======================================
| [ 47.453849][ C3] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   47.454056][    C3]
| [   47.454138][    C3]
| [   47.454138][    C3] stack backtrace:
[   47.454679][    C3] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   47.455046][    C3] Call Trace:
[   47.455175][    C3]  <IRQ>
[ 47.455353][ C3] dump_stack_lvl (lib/dump_stack.c:117) 
[ 47.455521][ C3] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 47.455728][ C3] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 47.455936][ C3] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 47.456194][ C3] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 47.456359][ C3] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 47.456527][ C3] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 47.456692][ C3] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 47.456946][ C3] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 47.457110][ C3] ? add_chain_cache (kernel/locking/lockdep.c:3730) 
[ 47.457275][ C3] ? save_trace (kernel/locking/lockdep.c:586) 
[ 47.457440][ C3] mark_lock (kernel/locking/lockdep.c:4678) 
[ 47.457564][ C3] mark_usage (kernel/locking/lockdep.c:4567) 
[ 47.457780][ C3] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 47.457944][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 47.458111][ C3] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) 
[ 47.458318][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 47.458573][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 47.458778][ C3] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 47.458951][ C3] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 47.459117][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 47.459412][ C3] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 47.459575][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 47.459782][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 47.459946][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 47.460247][ C3] br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 47.460454][ C3] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) 
[ 47.460656][ C3] call_timer_fn (kernel/time/timer.c:1793) 
[ 47.460912][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 47.461078][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 47.461244][ C3] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 47.461408][ C3] ? 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) 
[ 47.461576][ C3] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 47.461835][ C3] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 47.462002][ C3] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) 
[ 47.462211][ C3] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 47.462379][ C3] ? 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) 
[ 47.462638][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 47.462804][ C3] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 47.462966][ C3] ? run_timer_softirq (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 47.463132][ C3] run_timer_softirq (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 47.463387][ C3] __do_softirq (kernel/softirq.c:554) 
[ 47.463555][ C3] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 47.463679][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   47.463844][    C3]  </IRQ>
[   47.463931][    C3]  <TASK>
[ 47.464116][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 47.464320][ C3] RIP: 0010:_raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 47.464535][ C3] Code: 10 e8 81 21 79 fd 48 89 ef e8 b9 91 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 7b cd 66 <74> 0e 5b 5d c3 cc cc cc cc e8 0f f0 9c fd eb dc 0f 1f 44 00 00 5b
All code
========
   0:	10 e8                	adc    %ch,%al
   2:	81 21 79 fd 48 89    	andl   $0x8948fd79,(%rcx)
   8:	ef                   	out    %eax,(%dx)
   9:	e8 b9 91 79 fd       	call   0xfffffffffd7991c7
   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 7b cd 66 	decl   %gs:0x66cd7bf5(%rip)        # 0x66cd7c1f
  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 f0 9c fd       	call   0xfffffffffd9cf047
  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 f0 9c fd       	call   0xfffffffffd9cf01d
   e:	eb dc                	jmp    0xffffffffffffffec
  10:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  15:	5b                   	pop    %rbx
[   47.465121][    C3] RSP: 0018:ffffc9000055f578 EFLAGS: 00000286
[   47.465331][    C3] RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff38c5355
[   47.465679][    C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff99364de1
[   47.465928][    C3] RBP: ffff888001040cc0 R08: 0000000000000001 R09: fffffbfff38c32a9
[   47.466176][    C3] R10: ffffffff9c61954f R11: 0000000000000200 R12: ffff888006033800
[   47.466520][    C3] R13: 0000000000000000 R14: ffffc9000055f5c8 R15: ffff888006030200
[ 47.466767][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 47.466974][ C3] qlist_free_all (mm/kasan/quarantine.c:174) 
[ 47.467233][ C3] ? p9pdu_vreadf (./include/linux/slab.h:632 net/9p/protocol.c:313) 
[ 47.467400][ C3] kasan_quarantine_reduce (./include/linux/srcu.h:285 mm/kasan/quarantine.c:287) 
[ 47.467566][ C3] __kasan_slab_alloc (mm/kasan/common.c:322) 
[ 47.467733][ C3] __kmalloc (mm/slub.c:3799 mm/slub.c:3845 mm/slub.c:3965 mm/slub.c:3979) 
[ 47.467861][ C3] p9pdu_vreadf (./include/linux/slab.h:632 net/9p/protocol.c:313) 
[ 47.468125][ C3] ? trace_9p_client_res (./include/trace/events/9p.h:146 (discriminator 52)) 
[ 47.468290][ C3] ? p9_client_rpc (net/9p/client.c:755) 
[ 47.468453][ C3] ? __pfx_p9pdu_vreadf (net/9p/protocol.c:260) 
[ 47.468620][ C3] ? __pfx_p9_client_rpc (net/9p/client.c:672) 
[ 47.468787][ C3] p9pdu_readf (net/9p/protocol.c:696) 
[ 47.468917][ C3] ? __pfx_p9pdu_readf (net/9p/protocol.c:696) 
[ 47.469080][ C3] ? __pfx_v9fs_fid_find (fs/9p/fid.c:114) 
[ 47.469246][ C3] ? _raw_spin_unlock (./arch/x86/include/asm/preempt.h:94 ./include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) 
[ 47.469410][ C3] ? v9fs_fid_add (fs/9p/fid.c:41) 
[ 47.469668][ C3] p9_client_readlink (net/9p/client.c:2242) 
[ 47.469834][ C3] v9fs_vfs_get_link_dotl (fs/9p/vfs_inode_dotl.c:822 fs/9p/vfs_inode_dotl.c:806) 
[ 47.469998][ C3] ? __pfx_v9fs_vfs_get_link_dotl (fs/9p/vfs_inode_dotl.c:809) 
[ 47.470207][ C3] ? __lookup_slow (fs/namei.c:1692) 
[ 47.470464][ C3] pick_link (fs/namei.c:1808) 
[ 47.470588][ C3] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 47.470752][ C3] step_into (fs/namei.c:1874) 
[ 47.470878][ C3] ? __up_read (./arch/x86/include/asm/atomic64_64.h:79 ./include/linux/atomic/atomic-arch-fallback.h:2749 ./include/linux/atomic/atomic-long.h:184 ./include/linux/atomic/atomic-instrumented.h:3317 kernel/locking/rwsem.c:1347) 
[ 47.471134][ C3] ? __pfx_step_into (fs/namei.c:1839) 
[ 47.471298][ C3] ? walk_component (fs/namei.c:2005) 
[ 47.471466][ C3] link_path_walk.part.0.constprop.0 (fs/namei.c:2331) 
[ 47.471673][ C3] ? __pfx_link_path_walk.part.0.constprop.0 (fs/namei.c:2249) 
[ 47.471974][ C3] path_openat (fs/namei.c:3795) 
[ 47.472141][ C3] ? __pfx_path_openat (fs/namei.c:3781) 
[ 47.472306][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 47.472471][ C3] do_filp_open (fs/namei.c:3826) 
[ 47.472728][ C3] ? __pfx_do_filp_open (fs/namei.c:3820) 
[ 47.472892][ C3] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 47.473059][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 47.473223][ C3] ? alloc_fd (fs/file.c:555 (discriminator 10)) 
[ 47.473352][ C3] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 47.473699][ C3] ? _raw_spin_unlock (./arch/x86/include/asm/preempt.h:94 ./include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) 
[ 47.473864][ C3] ? alloc_fd (fs/file.c:555 (discriminator 10)) 
[ 47.473991][ C3] do_sys_openat2 (fs/open.c:1406) 
[ 47.474154][ C3] ? vfs_fstatat (fs/stat.c:308) 
[ 47.474408][ C3] ? __pfx_do_sys_openat2 (fs/open.c:1392) 
[ 47.474572][ C3] ? __pfx___do_sys_newfstatat (fs/stat.c:464) 
[ 47.474737][ C3] __x64_sys_openat (fs/open.c:1432) 
[ 47.474902][ C3] ? __pfx___x64_sys_openat (fs/open.c:1432) 
[ 47.475065][ C3] ? __pfx_do_faccessat (fs/open.c:465) 
[ 47.475322][ C3] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 47.475489][ C3] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   47.475692][    C3] RIP: 0033:0x7f31c1aa60e8
[ 47.475860][ C3] 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
[   47.476543][    C3] RSP: 002b:00007ffde70d8258 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
[   47.476794][    C3] RAX: ffffffffffffffda RBX: 00007ffde70d84ef RCX: 00007f31c1aa60e8
[   47.477040][    C3] RDX: 0000000000080000 RSI: 00007ffde70d82d0 RDI: 00000000ffffff9c
[   47.477283][    C3] RBP: 00007ffde70d82c0 R08: 0000000000080000 R09: 00007ffde70d82d0
[   47.477623][    C3] R10: 0000000000000000 R11: 0000000000000287 R12: 00007ffde70d82d7


Finger prints:
dump_stack_lvl:mark_lock_irq:mark_lock:mark_usage