======================================
| [ 54.135568][ C1] common_startup_64 (arch/x86/kernel/head_64.S:421) 
| [   54.135812][    C1]
| [   54.135934][    C1]
| [   54.135934][    C1] stack backtrace:
[   54.136593][    C1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   54.137268][    C1] Call Trace:
[   54.137447][    C1]  <IRQ>
[ 54.137570][ C1] dump_stack_lvl (lib/dump_stack.c:117) 
[ 54.137800][ C1] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 54.138357][ C1] ? common_startup_64 (arch/x86/kernel/head_64.S:421) 
[ 54.138592][ C1] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 54.138872][ C1] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 54.139101][ C1] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 54.139465][ C1] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 54.139696][ C1] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 54.139924][ C1] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 54.140152][ C1] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 54.140380][ C1] ? add_chain_cache (kernel/locking/lockdep.c:3730) 
[ 54.140749][ C1] ? save_trace (kernel/locking/lockdep.c:586) 
[ 54.140996][ C1] mark_lock (kernel/locking/lockdep.c:4678) 
[ 54.141171][ C1] mark_usage (kernel/locking/lockdep.c:4567) 
[ 54.141350][ C1] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 54.141723][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 54.141964][ C1] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 54.142373][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 54.142612][ C1] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 54.143143][ C1] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 54.143383][ C1] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 54.143631][ C1] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 54.143999][ C1] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 54.144241][ C1] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 54.144616][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 54.144863][ C1] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 54.145232][ C1] br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 54.145749][ C1] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 54.146179][ C1] call_timer_fn (kernel/time/timer.c:1793) 
[ 54.146415][ C1] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 54.146809][ C1] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 54.147046][ C1] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 54.147287][ C1] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 54.147473][ C1] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 54.147719][ C1] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 54.148301][ C1] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 54.148535][ C1] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 54.148777][ 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) 
[ 54.149010][ C1] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 54.149251][ C1] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 54.149494][ C1] ? timer_expire_remote (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2181) 
[ 54.149732][ C1] timer_expire_remote (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2181) 
[ 54.150004][ C1] tmigr_handle_remote_cpu (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:67 ./arch/x86/include/asm/irqflags.h:127 kernel/time/timer_migration.c:925) 
[ 54.150396][ C1] ? __pfx_tmigr_handle_remote_cpu (kernel/time/timer_migration.c:869) 
[ 54.150709][ C1] tmigr_handle_remote_up (kernel/time/timer_migration.c:1003) 
[ 54.150967][ C1] tmigr_handle_remote (kernel/time/timer_migration.c:488 kernel/time/timer_migration.c:1061) 
[ 54.151208][ C1] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1026) 
[ 54.151603][ C1] __do_softirq (kernel/softirq.c:554) 
[ 54.151852][ C1] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 54.152041][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   54.152281][    C1]  </IRQ>
[   54.152406][    C1]  <TASK>
[ 54.152694][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 54.152981][ C1] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:72 arch/x86/kernel/process.c:743) 
[ 54.153219][ C1] 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 93 20 35 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 93 20 35 00 	verw   0x352093(%rip)        # 0x3520bb
  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
[   54.154191][    C1] RSP: 0018:ffffc9000014fdf8 EFLAGS: 00000242
[   54.154483][    C1] RAX: 00000000000b2845 RBX: 1ffff92000029fc1 RCX: ffffffffa310f9e5
[   54.154981][    C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffa0aaa4a4
[   54.155326][    C1] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c1709c
[   54.155682][    C1] R10: ffff8880360b84e3 R11: ffff8880360bdc80 R12: 0000000000000000
[   54.156036][    C1] R13: ffff888001b7a300 R14: dffffc0000000000 R15: 0000000000000000
[ 54.156384][ C1] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 54.156613][ C1] ? cpuidle_idle_call (kernel/sched/idle.c:192) 
[ 54.156844][ C1] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 54.157222][ C1] cpuidle_idle_call (kernel/sched/idle.c:192) 
[ 54.157449][ C1] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 54.157673][ C1] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 54.157902][ C1] do_idle (kernel/sched/idle.c:332) 
[ 54.158079][ C1] cpu_startup_entry (kernel/sched/idle.c:429 (discriminator 1)) 
[ 54.158324][ C1] start_secondary (arch/x86/kernel/smpboot.c:201 arch/x86/kernel/smpboot.c:281) 
[ 54.158568][ C1] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:231) 


Finger prints:
common_startup_64:dump_stack_lvl:mark_lock_irq:mark_lock