413][   T12]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   99.474604][   T12]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   99.474782][   T12]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   99.474978][   T12]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   99.475159][   T12]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   99.475329][   T12]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   99.475491][   T12]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   99.475662][   T12]  cleanup_net (net/core/net_namespace.c:702)
[   99.475843][   T12]  ? net_passive_dec (./include/linux/llist.h:241)
[   99.476021][   T12]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   99.476188][   T12]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   99.476353][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   99.476522][   T12]  process_one_work (kernel/workqueue.c:3314)
[   99.476693][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   99.476880][   T12]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   99.477087][   T12]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   99.477327][   T12]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   99.477558][   T12]  kthread (kernel/kthread.c:436)
[   99.477745][   T12]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   99.478041][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[   99.478221][   T12]  ret_from_fork (arch/x86/kernel/process.c:158)
[   99.478390][   T12]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   99.478586][   T12]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   99.478752][   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