======================================
| [ 43.346047][ C0] common_startup_64 (arch/x86/kernel/head_64.S:421) 
| [   43.346209][    C0]
| [   43.346287][    C0]
| [   43.346287][    C0] stack backtrace:
[   43.346802][    C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   43.347144][    C0] Call Trace:
[   43.347273][    C0]  <IRQ>
[ 43.347439][ C0] dump_stack_lvl (lib/dump_stack.c:117) 
[ 43.347601][ C0] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 43.347804][ C0] ? common_startup_64 (arch/x86/kernel/head_64.S:421) 
[ 43.347980][ C0] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 43.348277][ C0] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 43.348444][ C0] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 43.348614][ C0] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 43.348780][ C0] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 43.349035][ C0] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 43.349227][ C0] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 43.349382][ C0] ? add_chain_cache (kernel/locking/lockdep.c:3730) 
[ 43.349564][ C0] ? save_trace (kernel/locking/lockdep.c:586) 
[ 43.349732][ C0] mark_lock (kernel/locking/lockdep.c:4678) 
[ 43.349957][ C0] mark_usage (kernel/locking/lockdep.c:4567) 
[ 43.350105][ C0] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 43.350263][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 43.350433][ C0] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) 
[ 43.350739][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 43.350896][ C0] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 43.351088][ C0] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 43.351242][ C0] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 43.351484][ C0] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 43.351675][ C0] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 43.351827][ C0] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 43.352023][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 43.352271][ C0] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 43.352462][ C0] br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 43.352664][ C0] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) 
[ 43.352856][ C0] call_timer_fn (kernel/time/timer.c:1793) 
[ 43.353014][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 43.353170][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 43.353324][ C0] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 43.353479][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 43.353723][ C0] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 43.353879][ C0] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) 
[ 43.354074][ C0] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 43.354230][ C0] ? 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) 
[ 43.354470][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 43.354624][ C0] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 43.354777][ C0] ? run_timer_softirq (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 43.354933][ C0] run_timer_softirq (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 43.355184][ C0] __do_softirq (kernel/softirq.c:554) 
[ 43.355341][ C0] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 43.355456][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   43.355612][    C0]  </IRQ>
[   43.355692][    C0]  <TASK>
[ 43.355972][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 43.356169][ C0] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:72 arch/x86/kernel/process.c:743) 
[ 43.356335][ C0] 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 b3 f7 2d 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 b3 f7 2d 00 	verw   0x2df7b3(%rip)        # 0x2df7db
  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
[   43.356976][    C0] RSP: 0018:ffffffffba207e00 EFLAGS: 00000246
[   43.357176][    C0] RAX: 00000000000aac47 RBX: 1ffffffff7440fc2 RCX: ffffffffb93822c5
[   43.357500][    C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffb6caa4a4
[   43.357733][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c0709c
[   43.357965][    C0] R10: ffff8880360384e3 R11: ffff88803602d9b0 R12: 0000000000000000
[   43.358282][    C0] R13: ffffffffba21d000 R14: dffffc0000000000 R15: 0000000000014770
[ 43.358514][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 43.358674][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:192) 
[ 43.358829][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 43.359071][ C0] cpuidle_idle_call (kernel/sched/idle.c:192) 
[ 43.359228][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 43.359383][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 43.359539][ C0] do_idle (kernel/sched/idle.c:332) 
[ 43.359762][ C0] cpu_startup_entry (kernel/sched/idle.c:429 (discriminator 1)) 
[ 43.359946][ C0] rest_init (./include/linux/rcupdate.h:782 init/main.c:703) 
[ 43.360064][ C0] start_kernel (init/main.c:1024 (discriminator 1)) 
[ 43.360226][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:495) 
[ 43.360396][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:437 (discriminator 17)) 


Finger prints:
common_startup_64:dump_stack_lvl:mark_lock_irq:mark_lock