======================================
| [ 1106.917143] #PF: supervisor read access in kernel mode
| [ 1106.917179] #PF: error_code(0x0000) - not-present page
| [ 1106.917216] PGD 0 P4D 0
| [ 1106.917245] Oops: 0000 [#1] PREEMPT SMP NOPTI
[ 1106.917339] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1106.917413] RIP: 0010:sock_wfree (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 net/core/sock.c:3399 net/core/sock.c:2470) 
[ 1106.917458] Code: 6b 45 6b ff 84 db 0f 84 b6 fe ff ff e9 10 ff ff ff be 03 00 00 00 4c 89 e7 e8 41 8a a6 ff e9 61 ff ff ff 48 8b 85 20 01 00 00 <48> 8b 50 08 83 e2 04 74 cc f0 80 60 08 fb eb 99 48 8b bd 00 01 00
All code
========
   0:	6b 45 6b ff          	imul   $0xffffffff,0x6b(%rbp),%eax
   4:	84 db                	test   %bl,%bl
   6:	0f 84 b6 fe ff ff    	je     0xfffffffffffffec2
   c:	e9 10 ff ff ff       	jmp    0xffffffffffffff21
  11:	be 03 00 00 00       	mov    $0x3,%esi
  16:	4c 89 e7             	mov    %r12,%rdi
  19:	e8 41 8a a6 ff       	call   0xffffffffffa68a5f
  1e:	e9 61 ff ff ff       	jmp    0xffffffffffffff84
  23:	48 8b 85 20 01 00 00 	mov    0x120(%rbp),%rax
  2a:*	48 8b 50 08          	mov    0x8(%rax),%rdx		<-- trapping instruction
  2e:	83 e2 04             	and    $0x4,%edx
  31:	74 cc                	je     0xffffffffffffffff
  33:	f0 80 60 08 fb       	lock andb $0xfb,0x8(%rax)
  38:	eb 99                	jmp    0xffffffffffffffd3
  3a:	48                   	rex.W
  3b:	8b                   	.byte 0x8b
  3c:	bd                   	.byte 0xbd
  3d:	00 01                	add    %al,(%rcx)
	...

Code starting with the faulting instruction
===========================================
   0:	48 8b 50 08          	mov    0x8(%rax),%rdx
   4:	83 e2 04             	and    $0x4,%edx
   7:	74 cc                	je     0xffffffffffffffd5
   9:	f0 80 60 08 fb       	lock andb $0xfb,0x8(%rax)
   e:	eb 99                	jmp    0xffffffffffffffa9
  10:	48                   	rex.W
  11:	8b                   	.byte 0x8b
  12:	bd                   	.byte 0xbd
  13:	00 01                	add    %al,(%rcx)
	...
[ 1106.917567] RSP: 0018:ffffbeb54011ce30 EFLAGS: 00010206
[ 1106.917603] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000003dc0
[ 1106.917654] RDX: 0000000000001d40 RSI: ffff9a64471a8000 RDI: 0000000000000000
[ 1106.917704] RBP: ffff9a64419639c0 R08: ffff9a64421788ac R09: 0000000000000001
[ 1106.917755] R10: ffffffff836060c0 R11: ffffbeb54011cff8 R12: ffff9a6441963b3c
[ 1106.917806] R13: 000000000000004b R14: 0000000000000000 R15: ffff9a64471a8000
[ 1106.917858] FS:  0000000000000000(0000) GS:ffff9a647ed00000(0000) knlGS:0000000000000000
[ 1106.917908] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1106.917953] CR2: 0000000000000008 CR3: 000000000b444005 CR4: 0000000000770ef0
[ 1106.918014] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1106.918064] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1106.918114] PKRU: 55555554
[ 1106.918129] Call Trace:
[ 1106.918151]  <IRQ>
[ 1106.918177] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434) 
[ 1106.918216] ? page_fault_oops (arch/x86/mm/fault.c:713) 
[ 1106.918251] ? find_busiest_group (kernel/sched/fair.c:10845) 
[ 1106.918287] ? exc_page_fault (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:72 arch/x86/mm/fault.c:1513 arch/x86/mm/fault.c:1563) 
[ 1106.918322] ? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623) 
[ 1106.918354] ? sock_wfree (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 net/core/sock.c:3399 net/core/sock.c:2470) 
[ 1106.918381] skb_release_head_state (net/core/skbuff.c:1162) 
[ 1106.918418] consume_skb (net/core/skbuff.c:1174 net/core/skbuff.c:1189 net/core/skbuff.c:1411 net/core/skbuff.c:1405) 
[ 1106.918449] dummy_xmit (drivers/net/dummy.c:66) 
[ 1106.918480] dev_hard_start_xmit (./include/linux/netdevice.h:4877 ./include/linux/netdevice.h:4891 net/core/dev.c:3564 net/core/dev.c:3580) 
[ 1106.918515] sch_direct_xmit (net/sched/sch_generic.c:343) 
[ 1106.918551] __qdisc_run (net/sched/sch_generic.c:416) 
[ 1106.918581] ? __hrtimer_run_queues (kernel/time/hrtimer.c:1707 kernel/time/hrtimer.c:1756) 
[ 1106.918617] net_tx_action (./include/net/sch_generic.h:217 ./include/net/pkt_sched.h:128 ./include/net/pkt_sched.h:124 net/core/dev.c:5267) 
[ 1106.918645] __do_softirq (kernel/softirq.c:554) 
[ 1106.918683] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 1106.918715] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[ 1106.918757]  </IRQ>
[ 1106.918775]  <TASK>
[ 1106.918790] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 1106.918830] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:72 arch/x86/kernel/process.c:743) 
[ 1106.918861] Code: 4c 01 c7 4c 29 c2 e9 72 ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d d3 fb 24 00 fb f4 <fa> c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
All code
========
   0:	4c 01 c7             	add    %r8,%rdi
   3:	4c 29 c2             	sub    %r8,%rdx
   6:	e9 72 ff ff ff       	jmp    0xffffffffffffff7d
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d d3 fb 24 00 	verw   0x24fbd3(%rip)        # 0x24fbfb
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	fa                   	cli		<-- trapping instruction
  2b:	c3                   	ret
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	cc                   	int3
  30:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
  37:	00 00 00 00 
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	fa                   	cli
   1:	c3                   	ret
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	cc                   	int3
   6:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
   d:	00 00 00 00 
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[ 1106.918997] RSP: 0018:ffffbeb5400b3ee8 EFLAGS: 00000256
[ 1106.919032] RAX: ffff9a647ed00000 RBX: ffff9a6441378000 RCX: 0000000000000000
[ 1106.919084] RDX: 4000000000000000 RSI: ffffffff832a1591 RDI: 0000000008ee7fcc
[ 1106.919135] RBP: 0000000000000002 R08: 0000000008ee7fcc R09: 0000000000000001
[ 1106.919190] R10: 0000000000000001 R11: 0000000000000002 R12: 0000000000000000
[ 1106.919235] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 1106.919287] default_idle_call (./include/linux/cpuidle.h:144 kernel/sched/idle.c:118) 
[ 1106.919314] do_idle (kernel/sched/idle.c:192 kernel/sched/idle.c:332) 
[ 1106.919345] cpu_startup_entry (kernel/sched/idle.c:429 (discriminator 1)) 
[ 1106.919371] start_secondary (arch/x86/kernel/smpboot.c:313) 


Finger prints:
sock_wfree:skb_release_head_state:consume_skb:dummy_xmit