======================================
| [    6.261688] #PF: supervisor write access in kernel mode
| [    6.261737] #PF: error_code(0x0002) - not-present page
| [    6.261794] PGD 20cd067 P4D 20cd067 PUD 442f067 PMD 0
| [    6.261852] Oops: Oops: 0002 [#1] SMP
[    6.261978] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    6.262041] 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)
[    6.262100] 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
[    6.262279] RSP: 0018:ffff9d04c03ab610 EFLAGS: 00010046
[    6.262328] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000c00
[    6.262403] RDX: ffff9d04c03ab648 RSI: 0000000000000000 RDI: 0000000000000000
[    6.262481] RBP: ffff9d04c03ab648 R08: ffff8c6a0139b673 R09: 0000000000000002
[    6.262560] R10: ffff8c6a3ec28840 R11: ffff8c6a0139ae90 R12: 0000000000000000
[    6.262638] R13: ffff9d04c03ab740 R14: 0000000000000020 R15: 00000000ffffffff
[    6.262718] FS:  00007f4f802df800(0000) GS:ffff8c6a82b91000(0000) knlGS:0000000000000000
[    6.262801] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    6.262865] CR2: 0000000000000000 CR3: 00000000020b9006 CR4: 0000000000772ef0
[    6.262943] PKRU: 55555554
[    6.262969] Call Trace:
[    6.262994]  <TASK>
[    6.263020]  __cancel_work (kernel/workqueue.c:4366)
[    6.263063]  ? queue_delayed_work_on (kernel/workqueue.c:2562)
[    6.263115]  __cancel_work_sync (kernel/workqueue.c:4381)
[    6.263155]  __dev_close_many (net/core/dev.c:1879 (discriminator 2) net/core/dev.c:1932 (discriminator 2))
[    6.263203]  netif_close_many (net/core/dev.c:1959)
[    6.263241]  unregister_netdevice_many_notify (net/core/dev.c:12545)
[    6.263294]  ? unregister_netdevice_queue (net/core/dev.c:12442)
[    6.263346]  rtnl_dellink (net/core/rtnetlink.c:157 ./include/linux/rtnetlink.h:135 net/core/rtnetlink.c:3578)
[    6.263392]  ? virtio_fs_enqueue_req (fs/fuse/virtio_fs.c:1473)
[    6.263447]  ? netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11853)
[    6.263484]  ? rtnl_bridge_getlink (net/core/rtnetlink.c:3536)
[    6.263534]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6959)
[    6.263573]  ? get_page_from_freelist (mm/page_alloc.c:1226 mm/page_alloc.c:1848 mm/page_alloc.c:1858 mm/page_alloc.c:3884)
[    6.263627]  ? rtnl_calcit.isra.0 (net/core/rtnetlink.c:6861)
[    6.263680]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[    6.263720]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[    6.263758]  ? __alloc_skb (net/core/skbuff.c:706)
[    6.263797]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[    6.263836]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[    6.263873]  ? copy_msghdr_from_user (net/socket.c:2570)
[    6.263925]  ___sys_sendmsg (net/socket.c:2686)
[    6.263965]  ? do_wp_page (./include/linux/mmu_notifier.h:468 mm/memory.c:3787 mm/memory.c:4141)
[    6.264005]  ? ___pte_offset_map (./include/linux/pgtable.h:347 ./include/linux/pgtable.h:635 mm/pgtable-generic.c:288)
[    6.264045]  ? nfulnl_rcv_nl_event (net/netfilter/nfnetlink_log.c:836)
[    6.264097]  ? fsnotify_grab_connector (fs/notify/mark.c:709)
[    6.264149]  ? fsnotify_destroy_marks (fs/notify/mark.c:937)
[    6.264201]  __sys_sendmsg (net/socket.c:2716)
[    6.264239]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    6.264283]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[    6.264335] RIP: 0033:0x7f4f804ad1d7
[    6.264371] Code: 0e 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
All code
========
   0:	0e                   	(bad)
   1:	00 f7                	add    %dh,%bh
   3:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b9                	jmp    0xffffffffffffffc9
  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 2e 00 00 00       	mov    $0x2e,%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:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  3b:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)

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:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  11:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
[    6.264546] RSP: 002b:00007fffa9e02b48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[    6.264624] RAX: ffffffffffffffda RBX: 00007fffa9e03270 RCX: 00007f4f804ad1d7
[    6.264702] RDX: 0000000000000000 RSI: 00007fffa9e02bb0 RDI: 0000000000000005
[    6.264778] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[    6.264855] R10: 00007f4f803a9f60 R11: 0000000000000246 R12: 0000000000000001


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