======================================
| [ 21.700732][ C3] common_startup_64 (arch/x86/kernel/head_64.S:421) 
| [   21.700865][    C3]
| [   21.700932][    C3]
| [   21.700932][    C3] stack backtrace:
[   21.701370][    C3] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   21.701751][    C3] Call Trace:
[   21.701853][    C3]  <IRQ>
[ 21.701925][ C3] dump_stack_lvl (lib/dump_stack.c:117) 
[ 21.702065][ C3] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 21.702234][ C3] ? kernel_text_address (kernel/extable.c:99) 
[ 21.702370][ C3] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 21.702536][ C3] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 21.702672][ C3] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 21.702809][ C3] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 21.702943][ C3] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 21.703154][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:421) 
[ 21.703363][ C3] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 21.703499][ C3] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 21.703641][ C3] ? save_trace (kernel/locking/lockdep.c:586) 
[ 21.703783][ C3] mark_lock (kernel/locking/lockdep.c:4678) 
[ 21.703962][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 21.704104][ C3] mark_usage (kernel/locking/lockdep.c:4567) 
[ 21.704210][ C3] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 21.704346][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 21.704563][ C3] ? rt6_uncached_list_del (./include/linux/list.h:111 ./include/linux/list.h:215 ./include/linux/list.h:287 net/ipv6/route.c:155) 
[ 21.704700][ C3] ? __pfx___debug_check_no_obj_freed (lib/debugobjects.c:960) 
[ 21.704871][ C3] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 21.705008][ C3] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 21.705164][ C3] ? rt6_uncached_list_del (./include/linux/list.h:111 ./include/linux/list.h:215 ./include/linux/list.h:287 net/ipv6/route.c:155) 
[ 21.705312][ C3] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 21.705446][ C3] ? rt6_uncached_list_del (./include/linux/list.h:111 ./include/linux/list.h:215 ./include/linux/list.h:287 net/ipv6/route.c:155) 
[ 21.705576][ C3] _raw_spin_lock_bh (./include/linux/spinlock_api_smp.h:127 kernel/locking/spinlock.c:178) 
[ 21.705712][ C3] ? rt6_uncached_list_del (./include/linux/list.h:111 ./include/linux/list.h:215 ./include/linux/list.h:287 net/ipv6/route.c:155) 
[ 21.705924][ C3] rt6_uncached_list_del (./include/linux/list.h:111 ./include/linux/list.h:215 ./include/linux/list.h:287 net/ipv6/route.c:155) 
[ 21.706061][ C3] ip6_dst_destroy (net/ipv6/route.c:364) 
[ 21.706198][ C3] dst_destroy (net/core/dst.c:116) 
[ 21.706301][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2196) 
[ 21.706524][ C3] rcu_do_batch (kernel/rcu/tree.c:2196) 
[ 21.706660][ C3] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 21.706794][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2120) 
[ 21.706930][ C3] rcu_core (kernel/rcu/tree.c:2473) 
[ 21.707036][ C3] __do_softirq (kernel/softirq.c:554) 
[ 21.707180][ C3] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 21.707280][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   21.707412][    C3]  </IRQ>
[   21.707481][    C3]  <TASK>
[ 21.707552][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 21.707728][ C3] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:72 arch/x86/kernel/process.c:743) 
[ 21.707869][ C3] 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 d3 eb 32 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 d3 eb 32 00 	verw   0x32ebd3(%rip)        # 0x32ebfb
  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
[   21.708514][    C3] RSP: 0018:ffffc9000016fdf8 EFLAGS: 00000246
[   21.708693][    C3] RAX: 0000000000045abd RBX: 1ffff9200002dfc1 RCX: ffffffff9f332ea5
[   21.708901][    C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff9caac1d4
[   21.709262][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005ef709c
[   21.709471][    C3] R10: ffff88802f7b84e3 R11: 1ffff110003ac34c R12: 0000000000000000
[   21.709670][    C3] R13: ffff888001b98040 R14: dffffc0000000000 R15: 0000000000000000
[ 21.709873][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 21.710005][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:192) 
[ 21.710147][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 21.710364][ C3] cpuidle_idle_call (kernel/sched/idle.c:192) 
[ 21.710498][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 21.710633][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 21.710867][ C3] do_idle (kernel/sched/idle.c:332) 
[ 21.710971][ C3] cpu_startup_entry (kernel/sched/idle.c:429 (discriminator 1)) 
[ 21.711103][ C3] start_secondary (arch/x86/kernel/smpboot.c:201 arch/x86/kernel/smpboot.c:281) 
[ 21.711237][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:231) 


Finger prints:
common_startup_64:dump_stack_lvl:mark_lock_irq:mark_lock