======================================
| [   13.279133][    C0] 1 lock held by ksoftirqd/0/14:
| [ 13.279329][ C0] #0: ffffffffa55749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   13.279676][    C0]
| [   13.279676][    C0] stack backtrace:
[   13.279920][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.279923][    C0] Call Trace:
[   13.279925][    C0]  <TASK>
[ 13.279928][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.279936][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 13.279942][ C0] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 13.279946][ C0] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 13.279952][ C0] ? save_trace (kernel/locking/lockdep.c:594) 
[ 13.279959][ C0] mark_lock (kernel/locking/lockdep.c:4754) 
[ 13.279962][ C0] mark_usage (kernel/locking/lockdep.c:4643) 
[ 13.279965][ C0] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 13.279970][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 13.279973][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.279979][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.279983][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 13.279985][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.279989][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 13.279992][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.279995][ C0] simple_pin_fs (fs/libfs.c:1066) 
[ 13.279998][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 13.280003][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 13.280011][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.280015][ 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:2366) 
[ 13.280021][ C0] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 13.280025][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.280028][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 13.280034][ C0] ? kthread (kernel/kthread.c:464) 
[ 13.280040][ C0] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 13.280045][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 13.280049][ 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) 
[ 13.280053][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 13.280058][ C0] __put_net (net/core/net_namespace.c:732) 
[ 13.280063][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 13.280067][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.280070][ C0] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 13.280075][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 13.280080][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.280083][ C0] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 13.280085][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 13.280091][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 13.280095][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 13.280099][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 13.280102][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 13.280105][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 13.280108][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 13.280112][ C0] kthread (kernel/kthread.c:464) 
[ 13.280116][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.280119][ C0] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 13.280121][ C0] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 13.280124][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.280127][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.280131][ C0] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 13.280134][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.280137][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   13.295547][    C0] RCU nest depth: 0, expected: 0
| [   13.295790][    C0] INFO: lockdep is turned off.
| [   13.295969][    C0] Preemption disabled at:
| [ 13.295971][ C0] handle_softirqs (kernel/softirq.c:553) 
[   13.296492][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.296495][    C0] Call Trace:
[   13.296498][    C0]  <TASK>
[ 13.296502][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.296511][ C0] __might_resched (kernel/sched/core.c:8819) 
[ 13.296523][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 13.296529][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 13.296534][ C0] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 13.296541][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.296549][ 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) 
[ 13.296558][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 13.296565][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 13.296572][ 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) 
[ 13.296581][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 13.296587][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 13.296595][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.296601][ 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:2366) 
[ 13.296609][ C0] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 13.296617][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.296622][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 13.296629][ C0] ? kthread (kernel/kthread.c:464) 
[ 13.296636][ C0] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 13.296642][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 13.296648][ 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) 
[ 13.296654][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 13.296665][ C0] __put_net (net/core/net_namespace.c:732) 
[ 13.296670][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 13.296678][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.296683][ C0] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 13.296693][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 13.296702][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.296707][ C0] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 13.296711][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 13.296722][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 13.296729][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 13.296736][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 13.296743][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 13.296748][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 13.296754][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 13.296761][ C0] kthread (kernel/kthread.c:464) 
[ 13.296768][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.296773][ C0] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 13.296777][ C0] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 13.296784][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.296789][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.296796][ C0] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 13.296801][ C0] ? __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