======================================
| [ 47.975126][ C1] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   47.975462][    C1]
| [   47.975591][    C1]
| [   47.975591][    C1] stack backtrace:
[   47.976477][    C1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   47.977271][    C1] Call Trace:
[   47.977465][    C1]  <IRQ>
[ 47.977605][ C1] dump_stack_lvl (lib/dump_stack.c:117) 
[ 47.977878][ C1] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 47.978192][ C1] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 47.978516][ C1] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 47.978783][ C1] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 47.979050][ C1] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 47.979309][ C1] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 47.979754][ C1] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 47.980015][ C1] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 47.980278][ C1] ? add_chain_cache (kernel/locking/lockdep.c:3730) 
[ 47.980542][ C1] ? save_trace (kernel/locking/lockdep.c:586) 
[ 47.980986][ C1] mark_lock (kernel/locking/lockdep.c:4678) 
[ 47.981110][ C1] mark_usage (kernel/locking/lockdep.c:4567) 
[ 47.981230][ C1] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 47.981390][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 47.981549][ C1] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 47.981923][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 47.982090][ C1] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 47.982322][ C1] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 47.982582][ C1] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 47.982739][ C1] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 47.982972][ C1] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 47.983129][ C1] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 47.983462][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 47.983621][ C1] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 47.983853][ C1] br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 47.984085][ C1] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 47.984455][ C1] call_timer_fn (kernel/time/timer.c:1793) 
[ 47.984614][ C1] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 47.984770][ C1] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 47.985030][ C1] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 47.985194][ C1] ? 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) 
[ 47.985351][ C1] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 47.985508][ C1] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 47.985666][ C1] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 47.985938][ C1] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 47.986095][ C1] ? 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) 
[ 47.986250][ C1] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 47.986505][ C1] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 47.986663][ C1] ? run_timer_softirq (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 47.986823][ C1] run_timer_softirq (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 47.986981][ C1] __do_softirq (kernel/softirq.c:554) 
[ 47.987139][ C1] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 47.987360][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   47.987517][    C1]  </IRQ>
[   47.987597][    C1]  <TASK>
[ 47.987676][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 47.987873][ C1] RIP: 0010:_raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 47.988196][ C1] Code: 10 e8 21 49 9b fd 48 89 ef e8 59 b9 9b 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 05 bf 8f 73 <74> 0e 5b 5d c3 cc cc cc cc e8 4f b3 be fd eb dc 0f 1f 44 00 00 5b
All code
========
   0:	10 e8                	adc    %ch,%al
   2:	21 49 9b             	and    %ecx,-0x65(%rcx)
   5:	fd                   	std
   6:	48 89 ef             	mov    %rbp,%rdi
   9:	e8 59 b9 9b fd       	call   0xfffffffffd9bb967
   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 05 bf 8f 73 	decl   %gs:0x738fbf05(%rip)        # 0x738fbf2f
  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 4f b3 be fd       	call   0xfffffffffdbeb387
  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 4f b3 be fd       	call   0xfffffffffdbeb35d
   e:	eb dc                	jmp    0xffffffffffffffec
  10:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  15:	5b                   	pop    %rbx
[   47.988748][    C1] RSP: 0018:ffffc9000072f318 EFLAGS: 00000286
[   47.988945][    C1] RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff1f25955
[   47.989181][    C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8c740911
[   47.989529][    C1] RBP: ffff888001040e00 R08: 0000000000000001 R09: fffffbfff1f238a9
[   47.989770][    C1] R10: ffffffff8f91c54f R11: 0000000000000400 R12: ffff8880023be7c8
[   47.990022][    C1] R13: 0000000000000000 R14: ffffc9000072f368 R15: ffff888005cd2800
[ 47.990364][ C1] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 47.990560][ C1] qlist_free_all (mm/kasan/quarantine.c:174) 
[ 47.990741][ C1] kasan_quarantine_reduce (./include/linux/srcu.h:285 mm/kasan/quarantine.c:287) 
[ 47.990901][ C1] __kasan_slab_alloc (mm/kasan/common.c:322) 
[ 47.991188][ C1] kmem_cache_alloc (./include/linux/kasan.h:201 mm/slub.c:3798 mm/slub.c:3845 mm/slub.c:3852) 
[ 47.991351][ C1] p9_tag_alloc (net/9p/client.c:285) 
[ 47.991508][ C1] ? __pfx_p9_tag_alloc (net/9p/client.c:277) 
[ 47.991678][ C1] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 47.991834][ C1] ? __debug_check_no_obj_freed (lib/debugobjects.c:1000) 
[ 47.992029][ C1] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 47.992186][ C1] p9_client_prepare_req (net/9p/client.c:641) 
[ 47.992348][ C1] ? __pfx_p9_client_prepare_req (net/9p/client.c:625) 
[ 47.992646][ C1] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 47.992846][ C1] ? __debug_check_no_obj_freed (lib/debugobjects.c:1000) 
[ 47.993042][ C1] p9_client_rpc (net/9p/client.c:688 (discriminator 4)) 
[ 47.993202][ C1] ? __pfx___debug_check_no_obj_freed (lib/debugobjects.c:960) 
[ 47.993497][ C1] ? __pfx_p9_client_rpc (net/9p/client.c:672) 
[ 47.993661][ C1] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 47.993865][ C1] ? kmem_cache_free (mm/slub.c:4280 mm/slub.c:4344) 
[ 47.994021][ C1] ? p9_req_put (net/9p/client.c:410) 
[ 47.994294][ C1] ? trace_kfree (./include/trace/events/kmem.h:94 (discriminator 52)) 
[ 47.994452][ C1] ? kfree (mm/slub.c:4379) 
[ 47.994574][ C1] p9_client_open (net/9p/client.c:1232) 
[ 47.994732][ C1] ? __pfx_p9_client_open (net/9p/client.c:1217) 
[ 47.994992][ C1] ? v9fs_fid_lookup_with_uid (fs/9p/fid.c:181) 
[ 47.995158][ C1] v9fs_file_open (fs/9p/vfs_file.c:71) 
[ 47.995327][ C1] ? __pfx_v9fs_file_open (fs/9p/vfs_file.c:41) 
[ 47.995485][ C1] ? do_dentry_open (fs/open.c:912) 
[ 47.995749][ C1] do_dentry_open (fs/open.c:955) 
[ 47.995913][ C1] ? __pfx_v9fs_file_open (fs/9p/vfs_file.c:41) 
[ 47.996072][ C1] ? backing_file_open (fs/backing-file.c:44) 
[ 47.996235][ C1] backing_file_open (fs/backing-file.c:45) 
[ 47.996393][ C1] ? inode_owner_or_capable (./include/linux/mnt_idmapping.h:81 fs/inode.c:2381) 
[ 47.996654][ C1] ovl_open_realfile (fs/overlayfs/file.c:54) 
[ 47.996815][ C1] ovl_open (fs/overlayfs/file.c:169) 
[ 47.996952][ C1] ? __pfx_ovl_open (fs/overlayfs/file.c:146) 
[ 47.997127][ C1] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 47.997387][ C1] ? do_dentry_open (fs/open.c:912) 
[ 47.997548][ C1] do_dentry_open (fs/open.c:955) 
[ 47.997706][ C1] ? __pfx_ovl_open (fs/overlayfs/file.c:146) 
[ 47.997870][ C1] ? may_open (fs/namei.c:3270) 
[ 47.997991][ C1] do_open (fs/namei.c:3643) 
[ 47.998212][ C1] path_openat (fs/namei.c:3799) 
[ 47.998369][ C1] ? __pfx_path_openat (fs/namei.c:3781) 
[ 47.998538][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 47.998696][ C1] do_filp_open (fs/namei.c:3826) 
[ 47.998954][ C1] ? __pfx_do_filp_open (fs/namei.c:3820) 
[ 47.999114][ C1] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 47.999272][ C1] ? __pfx_kfree_link (fs/libfs.c:1573) 
[ 47.999431][ C1] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 47.999689][ C1] ? alloc_fd (fs/file.c:555 (discriminator 10)) 
[ 47.999810][ C1] ? _raw_spin_unlock (./arch/x86/include/asm/preempt.h:94 ./include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) 
[ 47.999967][ C1] ? alloc_fd (fs/file.c:555 (discriminator 10)) 
[ 48.000092][ C1] do_sys_openat2 (fs/open.c:1406) 
[ 48.000250][ C1] ? __pfx_do_sys_openat2 (fs/open.c:1392) 
[ 48.000510][ C1] ? __pfx___debug_check_no_obj_freed (lib/debugobjects.c:960) 
[ 48.000704][ C1] ? __virt_addr_valid (./arch/x86/include/asm/preempt.h:94 ./include/linux/rcupdate.h:896 ./include/linux/mmzone.h:2029 arch/x86/mm/physaddr.c:65) 
[ 48.000862][ C1] __x64_sys_openat (fs/open.c:1432) 
[ 48.001032][ C1] ? __pfx___x64_sys_openat (fs/open.c:1432) 
[ 48.001292][ C1] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 48.001449][ C1] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   48.001646][    C1] RIP: 0033:0x7f0d85d9f0e8
[ 48.001810][ C1] 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
[   48.002578][    C1] RSP: 002b:00007ffda0104d88 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
[   48.002819][    C1] RAX: ffffffffffffffda RBX: 00007ffda010500f RCX: 00007f0d85d9f0e8
[   48.003058][    C1] RDX: 0000000000080000 RSI: 00007ffda0104e00 RDI: 00000000ffffff9c
[   48.003291][    C1] RBP: 00007ffda0104df0 R08: 0000000000080000 R09: 00007ffda0104e00
[   48.003625][    C1] R10: 0000000000000000 R11: 0000000000000287 R12: 00007ffda0104e07


Finger prints:
dump_stack_lvl:mark_lock_irq:mark_lock:mark_usage