======================================
| [   12.694937][    C1] 1 lock held by ksoftirqd/1/22:
| [ 12.695102][ C1] #0: ffffffffa6774480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   12.695397][    C1]
| [   12.695397][    C1] stack backtrace:
[   12.695605][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.695607][    C1] Call Trace:
[   12.695609][    C1]  <TASK>
[ 12.695611][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 12.695618][ C1] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 12.695622][ C1] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 12.695626][ C1] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 12.695630][ C1] ? save_trace (kernel/locking/lockdep.c:594) 
[ 12.695635][ C1] mark_lock (kernel/locking/lockdep.c:4754) 
[ 12.695638][ C1] mark_usage (kernel/locking/lockdep.c:4643) 
[ 12.695641][ C1] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 12.695645][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 12.695648][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 12.695651][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 12.695654][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 12.695657][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 12.695660][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 12.695663][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 12.695666][ C1] simple_pin_fs (fs/libfs.c:1066) 
[ 12.695669][ C1] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 12.695672][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 12.695677][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 12.695681][ 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) 
[ 12.695686][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 12.695689][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 12.695692][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 12.695697][ C1] ? kthread (kernel/kthread.c:464) 
[ 12.695701][ C1] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 12.695703][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 12.695706][ 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) 
[ 12.695709][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 12.695714][ C1] __put_net (net/core/net_namespace.c:732) 
[ 12.695718][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 12.695721][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 12.695724][ C1] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 12.695730][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 12.695734][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 12.695736][ C1] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 12.695740][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 12.695746][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 12.695749][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 12.695753][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 12.695757][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 12.695759][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 12.695763][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 12.695766][ C1] kthread (kernel/kthread.c:464) 
[ 12.695770][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 12.695773][ C1] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 12.695775][ C1] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 12.695778][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 12.695781][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 12.695784][ C1] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 12.695787][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 12.695790][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   12.705576][    C1] RCU nest depth: 0, expected: 0
| [   12.705727][    C1] INFO: lockdep is turned off.
| [   12.705887][    C1] Preemption disabled at:
| [ 12.705889][ C1] handle_softirqs (kernel/softirq.c:553) 
[   12.706201][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.706203][    C1] Call Trace:
[   12.706204][    C1]  <TASK>
[ 12.706206][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 12.706211][ C1] __might_resched (kernel/sched/core.c:8819) 
[ 12.706217][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 12.706220][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 12.706223][ C1] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 12.706226][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 12.706230][ 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) 
[ 12.706235][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 12.706238][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 12.706241][ 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) 
[ 12.706246][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 12.706249][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 12.706253][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 12.706257][ 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) 
[ 12.706260][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 12.706264][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 12.706267][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 12.706270][ C1] ? kthread (kernel/kthread.c:464) 
[ 12.706274][ C1] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 12.706277][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 12.706281][ 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) 
[ 12.706283][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 12.706288][ C1] __put_net (net/core/net_namespace.c:732) 
[ 12.706291][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 12.706294][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 12.706298][ C1] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 12.706303][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 12.706307][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 12.706309][ C1] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 12.706313][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 12.706318][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 12.706321][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 12.706325][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 12.706328][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 12.706331][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 12.706334][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 12.706338][ C1] kthread (kernel/kthread.c:464) 
[ 12.706342][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 12.706344][ C1] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 12.706347][ C1] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 12.706350][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 12.706352][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 12.706356][ C1] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 12.706358][ 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