======================================
| [    8.106400] #PF: supervisor write access in kernel mode
| [    8.106435] #PF: error_code(0x0002) - not-present page
| [    8.106471] PGD 0 P4D 0
| [    8.106492] Oops: Oops: 0002 [#1] SMP
[    8.106589] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.106630] RIP: 0010:work_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072 kernel/workqueue.c:2160)
[    8.106673] Code: 83 e6 01 41 57 41 56 4c 8d 77 20 41 55 41 54 41 89 f4 55 48 89 d5 53 48 89 fb 9c 58 fa 48 89 45 00 45 85 e4 0f 85 8a 00 00 00 <f0> 48 0f ba 2b 00 41 0f 92 c5 72 0e 5b 44 89 e8 5d 41 5c 41 5d 41
All code
========
   0:	83 e6 01             	and    $0x1,%esi
   3:	41 57                	push   %r15
   5:	41 56                	push   %r14
   7:	4c 8d 77 20          	lea    0x20(%rdi),%r14
   b:	41 55                	push   %r13
   d:	41 54                	push   %r12
   f:	41 89 f4             	mov    %esi,%r12d
  12:	55                   	push   %rbp
  13:	48 89 d5             	mov    %rdx,%rbp
  16:	53                   	push   %rbx
  17:	48 89 fb             	mov    %rdi,%rbx
  1a:	9c                   	pushf
  1b:	58                   	pop    %rax
  1c:	fa                   	cli
  1d:	48 89 45 00          	mov    %rax,0x0(%rbp)
  21:	45 85 e4             	test   %r12d,%r12d
  24:	0f 85 8a 00 00 00    	jne    0xb4
  2a:*	f0 48 0f ba 2b 00    	lock btsq $0x0,(%rbx)		<-- trapping instruction
  30:	41 0f 92 c5          	setb   %r13b
  34:	72 0e                	jb     0x44
  36:	5b                   	pop    %rbx
  37:	44 89 e8             	mov    %r13d,%eax
  3a:	5d                   	pop    %rbp
  3b:	41 5c                	pop    %r12
  3d:	41 5d                	pop    %r13
  3f:	41                   	rex.B

Code starting with the faulting instruction
===========================================
   0:	f0 48 0f ba 2b 00    	lock btsq $0x0,(%rbx)
   6:	41 0f 92 c5          	setb   %r13b
   a:	72 0e                	jb     0x1a
   c:	5b                   	pop    %rbx
   d:	44 89 e8             	mov    %r13d,%eax
  10:	5d                   	pop    %rbp
  11:	41 5c                	pop    %r12
  13:	41 5d                	pop    %r13
  15:	41                   	rex.B
[    8.106783] RSP: 0018:ffffb6034051fae8 EFLAGS: 00010046
[    8.106818] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000001009c2
[    8.106863] RDX: ffffb6034051fb20 RSI: 0000000000000000 RDI: 0000000000000000
[    8.106915] RBP: ffffb6034051fb20 R08: ffff9f354157b220 R09: 0000000000000001
[    8.106970] R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000000
[    8.107020] R13: ffffb6034051fc18 R14: 0000000000000020 R15: 0000000000000000
[    8.107071] FS:  00007f747cc2c000(0000) GS:ffff9f35e42d9000(0000) knlGS:0000000000000000
[    8.107122] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.107177] CR2: 0000000000000000 CR3: 00000000067c6003 CR4: 0000000000772ef0
[    8.107225] PKRU: 55555554
[    8.107244] Call Trace:
[    8.107261]  <TASK>
[    8.107282]  __cancel_work (kernel/workqueue.c:4366)
[    8.107315]  __cancel_work_sync (kernel/workqueue.c:4381)
[    8.107343]  __dev_close_many (net/core/dev.c:1879 (discriminator 2) net/core/dev.c:1932 (discriminator 2))
[    8.107371]  netif_close_many (net/core/dev.c:1959)
[    8.107398]  unregister_netdevice_many_notify (net/core/dev.c:12476 net/core/dev.c:12537)
[    8.107434]  unregister_netdevice_queue (net/core/dev.c:12452)
[    8.107469] nsim_destroy (drivers/net/netdevsim/netdevsim.h:397 (discriminator 2) drivers/net/netdevsim/netdev.c:1179 (discriminator 2)) netdevsim
[    8.107510] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:443 drivers/net/netdevsim/dev.c:1528) netdevsim
[    8.107545] nsim_dev_reload_destroy (drivers/net/netdevsim/dev.c:1537 drivers/net/netdevsim/dev.c:1762) netdevsim
[    8.107581] nsim_drv_remove (drivers/net/netdevsim/dev.c:1779) netdevsim
[    8.107616]  device_release_driver_internal (drivers/base/dd.c:1276 drivers/base/dd.c:1297)
[    8.107652]  bus_remove_device (./include/linux/kobject.h:193 (discriminator 3) drivers/base/base.h:73 (discriminator 3) drivers/base/bus.c:586 (discriminator 3))
[    8.107679]  device_del (drivers/base/core.c:3879)
[    8.107709]  device_unregister (drivers/base/core.c:3796 drivers/base/core.c:3920)
[    8.107739] del_device_store (drivers/net/netdevsim/bus.c:248) netdevsim
[    8.107827]  kernfs_fop_write_iter (fs/kernfs/file.c:88 fs/kernfs/file.c:356)
[    8.107870]  vfs_write (fs/read_write.c:594 fs/read_write.c:686)
[    8.107903]  ksys_write (fs/read_write.c:738)
[    8.107931]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.107972]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[    8.108009] RIP: 0033:0x7f747cd2c257
[    8.108036] 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
[    8.108145] RSP: 002b:00007ffc0bc819d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[    8.108206] RAX: ffffffffffffffda RBX: 00007f747ce28780 RCX: 00007f747cd2c257
[    8.108251] RDX: 0000000000000004 RSI: 0000557b36490f30 RDI: 0000000000000001
[    8.108296] RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000000
[    8.108346] R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000000004


Finger prints:
work_grab_pending:__cancel_work:__cancel_work_sync:__dev_close_many:netif_close_many