======================================
| [  154.826542][    C1]  #3: ffffffffab577d20 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame (./include/linux/rcupdate.h:300 (discriminator 2) ./include/linux/rcupdate.h:838 (discriminator 2) ./include/linux/rcupdate.h:1181 (discriminator 2) arch/x86/kernel/unwind_orc.c:495 (discriminator 2))
| [  154.826697][    C1]  #4: ffffffffab577c00 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:300 (discriminator 2) kernel/rcu/tree.c:2611 (discriminator 2))
| [  154.826854][    C1]
| [  154.826854][    C1] stack backtrace:
[  154.826968][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  154.826970][    C1] Workqueue: events virtio_fs_requests_done_work
[  154.826973][    C1] Call Trace:
[  154.826975][    C1]  <IRQ>
[  154.826976][    C1]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[  154.826982][    C1]  print_usage_bug.part.0.cold (kernel/locking/lockdep.c:4042)
[  154.826984][    C1]  ? filter_irq_stacks (kernel/stacktrace.c:402)
[  154.826987][    C1]  mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4056 kernel/locking/lockdep.c:4267)
[  154.826989][    C1]  ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1061 (discriminator 37) arch/x86/kernel/apic/apic.c:1061 (discriminator 37))
[  154.826991][    C1]  ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:697)
[  154.826993][    C1]  ? save_trace (kernel/locking/lockdep.c:589)
[  154.826995][    C1]  ? calculate_order (./include/asm-generic/getorder.h:41 mm/slub.c:7520)
[  154.826999][    C1]  mark_lock (kernel/locking/lockdep.c:4753)
[  154.827000][    C1]  mark_usage (kernel/locking/lockdep.c:4642)
[  154.827002][    C1]  __lock_acquire (kernel/locking/lockdep.c:5191)
[  154.827003][    C1]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[  154.827005][    C1]  ? rcu_do_batch (./include/linux/rcupdate.h:310 (discriminator 2) kernel/rcu/tree.c:2619 (discriminator 2))
[  154.827007][    C1]  lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  154.827009][    C1]  ? tcf_mirred_release (./include/linux/spinlock.h:342 net/sched/act_mirred.c:78) act_mirred
[  154.827011][    C1]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  154.827012][    C1]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[  154.827014][    C1]  _raw_spin_lock (./include/linux/spinlock_api_smp.h:158 (discriminator 1) kernel/locking/spinlock.c:158 (discriminator 1))
[  154.827016][    C1]  ? tcf_mirred_release (./include/linux/spinlock.h:342 net/sched/act_mirred.c:78) act_mirred
[  154.827017][    C1] tcf_mirred_release (./include/linux/spinlock.h:342 net/sched/act_mirred.c:78) act_mirred
[  154.827019][    C1]  tcf_action_rcu_free (net/sched/act_api.c:367 net/sched/act_api.c:378)
[  154.827021][    C1]  ? rcu_do_batch (./include/linux/rcupdate.h:310 (discriminator 2) kernel/rcu/tree.c:2619 (discriminator 2))
[  154.827022][    C1]  rcu_do_batch (kernel/rcu/tree.c:2617)
[  154.827025][    C1]  ? trace_rcu_batch_end (./include/trace/events/rcu.h:714 (discriminator 19))
[  154.827027][    C1]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[  154.827028][    C1]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[  154.827030][    C1]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  154.827032][    C1]  rcu_core (kernel/rcu/tree.c:2869)
[  154.827034][    C1]  handle_softirqs (kernel/softirq.c:622)
[  154.827035][    C1]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  154.827038][    C1]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  154.827040][    C1]  ? _local_bh_enable (kernel/softirq.c:405 (discriminator 1))
[  154.827042][    C1]  __irq_exit_rcu (kernel/softirq.c:656 kernel/softirq.c:496 kernel/softirq.c:735)
[  154.827043][    C1]  irq_exit_rcu (kernel/softirq.c:752)
[  154.827045][    C1]  sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1061 (discriminator 37) arch/x86/kernel/apic/apic.c:1061 (discriminator 37))
[  154.827046][    C1]  </IRQ>
[  154.827047][    C1]  <TASK>
[  154.827048][    C1]  ? init_data_structures_once.part.0 (kernel/locking/lockdep.c:3397 (discriminator 1) kernel/locking/lockdep.c:3438 (discriminator 1) kernel/locking/lockdep.c:3482 (discriminator 1) kernel/locking/lockdep.c:1210 (discriminator 1))
[  154.827049][    C1]  asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:697)
[  154.827051][    C1] RIP: 0010:lock_release (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:127 kernel/locking/lockdep.c:5885 kernel/locking/lockdep.c:5875)
[  154.827053][    C1] Code: 04 85 d2 0f 85 84 00 00 00 65 48 8b 05 c0 8b 33 04 8b 80 ec 0a 00 00 85 c0 75 72 48 81 3b a0 1d 6c ac 74 69 4c 89 7c 24 18 9c <58> 49 89 c7 fa 48 c7 c7 cd 44 03 ab e8 46 16 33 02 4c 89 f6 48 89
All code
========
   0:	04 85                	add    $0x85,%al
   2:	d2 0f                	rorb   %cl,(%rdi)
   4:	85 84 00 00 00 65 48 	test   %eax,0x48650000(%rax,%rax,1)
   b:	8b 05 c0 8b 33 04    	mov    0x4338bc0(%rip),%eax        # 0x4338bd1
  11:	8b 80 ec 0a 00 00    	mov    0xaec(%rax),%eax
  17:	85 c0                	test   %eax,%eax
  19:	75 72                	jne    0x8d
  1b:	48 81 3b a0 1d 6c ac 	cmpq   $0xffffffffac6c1da0,(%rbx)
  22:	74 69                	je     0x8d
  24:	4c 89 7c 24 18       	mov    %r15,0x18(%rsp)
  29:	9c                   	pushf
  2a:*	58                   	pop    %rax		<-- trapping instruction
  2b:	49 89 c7             	mov    %rax,%r15
  2e:	fa                   	cli
  2f:	48 c7 c7 cd 44 03 ab 	mov    $0xffffffffab0344cd,%rdi
  36:	e8 46 16 33 02       	call   0x2331681
  3b:	4c 89 f6             	mov    %r14,%rsi
  3e:	48                   	rex.W
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	58                   	pop    %rax
   1:	49 89 c7             	mov    %rax,%r15
   4:	fa                   	cli
   5:	48 c7 c7 cd 44 03 ab 	mov    $0xffffffffab0344cd,%rdi
   c:	e8 46 16 33 02       	call   0x2331657
  11:	4c 89 f6             	mov    %r14,%rsi
  14:	48                   	rex.W
  15:	89                   	.byte 0x89
[  154.827055][    C1] RSP: 0018:ffa00000001b7590 EFLAGS: 00000202
[  154.827057][    C1] RAX: 0000000000000000 RBX: ffffffffab577d20 RCX: 0000000000000001
[  154.827058][    C1] RDX: 0000000000000000 RSI: ffffffffaaa6f640 RDI: ffffffffab09e948
[  154.827059][    C1] RBP: ffa00000001b7e68 R08: ffffffffac0f1834 R09: ffffffffabee11e4
[  154.827060][    C1] R10: 0000000000000001 R11: 0000000000000000 R12: ffa00000001b7e01
[  154.827061][    C1] R13: ffa00000001b76c0 R14: ffffffffa814a6e1 R15: 000000000002608f
[  154.827062][    C1]  ? unwind_next_frame (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) ./include/linux/rcupdate.h:1181 (discriminator 2) arch/x86/kernel/unwind_orc.c:495 (discriminator 2))
[  154.827065][    C1]  unwind_next_frame (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) ./include/linux/rcupdate.h:1181 (discriminator 2) arch/x86/kernel/unwind_orc.c:495 (discriminator 2))
[  154.827066][    C1]  ? worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[  154.827068][    C1]  ? stack_access_ok (./arch/x86/include/asm/stacktrace.h:55)
[  154.827070][    C1]  ? stack_access_ok (./arch/x86/include/asm/stacktrace.h:55)
[  154.827071][    C1]  ? __unwind_start (arch/x86/kernel/unwind_orc.c:787)
[  154.827073][    C1]  ? write_profile (profile.c:?)
[  154.827075][    C1]  arch_stack_walk (arch/x86/kernel/stacktrace.c:25)
[  154.827078][    C1]  ? kthread (kernel/kthread.c:436)
[  154.827081][    C1]  ? detach_buf_split_in_order (drivers/virtio/virtio_ring.c:850 drivers/virtio/virtio_ring.c:881)
[  154.827085][    C1]  stack_trace_save (kernel/stacktrace.c:122 (discriminator 1))
[  154.827087][    C1]  ? filter_irq_stacks (kernel/stacktrace.c:402)
[  154.827088][    C1]  ? validate_chain (kernel/locking/lockdep.c:3801 (discriminator 2) kernel/locking/lockdep.c:3821 (discriminator 2) kernel/locking/lockdep.c:3876 (discriminator 2))
[  154.827090][    C1]  ? detach_buf_split_in_order (drivers/virtio/virtio_ring.c:850 drivers/virtio/virtio_ring.c:881)
[  154.827092][    C1]  ? kasan_save_stack (mm/kasan/common.c:58)
[  154.827095][    C1]  kasan_save_stack (mm/kasan/common.c:57)
[  154.827096][    C1]  ? kasan_save_stack (mm/kasan/common.c:57)
[  154.827098][    C1]  ? kasan_save_track (mm/kasan/common.c:78)
[  154.827100][    C1]  ? kasan_save_free_info (mm/kasan/generic.c:584)
[  154.827102][    C1]  ? __kasan_slab_free (mm/kasan/common.c:253 mm/kasan/common.c:285)
[  154.827103][    C1]  ? kfree (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6251 mm/slub.c:6566)
[  154.827105][    C1]  ? detach_buf_split_in_order (drivers/virtio/virtio_ring.c:850 drivers/virtio/virtio_ring.c:881)
[  154.827107][    C1]  ? virtqueue_get_buf_ctx_split (drivers/virtio/virtio_ring.c:891 drivers/virtio/virtio_ring.c:958)
[  154.827108][    C1]  ? virtio_fs_requests_done_work (fs/fuse/virtio_fs.c:843 (discriminator 1))
[  154.827110][    C1]  ? process_one_work (kernel/workqueue.c:3314)
[  154.827111][    C1]  ? worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[  154.827116][    C1]  kasan_save_track (mm/kasan/common.c:78)
[  154.827118][    C1]  kasan_save_free_info (mm/kasan/generic.c:584)
[  154.827120][    C1]  __kasan_slab_free (mm/kasan/common.c:253 mm/kasan/common.c:285)
[  154.827122][    C1]  kfree (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6251 mm/slub.c:6566)
[  154.827124][    C1]  detach_buf_split_in_order (drivers/virtio/virtio_ring.c:850 drivers/virtio/virtio_ring.c:881)
[  154.827126][    C1]  ? do_raw_spin_lock (./include/linux/instrumented.h:55 ./include/linux/atomic/atomic-instrumented.h:1301 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116)
[  154.827128][    C1]  virtqueue_get_buf_ctx_split (drivers/virtio/virtio_ring.c:891 drivers/virtio/virtio_ring.c:958)
[  154.827130][    C1]  virtio_fs_requests_done_work (fs/fuse/virtio_fs.c:843 (discriminator 1))
[  154.827133][    C1]  ? virtio_fs_complete_req_work (fs/fuse/virtio_fs.c:823)
[  154.827134][    C1]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[  154.827136][    C1]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[  154.827138][    C1]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  154.827140][    C1]  process_one_work (kernel/workqueue.c:3314)
[  154.827142][    C1]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[  154.827144][    C1]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  154.827147][    C1]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[  154.827149][    C1]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[  154.827151][    C1]  kthread (kernel/kthread.c:436)
[  154.827152][    C1]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[  154.827156][    C1]  ? kthread_affine_node (kernel/kthread.c:378)
[  154.827157][    C1]  ret_from_fork (arch/x86/kernel/process.c:158)
[  154.827160][    C1]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[  154.827161][    C1]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[  154.827164][    C1]  ? kthread_affine_node (kernel/kthread.c:378)


Finger prints:
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock