======================================
| [ 30.030817][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   30.031103][    C2]
| [   30.031179][    C2]
| [   30.031179][    C2] stack backtrace:
[   30.031596][    C2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   30.032027][    C2] Call Trace:
[   30.032144][    C2]  <IRQ>
[ 30.032239][ C2] dump_stack_lvl (lib/dump_stack.c:117) 
[ 30.032394][ C2] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 30.032682][ C2] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 30.032836][ C2] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 30.033027][ C2] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 30.033183][ C2] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 30.033432][ C2] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 30.033586][ C2] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 30.033739][ C2] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 30.033891][ C2] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 30.034144][ C2] ? save_trace (kernel/locking/lockdep.c:586) 
[ 30.034298][ C2] mark_lock (kernel/locking/lockdep.c:4678) 
[ 30.034413][ C2] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 30.034579][ C2] mark_usage (kernel/locking/lockdep.c:4567) 
[ 30.034711][ C2] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 30.034961][ C2] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 30.035126][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 30.035280][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 30.035433][ C2] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 30.035778][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 30.035932][ C2] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 30.036087][ C2] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 30.036241][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 30.036493][ C2] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 30.036645][ C2] _raw_write_lock (./include/linux/rwlock_api_smp.h:210 kernel/locking/spinlock.c:300) 
[ 30.036798][ C2] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 30.036949][ C2] addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 30.037107][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 30.037364][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 30.037519][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 30.037674][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 30.037826][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 30.038083][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 30.038235][ C2] call_timer_fn (kernel/time/timer.c:1793) 
[ 30.038386][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 30.038537][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 30.038788][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 30.038941][ 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) 
[ 30.039099][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 30.039253][ C2] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 30.039502][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 30.039655][ C2] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 30.039809][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 30.039962][ 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) 
[ 30.040115][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 30.040364][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 30.040515][ C2] ? timer_expire_remote (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2181) 
[ 30.040671][ C2] timer_expire_remote (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2181) 
[ 30.040826][ C2] 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) 
[ 30.041075][ C2] ? __pfx_tmigr_handle_remote_cpu (kernel/time/timer_migration.c:869) 
[ 30.041265][ 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) 
[ 30.041416][ C2] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 30.041533][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 30.041783][ C2] tmigr_handle_remote_up (kernel/time/timer_migration.c:1003) 
[ 30.041938][ C2] tmigr_handle_remote (kernel/time/timer_migration.c:488 kernel/time/timer_migration.c:1061) 
[ 30.042092][ C2] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1026) 
[ 30.042246][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 30.042495][ C2] __do_softirq (kernel/softirq.c:554) 
[ 30.042649][ C2] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 30.042765][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   30.042917][    C2]  </IRQ>
[   30.042997][    C2]  <TASK>
[ 30.043073][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 30.043358][ C2] RIP: 0010:_raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:160 kernel/locking/spinlock.c:202) 
[ 30.043563][ C2] Code: 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 e5 31 79 fd 48 89 ef e8 1d a2 79 fd e8 98 00 9d fd fb 65 ff 0d 68 8c ed 62 <74> 06 5d c3 cc cc cc cc 0f 1f 44 00 00 5d c3 cc cc cc cc 66 66 2e
All code
========
   0:	44 00 00             	add    %r8b,(%rax)
   3:	55                   	push   %rbp
   4:	48 8b 74 24 08       	mov    0x8(%rsp),%rsi
   9:	48 89 fd             	mov    %rdi,%rbp
   c:	48 83 c7 18          	add    $0x18,%rdi
  10:	e8 e5 31 79 fd       	call   0xfffffffffd7931fa
  15:	48 89 ef             	mov    %rbp,%rdi
  18:	e8 1d a2 79 fd       	call   0xfffffffffd79a23a
  1d:	e8 98 00 9d fd       	call   0xfffffffffd9d00ba
  22:	fb                   	sti
  23:	65 ff 0d 68 8c ed 62 	decl   %gs:0x62ed8c68(%rip)        # 0x62ed8c92
  2a:*	74 06                	je     0x32		<-- trapping instruction
  2c:	5d                   	pop    %rbp
  2d:	c3                   	ret
  2e:	cc                   	int3
  2f:	cc                   	int3
  30:	cc                   	int3
  31:	cc                   	int3
  32:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  37:	5d                   	pop    %rbp
  38:	c3                   	ret
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	cc                   	int3
  3c:	cc                   	int3
  3d:	66                   	data16
  3e:	66                   	data16
  3f:	2e                   	cs

Code starting with the faulting instruction
===========================================
   0:	74 06                	je     0x8
   2:	5d                   	pop    %rbp
   3:	c3                   	ret
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   d:	5d                   	pop    %rbp
   e:	c3                   	ret
   f:	cc                   	int3
  10:	cc                   	int3
  11:	cc                   	int3
  12:	cc                   	int3
  13:	66                   	data16
  14:	66                   	data16
  15:	2e                   	cs
[   30.044208][    C2] RSP: 0018:ffffc900006bf400 EFLAGS: 00000282
[   30.044403][    C2] RAX: 0000000000013511 RBX: 1ffff920000d7e85 RCX: 1ffffffff4084256
[   30.044632][    C2] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff9d163d58
[   30.044963][    C2] RBP: ffff888005ca6800 R08: 0000000000000001 R09: fffffbfff40836a5
[   30.045192][    C2] R10: ffffffffa041b52f R11: ffffc900006bef41 R12: ffff8880029527f0
[   30.045518][    C2] R13: 0000000000000000 R14: ffff8880029527e8 R15: 0000000000000000
[ 30.045749][ C2] ? _raw_spin_unlock_irq (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:77 ./include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202) 
[ 30.045904][ C2] p9_tag_alloc (./include/linux/local_lock_internal.h:36 ./include/linux/idr.h:174 net/9p/client.c:321) 
[ 30.046062][ C2] ? __pfx_p9_tag_alloc (net/9p/client.c:277) 
[ 30.046310][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 30.046464][ C2] ? __debug_check_no_obj_freed (lib/debugobjects.c:1000) 
[ 30.046660][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 30.046809][ C2] p9_client_prepare_req (net/9p/client.c:641) 
[ 30.047056][ C2] ? __pfx_p9_client_prepare_req (net/9p/client.c:625) 
[ 30.047270][ C2] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 30.047469][ C2] ? __debug_check_no_obj_freed (lib/debugobjects.c:1000) 
[ 30.047658][ C2] p9_client_rpc (net/9p/client.c:688 (discriminator 4)) 
[ 30.048004][ C2] ? __pfx___debug_check_no_obj_freed (lib/debugobjects.c:960) 
[ 30.048192][ C2] ? __pfx_p9_client_rpc (net/9p/client.c:672) 
[ 30.048344][ C2] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 30.048638][ C2] ? kmem_cache_free (mm/slub.c:4280 mm/slub.c:4344) 
[ 30.048790][ C2] ? p9_req_put (net/9p/client.c:410) 
[ 30.048937][ C2] ? trace_kfree (./include/trace/events/kmem.h:94 (discriminator 52)) 
[ 30.049089][ C2] ? kfree (mm/slub.c:4379) 
[ 30.049203][ C2] p9_client_open (net/9p/client.c:1232) 
[ 30.049476][ C2] ? __pfx_p9_client_open (net/9p/client.c:1217) 
[ 30.049628][ C2] ? v9fs_fid_lookup_with_uid (fs/9p/fid.c:181) 
[ 30.049784][ C2] v9fs_file_open (fs/9p/vfs_file.c:71) 
[ 30.049936][ C2] ? __pfx_v9fs_file_open (fs/9p/vfs_file.c:41) 
[ 30.050185][ C2] ? do_dentry_open (fs/open.c:912) 
[ 30.050338][ C2] do_dentry_open (fs/open.c:955) 
[ 30.050494][ C2] ? __pfx_v9fs_file_open (fs/9p/vfs_file.c:41) 
[ 30.050645][ C2] ? backing_file_open (fs/backing-file.c:44) 
[ 30.050895][ C2] backing_file_open (fs/backing-file.c:45) 
[ 30.051048][ C2] ovl_open_realfile (fs/overlayfs/file.c:54) 
[ 30.051209][ C2] ovl_open (fs/overlayfs/file.c:169) 
[ 30.051325][ C2] ? __pfx_ovl_open (fs/overlayfs/file.c:146) 
[ 30.051477][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 30.051734][ C2] ? do_dentry_open (fs/open.c:912) 
[ 30.051888][ C2] do_dentry_open (fs/open.c:955) 
[ 30.052046][ C2] ? __pfx_ovl_open (fs/overlayfs/file.c:146) 
[ 30.052198][ C2] ? may_open (fs/namei.c:3270) 
[ 30.052410][ C2] do_open (fs/namei.c:3643) 
[ 30.052527][ C2] path_openat (fs/namei.c:3799) 
[ 30.052679][ C2] ? __pfx_path_openat (fs/namei.c:3781) 
[ 30.052831][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 30.052984][ C2] do_filp_open (fs/namei.c:3826) 
[ 30.053237][ C2] ? __pfx_do_filp_open (fs/namei.c:3820) 
[ 30.053399][ C2] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 30.053557][ C2] ? __pfx_kfree_link (fs/libfs.c:1573) 
[ 30.053710][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 30.053958][ C2] ? alloc_fd (fs/file.c:555 (discriminator 10)) 
[ 30.054075][ C2] ? _raw_spin_unlock (./arch/x86/include/asm/preempt.h:94 ./include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) 
[ 30.054229][ C2] ? alloc_fd (fs/file.c:555 (discriminator 10)) 
[ 30.054345][ C2] do_sys_openat2 (fs/open.c:1406) 
[ 30.054497][ C2] ? vfs_fstatat (fs/stat.c:308) 
[ 30.054752][ C2] ? __pfx_do_sys_openat2 (fs/open.c:1392) 
[ 30.054917][ C2] ? __pfx___do_sys_newfstatat (fs/stat.c:464) 
[ 30.055073][ C2] __x64_sys_openat (fs/open.c:1432) 
[ 30.055226][ C2] ? __pfx___x64_sys_openat (fs/open.c:1432) 
[ 30.055476][ C2] ? __pfx_do_faccessat (fs/open.c:465) 
[ 30.055631][ C2] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 30.055782][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   30.055976][    C2] RIP: 0033:0x7f57d671a0e8
[ 30.056231][ C2] Code: f9 41 89 f0 41 83 e2 40 75 30 89 f0 25 00 00 41 00 3d 00 00 41 00 74 22 44 89 c2 4c 89 ce bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 30 c3 0f 1f 80 00 00 00 00 48 8d 44 24 08 c7
All code
========
   0:	f9                   	stc
   1:	41 89 f0             	mov    %esi,%r8d
   4:	41 83 e2 40          	and    $0x40,%r10d
   8:	75 30                	jne    0x3a
   a:	89 f0                	mov    %esi,%eax
   c:	25 00 00 41 00       	and    $0x410000,%eax
  11:	3d 00 00 41 00       	cmp    $0x410000,%eax
  16:	74 22                	je     0x3a
  18:	44 89 c2             	mov    %r8d,%edx
  1b:	4c 89 ce             	mov    %r9,%rsi
  1e:	bf 9c ff ff ff       	mov    $0xffffff9c,%edi
  23:	b8 01 01 00 00       	mov    $0x101,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 30                	ja     0x62
  32:	c3                   	ret
  33:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  3a:	48 8d 44 24 08       	lea    0x8(%rsp),%rax
  3f:	c7                   	.byte 0xc7

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 30                	ja     0x38
   8:	c3                   	ret
   9:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  10:	48 8d 44 24 08       	lea    0x8(%rsp),%rax
  15:	c7                   	.byte 0xc7
[   30.056770][    C2] RSP: 002b:00007fff8fa965d8 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
[   30.057099][    C2] RAX: ffffffffffffffda RBX: 00007fff8fa9686f RCX: 00007f57d671a0e8
[   30.057333][    C2] RDX: 0000000000080000 RSI: 00007fff8fa96650 RDI: 00000000ffffff9c
[   30.057562][    C2] RBP: 00007fff8fa96640 R08: 0000000000080000 R09: 00007fff8fa96650
[   30.057889][    C2] R10: 0000000000000000 R11: 0000000000000287 R12: 00007fff8fa96657


Finger prints:
dump_stack_lvl:mark_lock_irq:mark_lock:mark_usage