======================================
| [   13.281500][    C0] 1 lock held by ksoftirqd/0/14:
| [ 13.281682][ C0] #0: ffffffffb8f74480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   13.282013][    C0]
| [   13.282013][    C0] stack backtrace:
[   13.282248][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.282250][    C0] Call Trace:
[   13.282252][    C0]  <TASK>
[ 13.282255][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.282262][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 13.282266][ C0] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 13.282271][ C0] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 13.282276][ C0] ? save_trace (kernel/locking/lockdep.c:594) 
[ 13.282282][ C0] mark_lock (kernel/locking/lockdep.c:4754) 
[ 13.282286][ C0] mark_usage (kernel/locking/lockdep.c:4643) 
[ 13.282288][ C0] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 13.282293][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 13.282296][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.282299][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.282303][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 13.282305][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.282309][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 13.282311][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.282314][ C0] simple_pin_fs (fs/libfs.c:1066) 
[ 13.282317][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 13.282320][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 13.282327][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.282330][ 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:2333) 
[ 13.282337][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.282341][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.282344][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 13.282350][ C0] ? kthread (kernel/kthread.c:464) 
[ 13.282355][ C0] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 13.282357][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 13.282360][ 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) 
[ 13.282364][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 13.282369][ C0] __put_net (net/core/net_namespace.c:732) 
[ 13.282373][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 13.282376][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.282379][ C0] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.282385][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 13.282389][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.282391][ C0] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 13.282395][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 13.282401][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 13.282405][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 13.282409][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 13.282413][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 13.282415][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 13.282419][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 13.282423][ C0] kthread (kernel/kthread.c:464) 
[ 13.282427][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.282430][ C0] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 13.282432][ C0] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 13.282435][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.282438][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.282442][ C0] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 13.282444][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.282448][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   13.293553][    C0] RCU nest depth: 0, expected: 0
| [   13.293729][    C0] INFO: lockdep is turned off.
| [   13.293896][    C0] Preemption disabled at:
| [ 13.293898][ C0] handle_softirqs (kernel/softirq.c:553) 
[   13.294254][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.294256][    C0] Call Trace:
[   13.294258][    C0]  <TASK>
[ 13.294260][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.294268][ C0] __might_resched (kernel/sched/core.c:8819) 
[ 13.294274][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 13.294278][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 13.294280][ C0] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 13.294285][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.294290][ 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) 
[ 13.294295][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 13.294298][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 13.294303][ 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) 
[ 13.294308][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 13.294311][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 13.294317][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.294320][ 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:2333) 
[ 13.294326][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.294330][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.294333][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 13.294338][ C0] ? kthread (kernel/kthread.c:464) 
[ 13.294342][ C0] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 13.294346][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 13.294351][ 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) 
[ 13.294355][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 13.294360][ C0] __put_net (net/core/net_namespace.c:732) 
[ 13.294363][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 13.294367][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.294370][ C0] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.294376][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 13.294380][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.294382][ C0] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 13.294386][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 13.294391][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 13.294395][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 13.294398][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 13.294402][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 13.294404][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 13.294408][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 13.294411][ C0] kthread (kernel/kthread.c:464) 
[ 13.294415][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.294418][ C0] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 13.294420][ C0] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 13.294423][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.294426][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.294429][ C0] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 13.294431][ C0] ? __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