======================================
| [  842.250635] #PF: supervisor read access in kernel mode
| [  842.250671] #PF: error_code(0x0000) - not-present page
| [  842.250709] PGD 0 P4D 0
| [  842.250735] Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI
[  842.250824] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  842.250888] Workqueue: events_unbound linkwatch_event
[  842.250925] RIP: 0010:neigh_flush_dev.isra.0 (net/core/neighbour.c:380) 
[ 842.250961] Code: 55 53 48 8b ac c6 70 09 00 00 48 85 ed 0f 84 1f 01 00 00 49 bd 22 01 00 00 00 00 ad de 41 89 d6 48 83 ed 10 0f 84 08 01 00 00 <48> 8b 5d 10 45 84 f6 74 0d 80 bd 9c 00 00 00 00 0f 88 e0 00 00 00
All code
========
   0:	55                   	push   %rbp
   1:	53                   	push   %rbx
   2:	48 8b ac c6 70 09 00 	mov    0x970(%rsi,%rax,8),%rbp
   9:	00 
   a:	48 85 ed             	test   %rbp,%rbp
   d:	0f 84 1f 01 00 00    	je     0x132
  13:	49 bd 22 01 00 00 00 	movabs $0xdead000000000122,%r13
  1a:	00 ad de 
  1d:	41 89 d6             	mov    %edx,%r14d
  20:	48 83 ed 10          	sub    $0x10,%rbp
  24:	0f 84 08 01 00 00    	je     0x132
  2a:*	48 8b 5d 10          	mov    0x10(%rbp),%rbx		<-- trapping instruction
  2e:	45 84 f6             	test   %r14b,%r14b
  31:	74 0d                	je     0x40
  33:	80 bd 9c 00 00 00 00 	cmpb   $0x0,0x9c(%rbp)
  3a:	0f 88 e0 00 00 00    	js     0x120

Code starting with the faulting instruction
===========================================
   0:	48 8b 5d 10          	mov    0x10(%rbp),%rbx
   4:	45 84 f6             	test   %r14b,%r14b
   7:	74 0d                	je     0x16
   9:	80 bd 9c 00 00 00 00 	cmpb   $0x0,0x9c(%rbp)
  10:	0f 88 e0 00 00 00    	js     0xf6
[  842.251055] RSP: 0018:ffffba96c015fd40 EFLAGS: 00010202
[  842.251086] RAX: 0000000000001371 RBX: 00007fffffdff138 RCX: 0000000000001388
[  842.251132] RDX: ffff97707ec9d078 RSI: 0000000000000286 RDI: ffff97707ec9d070
[  842.251176] RBP: 00007fffffdff138 R08: ffff9770426d1e7c R09: ffff97707ec9cf40
[  842.251219] R10: ffff97707ec9cf58 R11: 0000000000000320 R12: ffffffffba427160
[  842.251263] R13: dead000000000122 R14: 0000000000000001 R15: ffff9770418da040
[  842.251309] FS:  0000000000000000(0000) GS:ffff97707ec80000(0000) knlGS:0000000000000000
[  842.251355] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  842.251394] CR2: 00007fffffdff148 CR3: 0000000027c40002 CR4: 0000000000772ef0
[  842.251438] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  842.251480] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  842.251524] PKRU: 55555554
[  842.251542] Call Trace:
[  842.251566]  <TASK>
[  842.251586] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434) 
[  842.251616] ? page_fault_oops (arch/x86/mm/fault.c:715) 
[  842.251645] ? dl_server_stop (kernel/sched/deadline.c:1663) 
[  842.251681] ? exc_page_fault (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:92 arch/x86/mm/fault.c:1489 arch/x86/mm/fault.c:1539) 
[  842.251710] ? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623) 
[  842.251739] ? neigh_flush_dev.isra.0 (net/core/neighbour.c:380) 
[  842.251772] __neigh_ifdown.isra.0 (net/core/neighbour.c:425) 
[  842.251805] neigh_carrier_down (net/core/neighbour.c:438) 
[  842.251832] arp_netdev_event (net/ipv4/arp.c:1343) 
[  842.251863] notifier_call_chain (kernel/notifier.c:93) 
[  842.251893] netdev_state_change (net/core/dev.c:1380 net/core/dev.c:1371) 
[  842.251925] linkwatch_do_dev (net/core/link_watch.c:177) 
[  842.251953] __linkwatch_run_queue (./include/linux/spinlock.h:376 net/core/link_watch.c:236) 
[  842.251985] linkwatch_event (net/core/link_watch.c:278) 
[  842.252009] process_one_work (kernel/workqueue.c:3229) 
[  842.252037] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391) 
[  842.252063] ? __pfx_worker_thread (kernel/workqueue.c:3337) 
[  842.252094] kthread (kernel/kthread.c:389) 
[  842.252118] ? __pfx_kthread (kernel/kthread.c:342) 
[  842.252143] ret_from_fork (arch/x86/kernel/process.c:147) 
[  842.252172] ? __pfx_kthread (kernel/kthread.c:342) 


Finger prints:
neigh_carrier_down:arp_netdev_event:notifier_call_chain:netdev_state_change:linkwatch_do_dev