======================================
| [ 49.082243][ C3] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   49.082458][    C3]
| [   49.082644][    C3]
| [   49.082644][    C3] stack backtrace:
[   49.083125][    C3] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   49.083611][    C3] Call Trace:
[   49.083756][    C3]  <IRQ>
[ 49.083846][ C3] dump_stack_lvl (lib/dump_stack.c:117) 
[ 49.084037][ C3] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 49.084391][ C3] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 49.084613][ C3] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 49.084787][ C3] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 49.084960][ C3] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 49.085144][ C3] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 49.085318][ C3] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 49.085495][ C3] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 49.085680][ C3] ? add_chain_cache (kernel/locking/lockdep.c:3730) 
[ 49.085860][ C3] ? save_trace (kernel/locking/lockdep.c:586) 
[ 49.086143][ C3] mark_lock (kernel/locking/lockdep.c:4678) 
[ 49.086288][ C3] mark_usage (kernel/locking/lockdep.c:4567) 
[ 49.086425][ C3] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 49.086600][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 49.086878][ C3] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) 
[ 49.087103][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 49.087277][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 49.087497][ C3] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 49.087775][ C3] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 49.087948][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 49.088191][ C3] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 49.088369][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 49.088691][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 49.088864][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 49.089108][ C3] br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) 
[ 49.089365][ C3] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) 
[ 49.089747][ C3] call_timer_fn (kernel/time/timer.c:1793) 
[ 49.090016][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 49.090275][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 49.090504][ C3] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 49.090958][ C3] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 49.091158][ C3] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 49.091447][ C3] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) 
[ 49.091793][ C3] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 49.092445][ 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) 
[ 49.092722][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 49.093004][ C3] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 49.093284][ C3] ? run_timer_softirq (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 49.093570][ C3] run_timer_softirq (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 49.093857][ C3] __do_softirq (kernel/softirq.c:554) 
[ 49.094148][ C3] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 49.094369][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   49.094651][    C3]  </IRQ>
[   49.094978][    C3]  <TASK>
[ 49.095125][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 49.095474][ C3] RIP: 0010:core_kernel_text (kernel/extable.c:67) 
[ 49.095776][ C3] Code: cc 48 89 ef e8 31 4d 1a 00 48 85 c0 75 ed 48 89 ef 5d e9 d3 f2 3a 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <66> 0f 1f 00 53 48 89 fb 48 83 ec 08 48 81 ff 00 00 40 8b 72 09 48
All code
========
   0:	cc                   	int3
   1:	48 89 ef             	mov    %rbp,%rdi
   4:	e8 31 4d 1a 00       	call   0x1a4d3a
   9:	48 85 c0             	test   %rax,%rax
   c:	75 ed                	jne    0xfffffffffffffffb
   e:	48 89 ef             	mov    %rbp,%rdi
  11:	5d                   	pop    %rbp
  12:	e9 d3 f2 3a 00       	jmp    0x3af2ea
  17:	0f 1f 00             	nopl   (%rax)
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	90                   	nop
  1e:	90                   	nop
  1f:	90                   	nop
  20:	90                   	nop
  21:	90                   	nop
  22:	90                   	nop
  23:	90                   	nop
  24:	90                   	nop
  25:	90                   	nop
  26:	90                   	nop
  27:	90                   	nop
  28:	90                   	nop
  29:	90                   	nop
  2a:*	66 0f 1f 00          	nopw   (%rax)		<-- trapping instruction
  2e:	53                   	push   %rbx
  2f:	48 89 fb             	mov    %rdi,%rbx
  32:	48 83 ec 08          	sub    $0x8,%rsp
  36:	48 81 ff 00 00 40 8b 	cmp    $0xffffffff8b400000,%rdi
  3d:	72 09                	jb     0x48
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	66 0f 1f 00          	nopw   (%rax)
   4:	53                   	push   %rbx
   5:	48 89 fb             	mov    %rdi,%rbx
   8:	48 83 ec 08          	sub    $0x8,%rsp
   c:	48 81 ff 00 00 40 8b 	cmp    $0xffffffff8b400000,%rdi
  13:	72 09                	jb     0x1e
  15:	48                   	rex.W
[   49.096932][    C3] RSP: 0018:ffffc9000098f360 EFLAGS: 00000292
[   49.097305][    C3] RAX: dffffc0000000000 RBX: ffffffff8bf8c2e4 RCX: 1ffffffff2044201
[   49.097734][    C3] RDX: 1ffff92000131e81 RSI: 0000000000000004 RDI: ffffffff8bf8c2e4
[   49.098155][    C3] RBP: ffffffff8bf8c2e4 R08: ffffc9000098f3f0 R09: fffff52000131e5f
[   49.098555][    C3] R10: ffffc9000098f3b0 R11: ffffc9000098f3f1 R12: ffffc9000098f478
[   49.099125][    C3] R13: 0000000000000000 R14: ffff888006198040 R15: 0000000000000000
[ 49.099484][ C3] ? __kasan_slab_free (mm/kasan/common.c:274) 
[ 49.099708][ C3] ? __kasan_slab_free (mm/kasan/common.c:274) 
[ 49.100127][ C3] ? __kasan_slab_free (mm/kasan/common.c:274) 
[ 49.100388][ C3] kernel_text_address (kernel/extable.c:99) 
[ 49.100567][ C3] ? __kasan_slab_free (mm/kasan/common.c:274) 
[ 49.100742][ C3] __kernel_text_address (kernel/extable.c:79) 
[ 49.101030][ C3] unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 49.101207][ C3] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 49.101424][ C3] arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 49.101599][ C3] ? __kasan_slab_free (mm/kasan/common.c:274) 
[ 49.101875][ C3] stack_trace_save (kernel/stacktrace.c:123) 
[ 49.102054][ C3] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 49.102229][ C3] kasan_save_stack (mm/kasan/common.c:48) 
[ 49.102405][ C3] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 49.102604][ C3] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 49.102880][ C3] ? kasan_save_free_info (mm/kasan/generic.c:582) 
[ 49.103059][ C3] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 49.103234][ C3] ? __debug_check_no_obj_freed (lib/debugobjects.c:1000) 
[ 49.103453][ C3] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 49.103727][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 49.103906][ C3] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 49.104182][ C3] ? __debug_check_no_obj_freed (lib/debugobjects.c:1000) 
[ 49.104504][ C3] ? __pfx___debug_check_no_obj_freed (lib/debugobjects.c:960) 
[ 49.104727][ C3] ? __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) 
[ 49.104905][ C3] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 49.105131][ C3] ? p9_req_put (net/9p/client.c:252 net/9p/client.c:404 net/9p/client.c:399) 
[ 49.105407][ C3] kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 49.105580][ C3] kasan_save_free_info (mm/kasan/generic.c:582) 
[ 49.105753][ C3] __kasan_slab_free (mm/kasan/common.c:274) 
[ 49.105935][ C3] kfree (mm/slub.c:4280 mm/slub.c:4390) 
[ 49.106083][ C3] ? p9_req_put (net/9p/client.c:252 net/9p/client.c:404 net/9p/client.c:399) 
[ 49.106381][ C3] p9_req_put (net/9p/client.c:252 net/9p/client.c:404 net/9p/client.c:399) 
[ 49.106516][ C3] p9_client_readlink (net/9p/client.c:2251) 
[ 49.106693][ C3] v9fs_vfs_get_link_dotl (fs/9p/vfs_inode_dotl.c:822 fs/9p/vfs_inode_dotl.c:806) 
[ 49.106878][ C3] ? __pfx_v9fs_vfs_get_link_dotl (fs/9p/vfs_inode_dotl.c:809) 
[ 49.107104][ C3] ? __lookup_slow (fs/namei.c:1692) 
[ 49.107313][ C3] pick_link (fs/namei.c:1808) 
[ 49.107456][ C3] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 49.107647][ C3] step_into (fs/namei.c:1874) 
[ 49.107787][ 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) 
[ 49.108085][ C3] ? __pfx_step_into (fs/namei.c:1839) 
[ 49.108269][ C3] ? walk_component (fs/namei.c:2005) 
[ 49.108469][ C3] link_path_walk.part.0.constprop.0 (fs/namei.c:2331) 
[ 49.108696][ C3] ? __pfx_link_path_walk.part.0.constprop.0 (fs/namei.c:2249) 
[ 49.109125][ C3] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 49.109303][ 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) 
[ 49.109483][ C3] path_lookupat (fs/namei.c:2254 (discriminator 2) fs/namei.c:2484 (discriminator 2)) 
[ 49.109659][ C3] filename_lookup (fs/namei.c:2514) 
[ 49.109937][ C3] ? __pfx_filename_lookup (fs/namei.c:2508) 
[ 49.110120][ C3] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 49.110291][ C3] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 49.110466][ C3] ? __might_fault (mm/memory.c:6216 mm/memory.c:6209) 
[ 49.110742][ C3] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 49.110916][ C3] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 49.111095][ C3] vfs_statx (fs/stat.c:244) 
[ 49.111227][ C3] ? __pfx_vfs_statx (fs/stat.c:234) 
[ 49.111503][ C3] ? 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) 
[ 49.111678][ C3] vfs_fstatat (fs/stat.c:305) 
[ 49.111811][ C3] __do_sys_newfstatat (fs/stat.c:469) 
[ 49.111997][ C3] ? __pfx___do_sys_newfstatat (fs/stat.c:464) 
[ 49.112174][ C3] ? __x64_sys_openat (fs/open.c:1432) 
[ 49.112455][ C3] ? __pfx___x64_sys_openat (fs/open.c:1432) 
[ 49.112630][ C3] ? __pfx_do_faccessat (fs/open.c:465) 
[ 49.112807][ C3] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 49.113033][ C3] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 49.113208][ C3] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   49.113471][    C3] RIP: 0033:0x7fdc8f90eeae
[ 49.113672][ C3] 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
[   49.114445][    C3] RSP: 002b:00007ffcc486ee08 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
[   49.114733][    C3] RAX: ffffffffffffffda RBX: 000000000000000e RCX: 00007fdc8f90eeae
[   49.115110][    C3] RDX: 00007ffcc486eed0 RSI: 00007ffcc486ee10 RDI: 00000000ffffff9c
[   49.115376][    C3] RBP: 00007ffcc486ef90 R08: 00000000ffffffff R09: 00007ffcc486ee10
[   49.115639][    C3] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcc486ee17


Finger prints:
dump_stack_lvl:mark_lock_irq:mark_lock:mark_usage