======================================
| [ 43.354538][ C1] asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623) 
| [   43.354690][    C1]
| [   43.354767][    C1]
| [   43.354767][    C1] stack backtrace:
[   43.355192][    C1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   43.355580][    C1] Call Trace:
[   43.355771][    C1]  <IRQ>
[ 43.355856][ C1] dump_stack_lvl (lib/dump_stack.c:117) 
[ 43.356098][ C1] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 43.356290][ C1] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 43.356482][ C1] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 43.356760][ C1] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 43.356924][ C1] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 43.357081][ C1] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 43.357237][ C1] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 43.357396][ C1] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 43.357632][ C1] ? add_chain_cache (kernel/locking/lockdep.c:3730) 
[ 43.357787][ C1] ? save_trace (kernel/locking/lockdep.c:586) 
[ 43.357943][ C1] mark_lock (kernel/locking/lockdep.c:4678) 
[ 43.358061][ C1] mark_usage (kernel/locking/lockdep.c:4567) 
[ 43.358262][ C1] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 43.358416][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 43.358571][ C1] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 43.358843][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 43.359082][ C1] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 43.359309][ C1] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 43.359464][ C1] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 43.359616][ C1] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 43.359944][ C1] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 43.360096][ C1] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 43.360331][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 43.360486][ C1] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 43.360725][ C1] br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 43.360951][ C1] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 43.361214][ C1] call_timer_fn (kernel/time/timer.c:1793) 
[ 43.361451][ C1] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 43.361604][ C1] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 43.361765][ C1] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 43.361914][ C1] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 43.362154][ C1] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 43.362312][ C1] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 43.362466][ C1] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 43.362735][ C1] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 43.362973][ C1] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:115 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) 
[ 43.363129][ C1] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 43.363287][ C1] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 43.363442][ C1] ? run_timer_softirq (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 43.363687][ C1] run_timer_softirq (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 43.363845][ C1] __do_softirq (kernel/softirq.c:554) 
[ 43.364001][ C1] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 43.364119][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   43.364273][    C1]  </IRQ>
[   43.364441][    C1]  <TASK>
[ 43.364522][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 43.364712][ C1] RIP: 0010:_raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 43.364913][ C1] Code: 10 e8 21 49 9b fd 48 89 ef e8 59 b9 9b fd 81 e3 00 02 00 00 75 1d 9c 58 f6 c4 02 75 29 48 85 db 74 01 fb 65 ff 0d 05 bf 6f 44 <74> 0e 5b 5d c3 cc cc cc cc e8 4f b3 be fd eb dc 0f 1f 44 00 00 5b
All code
========
   0:	10 e8                	adc    %ch,%al
   2:	21 49 9b             	and    %ecx,-0x65(%rcx)
   5:	fd                   	std
   6:	48 89 ef             	mov    %rbp,%rdi
   9:	e8 59 b9 9b fd       	call   0xfffffffffd9bb967
   e:	81 e3 00 02 00 00    	and    $0x200,%ebx
  14:	75 1d                	jne    0x33
  16:	9c                   	pushf
  17:	58                   	pop    %rax
  18:	f6 c4 02             	test   $0x2,%ah
  1b:	75 29                	jne    0x46
  1d:	48 85 db             	test   %rbx,%rbx
  20:	74 01                	je     0x23
  22:	fb                   	sti
  23:	65 ff 0d 05 bf 6f 44 	decl   %gs:0x446fbf05(%rip)        # 0x446fbf2f
  2a:*	74 0e                	je     0x3a		<-- trapping instruction
  2c:	5b                   	pop    %rbx
  2d:	5d                   	pop    %rbp
  2e:	c3                   	ret
  2f:	cc                   	int3
  30:	cc                   	int3
  31:	cc                   	int3
  32:	cc                   	int3
  33:	e8 4f b3 be fd       	call   0xfffffffffdbeb387
  38:	eb dc                	jmp    0x16
  3a:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  3f:	5b                   	pop    %rbx

Code starting with the faulting instruction
===========================================
   0:	74 0e                	je     0x10
   2:	5b                   	pop    %rbx
   3:	5d                   	pop    %rbp
   4:	c3                   	ret
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	cc                   	int3
   9:	e8 4f b3 be fd       	call   0xfffffffffdbeb35d
   e:	eb dc                	jmp    0xffffffffffffffec
  10:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  15:	5b                   	pop    %rbx
[   43.365562][    C1] RSP: 0000:ffffc9000052fb30 EFLAGS: 00000286
[   43.365761][    C1] RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff7d65eb4
[   43.366082][    C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffbb940911
[   43.366317][    C1] RBP: ffffffffbcd2a240 R08: 0000000000000001 R09: fffffbfff7d638aa
[   43.366550][    C1] R10: ffffffffbeb1c557 R11: ffffc9000052f921 R12: ffff888004539608
[   43.366867][    C1] R13: 0000000000000050 R14: 0000000000000001 R15: 0000000000000282
[ 43.367100][ C1] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 43.367291][ C1] __create_object (mm/kmemleak.c:756) 
[ 43.367541][ C1] kmem_cache_alloc (./include/linux/kmemleak.h:42 mm/slub.c:3802 mm/slub.c:3845 mm/slub.c:3852) 
[ 43.367700][ C1] __anon_vma_prepare (mm/rmap.c:142 mm/rmap.c:196) 
[ 43.367855][ C1] wp_page_copy (mm/memory.c:3219 mm/memory.c:3258) 
[ 43.368011][ C1] ? __pfx_wp_page_copy (mm/memory.c:3242) 
[ 43.368248][ C1] ? __pfx_vm_normal_page (mm/memory.c:584) 
[ 43.368403][ C1] ? rcu_read_unlock (./include/linux/rcupdate.h:339 (discriminator 9) ./include/linux/rcupdate.h:814 (discriminator 9)) 
[ 43.368570][ C1] ? do_wp_page (mm/memory.c:3660) 
[ 43.368733][ C1] __handle_mm_fault (mm/memory.c:5441) 
[ 43.368972][ C1] ? __pfx___handle_mm_fault (mm/memory.c:5352) 
[ 43.369140][ C1] handle_mm_fault (mm/memory.c:5610) 
[ 43.369292][ C1] ? __pfx_find_vma (mm/mmap.c:1889) 
[ 43.369450][ C1] ? __pfx_handle_mm_fault (mm/memory.c:5576) 
[ 43.369607][ C1] do_user_addr_fault (arch/x86/mm/fault.c:1415) 
[ 43.369845][ C1] ? irqentry_enter_from_user_mode (./include/linux/entry-common.h:117 kernel/entry/common.c:225) 
[ 43.370035][ C1] exc_page_fault (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:67 ./arch/x86/include/asm/irqflags.h:127 arch/x86/mm/fault.c:1513 arch/x86/mm/fault.c:1563) 
[ 43.370192][ C1] asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623) 
[   43.370344][    C1] RIP: 0033:0x7f0def56a0ec
[ 43.370597][ C1] Code: 1e fa 80 3d 35 ef 02 00 00 75 2b 55 48 83 3d 0a ef 02 00 00 48 89 e5 74 0c 48 8d 3d fe e8 02 00 e8 59 ff ff ff e8 64 ff ff ff <c6> 05 0d ef 02 00 01 5d c3 0f 1f 00 c3 0f 1f 80 00 00 00 00 f3 0f
All code
========
   0:	1e                   	(bad)
   1:	fa                   	cli
   2:	80 3d 35 ef 02 00 00 	cmpb   $0x0,0x2ef35(%rip)        # 0x2ef3e
   9:	75 2b                	jne    0x36
   b:	55                   	push   %rbp
   c:	48 83 3d 0a ef 02 00 	cmpq   $0x0,0x2ef0a(%rip)        # 0x2ef1e
  13:	00 
  14:	48 89 e5             	mov    %rsp,%rbp
  17:	74 0c                	je     0x25
  19:	48 8d 3d fe e8 02 00 	lea    0x2e8fe(%rip),%rdi        # 0x2e91e
  20:	e8 59 ff ff ff       	call   0xffffffffffffff7e
  25:	e8 64 ff ff ff       	call   0xffffffffffffff8e
  2a:*	c6 05 0d ef 02 00 01 	movb   $0x1,0x2ef0d(%rip)        # 0x2ef3e		<-- trapping instruction
  31:	5d                   	pop    %rbp
  32:	c3                   	ret
  33:	0f 1f 00             	nopl   (%rax)
  36:	c3                   	ret
  37:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  3e:	f3                   	repz
  3f:	0f                   	.byte 0xf

Code starting with the faulting instruction
===========================================
   0:	c6 05 0d ef 02 00 01 	movb   $0x1,0x2ef0d(%rip)        # 0x2ef14
   7:	5d                   	pop    %rbp
   8:	c3                   	ret
   9:	0f 1f 00             	nopl   (%rax)
   c:	c3                   	ret
   d:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  14:	f3                   	repz
  15:	0f                   	.byte 0xf
[   43.371228][    C1] RSP: 002b:00007ffda950a2b0 EFLAGS: 00010246
[   43.371424][    C1] RAX: 00007f0def599000 RBX: 00007f0def94b000 RCX: 0000000000000000
[   43.371656][    C1] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 00007f0def599000
[   43.371980][    C1] RBP: 00007ffda950a2b0 R08: 0000000000000000 R09: 0000000000000068
[   43.372211][    C1] R10: 00007f0def5a7fa8 R11: 00007f0def5f98d0 R12: 0000000000000000


Finger prints:
asm_exc_page_fault:dump_stack_lvl:mark_lock_irq:mark_lock