======================================
| [    4.493827] netdevsim netdevsim660 eni660np1: renamed from eth1
| [    4.837584] ------------[ cut here ]------------
| [    4.837662] kernel BUG at net/core/net-sysfs.c:2246!
| [    4.837722] Oops: invalid opcode: 0000 [#1] SMP
[    4.837877] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    4.837934] RIP: 0010:netdev_release (net/core/net-sysfs.c:2246 net/core/net-sysfs.c:2242)
[    4.837993] Code: fa 0f 1f 44 00 00 80 7f d8 04 75 1d 55 48 8d af a8 fa ff ff 48 8b bf e0 fb ff ff e8 ed d7 a4 ff 48 89 ef 5d e9 a4 de a4 ff 90 <0f> 0b 90 f3 0f 1e fa 0f 1f 44 00 00 55 48 89 f5 48 8d 97 c8 fb ff
All code
========
   0:	fa                   	cli
   1:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   6:	80 7f d8 04          	cmpb   $0x4,-0x28(%rdi)
   a:	75 1d                	jne    0x29
   c:	55                   	push   %rbp
   d:	48 8d af a8 fa ff ff 	lea    -0x558(%rdi),%rbp
  14:	48 8b bf e0 fb ff ff 	mov    -0x420(%rdi),%rdi
  1b:	e8 ed d7 a4 ff       	call   0xffffffffffa4d80d
  20:	48 89 ef             	mov    %rbp,%rdi
  23:	5d                   	pop    %rbp
  24:	e9 a4 de a4 ff       	jmp    0xffffffffffa4decd
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	f3 0f 1e fa          	endbr64
  31:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  36:	55                   	push   %rbp
  37:	48 89 f5             	mov    %rsi,%rbp
  3a:	48                   	rex.W
  3b:	8d                   	.byte 0x8d
  3c:	97                   	xchg   %eax,%edi
  3d:	c8                   	.byte 0xc8
  3e:	fb                   	sti
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	f3 0f 1e fa          	endbr64
   7:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   c:	55                   	push   %rbp
   d:	48 89 f5             	mov    %rsi,%rbp
  10:	48                   	rex.W
  11:	8d                   	.byte 0x8d
  12:	97                   	xchg   %eax,%edi
  13:	c8                   	.byte 0xc8
  14:	fb                   	sti
  15:	ff                   	.byte 0xff
[    4.838160] RSP: 0018:ffffa7b40049fbf0 EFLAGS: 00010297
[    4.838205] RAX: ffffffffae951ca0 RBX: 00000000ffffffff RCX: 0000000000000002
[    4.838275] RDX: 0000000000000006 RSI: ffffffffae758ea4 RDI: ffff8efb43d1c558
[    4.838346] RBP: ffff8efb43d1c558 R08: 0000000000000010 R09: 0000000000000110
[    4.838418] R10: 0000000000000184 R11: 0000000000000110 R12: ffff8efb41b16c00
[    4.838487] R13: ffffffffaecb2ea0 R14: ffff8efb4106fb10 R15: ffff8efb43d1c000
[    4.838561] FS:  00007f201f8e2000(0000) GS:ffff8efbcef11000(0000) knlGS:0000000000000000
[    4.838638] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.838704] CR2: 0000563bc0a9f7e0 CR3: 00000000060c7003 CR4: 0000000000772ef0
[    4.838777] PKRU: 55555554
[    4.838799] Call Trace:
[    4.838826]  <TASK>
[    4.838853]  device_release (drivers/base/core.c:2569)
[    4.838898]  kobject_put (lib/kobject.c:693 lib/kobject.c:720 ./include/linux/kref.h:65 lib/kobject.c:737)
[    4.838943]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[    4.838985] nsim_destroy (drivers/net/netdevsim/netdevsim.h:396 drivers/net/netdevsim/netdev.c:1186) netdevsim
[    4.839044] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:441 drivers/net/netdevsim/dev.c:1474) netdevsim
[    4.839099] nsim_dev_reload_destroy (drivers/net/netdevsim/dev.c:1483 drivers/net/netdevsim/dev.c:1707) netdevsim
[    4.839154] nsim_drv_remove (drivers/net/netdevsim/dev.c:1724) netdevsim
[    4.839207]  device_release_driver_internal (drivers/base/dd.c:1276 drivers/base/dd.c:1297)
[    4.839260]  bus_remove_device (./include/linux/kobject.h:193 (discriminator 3) drivers/base/base.h:73 (discriminator 3) drivers/base/bus.c:586 (discriminator 3))
[    4.839295]  device_del (drivers/base/core.c:3879)
[    4.839331]  device_unregister (drivers/base/core.c:3796 drivers/base/core.c:3920)
[    4.839366] del_device_store (drivers/net/netdevsim/bus.c:248) netdevsim
[    4.839422]  kernfs_fop_write_iter (fs/kernfs/file.c:88 fs/kernfs/file.c:356)
[    4.839482]  vfs_write (fs/read_write.c:594 fs/read_write.c:686)
[    4.839532]  ksys_write (fs/read_write.c:738)
[    4.839573]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    4.839618]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[    4.839674] RIP: 0033:0x7f201f9e2257
[    4.839711] Code: 0f 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24
All code
========
   0:	0f 00                	(bad)
   2:	f7 d8                	neg    %eax
   4:	64 89 02             	mov    %eax,%fs:(%rdx)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b7                	jmp    0xffffffffffffffc7
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 01 00 00 00       	mov    $0x1,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	48 89 54 24 18       	mov    %rdx,0x18(%rsp)
  3c:	48                   	rex.W
  3d:	89                   	.byte 0x89
  3e:	74 24                	je     0x64

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	48 89 54 24 18       	mov    %rdx,0x18(%rsp)
  12:	48                   	rex.W
  13:	89                   	.byte 0x89
  14:	74 24                	je     0x3a
[    4.839878] RSP: 002b:00007fff38c0c9e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[    4.839946] RAX: ffffffffffffffda RBX: 00007f201fade780 RCX: 00007f201f9e2257
[    4.840016] RDX: 0000000000000004 RSI: 0000563bc0a9f7e0 RDI: 0000000000000001
[    4.840087] RBP: 0000000000000004 R08: 0000000000000000 R09: 00007f201fa94d20
[    4.840159] R10: 00007f201fa94c20 R11: 0000000000000246 R12: 0000000000000004


Finger prints:
netdev_release:device_release:kobject_put:netdev_run_todo:nsim_destroy