======================================
| xx__-> [    9.363703][  T175] ------------[ cut here ]------------
| [    9.364103][  T175] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: python3/175
| [    9.364491][  T175] Modules linked in: netdevsim
| [    9.365380][  T175] Tainted: [W]=WARN
[    9.365552][  T175] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.365816][  T175] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.366097][  T175] 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
[    9.366784][  T175] RSP: 0018:ffa0000000857500 EFLAGS: 00010286
[    9.367056][  T175] RAX: 00000000ffffffa6 RBX: ff1100000c8bde40 RCX: 1ff400000010ae66
[    9.367350][  T175] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000c8bdef0
[    9.367648][  T175] RBP: ff11000005f9a000 R08: 1fe2200001917bdf R09: ff1100000db8d248
[    9.367944][  T175] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[    9.368250][  T175] R13: 0000000000000000 R14: 0000000000000000 R15: ff11000005f9a000
[    9.368544][  T175] FS:  00007f6d62246400(0000) GS:ff11000082a79000(0000) knlGS:0000000000000000
[    9.368891][  T175] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.369156][  T175] CR2: 00007f9ea6f81808 CR3: 0000000005bf8006 CR4: 0000000000771ef0
[    9.369448][  T175] PKRU: 55555554
[    9.369627][  T175] Call Trace:
[    9.369799][  T175]  <TASK>
[    9.369933][  T175]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.370162][  T175]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.370336][  T175]  register_netdevice (net/core/dev.c:11488)
[    9.370550][  T175]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    9.370814][  T175]  ? __debugfs_create_file (fs/debugfs/inode.c:412 fs/debugfs/inode.c:452)
[    9.371050][  T175] nsim_init_netdevsim (drivers/net/netdevsim/netdev.c:1069) netdevsim
[    9.371312][  T175] nsim_create (drivers/net/netdevsim/netdev.c:1151) netdevsim
[    9.371529][  T175] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1509) netdevsim
[    9.371792][  T175]  ? add_timer_on (kernel/time/timer.c:925 (discriminator 5))
[    9.372022][  T175]  ? nsim_dev_get_vfs (drivers/net/netdevsim/dev.c:65) netdevsim
[    9.372289][  T175]  ? 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))
[    9.372502][  T175]  ? static_obj (kernel/locking/lockdep.c:858)
[    9.372684][  T175]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    9.372902][  T175]  ? nsim_dev_hwstats_init (./include/linux/workqueue.h:713 ./include/linux/workqueue.h:855 drivers/net/netdevsim/hwstats.c:439) netdevsim
[    9.373173][  T175] nsim_drv_probe (drivers/net/netdevsim/dev.c:1570 drivers/net/netdevsim/dev.c:1731) netdevsim
[    9.373390][  T175]  call_driver_probe (drivers/base/dd.c:629)
[    9.373611][  T175]  really_probe (drivers/base/dd.c:709)
[    9.373827][  T175]  ? driver_probe_device (drivers/base/dd.c:135)
[    9.374053][  T175]  __driver_probe_device (drivers/base/dd.c:871)
[    9.374266][  T175]  driver_probe_device (drivers/base/dd.c:901)
[    9.374479][  T175]  __device_attach_driver (drivers/base/dd.c:1029)
[    9.374700][  T175]  bus_for_each_drv (drivers/base/bus.c:500)
[    9.374916][  T175]  ? bus_find_device_reverse (drivers/base/bus.c:442)
[    9.375145][  T175]  __device_attach (drivers/base/dd.c:1101)
[    9.375358][  T175]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[    9.375575][  T175]  ? __driver_attach_async_helper (drivers/base/dd.c:1172 (discriminator 1))
[    9.375838][  T175]  ? 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)
[    9.376068][  T175]  ? _raw_spin_unlock (./include/linux/spinlock_api_smp.h:169 (discriminator 1) kernel/locking/spinlock.c:190 (discriminator 1))
[    9.376282][  T175]  device_initial_probe (drivers/base/dd.c:1156)
[    9.376497][  T175]  bus_probe_device (drivers/base/bus.c:613)
[    9.376720][  T175]  device_add (drivers/base/core.c:3706)
[    9.376935][  T175]  ? __fw_devlink_link_to_consumers.isra.0 (./include/linux/property.h:226 (discriminator 3))
[    9.377200][  T175]  ? __init_waitqueue_head (kernel/sched/wait.c:12)
[    9.377412][  T175]  ? pm_runtime_init (drivers/base/power/runtime.c:1859)
[    9.377635][  T175] new_device_store (drivers/net/netdevsim/bus.c:471 drivers/net/netdevsim/bus.c:191) netdevsim
[    9.377891][  T175]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[    9.378115][  T175]  ? new_port_store (drivers/net/netdevsim/bus.c:99) netdevsim
[    9.378369][  T175]  ? 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))
[    9.378585][  T175]  ? sysfs_file_kobj (./include/linux/rcupdate.h:871 ./include/linux/rcupdate.h:1181 fs/sysfs/file.c:24)
[    9.378811][  T175]  ? sysfs_file_ops (fs/sysfs/file.c:38 (discriminator 1))
[    9.379039][  T175]  kernfs_fop_write_iter (fs/kernfs/file.c:352)
[    9.379251][  T175]  ? kernfs_ops (fs/kernfs/file.c:128)
[    9.379423][  T175]  new_sync_write (fs/read_write.c:595)
[    9.379655][  T175]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    9.379876][  T175]  ? new_sync_read (./include/linux/ioprio.h:41)
[    9.380107][  T175]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    9.380319][  T175]  ? ksys_write (fs/read_write.c:740)
[    9.380538][  T175]  vfs_write (fs/read_write.c:688)
[    9.380722][  T175]  ksys_write (fs/read_write.c:740)
[    9.380897][  T175]  ? __ia32_sys_read (fs/read_write.c:724)
[    9.381123][  T175]  ? kernfs_fop_llseek (fs/kernfs/file.c:908)
[    9.381334][  T175]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    9.381548][  T175]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.381770][  T175]  ? irq_exit_rcu (kernel/softirq.c:754)
[    9.381998][  T175]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.382251][  T175] RIP: 0033:0x7f6d623ce08e
[    9.382468][  T175] 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
[    9.383108][  T175] RSP: 002b:00007ffdb31ab060 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[    9.383405][  T175] RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 00007f6d623ce08e
[    9.383705][  T175] RDX: 0000000000000009 RSI: 000055ab8f38c480 RDI: 0000000000000006
[    9.384009][  T175] RBP: 00007ffdb31ab070 R08: 0000000000000000 R09: 0000000000000000
[    9.384298][  T175] R10: 0000000000000000 R11: 0000000000000202 R12: 00007f6d62246390


Finger prints:
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:register_netdevice:nsim_init_netdevsim:nsim_create