======================================
| [ 34.946410][ C3] common_startup_64 (arch/x86/kernel/head_64.S:421) 
| [   34.946542][    C3]
| [   34.946628][    C3]
| [   34.946628][    C3] stack backtrace:
[   34.947080][    C3] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   34.947484][    C3] Call Trace:
[   34.947589][    C3]  <IRQ>
[ 34.947658][ C3] dump_stack_lvl (lib/dump_stack.c:117) 
[ 34.947817][ C3] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 34.947990][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:421) 
[ 34.948216][ C3] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 34.948388][ C3] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 34.948537][ C3] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 34.948670][ C3] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 34.948887][ C3] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 34.949040][ C3] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 34.949171][ C3] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 34.949321][ C3] ? add_chain_cache (kernel/locking/lockdep.c:3730) 
[ 34.949537][ C3] ? save_trace (kernel/locking/lockdep.c:586) 
[ 34.949684][ C3] mark_lock (kernel/locking/lockdep.c:4678) 
[ 34.949797][ C3] mark_usage (kernel/locking/lockdep.c:4567) 
[ 34.949908][ C3] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 34.950041][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 34.950264][ C3] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) 
[ 34.950437][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 34.950577][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 34.950755][ C3] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 34.950997][ C3] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 34.951129][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 34.951291][ C3] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 34.951422][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 34.951660][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 34.951804][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 34.951971][ C3] br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 34.952232][ C3] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) 
[ 34.952446][ C3] call_timer_fn (kernel/time/timer.c:1793) 
[ 34.952584][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 34.952731][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 34.952961][ C3] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 34.953105][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 34.953273][ C3] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 34.953404][ C3] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) 
[ 34.953674][ C3] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 34.953827][ C3] ? 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) 
[ 34.953982][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 34.954122][ C3] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 34.954264][ C3] ? run_timer_softirq (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 34.954397][ C3] run_timer_softirq (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 34.954530][ C3] __do_softirq (kernel/softirq.c:554) 
[ 34.954685][ C3] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 34.954786][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   34.955018][    C3]  </IRQ>
[   34.955087][    C3]  <TASK>
[ 34.955158][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 34.955344][ C3] RIP: 0010:finish_task_switch.isra.0 (./arch/x86/include/asm/jump_label.h:27 kernel/sched/core.c:4969 kernel/sched/core.c:5293) 
[ 34.955516][ C3] Code: 4c 89 ff 48 c7 03 00 00 00 00 ff d2 0f 1f 00 4d 85 e4 75 ba 4c 89 ff e8 81 1c 76 02 e8 3c 98 2d 00 fb 65 48 8b 1d 93 a3 be 7a <66> 90 48 83 7d d0 00 74 55 65 48 8b 1d 82 a3 be 7a 48 8d bb 00 05
All code
========
   0:	4c 89 ff             	mov    %r15,%rdi
   3:	48 c7 03 00 00 00 00 	movq   $0x0,(%rbx)
   a:	ff d2                	call   *%rdx
   c:	0f 1f 00             	nopl   (%rax)
   f:	4d 85 e4             	test   %r12,%r12
  12:	75 ba                	jne    0xffffffffffffffce
  14:	4c 89 ff             	mov    %r15,%rdi
  17:	e8 81 1c 76 02       	call   0x2761c9d
  1c:	e8 3c 98 2d 00       	call   0x2d985d
  21:	fb                   	sti
  22:	65 48 8b 1d 93 a3 be 	mov    %gs:0x7abea393(%rip),%rbx        # 0x7abea3bd
  29:	7a 
  2a:*	66 90                	xchg   %ax,%ax		<-- trapping instruction
  2c:	48 83 7d d0 00       	cmpq   $0x0,-0x30(%rbp)
  31:	74 55                	je     0x88
  33:	65 48 8b 1d 82 a3 be 	mov    %gs:0x7abea382(%rip),%rbx        # 0x7abea3bd
  3a:	7a 
  3b:	48                   	rex.W
  3c:	8d                   	.byte 0x8d
  3d:	bb                   	.byte 0xbb
  3e:	00                   	.byte 0x0
  3f:	05                   	.byte 0x5

Code starting with the faulting instruction
===========================================
   0:	66 90                	xchg   %ax,%ax
   2:	48 83 7d d0 00       	cmpq   $0x0,-0x30(%rbp)
   7:	74 55                	je     0x5e
   9:	65 48 8b 1d 82 a3 be 	mov    %gs:0x7abea382(%rip),%rbx        # 0x7abea393
  10:	7a 
  11:	48                   	rex.W
  12:	8d                   	.byte 0x8d
  13:	bb                   	.byte 0xbb
  14:	00                   	.byte 0x0
  15:	05                   	.byte 0x5
[   34.956132][    C3] RSP: 0018:ffffc9000016fd08 EFLAGS: 00000206
[   34.956317][    C3] RAX: 0000000000094a5f RBX: ffff888001b90040 RCX: 1ffffffff12e6f61
[   34.956526][    C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff85452424
[   34.956739][    C3] RBP: ffffc9000016fd48 R08: 0000000000000001 R09: fffffbfff12e77e2
[   34.956969][    C3] R10: ffffffff8973bf17 R11: ffff8880361bdc40 R12: ffff8880361bda98
[   34.957189][    C3] R13: ffff888005e82300 R14: ffff8880361bda80 R15: ffff8880361bda80
[ 34.957393][ C3] ? finish_task_switch.isra.0 (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:77 kernel/sched/sched.h:1397 kernel/sched/core.c:5163 kernel/sched/core.c:5281) 
[ 34.957659][ C3] ? finish_task_switch.isra.0 (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:77 kernel/sched/sched.h:1397 kernel/sched/core.c:5163 kernel/sched/core.c:5281) 
[ 34.957837][ C3] ? __switch_to (./arch/x86/include/asm/bitops.h:55 ./include/asm-generic/bitops/instrumented-atomic.h:29 ./include/linux/thread_info.h:89 ./include/linux/sched.h:1926 ./arch/x86/include/asm/fpu/sched.h:68 arch/x86/kernel/process_64.c:674) 
[ 34.957991][ C3] __schedule (kernel/sched/core.c:6617) 
[ 34.958126][ C3] ? __pfx___schedule (kernel/sched/core.c:6617) 
[ 34.958360][ C3] ? trace_rcu_dyntick (./include/trace/events/rcu.h:480 (discriminator 52)) 
[ 34.958510][ C3] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 34.958687][ C3] schedule_idle (./arch/x86/include/asm/bitops.h:206 (discriminator 1) ./arch/x86/include/asm/bitops.h:238 (discriminator 1) ./include/linux/thread_info.h:184 (discriminator 1) ./include/linux/sched.h:2106 (discriminator 1) kernel/sched/core.c:6865 (discriminator 1)) 
[ 34.958827][ C3] do_idle (kernel/sched/idle.c:364) 
[ 34.959003][ C3] cpu_startup_entry (kernel/sched/idle.c:429 (discriminator 1)) 
[ 34.959135][ C3] start_secondary (arch/x86/kernel/smpboot.c:201 arch/x86/kernel/smpboot.c:281) 
[ 34.959291][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:231) 


Finger prints:
common_startup_64:dump_stack_lvl:mark_lock_irq:mark_lock