======================================
| [ 31.574591][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   31.574771][    C2]
| [   31.574844][    C2]
| [   31.574844][    C2] stack backtrace:
[   31.575247][    C2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   31.575773][    C2] Call Trace:
[   31.575894][    C2]  <IRQ>
[ 31.575971][ C2] dump_stack_lvl (lib/dump_stack.c:117) 
[ 31.576121][ C2] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 31.576302][ C2] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 31.576456][ C2] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 31.576635][ C2] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 31.576779][ C2] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 31.576932][ C2] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 31.577175][ C2] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 31.577321][ C2] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 31.577470][ C2] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 31.577619][ C2] ? save_trace (kernel/locking/lockdep.c:586) 
[ 31.577865][ C2] mark_lock (kernel/locking/lockdep.c:4678) 
[ 31.577975][ C2] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 31.578120][ C2] mark_usage (kernel/locking/lockdep.c:4567) 
[ 31.578231][ C2] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 31.578378][ C2] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 31.578620][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 31.578764][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 31.578910][ C2] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 31.579059][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 31.579302][ C2] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 31.579448][ C2] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 31.579595][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 31.579740][ C2] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 31.579885][ C2] _raw_write_lock (./include/linux/rwlock_api_smp.h:210 kernel/locking/spinlock.c:300) 
[ 31.580126][ C2] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 31.580270][ C2] addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 31.580416][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 31.580567][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 31.580809][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 31.580954][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 31.581099][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 31.581244][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 31.581484][ C2] call_timer_fn (kernel/time/timer.c:1793) 
[ 31.581630][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 31.581779][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 31.581928][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 31.582166][ C2] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 31.582280][ C2] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 31.582429][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 31.582576][ C2] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 31.582727][ 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) 
[ 31.582968][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 31.583113][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 31.583259][ C2] ? run_timer_softirq (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 31.583411][ C2] run_timer_softirq (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 31.583654][ C2] __do_softirq (kernel/softirq.c:554) 
[ 31.583803][ C2] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 31.583917][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   31.584063][    C2]  </IRQ>
[   31.584139][    C2]  <TASK>
[ 31.584215][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 31.584396][ C2] RIP: 0010:_raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 31.584585][ C2] Code: 10 e8 81 31 79 fd 48 89 ef e8 b9 a1 79 fd 81 e3 00 02 00 00 75 1d 9c 58 f6 c4 02 75 29 48 85 db 74 01 fb 65 ff 0d f5 8b ed 6a <74> 0e 5b 5d c3 cc cc cc cc e8 0f 00 9d fd eb dc 0f 1f 44 00 00 5b
All code
========
   0:	10 e8                	adc    %ch,%al
   2:	81 31 79 fd 48 89    	xorl   $0x8948fd79,(%rcx)
   8:	ef                   	out    %eax,(%dx)
   9:	e8 b9 a1 79 fd       	call   0xfffffffffd79a1c7
   e:	81 e3 00 02 00 00    	and    $0x200,%ebx
  14:	75 1d                	jne    0x33
  16:	9c                   	pushf
  17:	58                   	pop    %rax
  18:	f6 c4 02             	test   $0x2,%ah
  1b:	75 29                	jne    0x46
  1d:	48 85 db             	test   %rbx,%rbx
  20:	74 01                	je     0x23
  22:	fb                   	sti
  23:	65 ff 0d f5 8b ed 6a 	decl   %gs:0x6aed8bf5(%rip)        # 0x6aed8c1f
  2a:*	74 0e                	je     0x3a		<-- trapping instruction
  2c:	5b                   	pop    %rbx
  2d:	5d                   	pop    %rbp
  2e:	c3                   	ret
  2f:	cc                   	int3
  30:	cc                   	int3
  31:	cc                   	int3
  32:	cc                   	int3
  33:	e8 0f 00 9d fd       	call   0xfffffffffd9d0047
  38:	eb dc                	jmp    0x16
  3a:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  3f:	5b                   	pop    %rbx

Code starting with the faulting instruction
===========================================
   0:	74 0e                	je     0x10
   2:	5b                   	pop    %rbx
   3:	5d                   	pop    %rbp
   4:	c3                   	ret
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	cc                   	int3
   9:	e8 0f 00 9d fd       	call   0xfffffffffd9d001d
   e:	eb dc                	jmp    0xffffffffffffffec
  10:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  15:	5b                   	pop    %rbx
[   31.585205][    C2] RSP: 0018:ffffc90000f3f7a0 EFLAGS: 00000282
[   31.585394][    C2] RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff2db2609
[   31.585726][    C2] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff95163de1
[   31.585953][    C2] RBP: ffff888001041080 R08: 0000000000000001 R09: fffffbfff2db2e8a
[   31.586170][    C2] R10: ffffffff96d97457 R11: 0000000000001000 R12: ffff888001041080
[   31.586388][    C2] R13: ffffea000016c000 R14: ffff8880010433c0 R15: ffff888005b04000
[ 31.586611][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 31.586813][ C2] get_partial_node.part.0 (mm/slub.c:2623) 
[ 31.586976][ C2] ___slab_alloc (mm/slub.c:2583 mm/slub.c:2701 mm/slub.c:3505) 
[ 31.587220][ C2] ? fs_reclaim_acquire (mm/page_alloc.c:3715 mm/page_alloc.c:3706) 
[ 31.587366][ C2] ? p9_fcall_init (net/9p/client.c:232) 
[ 31.587514][ C2] ? p9_fcall_init (net/9p/client.c:232) 
[ 31.587658][ C2] ? __kmalloc (mm/slub.c:3610 mm/slub.c:3663 mm/slub.c:3835 mm/slub.c:3965 mm/slub.c:3979) 
[ 31.587901][ C2] __kmalloc (mm/slub.c:3610 mm/slub.c:3663 mm/slub.c:3835 mm/slub.c:3965 mm/slub.c:3979) 
[ 31.588015][ C2] p9_fcall_init (net/9p/client.c:232) 
[ 31.588159][ C2] p9_tag_alloc (net/9p/client.c:297) 
[ 31.588304][ C2] ? __pfx_p9_tag_alloc (net/9p/client.c:277) 
[ 31.588552][ C2] p9_client_prepare_req (net/9p/client.c:641) 
[ 31.588702][ C2] ? __pfx_p9_client_prepare_req (net/9p/client.c:625) 
[ 31.588880][ C2] ? stack_depot_save_flags (lib/stackdepot.c:609) 
[ 31.589030][ C2] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 31.589264][ 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) 
[ 31.589408][ C2] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 31.589519][ C2] p9_client_rpc (net/9p/client.c:688 (discriminator 4)) 
[ 31.589664][ C2] ? __pfx_p9_client_rpc (net/9p/client.c:672) 
[ 31.589813][ C2] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 31.590048][ C2] ? v9fs_dir_release (./include/net/9p/client.h:269 fs/9p/vfs_dir.c:224) 
[ 31.590197][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 31.590341][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 31.590486][ 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) 
[ 31.590754][ C2] p9_client_clunk (net/9p/client.c:1438 (discriminator 3)) 
[ 31.590899][ C2] v9fs_dir_release (./include/net/9p/client.h:278 fs/9p/vfs_dir.c:224) 
[ 31.591044][ C2] __fput (fs/file_table.c:422) 
[ 31.591158][ C2] task_work_run (kernel/task_work.c:180 (discriminator 1)) 
[ 31.591310][ C2] ? __pfx_task_work_run (kernel/task_work.c:148) 
[ 31.591455][ C2] ? kmem_cache_free (mm/slub.c:4280 mm/slub.c:4344) 
[ 31.591599][ C2] ? do_exit (./include/linux/task_work.h:38 kernel/exit.c:878) 
[ 31.591711][ C2] do_exit (kernel/exit.c:879) 
[ 31.591820][ 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) 
[ 31.591970][ C2] ? __pfx_do_exit (kernel/exit.c:819) 
[ 31.592117][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 31.592263][ C2] do_group_exit (kernel/exit.c:1008) 
[ 31.592407][ C2] __x64_sys_exit_group (kernel/exit.c:1036) 
[ 31.592556][ C2] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 31.592810][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   31.592989][    C2] RIP: 0033:0x7f5fb313ca8d
[ 31.593140][ C2] Code: Unable to access opcode bytes at 0x7f5fb313ca63.

Code starting with the faulting instruction
===========================================
[   31.593329][    C2] RSP: 002b:00007ffda8dc5568 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   31.593547][    C2] RAX: ffffffffffffffda RBX: 00007f5fb32199c0 RCX: 00007f5fb313ca8d
[   31.593767][    C2] RDX: 00000000000000e7 RSI: fffffffffffffe90 RDI: 0000000000000000
[   31.594076][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000058
[   31.594289][    C2] R10: 00007ffda8dc5390 R11: 0000000000000246 R12: 00007f5fb32199c0


Finger prints:
dump_stack_lvl:mark_lock_irq:mark_lock:mark_usage