======================================
| [   18.231157][  T228] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).
| [   19.627266][  T228] ------------[ cut here ]------------
| [   19.627853][  T228] kernel BUG at net/core/net-sysfs.c:2246!
| [   19.628322][  T228] Oops: invalid opcode: 0000 [#1] SMP KASAN
[   19.628991][  T228] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   19.629250][  T228] RIP: 0010:netdev_release (net/core/net-sysfs.c:2246 net/core/net-sysfs.c:2242)
[   19.629511][  T228] Code: 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 20 48 8b bb e0 fa ff ff e8 8c f4 d7 fe 48 89 ef 5b 5d e9 52 01 d8 fe 90 <0f> 0b e8 fa d7 de fe eb bc e8 53 d8 de fe eb d9 90 f3 0f 1e fa 0f
All code
========
   0:	00 00                	add    %al,(%rax)
   2:	00 fc                	add    %bh,%ah
   4:	ff                   	lcall  (bad)
   5:	df 48 89             	fisttps -0x77(%rax)
   8:	fa                   	cli
   9:	48 c1 ea 03          	shr    $0x3,%rdx
   d:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
  11:	75 20                	jne    0x33
  13:	48 8b bb e0 fa ff ff 	mov    -0x520(%rbx),%rdi
  1a:	e8 8c f4 d7 fe       	call   0xfffffffffed7f4ab
  1f:	48 89 ef             	mov    %rbp,%rdi
  22:	5b                   	pop    %rbx
  23:	5d                   	pop    %rbp
  24:	e9 52 01 d8 fe       	jmp    0xfffffffffed8017b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	e8 fa d7 de fe       	call   0xfffffffffeded82b
  31:	eb bc                	jmp    0xffffffffffffffef
  33:	e8 53 d8 de fe       	call   0xfffffffffeded88b
  38:	eb d9                	jmp    0x13
  3a:	90                   	nop
  3b:	f3 0f 1e fa          	endbr64
  3f:	0f                   	.byte 0xf

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	e8 fa d7 de fe       	call   0xfffffffffeded801
   7:	eb bc                	jmp    0xffffffffffffffc5
   9:	e8 53 d8 de fe       	call   0xfffffffffeded861
   e:	eb d9                	jmp    0xffffffffffffffe9
  10:	90                   	nop
  11:	f3 0f 1e fa          	endbr64
  15:	0f                   	.byte 0xf
[   19.630268][  T228] RSP: 0018:ffffc90000a878a8 EFLAGS: 00010297
[   19.630559][  T228] RAX: 0000000000000000 RBX: ffff88800bea2650 RCX: ffffffffb7702b51
[   19.630871][  T228] RDX: 1ffff110017d44c6 RSI: ffffffffb7a5d540 RDI: ffff88800bea2630
[   19.631193][  T228] RBP: ffff88800bea2000 R08: 0000000000000001 R09: ffffed10017d44d1
[   19.631521][  T228] R10: ffff88800bea268b R11: ffffc90000a875c8 R12: ffff888004d55c00
[   19.631835][  T228] R13: 0000000000000000 R14: dead000000000122 R15: dead000000000100
[   19.632148][  T228] FS:  00007f66984be000(0000) GS:ffff88807c9fc000(0000) knlGS:0000000000000000
[   19.632554][  T228] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   19.632816][  T228] CR2: 000055fd408cd650 CR3: 0000000005841003 CR4: 0000000000772ef0
[   19.633145][  T228] PKRU: 55555554
[   19.633314][  T228] Call Trace:
[   19.633485][  T228]  <TASK>
[   19.633597][  T228]  device_release (drivers/base/core.c:2570)
[   19.633823][  T228]  kobject_cleanup (lib/kobject.c:693)
[   19.634044][  T228]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   19.634246][  T228]  ? kasan_quarantine_put (mm/kasan/quarantine.c:234 (discriminator 1))
[   19.634501][  T228]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   19.634727][  T228]  ? generic_xdp_install (net/core/dev.c:11630)
[   19.634956][  T228]  ? kfree (mm/slub.c:6630 mm/slub.c:6837)
[   19.635131][  T228] nsim_destroy (drivers/net/netdevsim/netdev.c:1186) netdevsim
[   19.635350][  T228] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:441 drivers/net/netdevsim/dev.c:1474) netdevsim
[   19.635637][  T228] nsim_dev_reload_destroy (drivers/net/netdevsim/dev.c:1483 drivers/net/netdevsim/dev.c:1707) netdevsim
[   19.635916][  T228] nsim_drv_remove (drivers/net/netdevsim/dev.c:1724) netdevsim
[   19.636167][  T228]  device_release_driver_internal (drivers/base/dd.c:1276 drivers/base/dd.c:1297)
[   19.636494][  T228]  bus_remove_device (./include/linux/kobject.h:193 drivers/base/base.h:73 drivers/base/bus.c:586)
[   19.636718][  T228]  device_del (drivers/base/core.c:3879)
[   19.636900][  T228]  ? __device_link_del (drivers/base/core.c:3833)
[   19.637138][  T228]  device_unregister (drivers/base/core.c:3796 drivers/base/core.c:3920)
[   19.637344][  T228] del_device_store (drivers/net/netdevsim/bus.c:248) netdevsim
[   19.637632][  T228]  ? nsim_bus_dev_numvfs_show (drivers/net/netdevsim/bus.c:215) netdevsim
[   19.637918][  T228]  ? sysfs_file_kobj (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/linux/rcupdate.h:1195 fs/sysfs/file.c:24)
[   19.638144][  T228]  ? sysfs_file_kobj (fs/sysfs/file.c:26)
[   19.638344][  T228]  ? sysfs_file_ops (fs/sysfs/file.c:135)
[   19.638570][  T228]  kernfs_fop_write_iter (fs/kernfs/file.c:88 fs/kernfs/file.c:356)
[   19.638783][  T228]  vfs_write (fs/read_write.c:594 fs/read_write.c:686)
[   19.638953][  T228]  ? kernel_write (fs/read_write.c:667)
[   19.639164][  T228]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.639396][  T228]  ksys_write (fs/read_write.c:738)
[   19.639569][  T228]  ? __ia32_sys_read (fs/read_write.c:728)
[   19.639802][  T228]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   19.640029][  T228]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   19.640289][  T228] RIP: 0033:0x7f66985be257
[   19.640562][  T228] 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
[   19.641338][  T228] RSP: 002b:00007ffe4380c578 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   19.641680][  T228] RAX: ffffffffffffffda RBX: 00007f66986ba780 RCX: 00007f66985be257
[   19.642042][  T228] RDX: 0000000000000004 RSI: 000055fd408cd650 RDI: 0000000000000001
[   19.642353][  T228] RBP: 0000000000000004 R08: 0000000000000000 R09: 00007f6698670d20
[   19.642710][  T228] R10: 00007f6698670c20 R11: 0000000000000246 R12: 0000000000000004


Finger prints:
netdev_release:device_release:kobject_cleanup:netdev_run_todo:nsim_destroy