======================================
| xx__-> [    2.284234] ------------[ cut here ]------------
| [    2.284286] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#1: ethtool-fec.sh/159
| [    2.284351] Modules linked in: netdevsim
| [    2.284449] Tainted: [W]=WARN
[    2.284471] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.284507] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    2.284537] Code: 80 00 00 00 e8 09 d9 ff ff 48 83 c4 38 85 c0 75 18 48 83 c4 08 4c 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 44 8b 48 08 eb b4 90 <0f> 0b 90 ba 02 00 00 00 4c 89 fe 31 ff e8 56 a6 fb ff b9 a6 ff ff
All code
========
   0:	80 00 00             	addb   $0x0,(%rax)
   3:	00 e8                	add    %ch,%al
   5:	09 d9                	or     %ebx,%ecx
   7:	ff                   	(bad)
   8:	ff 48 83             	decl   -0x7d(%rax)
   b:	c4                   	(bad)
   c:	38 85 c0 75 18 48    	cmp    %al,0x481875c0(%rbp)
  12:	83 c4 08             	add    $0x8,%esp
  15:	4c 89 f8             	mov    %r15,%rax
  18:	5b                   	pop    %rbx
  19:	5d                   	pop    %rbp
  1a:	41 5c                	pop    %r12
  1c:	41 5d                	pop    %r13
  1e:	41 5e                	pop    %r14
  20:	41 5f                	pop    %r15
  22:	c3                   	ret
  23:	44 8b 48 08          	mov    0x8(%rax),%r9d
  27:	eb b4                	jmp    0xffffffffffffffdd
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	4c 89 fe             	mov    %r15,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 56 a6 fb ff       	call   0xfffffffffffba692
  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:	4c 89 fe             	mov    %r15,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 56 a6 fb ff       	call   0xfffffffffffba668
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    2.284639] RSP: 0018:ff742bbf003879d0 EFLAGS: 00010286
[    2.284670] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[    2.284716] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1d56b781db0700
[    2.284757] RBP: 0000000000000000 R08: ff1d56b78311f250 R09: ff1d56b7819af030
[    2.284801] R10: ff1d56b78198a118 R11: fefefefefefefeff R12: 0000000000000000
[    2.284844] R13: 0000000000000010 R14: ff1d56b78198a000 R15: ff1d56b781db0700
[    2.284890] FS:  00007fa225589b80(0000) GS:ff1d56b8106da000(0000) knlGS:0000000000000000
[    2.284933] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.284972] CR2: 00005647335e3f78 CR3: 0000000005492006 CR4: 0000000000771ef0
[    2.285014] PKRU: 55555554
[    2.285029] Call Trace:
[    2.285044]  <TASK>
[    2.285061]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4541 net/core/rtnetlink.c:4560)
[    2.285086]  register_netdevice (net/core/dev.c:11488)
[    2.285107] nsim_create (drivers/net/netdevsim/netdev.c:1069 drivers/net/netdevsim/netdev.c:1151) netdevsim
[    2.285138] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1509) netdevsim
[    2.285167] nsim_drv_probe (drivers/net/netdevsim/dev.c:1570 drivers/net/netdevsim/dev.c:1731) netdevsim
[    2.285198]  really_probe (drivers/base/dd.c:631 drivers/base/dd.c:709)
[    2.285229]  ? driver_probe_device (./include/linux/list.h:164 (discriminator 3))
[    2.285261]  __driver_probe_device (drivers/base/dd.c:871)
[    2.285292]  driver_probe_device (drivers/base/dd.c:901)
[    2.285315]  __device_attach_driver (drivers/base/dd.c:1029)
[    2.285349]  bus_for_each_drv (drivers/base/bus.c:500)
[    2.285370]  __device_attach (drivers/base/dd.c:1101)
[    2.285389]  device_initial_probe (drivers/base/dd.c:1156)
[    2.285416]  bus_probe_device (drivers/base/bus.c:613)
[    2.285439]  device_add (drivers/base/core.c:3706)
[    2.285462] new_device_store (drivers/net/netdevsim/bus.c:471 drivers/net/netdevsim/bus.c:191) netdevsim
[    2.285490]  kernfs_fop_write_iter (fs/kernfs/file.c:352)
[    2.285522]  vfs_write (fs/read_write.c:595 fs/read_write.c:688)
[    2.285547]  ksys_write (fs/read_write.c:740)
[    2.285573]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    2.285597]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    2.285628] RIP: 0033:0x7fa2255fb08e
[    2.285651] 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
[    2.285748] RSP: 002b:00007ffef85957b0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[    2.285791] RAX: ffffffffffffffda RBX: 00007fa22577d580 RCX: 00007fa2255fb08e
[    2.285832] RDX: 0000000000000004 RSI: 00005647335e2f70 RDI: 0000000000000001
[    2.285878] RBP: 00007ffef85957c0 R08: 0000000000000000 R09: 0000000000000000
[    2.285918] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004
[    2.285958] R13: 0000000000000004 R14: 00005647335e2f70 R15: 0000000000000000
| [    2.360047] ------------[ cut here ]------------
| [    2.360108] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: ethtool-fec.sh/158
| [    2.360178] Modules linked in: netdevsim
| [    2.360272] Tainted: [W]=WARN
[    2.360296] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.360335] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    2.360360] Code: 80 00 00 00 e8 09 d9 ff ff 48 83 c4 38 85 c0 75 18 48 83 c4 08 4c 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 44 8b 48 08 eb b4 90 <0f> 0b 90 ba 02 00 00 00 4c 89 fe 31 ff e8 56 a6 fb ff b9 a6 ff ff
All code
========
   0:	80 00 00             	addb   $0x0,(%rax)
   3:	00 e8                	add    %ch,%al
   5:	09 d9                	or     %ebx,%ecx
   7:	ff                   	(bad)
   8:	ff 48 83             	decl   -0x7d(%rax)
   b:	c4                   	(bad)
   c:	38 85 c0 75 18 48    	cmp    %al,0x481875c0(%rbp)
  12:	83 c4 08             	add    $0x8,%esp
  15:	4c 89 f8             	mov    %r15,%rax
  18:	5b                   	pop    %rbx
  19:	5d                   	pop    %rbp
  1a:	41 5c                	pop    %r12
  1c:	41 5d                	pop    %r13
  1e:	41 5e                	pop    %r14
  20:	41 5f                	pop    %r15
  22:	c3                   	ret
  23:	44 8b 48 08          	mov    0x8(%rax),%r9d
  27:	eb b4                	jmp    0xffffffffffffffdd
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	4c 89 fe             	mov    %r15,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 56 a6 fb ff       	call   0xfffffffffffba692
  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:	4c 89 fe             	mov    %r15,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 56 a6 fb ff       	call   0xfffffffffffba668
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    2.360467] RSP: 0018:ff742bbf003a7b88 EFLAGS: 00010286
[    2.360498] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[    2.360543] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1d56b781da4d00
[    2.360589] RBP: 0000000000000000 R08: ff1d56b78311f250 R09: ff1d56b78124f830
[    2.360628] R10: ff1d56b78198a118 R11: fefefefefefefeff R12: 0000000000000000
[    2.360669] R13: 0000000000000011 R14: ff1d56b78198a000 R15: ff1d56b781da4d00
[    2.360712] FS:  00007fa225589b80(0000) GS:ff1d56b8107da000(0000) knlGS:0000000000000000
[    2.360756] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.360791] CR2: 00007ffef8594ff8 CR3: 000000000306e002 CR4: 0000000000771ef0
[    2.360836] PKRU: 55555554
[    2.360852] Call Trace:
[    2.360869]  <TASK>
[    2.360887]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[    2.360921]  unregister_netdevice_queue (net/core/dev.c:12497 net/core/dev.c:12309)
[    2.360951] nsim_destroy (./include/linux/netdevice.h:3455 drivers/net/netdevsim/netdev.c:1193) netdevsim
[    2.360984] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:1547) netdevsim
[    2.361016] nsim_dev_reload_destroy (drivers/net/netdevsim/dev.c:1561 drivers/net/netdevsim/dev.c:1785) netdevsim
[    2.361045] nsim_drv_remove (drivers/net/netdevsim/dev.c:1800) netdevsim
[    2.361076]  device_release_driver_internal (drivers/base/dd.c:1352 drivers/base/dd.c:1375)
[    2.361109]  bus_remove_device (drivers/base/bus.c:657)
[    2.361135]  ? device_remove_attrs (drivers/base/core.c:2844 drivers/base/core.c:2977)
[    2.361165]  device_del (drivers/base/core.c:3895)
[    2.361186]  device_unregister (drivers/base/core.c:3936)
[    2.361208] del_device_store (drivers/net/netdevsim/bus.c:491 drivers/net/netdevsim/bus.c:244) netdevsim
[    2.361243]  kernfs_fop_write_iter (fs/kernfs/file.c:352)
[    2.361278]  vfs_write (fs/read_write.c:595 fs/read_write.c:688)
[    2.361300]  ksys_write (fs/read_write.c:740)
[    2.361321]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    2.361347]  ? __sysvec_call_function_single (arch/x86/kernel/smp.c:272)
[    2.361380]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    2.361416] RIP: 0033:0x7fa2255fb08e
[    2.361435] 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
[    2.361532] RSP: 002b:00007ffef8595b10 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[    2.361574] RAX: ffffffffffffffda RBX: 00007fa22577d580 RCX: 00007fa2255fb08e
[    2.361615] RDX: 0000000000000004 RSI: 00005647335ea780 RDI: 0000000000000001
[    2.361659] RBP: 00007ffef8595b20 R08: 0000000000000000 R09: 0000000000000000
[    2.361700] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004


Finger prints:
rtmsg_ifinfo_build_skb:unregister_netdevice_many_notify:unregister_netdevice_queue:nsim_destroy:__nsim_dev_port_del
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:register_netdevice:nsim_create:__nsim_dev_port_add