======================================
| xx__-> [    9.429680][  T174] ------------[ cut here ]------------
| [    9.429937][  T174] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: ip/174
| [    9.430237][  T174] Modules linked in:
| [    9.430780][  T174] Tainted: [W]=WARN
[    9.430928][  T174] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.431150][  T174] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.431379][  T174] 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 a8 cb 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 a8 cb f0 ff       	call   0xfffffffffff0cbe4
  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 a8 cb f0 ff       	call   0xfffffffffff0cbba
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    9.431965][  T174] RSP: 0018:ffa0000000847aa8 EFLAGS: 00010286
[    9.432189][  T174] RAX: 00000000ffffffa6 RBX: ff11000005318640 RCX: 1ff4000000108f1b
[    9.432454][  T174] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110000053186f0
[    9.432703][  T174] RBP: ff1100000a2ec000 R08: 1fe2200000a630df R09: ff1100000c325180
[    9.432948][  T174] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[    9.433203][  T174] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000a2ec000
[    9.433475][  T174] FS:  00007f248e41c840(0000) GS:ff1100007b479000(0000) knlGS:0000000000000000
[    9.433821][  T174] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.434056][  T174] CR2: 0000000000479648 CR3: 000000000cecf003 CR4: 0000000000771ef0
[    9.434313][  T174] PKRU: 55555554
[    9.434474][  T174] Call Trace:
[    9.434622][  T174]  <TASK>
[    9.434739][  T174]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    9.434922][  T174]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.435114][  T174]  ? notifier_call_chain (kernel/notifier.c:85)
[    9.435311][  T174]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.435475][  T174]  register_netdevice (net/core/dev.c:11488)
[    9.435660][  T174]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    9.435873][  T174]  ? alloc_netdev_mqs (net/core/dev.c:12133)
[    9.436069][  T174]  register_netdev (net/core/dev.c:11552)
[    9.436252][  T174]  loopback_net_init (drivers/net/loopback.c:218)
[    9.436460][  T174]  ops_init (net/core/net_namespace.c:137)
[    9.436617][  T174]  setup_net (net/core/net_namespace.c:446)
[    9.436767][  T174]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    9.436948][  T174]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    9.437142][  T174]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    9.437337][  T174]  copy_net_ns (net/core/net_namespace.c:579)
[    9.437533][  T174]  create_new_namespaces (kernel/nsproxy.c:132)
[    9.437719][  T174]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    9.437904][  T174]  ksys_unshare (kernel/fork.c:3243)
[    9.438101][  T174]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    9.438291][  T174]  ? __ia32_sys_open (fs/open.c:1374)
[    9.438491][  T174]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    9.438672][  T174]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    9.438853][  T174]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.439047][  T174]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.439233][  T174]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.439438][  T174]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.439652][  T174] RIP: 0033:0x7f248e6debcb
[    9.439841][  T174] 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
[    9.440374][  T174] RSP: 002b:00007fff62cf1168 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
[    9.440639][  T174] RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f248e6debcb
[    9.440885][  T174] RDX: 0000000000000000 RSI: 0000000000477309 RDI: 0000000040000000
[    9.441140][  T174] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
[    9.441396][  T174] R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff62cf3390
[    9.441657][  T174] R13: 0000000000000001 R14: 00007f248e41c6f8 R15: 00007fff62cf386a
| [    9.575108][  T173] ------------[ cut here ]------------
| [    9.575346][  T173] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: python3/173
| [    9.575735][  T173] Modules linked in: netdevsim
| [    9.576289][  T173] Tainted: [W]=WARN
[    9.576419][  T173] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.576673][  T173] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.576891][  T173] 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 a8 cb 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 a8 cb f0 ff       	call   0xfffffffffff0cbe4
  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 a8 cb f0 ff       	call   0xfffffffffff0cbba
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    9.577571][  T173] RSP: 0018:ffa00000007f7500 EFLAGS: 00010286
[    9.577783][  T173] RAX: 00000000ffffffa6 RBX: ff1100000a40cc40 RCX: 1ff40000000fee66
[    9.578045][  T173] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000a40ccf0
[    9.578298][  T173] RBP: ff11000008ab2000 R08: 1fe220000148199f R09: ff1100000c322f48
[    9.578553][  T173] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[    9.578798][  T173] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000008ab2000
[    9.579053][  T173] FS:  00007fae5888f400(0000) GS:ff1100007b379000(0000) knlGS:0000000000000000
[    9.579349][  T173] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.579566][  T173] CR2: 00007fae58c900a1 CR3: 0000000005e82001 CR4: 0000000000771ef0
[    9.579816][  T173] PKRU: 55555554
[    9.579941][  T173] Call Trace:
[    9.580071][  T173]  <TASK>
[    9.580159][  T173]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.580335][  T173]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.580468][  T173]  register_netdevice (net/core/dev.c:11488)
[    9.580638][  T173]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    9.580846][  T173]  ? __debugfs_create_file (fs/debugfs/inode.c:412 fs/debugfs/inode.c:452)
[    9.581023][  T173] nsim_init_netdevsim (drivers/net/netdevsim/netdev.c:1069) netdevsim
[    9.581237][  T173] nsim_create (drivers/net/netdevsim/netdev.c:1151) netdevsim
[    9.581411][  T173] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1509) netdevsim
[    9.581624][  T173]  ? add_timer_on (kernel/time/timer.c:925 (discriminator 5))
[    9.581792][  T173]  ? nsim_dev_get_vfs (drivers/net/netdevsim/dev.c:65) netdevsim
[    9.582006][  T173]  ? is_module_address (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) ./include/linux/rcupdate.h:1181 (discriminator 2) kernel/module/main.c:3876 (discriminator 2))
[    9.582174][  T173]  ? static_obj (kernel/locking/lockdep.c:858)
[    9.582308][  T173]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    9.582483][  T173]  ? nsim_dev_hwstats_init (./include/linux/workqueue.h:713 ./include/linux/workqueue.h:855 drivers/net/netdevsim/hwstats.c:439) netdevsim
[    9.582708][  T173] nsim_drv_probe (drivers/net/netdevsim/dev.c:1570 drivers/net/netdevsim/dev.c:1731) netdevsim
[    9.582879][  T173]  call_driver_probe (drivers/base/dd.c:629)
[    9.583049][  T173]  really_probe (drivers/base/dd.c:709)
[    9.583215][  T173]  ? driver_probe_device (drivers/base/dd.c:135)
[    9.583387][  T173]  __driver_probe_device (drivers/base/dd.c:871)
[    9.583561][  T173]  driver_probe_device (drivers/base/dd.c:901)
[    9.583727][  T173]  __device_attach_driver (drivers/base/dd.c:1029)
[    9.583895][  T173]  bus_for_each_drv (drivers/base/bus.c:500)
[    9.584066][  T173]  ? bus_find_device_reverse (drivers/base/bus.c:442)
[    9.584236][  T173]  __device_attach (drivers/base/dd.c:1101)
[    9.584406][  T173]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[    9.584578][  T173]  ? __driver_attach_async_helper (drivers/base/dd.c:1172 (discriminator 1))
[    9.584785][  T173]  ? do_raw_spin_unlock (./include/linux/instrumented.h:82 ./include/linux/atomic/atomic-instrumented.h:32 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141)
[    9.584958][  T173]  ? _raw_spin_unlock (./include/linux/spinlock_api_smp.h:169 (discriminator 1) kernel/locking/spinlock.c:190 (discriminator 1))
[    9.585130][  T173]  device_initial_probe (drivers/base/dd.c:1156)
[    9.585302][  T173]  bus_probe_device (drivers/base/bus.c:613)
[    9.585475][  T173]  device_add (drivers/base/core.c:3706)
[    9.585642][  T173]  ? __fw_devlink_link_to_consumers.isra.0 (./include/linux/property.h:226 (discriminator 3))
[    9.585847][  T173]  ? __init_waitqueue_head (kernel/sched/wait.c:12)
[    9.586019][  T173]  ? pm_runtime_init (drivers/base/power/runtime.c:1859)
[    9.586187][  T173] new_device_store (drivers/net/netdevsim/bus.c:471 drivers/net/netdevsim/bus.c:191) netdevsim
[    9.586404][  T173]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[    9.586577][  T173]  ? new_port_store (drivers/net/netdevsim/bus.c:99) netdevsim
[    9.586784][  T173]  ? sysfs_file_kobj (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) ./include/linux/rcupdate.h:1181 (discriminator 2) fs/sysfs/file.c:24 (discriminator 2))
[    9.586959][  T173]  ? sysfs_file_kobj (./include/linux/rcupdate.h:871 ./include/linux/rcupdate.h:1181 fs/sysfs/file.c:24)
[    9.587126][  T173]  ? sysfs_file_ops (fs/sysfs/file.c:38 (discriminator 1))
[    9.587298][  T173]  kernfs_fop_write_iter (fs/kernfs/file.c:352)
[    9.587469][  T173]  ? kernfs_ops (fs/kernfs/file.c:128)
[    9.587595][  T173]  new_sync_write (fs/read_write.c:595)
[    9.587763][  T173]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    9.587929][  T173]  ? new_sync_read (./include/linux/ioprio.h:41)
[    9.588101][  T173]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    9.588271][  T173]  ? ksys_write (fs/read_write.c:740)
[    9.588447][  T173]  vfs_write (fs/read_write.c:688)
[    9.588574][  T173]  ksys_write (fs/read_write.c:740)
[    9.588699][  T173]  ? __ia32_sys_read (fs/read_write.c:724)
[    9.588865][  T173]  ? kernfs_fop_llseek (fs/kernfs/file.c:908)
[    9.589037][  T173]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    9.589205][  T173]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.589378][  T173]  ? irq_exit_rcu (kernel/softirq.c:754)
[    9.589552][  T173]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.589759][  T173] RIP: 0033:0x7fae58a1708e
[    9.589932][  T173] Code: 4d 89 d8 e8 94 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 03 ff ff ff 0f 1f 00 f3 0f 1e fa
All code
========
   0:	4d 89 d8             	mov    %r11,%r8
   3:	e8 94 bd 00 00       	call   0xbd9c
   8:	4c 8b 5d f8          	mov    -0x8(%rbp),%r11
   c:	41 8b 93 08 03 00 00 	mov    0x308(%r11),%edx
  13:	59                   	pop    %rcx
  14:	5e                   	pop    %rsi
  15:	48 83 f8 fc          	cmp    $0xfffffffffffffffc,%rax
  19:	74 11                	je     0x2c
  1b:	c9                   	leave
  1c:	c3                   	ret
  1d:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  24:	48 8b 45 10          	mov    0x10(%rbp),%rax
  28:	0f 05                	syscall
  2a:*	c9                   	leave		<-- trapping instruction
  2b:	c3                   	ret
  2c:	83 e2 39             	and    $0x39,%edx
  2f:	83 fa 08             	cmp    $0x8,%edx
  32:	75 e7                	jne    0x1b
  34:	e8 03 ff ff ff       	call   0xffffffffffffff3c
  39:	0f 1f 00             	nopl   (%rax)
  3c:	f3 0f 1e fa          	endbr64

Code starting with the faulting instruction
===========================================
   0:	c9                   	leave
   1:	c3                   	ret
   2:	83 e2 39             	and    $0x39,%edx
   5:	83 fa 08             	cmp    $0x8,%edx
   8:	75 e7                	jne    0xfffffffffffffff1
   a:	e8 03 ff ff ff       	call   0xffffffffffffff12
   f:	0f 1f 00             	nopl   (%rax)
  12:	f3 0f 1e fa          	endbr64
[    9.590532][  T173] RSP: 002b:00007fff7893adb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[    9.590782][  T173] RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 00007fae58a1708e
[    9.591034][  T173] RDX: 0000000000000009 RSI: 000055bb9e73c110 RDI: 0000000000000006
[    9.591286][  T173] RBP: 00007fff7893adc0 R08: 0000000000000000 R09: 0000000000000000
[    9.591539][  T173] R10: 0000000000000000 R11: 0000000000000202 R12: 00007fae5888f390
[    9.591785][  T173] R13: 000055bb9e73c110 R14: 0000000000000006 R15: 00007fae5881d0d0
| [   10.163658][   T12] ------------[ cut here ]------------
| [   10.163896][   T12] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: 0/12
| [   10.164161][   T12] Modules linked in: netdevsim
| [   10.164664][   T12] Tainted: [W]=WARN
[   10.164760][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   10.164917][   T12] Workqueue: netns cleanup_net
[   10.165091][   T12] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   10.165253][   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 a8 cb 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 a8 cb f0 ff       	call   0xfffffffffff0cbe4
  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 a8 cb f0 ff       	call   0xfffffffffff0cbba
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   10.165707][   T12] RSP: 0018:ffa00000000c7878 EFLAGS: 00010286
[   10.165864][   T12] RAX: 00000000ffffffa6 RBX: ff1100000a784c40 RCX: 1ff4000000018ed5
[   10.166051][   T12] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000a784cf0
[   10.166234][   T12] RBP: ff1100000a2ec000 R08: 1fe22000014f099f R09: ff11000001b051d0
[   10.166431][   T12] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[   10.166622][   T12] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   10.166804][   T12] FS:  0000000000000000(0000) GS:ff1100007b379000(0000) knlGS:0000000000000000
[   10.167022][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   10.167190][   T12] CR2: 00007f2b400c8620 CR3: 000000002b739003 CR4: 0000000000771ef0
[   10.167383][   T12] PKRU: 55555554
[   10.167482][   T12] Call Trace:
[   10.167574][   T12]  <TASK>
[   10.167639][   T12]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   10.167798][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   10.167958][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   10.168085][   T12]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   10.168208][   T12]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   10.168337][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   10.168470][   T12]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   10.168598][   T12]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   10.168727][   T12]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   10.168851][   T12]  cleanup_net (net/core/net_namespace.c:702)
[   10.168975][   T12]  ? net_passive_dec (./include/linux/llist.h:241)
[   10.169093][   T12]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   10.169214][   T12]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   10.169336][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   10.169464][   T12]  process_one_work (kernel/workqueue.c:3314)
[   10.169588][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   10.169707][   T12]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   10.169830][   T12]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   10.169960][   T12]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   10.170080][   T12]  kthread (kernel/kthread.c:436)
[   10.170176][   T12]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   10.170329][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[   10.170459][   T12]  ret_from_fork (arch/x86/kernel/process.c:158)
[   10.170581][   T12]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   10.170730][   T12]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   10.170851][   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:unregister_netdevice_many_notify:default_device_exit_batch:ops_undo_list:cleanup_net
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:register_netdevice:nsim_init_netdevsim:nsim_create