======================================
| [   14.208538][    C1] 1 lock held by ksoftirqd/1/22:
| [ 14.208716][ C1] #0: ffffffff87174480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   14.209034][    C1]
| [   14.209034][    C1] stack backtrace:
[   14.209262][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.209264][    C1] Call Trace:
[   14.209266][    C1]  <TASK>
[ 14.209270][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.209277][ C1] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 14.209281][ C1] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 14.209285][ C1] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 14.209289][ C1] ? save_trace (kernel/locking/lockdep.c:594) 
[ 14.209295][ C1] mark_lock (kernel/locking/lockdep.c:4754) 
[ 14.209298][ C1] mark_usage (kernel/locking/lockdep.c:4643) 
[ 14.209301][ C1] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 14.209305][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 14.209308][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.209311][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.209314][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 14.209316][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.209320][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 14.209323][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.209325][ C1] simple_pin_fs (fs/libfs.c:1066) 
[ 14.209328][ C1] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 14.209332][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 14.209338][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.209341][ 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) 
[ 14.209346][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.209349][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.209353][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.209358][ C1] ? kthread (kernel/kthread.c:464) 
[ 14.209362][ C1] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 14.209364][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 14.209368][ 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) 
[ 14.209371][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 14.209376][ C1] __put_net (net/core/net_namespace.c:732) 
[ 14.209380][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 14.209384][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.209387][ C1] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.209392][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 14.209396][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.209399][ C1] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 14.209402][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 14.209407][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 14.209411][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 14.209415][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 14.209418][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 14.209421][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.209424][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 14.209428][ C1] kthread (kernel/kthread.c:464) 
[ 14.209432][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.209435][ C1] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 14.209437][ C1] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 14.209440][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.209443][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.209447][ C1] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 14.209449][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.209452][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   14.220168][    C1] RCU nest depth: 0, expected: 0
| [   14.220326][    C1] INFO: lockdep is turned off.
| [   14.220524][    C1] Preemption disabled at:
| [ 14.220526][ C1] handle_softirqs (kernel/softirq.c:553) 
[   14.220857][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.220859][    C1] Call Trace:
[   14.220860][    C1]  <TASK>
[ 14.220863][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.220869][ C1] __might_resched (kernel/sched/core.c:8819) 
[ 14.220875][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 14.220879][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 14.220881][ C1] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 14.220886][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.220890][ 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) 
[ 14.220895][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 14.220897][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 14.220902][ 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) 
[ 14.220906][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 14.220910][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 14.220915][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.220918][ 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) 
[ 14.220924][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.220928][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.220931][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.220935][ C1] ? kthread (kernel/kthread.c:464) 
[ 14.220939][ C1] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 14.220942][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 14.220947][ 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) 
[ 14.220950][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 14.220955][ C1] __put_net (net/core/net_namespace.c:732) 
[ 14.220958][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 14.220962][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.220965][ C1] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.220970][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 14.220974][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.220977][ C1] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 14.220980][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 14.220985][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 14.220989][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 14.220993][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 14.220996][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 14.220999][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.221003][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 14.221007][ C1] kthread (kernel/kthread.c:464) 
[ 14.221010][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.221014][ C1] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 14.221016][ C1] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 14.221019][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.221021][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.221025][ C1] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 14.221027][ 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