======================================
| [   28.517964][    C3] 1 lock held by ksoftirqd/3/32:
| [ 28.518144][ C3] #0: ffffffff995774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   28.518461][    C3]
| [   28.518461][    C3] stack backtrace:
[   28.518687][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   28.518690][    C3] Call Trace:
[   28.518692][    C3]  <TASK>
[ 28.518694][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 28.518702][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 28.518707][ C3] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 28.518711][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 28.518717][ C3] ? save_trace (kernel/locking/lockdep.c:595) 
[ 28.518724][ C3] mark_lock (kernel/locking/lockdep.c:4756) 
[ 28.518728][ C3] mark_usage (kernel/locking/lockdep.c:4645) 
[ 28.518731][ C3] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 28.518734][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 28.518738][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 28.518741][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 28.518745][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 28.518750][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 28.518753][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 28.518757][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 28.518761][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 28.518764][ C3] simple_pin_fs (fs/libfs.c:1067) 
[ 28.518768][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 28.518771][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 28.518779][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 28.518783][ C3] ? __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:2376) 
[ 28.518790][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 28.518793][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 28.518796][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 28.518802][ C3] ? kthread (kernel/kthread.c:464) 
[ 28.518805][ C3] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 28.518808][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 28.518811][ C3] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 28.518817][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 28.518822][ C3] __put_net (net/core/net_namespace.c:732) 
[ 28.518827][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 28.518831][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 28.518833][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 28.518838][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 28.518842][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 28.518844][ C3] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 28.518848][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 28.518852][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 28.518857][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 28.518861][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 28.518865][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 28.518867][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 28.518871][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 28.518875][ C3] kthread (kernel/kthread.c:464) 
[ 28.518878][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 28.518880][ C3] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 28.518883][ C3] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 28.518886][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 28.518889][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 28.518892][ C3] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 28.518895][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 28.518897][ C3] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   28.529482][    C3] RCU nest depth: 0, expected: 0
| [   28.529646][    C3] INFO: lockdep is turned off.
| [   28.529808][    C3] Preemption disabled at:
| [ 28.529810][ C3] handle_softirqs (kernel/softirq.c:553) 
[   28.530142][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   28.530144][    C3] Call Trace:
[   28.530146][    C3]  <TASK>
[ 28.530148][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 28.530157][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 28.530165][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 28.530169][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 28.530172][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 28.530177][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 28.530181][ C3] ? 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) 
[ 28.530188][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 28.530191][ C3] ? 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) 
[ 28.530194][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 28.530199][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 28.530202][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 28.530209][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 28.530213][ C3] ? __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:2376) 
[ 28.530218][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 28.530221][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 28.530225][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 28.530229][ C3] ? kthread (kernel/kthread.c:464) 
[ 28.530231][ C3] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 28.530235][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 28.530240][ C3] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 28.530244][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 28.530249][ C3] __put_net (net/core/net_namespace.c:732) 
[ 28.530254][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 28.530258][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 28.530261][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 28.530266][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 28.530269][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 28.530272][ C3] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 28.530275][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 28.530279][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 28.530284][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 28.530288][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 28.530291][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 28.530294][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 28.530298][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 28.530302][ C3] kthread (kernel/kthread.c:464) 
[ 28.530307][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 28.530309][ C3] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 28.530312][ C3] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 28.530315][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 28.530319][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 28.530322][ C3] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 28.530325][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 28.530327][ C3] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   30.857375][    C1] INFO: lockdep is turned off.
| [   30.857537][    C1] Preemption disabled at:
| [ 30.857539][ C1] handle_softirqs (kernel/softirq.c:553) 
| [   30.857882][    C1] Tainted: [W]=WARN
[   30.857883][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   30.857885][    C1] Call Trace:
[   30.857888][    C1]  <TASK>
[ 30.857890][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 30.857900][ C1] __might_resched (kernel/sched/core.c:8796) 
[ 30.857908][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 30.857913][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 30.857917][ C1] ? simple_recursive_removal (fs/libfs.c:614) 
[ 30.857922][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 30.857928][ 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) 
[ 30.857936][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 30.857939][ 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) 
[ 30.857942][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 30.857949][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 30.857952][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 30.857960][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 30.857963][ 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:2376) 
[ 30.857971][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 30.857975][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 30.857978][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 30.857983][ C1] ? kthread (kernel/kthread.c:464) 
[ 30.857986][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 30.857991][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 30.857999][ C1] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 30.858004][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 30.858007][ C1] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 30.858012][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 30.858017][ C1] __put_net (net/core/net_namespace.c:732) 
[ 30.858022][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 30.858026][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 30.858029][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 30.858033][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 30.858037][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 30.858040][ C1] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 30.858048][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 30.858054][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 30.858058][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 30.858062][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 30.858064][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 30.858068][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 30.858072][ C1] kthread (kernel/kthread.c:464) 
[ 30.858075][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 30.858077][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 30.858081][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 30.858084][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 30.858087][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 30.858091][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 30.858093][ C1] ? __pfx_kthread (kernel/kthread.c:413) 


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