======================================
| [ 46.450824][ C3] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   46.451017][    C3]
| [   46.451100][    C3]
| [   46.451100][    C3] stack backtrace:
[   46.451714][    C3] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   46.452159][    C3] Call Trace:
[   46.452276][    C3]  <IRQ>
[ 46.452359][ C3] dump_stack_lvl (lib/dump_stack.c:117) 
[ 46.452515][ C3] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 46.452725][ C3] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 46.453030][ C3] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 46.453183][ C3] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 46.453336][ C3] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 46.453492][ C3] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 46.453649][ C3] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 46.453804][ C3] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 46.453967][ C3] ? add_chain_cache (kernel/locking/lockdep.c:3730) 
[ 46.454126][ C3] ? save_trace (kernel/locking/lockdep.c:586) 
[ 46.454280][ C3] mark_lock (kernel/locking/lockdep.c:4678) 
[ 46.454399][ C3] mark_usage (kernel/locking/lockdep.c:4567) 
[ 46.454517][ C3] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 46.454674][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 46.454828][ C3] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 46.455193][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 46.455348][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 46.455582][ C3] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 46.455839][ C3] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 46.455997][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 46.456227][ C3] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 46.456381][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 46.456621][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 46.456791][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 46.457028][ C3] br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 46.457260][ C3] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 46.457531][ C3] call_timer_fn (kernel/time/timer.c:1793) 
[ 46.457688][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 46.457841][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 46.457996][ C3] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 46.458245][ 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) 
[ 46.458401][ C3] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 46.458560][ C3] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 46.458714][ C3] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 46.459093][ C3] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 46.459248][ 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) 
[ 46.459402][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 46.459555][ C3] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 46.459708][ C3] ? run_timer_softirq (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 46.459863][ C3] run_timer_softirq (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 46.460022][ C3] __do_softirq (kernel/softirq.c:554) 
[ 46.460179][ C3] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 46.460298][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   46.460452][    C3]  </IRQ>
[   46.460536][    C3]  <TASK>
[ 46.460615][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 46.460825][ C3] RIP: 0010:_raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 46.461128][ C3] Code: 10 e8 11 39 9b fd 48 89 ef e8 49 a9 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 f5 ae 4f 5f <74> 0e 5b 5d c3 cc cc cc cc e8 3f a3 be fd eb dc 0f 1f 44 00 00 5b
All code
========
   0:	10 e8                	adc    %ch,%al
   2:	11 39                	adc    %edi,(%rcx)
   4:	9b                   	fwait
   5:	fd                   	std
   6:	48 89 ef             	mov    %rbp,%rdi
   9:	e8 49 a9 9b fd       	call   0xfffffffffd9ba957
   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 ae 4f 5f 	decl   %gs:0x5f4faef5(%rip)        # 0x5f4faf1f
  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 3f a3 be fd       	call   0xfffffffffdbea377
  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 3f a3 be fd       	call   0xfffffffffdbea34d
   e:	eb dc                	jmp    0xffffffffffffffec
  10:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  15:	5b                   	pop    %rbx
[   46.461687][    C3] RSP: 0018:ffffc90000ccf888 EFLAGS: 00000286
[   46.462002][    C3] RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff47a5d55
[   46.462238][    C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffa0b41921
[   46.462472][    C3] RBP: ffff888001041080 R08: 0000000000000001 R09: fffffbfff47a3ca9
[   46.462709][    C3] R10: ffffffffa3d1e54f R11: 0000000000001000 R12: ffff888007887a00
[   46.462944][    C3] R13: 0000000000000000 R14: ffffc90000ccf8d8 R15: ffff888008d19000
[ 46.463275][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 46.463473][ C3] qlist_free_all (mm/kasan/quarantine.c:174) 
[ 46.463629][ C3] kasan_quarantine_reduce (./include/linux/srcu.h:285 mm/kasan/quarantine.c:287) 
[ 46.463788][ C3] __kasan_slab_alloc (mm/kasan/common.c:322) 
[ 46.464047][ C3] kmem_cache_alloc (./include/linux/kasan.h:201 mm/slub.c:3798 mm/slub.c:3845 mm/slub.c:3852) 
[ 46.464205][ C3] ? is_bpf_text_address (kernel/bpf/core.c:772) 
[ 46.464362][ C3] p9_tag_alloc (net/9p/client.c:285) 
[ 46.464518][ C3] ? __pfx_p9_tag_alloc (net/9p/client.c:277) 
[ 46.464680][ C3] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 46.464943][ 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) 
[ 46.465097][ C3] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 46.465215][ C3] p9_client_prepare_req (net/9p/client.c:641) 
[ 46.465372][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 46.465527][ C3] ? __pfx_p9_client_prepare_req (net/9p/client.c:625) 
[ 46.465720][ C3] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 46.465873][ 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) 
[ 46.466025][ C3] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 46.466144][ C3] p9_client_rpc (net/9p/client.c:688 (discriminator 4)) 
[ 46.466300][ C3] ? __pfx_p9_client_rpc (net/9p/client.c:672) 
[ 46.466454][ C3] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 46.466610][ C3] ? v9fs_dir_release (./include/net/9p/client.h:269 fs/9p/vfs_dir.c:224) 
[ 46.466774][ C3] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 46.467129][ C3] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 46.467283][ 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) 
[ 46.467437][ C3] p9_client_clunk (net/9p/client.c:1438 (discriminator 3)) 
[ 46.467590][ C3] v9fs_dir_release (./include/net/9p/client.h:278 fs/9p/vfs_dir.c:224) 
[ 46.467746][ C3] __fput (fs/file_table.c:422) 
[ 46.467866][ C3] task_work_run (kernel/task_work.c:180 (discriminator 1)) 
[ 46.468021][ C3] ? __pfx_task_work_run (kernel/task_work.c:148) 
[ 46.468176][ C3] ? switch_task_namespaces (kernel/nsproxy.c:250) 
[ 46.468332][ 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) 
[ 46.468487][ C3] do_exit (kernel/exit.c:879) 
[ 46.468603][ 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) 
[ 46.468771][ C3] ? __pfx_do_exit (kernel/exit.c:819) 
[ 46.468933][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 46.469091][ C3] do_group_exit (kernel/exit.c:1008) 
[ 46.469249][ C3] __x64_sys_exit_group (kernel/exit.c:1036) 
[ 46.469407][ C3] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 46.469563][ C3] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   46.469758][    C3] RIP: 0033:0x7fc2df975a8d
[ 46.469917][ C3] Code: Unable to access opcode bytes at 0x7fc2df975a63.

Code starting with the faulting instruction
===========================================
[   46.470116][    C3] RSP: 002b:00007fff01263d58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   46.470351][    C3] RAX: ffffffffffffffda RBX: 00007fc2dfa529c0 RCX: 00007fc2df975a8d
[   46.470581][    C3] RDX: 00000000000000e7 RSI: fffffffffffffe98 RDI: 0000000000000000
[   46.470826][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000048
[   46.471061][    C3] R10: 00007fff01263ba0 R11: 0000000000000246 R12: 00007fc2dfa529c0


Finger prints:
dump_stack_lvl:mark_lock_irq:mark_lock:mark_usage