======================================
| [ 30.559299][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   30.559497][    C2]
| [   30.559577][    C2]
| [   30.559577][    C2] stack backtrace:
[   30.560116][    C2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   30.560577][    C2] Call Trace:
[   30.560706][    C2]  <IRQ>
[ 30.560788][ C2] dump_stack_lvl (lib/dump_stack.c:117) 
[ 30.560951][ C2] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 30.561150][ C2] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 30.561419][ C2] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 30.561616][ C2] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 30.561779][ C2] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 30.561937][ C2] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 30.562204][ C2] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 30.562365][ C2] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 30.562524][ C2] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 30.562686][ C2] ? save_trace (kernel/locking/lockdep.c:586) 
[ 30.562952][ C2] mark_lock (kernel/locking/lockdep.c:4678) 
[ 30.563072][ C2] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 30.563239][ C2] mark_usage (kernel/locking/lockdep.c:4567) 
[ 30.563364][ C2] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 30.563528][ C2] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 30.563793][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 30.563954][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 30.564114][ C2] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 30.564275][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 30.564541][ C2] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 30.564704][ C2] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 30.564862][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 30.565022][ C2] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 30.565288][ C2] _raw_write_lock (./include/linux/rwlock_api_smp.h:210 kernel/locking/spinlock.c:300) 
[ 30.565447][ C2] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 30.565607][ C2] addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 30.565766][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 30.565927][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 30.566191][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 30.566353][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 30.566513][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 30.566673][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 30.566940][ C2] call_timer_fn (kernel/time/timer.c:1793) 
[ 30.567100][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 30.567259][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 30.567420][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 30.567787][ 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) 
[ 30.567951][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 30.568114][ C2] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 30.568275][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 30.568543][ C2] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 30.568703][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 30.568865][ 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) 
[ 30.569025][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 30.569185][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 30.569449][ C2] ? timer_expire_remote (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2181) 
[ 30.569616][ C2] timer_expire_remote (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2181) 
[ 30.569775][ C2] tmigr_handle_remote_cpu (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:67 ./arch/x86/include/asm/irqflags.h:127 kernel/time/timer_migration.c:925) 
[ 30.569935][ C2] ? __pfx_tmigr_handle_remote_cpu (kernel/time/timer_migration.c:869) 
[ 30.570237][ 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) 
[ 30.570397][ C2] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 30.570519][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 30.570681][ C2] tmigr_handle_remote_up (kernel/time/timer_migration.c:1003) 
[ 30.570947][ C2] tmigr_handle_remote (kernel/time/timer_migration.c:488 kernel/time/timer_migration.c:1061) 
[ 30.571111][ C2] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1026) 
[ 30.571271][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 30.571433][ C2] __do_softirq (kernel/softirq.c:554) 
[ 30.571700][ C2] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 30.571826][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   30.571987][    C2]  </IRQ>
[   30.572070][    C2]  <TASK>
[ 30.572150][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 30.572349][ C2] RIP: 0010:kasan_report (mm/kasan/report.c:579) 
[ 30.572628][ C2] Code: c4 68 5b 5d 41 5c c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 41 57 <41> 56 41 55 41 54 55 53 48 83 ec 70 9c 8f 04 24 0f 01 ca 65 4c 8b
All code
========
   0:	c4                   	(bad)
   1:	68 5b 5d 41 5c       	push   $0x5c415d5b
   6:	c3                   	ret
   7:	cc                   	int3
   8:	cc                   	int3
   9:	cc                   	int3
   a:	cc                   	int3
   b:	66 0f 1f 84 00 00 00 	nopw   0x0(%rax,%rax,1)
  12:	00 00 
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  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:	66 0f 1f 00          	nopw   (%rax)
  28:	41 57                	push   %r15
  2a:*	41 56                	push   %r14		<-- trapping instruction
  2c:	41 55                	push   %r13
  2e:	41 54                	push   %r12
  30:	55                   	push   %rbp
  31:	53                   	push   %rbx
  32:	48 83 ec 70          	sub    $0x70,%rsp
  36:	9c                   	pushf
  37:	8f 04 24             	pop    (%rsp)
  3a:	0f 01 ca             	clac
  3d:	65                   	gs
  3e:	4c                   	rex.WR
  3f:	8b                   	.byte 0x8b

Code starting with the faulting instruction
===========================================
   0:	41 56                	push   %r14
   2:	41 55                	push   %r13
   4:	41 54                	push   %r12
   6:	55                   	push   %rbp
   7:	53                   	push   %rbx
   8:	48 83 ec 70          	sub    $0x70,%rsp
   c:	9c                   	pushf
   d:	8f 04 24             	pop    (%rsp)
  10:	0f 01 ca             	clac
  13:	65                   	gs
  14:	4c                   	rex.WR
  15:	8b                   	.byte 0x8b
[   30.573307][    C2] RSP: 0018:ffffc90000e9f420 EFLAGS: 00000246
[   30.573514][    C2] RAX: ffff8880061e8000 RBX: ffff8880061e6c98 RCX: ffffffffa3a58784
[   30.573753][    C2] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880061e6c98
[   30.574103][    C2] RBP: 0000000000002000 R08: 0000000000000001 R09: fffffbfff4dc32a9
[   30.574342][    C2] R10: ffffffffa6e1954f R11: 0000000000001000 R12: 5a5a5a5a5a5a5a5a
[   30.574581][    C2] R13: 000000000000005a R14: dffffc0000000000 R15: ffff8880061e6000
[ 30.574931][ C2] ? memchr_inv (lib/string.c:856) 
[ 30.575092][ C2] memchr_inv (lib/string.c:856) 
[ 30.575217][ C2] slab_pad_check.part.0 (mm/slub.c:1281) 
[ 30.575380][ C2] free_slab (mm/slub.c:242 mm/slub.c:2423) 
[ 30.575502][ C2] qlist_free_all (mm/kasan/quarantine.c:174) 
[ 30.575768][ C2] kasan_quarantine_reduce (./include/linux/srcu.h:285 mm/kasan/quarantine.c:287) 
[ 30.575929][ C2] __kasan_slab_alloc (mm/kasan/common.c:322) 
[ 30.576092][ C2] kmem_cache_alloc (./include/linux/kasan.h:201 mm/slub.c:3798 mm/slub.c:3845 mm/slub.c:3852) 
[ 30.576253][ C2] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 30.576516][ C2] p9_tag_alloc (net/9p/client.c:285) 
[ 30.576678][ C2] ? __pfx_p9_tag_alloc (net/9p/client.c:277) 
[ 30.576842][ 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) 
[ 30.577001][ C2] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 30.577266][ 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) 
[ 30.577426][ C2] p9_client_prepare_req (net/9p/client.c:641) 
[ 30.577585][ 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) 
[ 30.577744][ C2] ? __pfx_p9_client_prepare_req (net/9p/client.c:625) 
[ 30.578046][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 30.578207][ C2] p9_client_rpc (net/9p/client.c:688 (discriminator 4)) 
[ 30.578371][ C2] ? __pfx_p9_client_rpc (net/9p/client.c:672) 
[ 30.578533][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 30.578693][ C2] ? list_lru_add (mm/list_lru.c:106) 
[ 30.578958][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 30.579120][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 30.579281][ C2] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 30.579440][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 30.579707][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 30.579872][ C2] p9_client_clunk (net/9p/client.c:1438 (discriminator 3)) 
[ 30.580034][ C2] v9fs_dentry_release (fs/9p/vfs_dentry.c:54) 
[ 30.580196][ C2] __dentry_kill (fs/dcache.c:608) 
[ 30.580562][ C2] ? __pfx_kfree_link (fs/libfs.c:1573) 
[ 30.580723][ C2] dput.part.0 (fs/dcache.c:845) 
[ 30.580882][ C2] walk_component (fs/namei.c:562 fs/namei.c:1027 fs/namei.c:2009) 
[ 30.581043][ C2] link_path_walk.part.0.constprop.0 (fs/namei.c:2328) 
[ 30.581348][ C2] ? __pfx_link_path_walk.part.0.constprop.0 (fs/namei.c:2249) 
[ 30.581547][ C2] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 30.581711][ 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) 
[ 30.581871][ C2] path_lookupat (fs/namei.c:2254 (discriminator 2) fs/namei.c:2484 (discriminator 2)) 
[ 30.582135][ C2] filename_lookup (fs/namei.c:2514) 
[ 30.582296][ C2] ? __pfx_filename_lookup (fs/namei.c:2508) 
[ 30.582458][ C2] ? __pfx_kfree_link (fs/libfs.c:1573) 
[ 30.582617][ C2] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 30.582881][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 30.583043][ C2] ? __might_fault (mm/memory.c:6216 mm/memory.c:6209) 
[ 30.583203][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 30.583382][ C2] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 30.583544][ C2] vfs_statx (fs/stat.c:244) 
[ 30.583772][ C2] ? __pfx_vfs_statx (fs/stat.c:234) 
[ 30.583932][ 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) 
[ 30.584094][ C2] vfs_fstatat (fs/stat.c:305) 
[ 30.584215][ C2] __do_sys_newfstatat (fs/stat.c:469) 
[ 30.584477][ C2] ? __pfx___do_sys_newfstatat (fs/stat.c:464) 
[ 30.584638][ C2] ? __x64_sys_openat (fs/open.c:1432) 
[ 30.584802][ C2] ? __pfx___x64_sys_openat (fs/open.c:1432) 
[ 30.584962][ C2] ? __pfx_do_faccessat (fs/open.c:465) 
[ 30.585124][ C2] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 30.585429][ C2] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 30.585588][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   30.585786][    C2] RIP: 0033:0x7f80dca3ceae
[ 30.586056][ 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
[   30.586622][    C2] RSP: 002b:00007ffedfe89518 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
[   30.586972][    C2] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f80dca3ceae
[   30.587211][    C2] RDX: 00007ffedfe895e0 RSI: 00007ffedfe89520 RDI: 00000000ffffff9c
[   30.587450][    C2] RBP: 00007ffedfe896a0 R08: 00000000ffffffff R09: 00007ffedfe89520
[   30.587797][    C2] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffedfe89527


Finger prints:
dump_stack_lvl:mark_lock_irq:mark_lock:mark_usage