======================================
| [ 42.842745][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   42.842969][    C2]
| [   42.843058][    C2]
| [   42.843058][    C2] stack backtrace:
[   42.843638][    C2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   42.844242][    C2] Call Trace:
[   42.844371][    C2]  <IRQ>
[ 42.844473][ C2] dump_stack_lvl (lib/dump_stack.c:117) 
[ 42.844652][ C2] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 42.844883][ C2] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 42.845218][ C2] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 42.845385][ C2] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 42.845544][ C2] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 42.845707][ C2] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 42.845970][ C2] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 42.846128][ C2] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 42.846287][ C2] ? add_chain_cache (kernel/locking/lockdep.c:3730) 
[ 42.846447][ C2] ? save_trace (kernel/locking/lockdep.c:586) 
[ 42.846707][ C2] mark_lock (kernel/locking/lockdep.c:4678) 
[ 42.846827][ C2] mark_usage (kernel/locking/lockdep.c:4567) 
[ 42.846948][ C2] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 42.847107][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 42.847267][ C2] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) 
[ 42.847568][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 42.847727][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 42.847925][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 42.848083][ C2] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 42.848242][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 42.848437][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 42.848598][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 42.848822][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 42.849101][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 42.849310][ C2] br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 42.849530][ C2] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) 
[ 42.849871][ C2] call_timer_fn (kernel/time/timer.c:1793) 
[ 42.850059][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 42.850218][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 42.850379][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 42.850657][ 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) 
[ 42.850840][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 42.851010][ C2] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 42.851187][ C2] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) 
[ 42.851514][ C2] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 42.851684][ 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) 
[ 42.851865][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 42.852047][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 42.852206][ C2] ? run_timer_softirq (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 42.852365][ C2] run_timer_softirq (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 42.852522][ C2] __do_softirq (kernel/softirq.c:554) 
[ 42.852681][ C2] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 42.852800][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   42.853069][    C2]  </IRQ>
[   42.853151][    C2]  <TASK>
[ 42.853234][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 42.853433][ C2] RIP: 0010:__orc_find (arch/x86/kernel/unwind_orc.c:80 arch/x86/kernel/unwind_orc.c:102) 
[ 42.853600][ C2] Code: e5 77 4e 4c 89 e2 48 29 ea 48 89 d6 48 c1 ea 3f 48 c1 fe 02 48 01 f2 48 d1 fa 48 8d 5c 95 00 48 89 da 48 c1 ea 03 0f b6 34 0a <48> 89 da 83 e2 07 83 c2 03 40 38 f2 7c 05 40 84 f6 75 4b 48 63 13
All code
========
   0:	e5 77                	in     $0x77,%eax
   2:	4e                   	rex.WRX
   3:	4c 89 e2             	mov    %r12,%rdx
   6:	48 29 ea             	sub    %rbp,%rdx
   9:	48 89 d6             	mov    %rdx,%rsi
   c:	48 c1 ea 3f          	shr    $0x3f,%rdx
  10:	48 c1 fe 02          	sar    $0x2,%rsi
  14:	48 01 f2             	add    %rsi,%rdx
  17:	48 d1 fa             	sar    %rdx
  1a:	48 8d 5c 95 00       	lea    0x0(%rbp,%rdx,4),%rbx
  1f:	48 89 da             	mov    %rbx,%rdx
  22:	48 c1 ea 03          	shr    $0x3,%rdx
  26:	0f b6 34 0a          	movzbl (%rdx,%rcx,1),%esi
  2a:*	48 89 da             	mov    %rbx,%rdx		<-- trapping instruction
  2d:	83 e2 07             	and    $0x7,%edx
  30:	83 c2 03             	add    $0x3,%edx
  33:	40 38 f2             	cmp    %sil,%dl
  36:	7c 05                	jl     0x3d
  38:	40 84 f6             	test   %sil,%sil
  3b:	75 4b                	jne    0x88
  3d:	48 63 13             	movslq (%rbx),%rdx

Code starting with the faulting instruction
===========================================
   0:	48 89 da             	mov    %rbx,%rdx
   3:	83 e2 07             	and    $0x7,%edx
   6:	83 c2 03             	add    $0x3,%edx
   9:	40 38 f2             	cmp    %sil,%dl
   c:	7c 05                	jl     0x13
   e:	40 84 f6             	test   %sil,%sil
  11:	75 4b                	jne    0x5e
  13:	48 63 13             	movslq (%rbx),%rdx
[   42.854266][    C2] RSP: 0018:ffffc90000d0ed88 EFLAGS: 00000a02
[   42.854471][    C2] RAX: ffffffff8f526d28 RBX: ffffffff8f0ab398 RCX: dffffc0000000000
[   42.854816][    C2] RDX: 1ffffffff1e15673 RSI: 0000000000000000 RDI: ffffffff8f0ab38c
[   42.855052][    C2] RBP: ffffffff8f0ab38c R08: ffffc90000d0ef08 R09: 1ffff920001a1dc2
[   42.855394][    C2] R10: ffffc90000d0eec8 R11: ffffc90000d0ef09 R12: ffffffff8f0ab3a8
[   42.855628][    C2] R13: ffffffff8cf6655c R14: ffffffff8f0ab38c R15: ffffffff8f0ab38c
[ 42.855864][ C2] ? p9_fcall_init (./include/linux/slab.h:632 net/9p/client.c:232) 
[ 42.856026][ C2] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 42.856291][ C2] unwind_next_frame (arch/x86/kernel/unwind_orc.c:495) 
[ 42.856448][ C2] ? p9_fcall_init (net/9p/client.c:232) 
[ 42.856630][ C2] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 42.856800][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 42.857228][ C2] ? p9_fcall_init (net/9p/client.c:232) 
[ 42.857397][ C2] ? kernel_text_address (kernel/extable.c:99) 
[ 42.857561][ C2] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 42.857792][ C2] arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 42.858060][ C2] ? p9_fcall_init (net/9p/client.c:232) 
[ 42.858218][ C2] stack_trace_save (kernel/stacktrace.c:123) 
[ 42.858376][ C2] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 42.858535][ C2] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 42.858796][ C2] kasan_save_stack (mm/kasan/common.c:48) 
[ 42.858953][ C2] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 42.859112][ C2] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 42.859269][ C2] ? __kasan_slab_alloc (mm/kasan/common.c:341) 
[ 42.859532][ C2] ? kmem_cache_alloc (./include/linux/kasan.h:201 mm/slub.c:3798 mm/slub.c:3845 mm/slub.c:3852) 
[ 42.859693][ C2] ? __alloc_object (mm/kmemleak.c:466 mm/kmemleak.c:645) 
[ 42.859855][ C2] ? __create_object (mm/kmemleak.c:750) 
[ 42.860013][ C2] ? __kmalloc (./include/linux/kmemleak.h:42 mm/slub.c:3802 mm/slub.c:3845 mm/slub.c:3965 mm/slub.c:3979) 
[ 42.860185][ C2] ? p9_fcall_init (net/9p/client.c:232) 
[ 42.860359][ 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) 
[ 42.860545][ C2] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 42.860684][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 42.860844][ C2] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 42.861176][ C2] ? get_partial_node.part.0 (mm/slub.c:2623) 
[ 42.861354][ C2] ? ___slab_alloc (mm/slub.c:2583 mm/slub.c:2701 mm/slub.c:3505) 
[ 42.861543][ C2] ? fs_reclaim_acquire (mm/page_alloc.c:3715 mm/page_alloc.c:3706) 
[ 42.861711][ C2] ? __alloc_object (mm/kmemleak.c:466 mm/kmemleak.c:645) 
[ 42.861975][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 42.862146][ C2] kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 42.862319][ C2] __kasan_slab_alloc (mm/kasan/common.c:341) 
[ 42.862491][ C2] kmem_cache_alloc (./include/linux/kasan.h:201 mm/slub.c:3798 mm/slub.c:3845 mm/slub.c:3852) 
[ 42.862777][ C2] ? p9_fcall_init (net/9p/client.c:232) 
[ 42.862951][ C2] __alloc_object (mm/kmemleak.c:466 mm/kmemleak.c:645) 
[ 42.863133][ C2] ? p9_fcall_init (net/9p/client.c:232) 
[ 42.863290][ C2] __create_object (mm/kmemleak.c:750) 
[ 42.863454][ C2] ? p9_fcall_init (net/9p/client.c:232) 
[ 42.863745][ C2] __kmalloc (./include/linux/kmemleak.h:42 mm/slub.c:3802 mm/slub.c:3845 mm/slub.c:3965 mm/slub.c:3979) 
[ 42.863868][ C2] p9_fcall_init (net/9p/client.c:232) 
[ 42.864055][ C2] p9_tag_alloc (net/9p/client.c:297) 
[ 42.864214][ C2] ? __pfx_p9_tag_alloc (net/9p/client.c:277) 
[ 42.864504][ C2] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 42.864680][ 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) 
[ 42.864848][ C2] p9_client_prepare_req (net/9p/client.c:641) 
[ 42.865029][ 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) 
[ 42.865199][ C2] ? __pfx_p9_client_prepare_req (net/9p/client.c:625) 
[ 42.865397][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 42.865556][ C2] p9_client_rpc (net/9p/client.c:688 (discriminator 4)) 
[ 42.865714][ C2] ? __pfx_p9_client_rpc (net/9p/client.c:672) 
[ 42.865978][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 42.866136][ C2] ? p9_fid_create (./include/linux/local_lock_internal.h:38 ./include/linux/idr.h:174 net/9p/client.c:867) 
[ 42.866296][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 42.866456][ 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) 
[ 42.866615][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 42.866880][ C2] ? p9_fid_create (./include/linux/local_lock_internal.h:38 ./include/linux/idr.h:174 net/9p/client.c:867) 
[ 42.867039][ C2] p9_client_walk (net/9p/client.c:1169) 
[ 42.867197][ C2] ? __pfx_p9_client_walk (net/9p/client.c:1143) 
[ 42.867357][ C2] ? d_alloc_parallel (./arch/x86/include/asm/bitops.h:94 ./arch/x86/include/asm/bitops.h:112 ./include/asm-generic/bitops/instrumented-lock.h:43 ./include/linux/bit_spinlock.h:80 ./include/linux/list_bl.h:153 fs/dcache.c:2556) 
[ 42.867622][ C2] ? v9fs_fid_lookup_with_uid (fs/9p/fid.c:181) 
[ 42.867785][ C2] ? v9fs_vfs_lookup.part.0 (fs/9p/vfs_inode.c:676) 
[ 42.867943][ C2] v9fs_vfs_lookup.part.0 (fs/9p/vfs_inode.c:676) 
[ 42.868103][ C2] ? __pfx_v9fs_vfs_lookup.part.0 (fs/9p/vfs_inode.c:649) 
[ 42.868303][ C2] ? lockdep_init_map_type (kernel/locking/lockdep.c:4892) 
[ 42.868463][ C2] __lookup_slow (fs/namei.c:1692) 
[ 42.868622][ C2] ? __pfx___lookup_slow (fs/namei.c:1668) 
[ 42.868781][ C2] ? walk_component (fs/namei.c:1709 fs/namei.c:2004) 
[ 42.869045][ C2] walk_component (./include/linux/fs.h:808 fs/namei.c:1710 fs/namei.c:2004) 
[ 42.869207][ C2] link_path_walk.part.0.constprop.0 (fs/namei.c:2331) 
[ 42.869406][ C2] ? __pfx_link_path_walk.part.0.constprop.0 (fs/namei.c:2249) 
[ 42.869604][ C2] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 42.869969][ 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) 
[ 42.870128][ C2] path_lookupat (fs/namei.c:2254 (discriminator 2) fs/namei.c:2484 (discriminator 2)) 
[ 42.870287][ C2] filename_lookup (fs/namei.c:2514) 
[ 42.870446][ C2] ? __pfx_filename_lookup (fs/namei.c:2508) 
[ 42.870711][ C2] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 42.870871][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 42.871029][ C2] ? __might_fault (mm/memory.c:6216 mm/memory.c:6209) 
[ 42.871188][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 42.871449][ C2] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 42.871609][ C2] vfs_statx (fs/stat.c:244) 
[ 42.871729][ C2] ? __pfx_vfs_statx (fs/stat.c:234) 
[ 42.871888][ C2] ? getname_flags (./arch/x86/include/asm/atomic.h:28 ./include/linux/atomic/atomic-arch-fallback.h:503 ./include/linux/atomic/atomic-instrumented.h:68 fs/namei.c:190) 
[ 42.872048][ C2] vfs_fstatat (fs/stat.c:305) 
[ 42.872171][ C2] __do_sys_newfstatat (fs/stat.c:469) 
[ 42.872329][ C2] ? __pfx___do_sys_newfstatat (fs/stat.c:464) 
[ 42.872491][ C2] ? __x64_sys_openat (fs/open.c:1432) 
[ 42.872649][ C2] ? __pfx___x64_sys_openat (fs/open.c:1432) 
[ 42.872910][ C2] ? __pfx_do_faccessat (fs/open.c:465) 
[ 42.873079][ C2] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 42.873289][ C2] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 42.873476][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   42.873779][    C2] RIP: 0033:0x7f4df02e6eae
[ 42.873944][ C2] Code: 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 07 00 00 00 0f 1f 80 00 00 00 00 f3 0f 1e fa 41 89 ca b8 06 01 00 00 0f 05 <3d> 00 f0 ff ff 77 0b 31 c0 c3 0f 1f 84 00 00 00 00 00 f7 d8 89 05
All code
========
   0:	48 89 f2             	mov    %rsi,%rdx
   3:	b9 00 01 00 00       	mov    $0x100,%ecx
   8:	48 89 fe             	mov    %rdi,%rsi
   b:	bf 9c ff ff ff       	mov    $0xffffff9c,%edi
  10:	e9 07 00 00 00       	jmp    0x1c
  15:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  1c:	f3 0f 1e fa          	endbr64
  20:	41 89 ca             	mov    %ecx,%r10d
  23:	b8 06 01 00 00       	mov    $0x106,%eax
  28:	0f 05                	syscall
  2a:*	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax		<-- trapping instruction
  2f:	77 0b                	ja     0x3c
  31:	31 c0                	xor    %eax,%eax
  33:	c3                   	ret
  34:	0f 1f 84 00 00 00 00 	nopl   0x0(%rax,%rax,1)
  3b:	00 
  3c:	f7 d8                	neg    %eax
  3e:	89                   	.byte 0x89
  3f:	05                   	.byte 0x5

Code starting with the faulting instruction
===========================================
   0:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   5:	77 0b                	ja     0x12
   7:	31 c0                	xor    %eax,%eax
   9:	c3                   	ret
   a:	0f 1f 84 00 00 00 00 	nopl   0x0(%rax,%rax,1)
  11:	00 
  12:	f7 d8                	neg    %eax
  14:	89                   	.byte 0x89
  15:	05                   	.byte 0x5
[   42.874609][    C2] RSP: 002b:00007fffa116dee8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
[   42.874850][    C2] RAX: ffffffffffffffda RBX: 000000000000000c RCX: 00007f4df02e6eae
[   42.875088][    C2] RDX: 00007fffa116dfc0 RSI: 00007fffa116def0 RDI: 00000000ffffff9c
[   42.875324][    C2] RBP: 00007fffa116e080 R08: 00000000ffffffff R09: 00007fffa116def0
[   42.875560][    C2] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffa116def7


Finger prints:
dump_stack_lvl:mark_lock_irq:mark_lock:mark_usage