======================================
| [   13.302833][    C0] 1 lock held by ksoftirqd/0/14:
| [ 13.303024][ C0] #0: ffffffffaf1774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   13.303340][    C0]
| [   13.303340][    C0] stack backtrace:
[   13.303562][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.303564][    C0] Call Trace:
[   13.303566][    C0]  <TASK>
[ 13.303568][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.303574][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 13.303579][ C0] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 13.303584][ C0] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 13.303589][ C0] ? save_trace (kernel/locking/lockdep.c:595) 
[ 13.303593][ C0] mark_lock (kernel/locking/lockdep.c:4756) 
[ 13.303597][ C0] mark_usage (kernel/locking/lockdep.c:4645) 
[ 13.303600][ C0] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 13.303604][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 13.303608][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 13.303612][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 13.303615][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.303621][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 13.303623][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 13.303627][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 13.303631][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 13.303633][ C0] simple_pin_fs (fs/libfs.c:1067) 
[ 13.303636][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 13.303640][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 13.303644][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.303647][ 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:2376) 
[ 13.303652][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.303655][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.303658][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 13.303661][ C0] ? kthread (kernel/kthread.c:464) 
[ 13.303664][ C0] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 13.303668][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 13.303671][ C0] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 13.303675][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 13.303681][ C0] __put_net (net/core/net_namespace.c:732) 
[ 13.303685][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 13.303689][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.303692][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.303697][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 13.303701][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.303704][ C0] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 13.303707][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 13.303713][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 13.303717][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 13.303722][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 13.303726][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 13.303729][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 13.303732][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 13.303735][ C0] kthread (kernel/kthread.c:464) 
[ 13.303738][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.303740][ C0] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 13.303743][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 13.303747][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.303750][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.303754][ C0] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 13.303756][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.303759][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   13.314352][    C0] RCU nest depth: 0, expected: 0
| [   13.314605][    C0] INFO: lockdep is turned off.
| [   13.314769][    C0] Preemption disabled at:
| [ 13.314770][ C0] handle_softirqs (kernel/softirq.c:553) 
[   13.315093][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.315096][    C0] Call Trace:
[   13.315097][    C0]  <TASK>
[ 13.315099][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.315105][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 13.315113][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 13.315117][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 13.315120][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 13.315124][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.315130][ 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) 
[ 13.315134][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 13.315137][ 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) 
[ 13.315139][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 13.315145][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 13.315148][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 13.315152][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.315155][ 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:2376) 
[ 13.315160][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.315164][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.315166][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 13.315169][ C0] ? kthread (kernel/kthread.c:464) 
[ 13.315172][ C0] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 13.315176][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 13.315179][ C0] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 13.315183][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 13.315189][ C0] __put_net (net/core/net_namespace.c:732) 
[ 13.315193][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 13.315197][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.315200][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.315205][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 13.315208][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.315212][ C0] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 13.315215][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 13.315221][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 13.315226][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 13.315230][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 13.315234][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 13.315237][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 13.315240][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 13.315244][ C0] kthread (kernel/kthread.c:464) 
[ 13.315247][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.315249][ C0] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 13.315252][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 13.315257][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.315260][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.315264][ C0] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 13.315267][ 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