======================================
| [   17.917131][    C0] 1 lock held by ksoftirqd/0/14:
| [ 17.917333][ C0] #0: ffffffffbc974480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   17.917632][    C0]
| [   17.917632][    C0] stack backtrace:
[   17.917880][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.917881][    C0] Call Trace:
[   17.917883][    C0]  <TASK>
[ 17.917886][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.917892][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 17.917899][ C0] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 17.917904][ C0] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 17.917910][ C0] ? save_trace (kernel/locking/lockdep.c:594) 
[ 17.917914][ C0] mark_lock (kernel/locking/lockdep.c:4754) 
[ 17.917918][ C0] mark_usage (kernel/locking/lockdep.c:4643) 
[ 17.917922][ C0] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 17.917927][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 17.917931][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.917936][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.917942][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 17.917945][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.917950][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 17.917953][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.917957][ C0] simple_pin_fs (fs/libfs.c:1066) 
[ 17.917960][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 17.917965][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.917970][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.917973][ C0] ? __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) 
[ 17.917978][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.917982][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.917984][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 17.917988][ C0] ? kthread (kernel/kthread.c:464) 
[ 17.917991][ C0] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 17.917997][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 17.918001][ C0] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2417) 
[ 17.918005][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 17.918011][ C0] __put_net (net/core/net_namespace.c:732) 
[ 17.918015][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 17.918019][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.918022][ C0] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.918027][ C0] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 17.918032][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.918038][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 17.918043][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 17.918051][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.918057][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.918060][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 17.918065][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 17.918068][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 17.918070][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 17.918074][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 17.918077][ C0] kthread (kernel/kthread.c:464) 
[ 17.918080][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.918083][ C0] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 17.918086][ C0] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 17.918090][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.918094][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.918097][ C0] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 17.918101][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.918104][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   17.930455][    C0] RCU nest depth: 0, expected: 0
| [   17.930624][    C0] INFO: lockdep is turned off.
| [   17.930793][    C0] Preemption disabled at:
| [ 17.930794][ C0] handle_softirqs (kernel/softirq.c:553) 
[   17.931156][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.931158][    C0] Call Trace:
[   17.931161][    C0]  <TASK>
[ 17.931163][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.931170][ C0] __might_resched (kernel/sched/core.c:8819) 
[ 17.931177][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.931180][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.931183][ C0] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 17.931187][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.931193][ C0] ? 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) 
[ 17.931197][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 17.931199][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.931203][ C0] ? 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) 
[ 17.931208][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.931210][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.931216][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.931219][ C0] ? __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) 
[ 17.931224][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.931229][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.931231][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 17.931235][ C0] ? kthread (kernel/kthread.c:464) 
[ 17.931240][ C0] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 17.931245][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 17.931250][ C0] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2417) 
[ 17.931254][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 17.931260][ C0] __put_net (net/core/net_namespace.c:732) 
[ 17.931264][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 17.931267][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.931270][ C0] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.931274][ C0] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 17.931279][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.931283][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 17.931287][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 17.931292][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.931296][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.931299][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 17.931303][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 17.931306][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 17.931308][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 17.931311][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 17.931315][ C0] kthread (kernel/kthread.c:464) 
[ 17.931318][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.931321][ C0] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 17.931324][ C0] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 17.931328][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.931331][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.931335][ C0] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 17.931338][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.931341][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   21.568831][    C2] INFO: lockdep is turned off.
| [   21.569025][    C2] Preemption disabled at:
| [ 21.569027][ C2] 0x0 
| [   21.569435][    C2] Tainted: [W]=WARN
[   21.569437][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   21.569439][    C2] Call Trace:
[   21.569441][    C2]  <IRQ>
[ 21.569445][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 21.569457][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 21.569465][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 21.569469][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 21.569472][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 21.569478][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 21.569485][ 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) 
[ 21.569491][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 21.569494][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 21.569499][ 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) 
[ 21.569504][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 21.569507][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 21.569513][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 21.569516][ 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) 
[ 21.569524][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 21.569529][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 21.569532][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 21.569537][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 21.569545][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 21.569550][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 21.569555][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 21.569559][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 21.569563][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 21.569570][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 21.569574][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 21.569578][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 21.569587][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 21.569593][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 21.569599][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 21.569604][ C2] __put_net (net/core/net_namespace.c:732) 
[ 21.569608][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 21.569613][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 21.569616][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 21.569621][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 21.569625][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 21.569631][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 21.569636][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 21.569640][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 21.569645][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 21.569648][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 21.569651][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   21.569654][    C2]  </IRQ>
[   21.569655][    C2]  <TASK>
[ 21.569657][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 21.569660][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 21.569665][ 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
[   21.569668][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   21.569672][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffffbb955a19
[   21.569674][    C2] RDX: ffffed1006c2667b RSI: ffffffffbbc50c60 RDI: ffffffffb9184d8f
[   21.569676][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c2667a
[   21.569678][    C2] R10: ffff8880361333d3 R11: ffff888001d5cb58 R12: 0000000000000000
[   21.569680][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 21.569684][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 21.569689][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 21.569693][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 21.569695][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 21.569698][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 21.569702][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 21.569706][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 21.569711][ C2] do_idle (kernel/sched/idle.c:325) 
[ 21.569715][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 21.569719][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 21.569723][ 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