======================================
| [ 1261.832404] #PF: supervisor read access in kernel mode
| [ 1261.832456] #PF: error_code(0x0000) - not-present page
| [ 1261.832507] PGD 0 P4D 0
| [ 1261.832540] Oops: 0000 [#1] PREEMPT SMP NOPTI
[ 1261.832662] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1261.832762] 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:3397 net/core/sock.c:2470) 
[ 1261.832824] Code: c3 d1 fa 39 ca 77 9c e8 28 48 6b ff e9 09 ff ff ff be 03 00 00 00 4c 89 e7 e8 06 8d a6 ff e9 61 ff ff ff 48 8b 85 20 01 00 00 <48> 8b 40 08 a8 04 75 83 eb ad 48 8b bd 00 01 00 00 ba 02 00 00 00
All code
========
   0:	c3                   	ret
   1:	d1 fa                	sar    %edx
   3:	39 ca                	cmp    %ecx,%edx
   5:	77 9c                	ja     0xffffffffffffffa3
   7:	e8 28 48 6b ff       	call   0xffffffffff6b4834
   c:	e9 09 ff ff ff       	jmp    0xffffffffffffff1a
  11:	be 03 00 00 00       	mov    $0x3,%esi
  16:	4c 89 e7             	mov    %r12,%rdi
  19:	e8 06 8d a6 ff       	call   0xffffffffffa68d24
  1e:	e9 61 ff ff ff       	jmp    0xffffffffffffff84
  23:	48 8b 85 20 01 00 00 	mov    0x120(%rbp),%rax
  2a:*	48 8b 40 08          	mov    0x8(%rax),%rax		<-- trapping instruction
  2e:	a8 04                	test   $0x4,%al
  30:	75 83                	jne    0xffffffffffffffb5
  32:	eb ad                	jmp    0xffffffffffffffe1
  34:	48 8b bd 00 01 00 00 	mov    0x100(%rbp),%rdi
  3b:	ba 02 00 00 00       	mov    $0x2,%edx

Code starting with the faulting instruction
===========================================
   0:	48 8b 40 08          	mov    0x8(%rax),%rax
   4:	a8 04                	test   $0x4,%al
   6:	75 83                	jne    0xffffffffffffff8b
   8:	eb ad                	jmp    0xffffffffffffffb7
   a:	48 8b bd 00 01 00 00 	mov    0x100(%rbp),%rdi
  11:	ba 02 00 00 00       	mov    $0x2,%edx
[ 1261.832983] RSP: 0018:ffffa23080148e30 EFLAGS: 00010206
[ 1261.833039] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000002080
[ 1261.833114] RDX: 0000000000001d40 RSI: ffff95fdc4a0d000 RDI: 0000000000000000
[ 1261.833190] RBP: ffff95fdc247e900 R08: ffff95fdc10678ac R09: 0000000000000001
[ 1261.833254] R10: ffffffffbb8060c0 R11: ffffa23080148ff8 R12: ffff95fdc247ea7c
[ 1261.833328] R13: 000000000000004b R14: 0000000000000000 R15: ffff95fdc4a0d000
[ 1261.833398] FS:  0000000000000000(0000) GS:ffff95fdfed80000(0000) knlGS:0000000000000000
[ 1261.833468] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1261.833525] CR2: 0000000000000008 CR3: 0000000018644006 CR4: 0000000000770ef0
[ 1261.833599] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1261.833652] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1261.833703] PKRU: 55555554
[ 1261.833733] Call Trace:
[ 1261.833772]  <IRQ>
[ 1261.833806] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434) 
[ 1261.833851] ? page_fault_oops (arch/x86/mm/fault.c:713) 
[ 1261.833894] ? find_busiest_group (kernel/sched/fair.c:10845) 
[ 1261.833943] ? 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) 
[ 1261.833986] ? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623) 
[ 1261.834035] ? 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:3397 net/core/sock.c:2470) 
[ 1261.834074] skb_release_head_state (net/core/skbuff.c:1162) 
[ 1261.834119] consume_skb (net/core/skbuff.c:1174 net/core/skbuff.c:1189 net/core/skbuff.c:1405 net/core/skbuff.c:1399) 
[ 1261.834164] dummy_xmit (drivers/net/dummy.c:66) 
[ 1261.834211] dev_hard_start_xmit (./include/linux/netdevice.h:4875 ./include/linux/netdevice.h:4889 net/core/dev.c:3563 net/core/dev.c:3579) 
[ 1261.834259] sch_direct_xmit (net/sched/sch_generic.c:343) 
[ 1261.834303] __qdisc_run (net/sched/sch_generic.c:416) 
[ 1261.834343] ? __hrtimer_run_queues (kernel/time/hrtimer.c:1707 kernel/time/hrtimer.c:1756) 
[ 1261.834390] 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:5266) 
[ 1261.834431] __do_softirq (kernel/softirq.c:554) 
[ 1261.834475] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 1261.834520] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[ 1261.834571]  </IRQ>
[ 1261.834598]  <TASK>
[ 1261.834620] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 1261.834676] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:72 arch/x86/kernel/process.c:743) 
[ 1261.834714] 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 0b 25 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 0b 25 00 	verw   0x250bd3(%rip)        # 0x250bfb
  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
[ 1261.834869] RSP: 0018:ffffa230800bbee8 EFLAGS: 00000246
[ 1261.834918] RAX: ffff95fdfed80000 RBX: ffff95fdc1379700 RCX: 00000125cbd2af40
[ 1261.834987] RDX: 4000000000000000 RSI: ffffffffbb4a0ffe RDI: 00000000031f16c4
[ 1261.835060] RBP: 0000000000000003 R08: 00000000031f16c4 R09: 00000125cbd2af40
[ 1261.835124] R10: 0000000000000001 R11: 0000000000000008 R12: 0000000000000000
[ 1261.835200] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 1261.835274] default_idle_call (./include/linux/cpuidle.h:144 kernel/sched/idle.c:118) 
[ 1261.835316] do_idle (kernel/sched/idle.c:192 kernel/sched/idle.c:332) 
[ 1261.835358] cpu_startup_entry (kernel/sched/idle.c:429 (discriminator 1)) 
[ 1261.835400] start_secondary (arch/x86/kernel/smpboot.c:313) 


Finger prints:
sock_wfree:skb_release_head_state:consume_skb:dummy_xmit