======================================
| [   13.408700][    C1] 1 lock held by ksoftirqd/1/22:
| [ 13.408887][ C1] #0: ffffffffba7774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   13.409202][    C1]
| [   13.409202][    C1] stack backtrace:
[   13.409421][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.409423][    C1] Call Trace:
[   13.409425][    C1]  <TASK>
[ 13.409427][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.409434][ C1] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 13.409439][ C1] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 13.409444][ C1] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 13.409449][ C1] ? save_trace (kernel/locking/lockdep.c:595) 
[ 13.409453][ C1] mark_lock (kernel/locking/lockdep.c:4756) 
[ 13.409457][ C1] mark_usage (kernel/locking/lockdep.c:4645) 
[ 13.409460][ C1] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 13.409464][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 13.409468][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 13.409471][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 13.409476][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.409481][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 13.409484][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 13.409487][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 13.409492][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 13.409494][ C1] simple_pin_fs (fs/libfs.c:1067) 
[ 13.409497][ C1] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 13.409501][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 13.409506][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 13.409508][ 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) 
[ 13.409513][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.409516][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 13.409519][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 13.409522][ C1] ? kthread (kernel/kthread.c:464) 
[ 13.409526][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 13.409530][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 13.409533][ 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) 
[ 13.409537][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 13.409542][ C1] __put_net (net/core/net_namespace.c:732) 
[ 13.409547][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 13.409551][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.409554][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.409559][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 13.409563][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.409566][ C1] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 13.409569][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 13.409575][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 13.409580][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 13.409585][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 13.409589][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 13.409592][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 13.409595][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 13.409598][ C1] kthread (kernel/kthread.c:464) 
[ 13.409601][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.409604][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 13.409606][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 13.409610][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.409613][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.409617][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 13.409620][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.409623][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   13.420250][    C1] RCU nest depth: 0, expected: 0
| [   13.420409][    C1] INFO: lockdep is turned off.
| [   13.420579][    C1] Preemption disabled at:
| [ 13.420581][ C1] handle_softirqs (kernel/softirq.c:553) 
[   13.420911][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.420914][    C1] Call Trace:
[   13.420917][    C1]  <TASK>
[ 13.420919][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.420927][ C1] __might_resched (kernel/sched/core.c:8796) 
[ 13.420937][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 13.420942][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 13.420947][ C1] ? simple_recursive_removal (fs/libfs.c:614) 
[ 13.420953][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.420961][ 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) 
[ 13.420967][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 13.420972][ 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) 
[ 13.420974][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 13.420980][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 13.420983][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 13.420987][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 13.420990][ 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) 
[ 13.420994][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.420998][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 13.421001][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 13.421003][ C1] ? kthread (kernel/kthread.c:464) 
[ 13.421007][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 13.421011][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 13.421015][ 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) 
[ 13.421018][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 13.421024][ C1] __put_net (net/core/net_namespace.c:732) 
[ 13.421028][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 13.421032][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.421035][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.421040][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 13.421044][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.421047][ C1] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 13.421050][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 13.421055][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 13.421059][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 13.421064][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 13.421068][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 13.421071][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 13.421074][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 13.421077][ C1] kthread (kernel/kthread.c:464) 
[ 13.421080][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.421082][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 13.421085][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 13.421090][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.421093][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.421096][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 13.421099][ C1] ? __pfx_kthread (kernel/kthread.c:413) 


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