======================================
| [   50.205689] #PF: supervisor write access in kernel mode
| [   50.205736] #PF: error_code(0x0002) - not-present page
| [   50.205790] PGD 7d2d067 P4D 7d2d067 PUD 2f4a067 PMD 0
| [   50.205842] Oops: Oops: 0002 [#1] SMP
[   50.205974] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   50.206034] 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)
[   50.206111] 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
[   50.206274] RSP: 0018:ffffb8be00b5b630 EFLAGS: 00010046
[   50.206330] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000c00
[   50.206393] RDX: ffffb8be00b5b668 RSI: 0000000000000000 RDI: 0000000000000000
[   50.206461] RBP: ffffb8be00b5b668 R08: ffff8cfbc3083673 R09: 0000000000000002
[   50.206539] R10: ffff8cfbfed28640 R11: ffff8cfbc3082e90 R12: 0000000000000000
[   50.206605] R13: 0000000000000000 R14: 0000000000000020 R15: 0000000000000001
[   50.206682] FS:  00007f31d6b0e800(0000) GS:ffff8cfc4c0da000(0000) knlGS:0000000000000000
[   50.206755] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   50.206821] CR2: 0000000000000000 CR3: 0000000004d53005 CR4: 0000000000772ef0
[   50.206889] PKRU: 55555554
[   50.206917] Call Trace:
[   50.206944]  <TASK>
[   50.206977]  __cancel_work (kernel/workqueue.c:4366)
[   50.207028]  ? linkwatch_urgent_event (net/core/link_watch.c:114)
[   50.207089]  __cancel_work_sync (kernel/workqueue.c:4381)
[   50.207130]  __dev_close_many (net/core/dev.c:1879 (discriminator 2) net/core/dev.c:1932 (discriminator 2))
[   50.207178]  __dev_change_flags (./include/linux/list.h:226 ./include/linux/list.h:237 net/core/dev.c:1945 net/core/dev.c:9924)
[   50.207226]  netif_change_flags (net/core/dev.c:9989)
[   50.207267]  dev_change_flags (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:69)
[   50.207309] cycle_netdev (drivers/net/vrf.c:1052) vrf
[   50.207349] vrf_del_slave (drivers/net/vrf.c:1119) vrf
[   50.207389]  do_set_master (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:41 net/core/rtnetlink.c:2948)
[   50.207431]  do_setlink.constprop.0 (net/core/rtnetlink.c:3165)
[   50.207486]  ? __nla_validate_parse (./include/net/netlink.h:1307 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[   50.207539]  ? __kmalloc_cache_noprof (./include/linux/kernel.h:61 ./include/linux/sched/mm.h:321 mm/slub.c:4929 mm/slub.c:5264 mm/slub.c:5766)
[   50.207599]  rtnl_newlink (net/core/rtnetlink.c:3776 net/core/rtnetlink.c:3935 net/core/rtnetlink.c:4072)
[   50.207640]  ? virtio_fs_enqueue_req (fs/fuse/virtio_fs.c:1473)
[   50.207705]  ? netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11853)
[   50.207745]  ? rtnl_setlink (net/core/rtnetlink.c:3963)
[   50.207785]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6959)
[   50.207832]  ? get_page_from_freelist (mm/page_alloc.c:1226 mm/page_alloc.c:1848 mm/page_alloc.c:1858 mm/page_alloc.c:3884)
[   50.207890]  ? rtnl_calcit.isra.0 (net/core/rtnetlink.c:6861)
[   50.207943]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   50.207989]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   50.208029]  ? __alloc_skb (net/core/skbuff.c:706)
[   50.208075]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   50.208117]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   50.208164]  ? copy_msghdr_from_user (net/socket.c:2570)
[   50.208218]  ___sys_sendmsg (net/socket.c:2686)
[   50.208260]  ? do_wp_page (./include/linux/mmu_notifier.h:468 mm/memory.c:3787 mm/memory.c:4141)
[   50.208302]  ? nfulnl_rcv_nl_event (net/netfilter/nfnetlink_log.c:836)
[   50.208353]  ? fsnotify_grab_connector (fs/notify/mark.c:709)
[   50.208410]  ? fsnotify_destroy_marks (fs/notify/mark.c:937)
[   50.208463]  __sys_sendmsg (net/socket.c:2716)
[   50.208511]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   50.208553]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   50.208604] RIP: 0033:0x7f31d6cdc1d7
[   50.208645] 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)
[   50.208811] RSP: 002b:00007ffdfcd571f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   50.208891] RAX: ffffffffffffffda RBX: 00007ffdfcd57920 RCX: 00007f31d6cdc1d7
[   50.208966] RDX: 0000000000000000 RSI: 00007ffdfcd57260 RDI: 0000000000000005
[   50.209038] RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000000
[   50.209105] R10: 0000000021723910 R11: 0000000000000246 R12: 0000000000000004


Finger prints:
work_grab_pending:__cancel_work:__cancel_work_sync:__dev_close_many:__dev_change_flags