======================================
| [ 76.371132][ C2] common_startup_64 (arch/x86/kernel/head_64.S:421) 
| [   76.371274][    C2]
| [   76.371348][    C2]
| [   76.371348][    C2] stack backtrace:
[   76.371734][    C2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   76.372054][    C2] Call Trace:
[   76.372170][    C2]  <IRQ>
[ 76.372248][ C2] dump_stack_lvl (lib/dump_stack.c:117) 
[ 76.372396][ C2] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 76.372575][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:421) 
[ 76.372719][ C2] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 76.372895][ C2] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 76.373039][ C2] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 76.373185][ C2] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 76.373332][ C2] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 76.373482][ C2] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 76.373626][ C2] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 76.373771][ C2] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 76.373915][ C2] ? save_trace (kernel/locking/lockdep.c:586) 
[ 76.374058][ C2] mark_lock (kernel/locking/lockdep.c:4678) 
[ 76.374166][ C2] mark_usage (kernel/locking/lockdep.c:4567) 
[ 76.374276][ C2] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 76.374421][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 76.374568][ C2] ? sch_direct_xmit (./include/linux/netdevice.h:4345 (discriminator 1) net/sched/sch_generic.c:341 (discriminator 1)) 
[ 76.374713][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 76.374856][ C2] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 76.374999][ C2] ? sch_direct_xmit (./include/linux/netdevice.h:4345 (discriminator 1) net/sched/sch_generic.c:341 (discriminator 1)) 
[ 76.375142][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 76.375283][ C2] ? sch_direct_xmit (./include/linux/netdevice.h:4345 (discriminator 1) net/sched/sch_generic.c:341 (discriminator 1)) 
[ 76.375430][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 76.375574][ C2] ? sch_direct_xmit (./include/linux/netdevice.h:4345 (discriminator 1) net/sched/sch_generic.c:341 (discriminator 1)) 
[ 76.375809][ C2] sch_direct_xmit (./include/linux/netdevice.h:4345 (discriminator 1) net/sched/sch_generic.c:341 (discriminator 1)) 
[ 76.375956][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 76.376100][ C2] ? __pfx_sch_direct_xmit (net/sched/sch_generic.c:318) 
[ 76.376242][ C2] ? __dev_xmit_skb (./include/net/sch_generic.h:195 ./include/net/sch_generic.h:192 net/core/dev.c:3779) 
[ 76.376468][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 76.376608][ C2] ? __dev_xmit_skb (./include/net/sch_generic.h:195 ./include/net/sch_generic.h:192 net/core/dev.c:3779) 
[ 76.376751][ C2] __dev_xmit_skb (net/core/dev.c:3792) 
[ 76.376893][ C2] ? __pfx___dev_xmit_skb (net/core/dev.c:3767) 
[ 76.377033][ C2] ? __dev_queue_xmit (./include/linux/bottom_half.h:20 ./include/linux/rcupdate.h:833 net/core/dev.c:4297) 
[ 76.377262][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 76.377405][ C2] ? __dev_queue_xmit (./include/linux/bottom_half.h:20 ./include/linux/rcupdate.h:833 net/core/dev.c:4297) 
[ 76.377548][ C2] __dev_queue_xmit (net/core/dev.c:4338) 
[ 76.377691][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 76.377924][ C2] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) 
[ 76.378100][ C2] ? __pfx___dev_queue_xmit (net/core/dev.c:4281) 
[ 76.378242][ C2] ? neigh_hh_output (./include/linux/seqlock.h:74 ./include/linux/seqlock.h:772 ./include/net/neighbour.h:496) 
[ 76.378389][ C2] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
[ 76.378627][ C2] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
[ 76.378774][ 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) 
[ 76.378916][ C2] ip6_output (./include/linux/netfilter.h:303 net/ipv6/ip6_output.c:243) 
[ 76.379040][ C2] ? __pfx_ip6_output (net/ipv6/ip6_output.c:230) 
[ 76.379190][ C2] ? lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 76.379333][ C2] NF_HOOK.constprop.0 (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 ./include/linux/netfilter.h:238 ./include/linux/netfilter.h:312) 
[ 76.379475][ C2] ? ndisc_send_skb (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/ipv6/ndisc.c:455 net/ipv6/ndisc.c:503) 
[ 76.379616][ C2] ? __pfx_NF_HOOK.constprop.0 (./include/linux/netfilter.h:308) 
[ 76.379759][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 76.379988][ C2] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 76.380131][ C2] ndisc_send_skb (net/ipv6/ndisc.c:512 (discriminator 60)) 
[ 76.380272][ C2] ? __pfx_ndisc_send_skb (net/ipv6/ndisc.c:473) 
[ 76.380415][ C2] ? __ndisc_fill_addr_option (net/ipv6/ndisc.c:160) 
[ 76.380650][ C2] addrconf_rs_timer (net/ipv6/addrconf.c:4043) 
[ 76.380793][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 76.380942][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 76.381087][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 76.381229][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 76.381377][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 76.381517][ C2] call_timer_fn (kernel/time/timer.c:1793) 
[ 76.381658][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 76.381882][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 76.382023][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 76.382163][ C2] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 76.382274][ C2] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 76.382420][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 76.382652][ C2] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 76.382795][ 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) 
[ 76.382942][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 76.383087][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 76.383234][ C2] ? run_timer_softirq (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 76.383380][ C2] run_timer_softirq (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 76.383521][ C2] __do_softirq (kernel/softirq.c:554) 
[ 76.383663][ C2] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 76.383772][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   76.383998][    C2]  </IRQ>
[   76.384070][    C2]  <TASK>
[ 76.384141][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 76.384317][ C2] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:72 arch/x86/kernel/process.c:743) 
[ 76.384464][ C2] 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
[   76.385062][    C2] RSP: 0018:ffffc9000015fdf8 EFLAGS: 00000242
[   76.385246][    C2] RAX: 000000000023be25 RBX: 1ffff9200002bfc1 RCX: ffffffff95932ea5
[   76.385462][    C2] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff930ac1d4
[   76.385676][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005ee709c
[   76.386061][    C2] R10: ffff88802f7384e3 R11: ffff88802f72d9b0 R12: 0000000000000000
[   76.386280][    C2] R13: ffff888001b8c5c0 R14: dffffc0000000000 R15: 0000000000000000
[ 76.386495][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 76.386723][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:192) 
[ 76.386865][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 76.387006][ C2] cpuidle_idle_call (kernel/sched/idle.c:192) 
[ 76.387147][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 76.387374][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 76.387520][ C2] do_idle (kernel/sched/idle.c:332) 
[ 76.387628][ C2] cpu_startup_entry (kernel/sched/idle.c:429 (discriminator 1)) 
[ 76.387770][ C2] start_secondary (arch/x86/kernel/smpboot.c:201 arch/x86/kernel/smpboot.c:281) 
[ 76.387913][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:231) 


Finger prints:
common_startup_64:dump_stack_lvl:mark_lock_irq:mark_lock