======================================
| [ 27.197697][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   27.197990][    C2]
| [   27.198104][    C2]
| [   27.198104][    C2] stack backtrace:
[   27.198715][    C2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   27.199211][    C2] Call Trace:
[   27.199397][    C2]  <IRQ>
[ 27.199524][ C2] dump_stack_lvl (lib/dump_stack.c:117) 
[ 27.199770][ C2] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 27.200061][ C2] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 27.200345][ C2] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 27.200563][ C2] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 27.200789][ C2] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 27.201013][ C2] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 27.201243][ C2] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 27.201461][ C2] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 27.201683][ C2] ? add_chain_cache (kernel/locking/lockdep.c:3730) 
[ 27.201903][ C2] ? save_trace (kernel/locking/lockdep.c:586) 
[ 27.202120][ C2] mark_lock (kernel/locking/lockdep.c:4678) 
[ 27.202284][ C2] mark_usage (kernel/locking/lockdep.c:4567) 
[ 27.202449][ C2] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 27.202669][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 27.202890][ C2] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) 
[ 27.203156][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 27.203373][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 27.203650][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 27.203865][ C2] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 27.204085][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 27.204365][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 27.204597][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 27.204882][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 27.205098][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 27.205372][ C2] br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 27.205640][ C2] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) 
[ 27.205907][ C2] call_timer_fn (kernel/time/timer.c:1793) 
[ 27.206127][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 27.206347][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 27.206628][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 27.206779][ C2] ? 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) 
[ 27.206925][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 27.207072][ C2] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 27.207214][ C2] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) 
[ 27.207388][ C2] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 27.207532][ C2] ? 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) 
[ 27.207761][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 27.207904][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 27.208045][ C2] ? run_timer_softirq (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 27.208187][ C2] run_timer_softirq (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 27.208410][ C2] __do_softirq (kernel/softirq.c:554) 
[ 27.208563][ C2] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 27.208669][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   27.208811][    C2]  </IRQ>
[   27.208884][    C2]  <TASK>
[ 27.209040][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 27.209216][ C2] RIP: 0010:arch_stack_walk (arch/x86/kernel/stacktrace.c:17) 
[ 27.209363][ C2] Code: e6 83 eb 8d e6 89 eb b3 e6 82 eb 85 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 0f 1f 44 00 00 55 <48> 89 e5 41 56 49 89 d6 41 55 49 89 cd 41 54 49 89 f4 53 48 89 fb
All code
========
   0:	e6 83                	out    %al,$0x83
   2:	eb 8d                	jmp    0xffffffffffffff91
   4:	e6 89                	out    %al,$0x89
   6:	eb b3                	jmp    0xffffffffffffffbb
   8:	e6 82                	out    %al,$0x82
   a:	eb 85                	jmp    0xffffffffffffff91
   c:	0f 1f 40 00          	nopl   0x0(%rax)
  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:	90                   	nop
  1c:	90                   	nop
  1d:	90                   	nop
  1e:	90                   	nop
  1f:	90                   	nop
  20:	66 0f 1f 00          	nopw   (%rax)
  24:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  29:	55                   	push   %rbp
  2a:*	48 89 e5             	mov    %rsp,%rbp		<-- trapping instruction
  2d:	41 56                	push   %r14
  2f:	49 89 d6             	mov    %rdx,%r14
  32:	41 55                	push   %r13
  34:	49 89 cd             	mov    %rcx,%r13
  37:	41 54                	push   %r12
  39:	49 89 f4             	mov    %rsi,%r12
  3c:	53                   	push   %rbx
  3d:	48 89 fb             	mov    %rdi,%rbx

Code starting with the faulting instruction
===========================================
   0:	48 89 e5             	mov    %rsp,%rbp
   3:	41 56                	push   %r14
   5:	49 89 d6             	mov    %rdx,%r14
   8:	41 55                	push   %r13
   a:	49 89 cd             	mov    %rcx,%r13
   d:	41 54                	push   %r12
   f:	49 89 f4             	mov    %rsi,%r12
  12:	53                   	push   %rbx
  13:	48 89 fb             	mov    %rdi,%rbx
[   27.210048][    C2] RSP: 0018:ffffc90000cbfa20 EFLAGS: 00000246
[   27.210225][    C2] RAX: 0000000000000000 RBX: fffff52000197f46 RCX: 0000000000000000
[   27.210521][    C2] RDX: ffff888005b70040 RSI: ffffc90000cbfa50 RDI: ffffffffac5c8260
[   27.210732][    C2] RBP: ffffc90000cbfc10 R08: 0000000000000001 R09: fffffbfff63a98aa
[   27.210949][    C2] R10: ffffffffb1d4c557 R11: 0000000000000008 R12: ffff888036143530
[   27.211240][    C2] R13: ffff88800195aac0 R14: ffffea0000142e00 R15: ffff8880050b9188
[ 27.211450][ C2] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 27.211629][ C2] stack_trace_save (kernel/stacktrace.c:123) 
[ 27.211770][ C2] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 27.212001][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 27.212141][ C2] set_track_prepare (mm/slub.c:886) 
[ 27.212284][ C2] ? get_partial_node.part.0 (mm/slub.c:2623) 
[ 27.212426][ C2] ___slab_alloc (mm/slub.c:917 mm/slub.c:3515) 
[ 27.212564][ C2] ? kmem_cache_alloc (./include/linux/sched/mm.h:315 mm/slub.c:3746 mm/slub.c:3827 mm/slub.c:3852) 
[ 27.212702][ C2] ? vm_area_alloc (kernel/fork.c:467) 
[ 27.212842][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 27.212988][ C2] ? vm_area_alloc (kernel/fork.c:467) 
[ 27.213127][ C2] ? kmem_cache_alloc (mm/slub.c:3610 mm/slub.c:3663 mm/slub.c:3835 mm/slub.c:3852) 
[ 27.213266][ C2] kmem_cache_alloc (mm/slub.c:3610 mm/slub.c:3663 mm/slub.c:3835 mm/slub.c:3852) 
[ 27.213409][ C2] vm_area_alloc (kernel/fork.c:467) 
[ 27.213549][ C2] mmap_region (mm/mmap.c:2807) 
[ 27.213770][ C2] ? __pfx_arch_get_unmapped_area_topdown (arch/x86/kernel/sys_x86_64.c:157) 
[ 27.213949][ C2] ? __pfx_mmap_region (mm/mmap.c:2718) 
[ 27.214089][ C2] ? get_unmapped_area (mm/mmap.c:1854) 
[ 27.214230][ C2] do_mmap (mm/mmap.c:1385) 
[ 27.214336][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 27.214558][ C2] ? do_user_addr_fault (arch/x86/mm/fault.c:1443) 
[ 27.214701][ C2] vm_mmap_pgoff (mm/util.c:573) 
[ 27.214843][ C2] ? __pfx_vm_mmap_pgoff (mm/util.c:563) 
[ 27.214984][ C2] ? do_user_addr_fault (arch/x86/mm/fault.c:1443) 
[ 27.215206][ C2] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 27.215345][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   27.215517][    C2] RIP: 0033:0x7f99c5f68287
[ 27.215661][ C2] Code: c3 66 90 48 89 2b 48 c7 43 08 00 04 00 00 5b 5d 41 5c c3 f3 0f 1e fa 41 89 ca 41 f7 c1 ff 0f 00 00 75 10 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 19 c3 c7 05 46 ef 00 00 16 00 00 00 48 c7 c0
All code
========
   0:	c3                   	ret
   1:	66 90                	xchg   %ax,%ax
   3:	48 89 2b             	mov    %rbp,(%rbx)
   6:	48 c7 43 08 00 04 00 	movq   $0x400,0x8(%rbx)
   d:	00 
   e:	5b                   	pop    %rbx
   f:	5d                   	pop    %rbp
  10:	41 5c                	pop    %r12
  12:	c3                   	ret
  13:	f3 0f 1e fa          	endbr64
  17:	41 89 ca             	mov    %ecx,%r10d
  1a:	41 f7 c1 ff 0f 00 00 	test   $0xfff,%r9d
  21:	75 10                	jne    0x33
  23:	b8 09 00 00 00       	mov    $0x9,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 19                	ja     0x4b
  32:	c3                   	ret
  33:	c7 05 46 ef 00 00 16 	movl   $0x16,0xef46(%rip)        # 0xef83
  3a:	00 00 00 
  3d:	48                   	rex.W
  3e:	c7                   	.byte 0xc7
  3f:	c0                   	.byte 0xc0

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 19                	ja     0x21
   8:	c3                   	ret
   9:	c7 05 46 ef 00 00 16 	movl   $0x16,0xef46(%rip)        # 0xef59
  10:	00 00 00 
  13:	48                   	rex.W
  14:	c7                   	.byte 0xc7
  15:	c0                   	.byte 0xc0
[   27.216245][    C2] RSP: 002b:00007ffc038887a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
[   27.216561][    C2] RAX: ffffffffffffffda RBX: 00000000000000f0 RCX: 00007f99c5f68287
[   27.216768][    C2] RDX: 0000000000000003 RSI: 0000000000002000 RDI: 0000000000000000
[   27.216974][    C2] RBP: 0000000000002000 R08: 00000000ffffffff R09: 0000000000000000
[   27.217263][    C2] R10: 0000000000000022 R11: 0000000000000246 R12: 00007ffc03889d57


Finger prints:
dump_stack_lvl:mark_lock_irq:mark_lock:mark_usage