======================================
| [    2.954296] #PF: supervisor write access in kernel mode
| [    2.954350] #PF: error_code(0x0002) - not-present page
| [    2.954399] PGD 90c9067 P4D 90c9067 PUD 90b3067 PMD 0
| [    2.954456] Oops: Oops: 0002 [#1] SMP
[    2.954613] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.954679] 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)
[    2.954768] 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
[    2.954951] RSP: 0018:ffffb59bc033b770 EFLAGS: 00010046
[    2.955007] RAX: 0000000000000246 RBX: 0000000000000000 RCX: ffff9a34c3793ea8
[    2.955088] RDX: ffffb59bc033b7a8 RSI: 0000000000000000 RDI: 0000000000000000
[    2.955161] RBP: ffffb59bc033b7a8 R08: 0000000000000001 R09: 0000000000000001
[    2.955245] R10: ffffffff986080d8 R11: ffffb59bc013cff8 R12: 0000000000000000
[    2.955318] R13: 0000000000000000 R14: 0000000000000020 R15: 0000000000000001
[    2.955402] FS:  00007fd27a570800(0000) GS:ffff9a3565f5a000(0000) knlGS:0000000000000000
[    2.955483] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.955550] CR2: 0000000000000000 CR3: 0000000002e07002 CR4: 0000000000772ef0
[    2.955626] PKRU: 55555554
[    2.955664] Call Trace:
[    2.955708]  <TASK>
[    2.955747]  __cancel_work (kernel/workqueue.c:4366)
[    2.955799]  __cancel_work_sync (kernel/workqueue.c:4381)
[    2.955844]  __dev_close_many (net/core/dev.c:1879 (discriminator 2) net/core/dev.c:1932 (discriminator 2))
[    2.955918]  __dev_change_flags (./include/linux/list.h:226 ./include/linux/list.h:237 net/core/dev.c:1945 net/core/dev.c:9924)
[    2.955970]  netif_change_flags (net/core/dev.c:9989)
[    2.956017]  dev_change_flags (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:69)
[    2.956070] cycle_netdev (drivers/net/vrf.c:1052) vrf
[    2.956117] vrf_add_slave (drivers/net/vrf.c:1083 drivers/net/vrf.c:1102) vrf
[    2.956163]  do_set_master (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:41 net/core/rtnetlink.c:2964)
[    2.956225]  rtnl_newlink (net/core/rtnetlink.c:3854 net/core/rtnetlink.c:3957 net/core/rtnetlink.c:4072)
[    2.956276]  ? rtnl_setlink (net/core/rtnetlink.c:3963)
[    2.956327]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6959)
[    2.956370]  ? update_load_avg (kernel/sched/fair.c:4731)
[    2.956420]  ? rtnl_calcit.isra.0 (net/core/rtnetlink.c:6861)
[    2.956477]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[    2.956540]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[    2.956587]  ? __alloc_skb (net/core/skbuff.c:706)
[    2.956640]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[    2.956683]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[    2.956742]  ? copy_msghdr_from_user (net/socket.c:2570)
[    2.956802]  ___sys_sendmsg (net/socket.c:2686)
[    2.956852]  ? __handle_mm_fault (mm/memory.c:5708 mm/memory.c:5850 mm/memory.c:4362 mm/memory.c:6195 mm/memory.c:6336)
[    2.956925]  __sys_sendmsg (net/socket.c:2716)
[    2.956968]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    2.957030]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[    2.957103] RIP: 0033:0x7fd27a73e1d7
[    2.957158] Code: Unable to access opcode bytes at 0x7fd27a73e1ad.

Code starting with the faulting instruction
===========================================
[    2.957225] RSP: 002b:00007ffc0dba7928 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[    2.957307] RAX: ffffffffffffffda RBX: 00007ffc0dba8050 RCX: 00007fd27a73e1d7
[    2.957378] RDX: 0000000000000000 RSI: 00007ffc0dba7990 RDI: 0000000000000005
[    2.957457] RBP: 0000000000000002 R08: 0000000000000054 R09: 0000000000000000
[    2.957531] R10: 00007fd27a7ccac0 R11: 0000000000000246 R12: 00007ffc0dba8098


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