======================================
| [   19.958809][    C1] 1 lock held by ksoftirqd/1/22:
| [ 19.958974][ C1] #0: ffffffff8d374480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   19.959272][    C1]
| [   19.959272][    C1] stack backtrace:
[   19.959486][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   19.959488][    C1] Call Trace:
[   19.959489][    C1]  <TASK>
[ 19.959492][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 19.959497][ C1] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 19.959502][ C1] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 19.959507][ C1] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 19.959512][ C1] ? save_trace (kernel/locking/lockdep.c:594) 
[ 19.959516][ C1] mark_lock (kernel/locking/lockdep.c:4754) 
[ 19.959520][ C1] mark_usage (kernel/locking/lockdep.c:4643) 
[ 19.959524][ C1] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 19.959529][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 19.959532][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 19.959536][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 19.959542][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 19.959545][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 19.959549][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 19.959552][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 19.959555][ C1] simple_pin_fs (fs/libfs.c:1066) 
[ 19.959559][ C1] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 19.959562][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 19.959567][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 19.959570][ C1] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 19.959575][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 19.959578][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 19.959581][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 19.959585][ C1] ? kthread (kernel/kthread.c:464) 
[ 19.959588][ C1] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 19.959591][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 19.959594][ C1] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2417) 
[ 19.959598][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 19.959603][ C1] __put_net (net/core/net_namespace.c:732) 
[ 19.959607][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 19.959611][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 19.959613][ C1] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 19.959618][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 19.959622][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 19.959626][ C1] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 19.959629][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 19.959635][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 19.959638][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 19.959642][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 19.959645][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 19.959647][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 19.959650][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 19.959653][ C1] kthread (kernel/kthread.c:464) 
[ 19.959657][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.959659][ C1] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 19.959662][ C1] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 19.959666][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 19.959669][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.959673][ C1] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 19.959676][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.959679][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   19.969685][    C1] RCU nest depth: 0, expected: 0
| [   19.969839][    C1] INFO: lockdep is turned off.
| [   19.970002][    C1] Preemption disabled at:
| [ 19.970004][ C1] handle_softirqs (kernel/softirq.c:553) 
[   19.970319][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   19.970320][    C1] Call Trace:
[   19.970322][    C1]  <TASK>
[ 19.970324][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 19.970329][ C1] __might_resched (kernel/sched/core.c:8819) 
[ 19.970334][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 19.970337][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 19.970340][ C1] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 19.970343][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 19.970348][ C1] ? 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) 
[ 19.970352][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 19.970354][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 19.970358][ C1] ? 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) 
[ 19.970362][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 19.970365][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 19.970369][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 19.970372][ C1] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 19.970375][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 19.970379][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 19.970382][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 19.970385][ C1] ? kthread (kernel/kthread.c:464) 
[ 19.970388][ C1] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 19.970392][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 19.970395][ C1] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2417) 
[ 19.970399][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 19.970406][ C1] __put_net (net/core/net_namespace.c:732) 
[ 19.970409][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 19.970413][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 19.970416][ C1] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 19.970421][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 19.970425][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 19.970428][ C1] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 19.970432][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 19.970438][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 19.970440][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 19.970444][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 19.970447][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 19.970449][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 19.970452][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 19.970456][ C1] kthread (kernel/kthread.c:464) 
[ 19.970459][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.970462][ C1] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 19.970466][ C1] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 19.970470][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 19.970473][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.970477][ C1] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 19.970480][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.970483][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   25.844502][    C2] INFO: lockdep is turned off.
| [   25.844677][    C2] Preemption disabled at:
| [ 25.844679][ C2] 0x0 
| [   25.845002][    C2] Tainted: [W]=WARN
[   25.845003][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   25.845005][    C2] Call Trace:
[   25.845007][    C2]  <IRQ>
[ 25.845009][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 25.845016][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 25.845023][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 25.845027][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 25.845030][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 25.845035][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 25.845040][ C2] ? 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) 
[ 25.845045][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 25.845048][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 25.845052][ C2] ? 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) 
[ 25.845057][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 25.845059][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 25.845064][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 25.845067][ C2] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 25.845072][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 25.845077][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 25.845080][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 25.845083][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 25.845088][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 25.845092][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 25.845095][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 25.845097][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 25.845099][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.845105][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 25.845107][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 25.845110][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 25.845115][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 25.845119][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 25.845123][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 25.845128][ C2] __put_net (net/core/net_namespace.c:732) 
[ 25.845131][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 25.845135][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 25.845137][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 25.845142][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 25.845147][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 25.845152][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 25.845155][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 25.845160][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 25.845162][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 25.845164][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   25.845168][    C2]  </IRQ>
[   25.845169][    C2]  <TASK>
[ 25.845170][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 25.845173][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 25.845177][ C2] Code: b0 b8 00 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d a3 d0 13 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	b0 b8                	mov    $0xb8,%al
   2:	00 c3                	add    %al,%bl
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	0f 1f 00             	nopl   (%rax)
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d a3 d0 13 00 	verw   0x13d0a3(%rip)        # 0x13d0cb
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	cc                   	int3
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  36:	00 00 00 
  39:	66 90                	xchg   %ax,%ax
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	c3                   	ret
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   c:	00 00 00 
   f:	66 90                	xchg   %ax,%ax
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[   25.845180][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   25.845183][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffff8c355a19
[   25.845185][    C2] RDX: ffffed1006c2667b RSI: ffffffff8c650c60 RDI: ffffffff89b84d8f
[   25.845187][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c2667a
[   25.845189][    C2] R10: ffff8880361333d3 R11: ffff888001b9cb58 R12: 0000000000000000
[   25.845191][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 25.845194][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 25.845198][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.845203][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 25.845205][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 25.845207][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.845211][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 25.845215][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 25.845220][ C2] do_idle (kernel/sched/idle.c:325) 
[ 25.845224][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 25.845227][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 25.845231][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 


Finger prints:
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock
__might_resched:down_write:simple_recursive_removal:debugfs_remove:ref_tracker_dir_exit
handle_softirqs:dump_stack_lvl:__might_resched:down_write:simple_recursive_removal