======================================
| [ 3131.565722][    C0] 1 lock held by ksoftirqd/0/14:
| [ 3131.565908][ C0] #0: ffffffffae78b540 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [ 3131.566346][    C0]
| [ 3131.566346][    C0] stack backtrace:
[ 3131.566573][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 3131.566575][    C0] Call Trace:
[ 3131.566578][    C0]  <TASK>
[ 3131.566580][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 3131.566587][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 3131.566592][ C0] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 3131.566596][ C0] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 3131.566601][ C0] ? save_trace (kernel/locking/lockdep.c:595) 
[ 3131.566608][ C0] mark_lock (kernel/locking/lockdep.c:4756) 
[ 3131.566611][ C0] mark_usage (kernel/locking/lockdep.c:4645) 
[ 3131.566614][ C0] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 3131.566617][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 3131.566621][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 3131.566624][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 3131.566627][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 3131.566631][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 3131.566633][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 3131.566637][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 3131.566640][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 3131.566642][ C0] simple_pin_fs (fs/libfs.c:1067) 
[ 3131.566645][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 3131.566649][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 3131.566655][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 3131.566658][ 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) 
[ 3131.566663][ C0] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 3131.566667][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 3131.566670][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 3131.566675][ C0] ? kthread (kernel/kthread.c:464) 
[ 3131.566680][ C0] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 3131.566682][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 3131.566685][ 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) 
[ 3131.566690][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 3131.566695][ C0] __put_net (net/core/net_namespace.c:732) 
[ 3131.566702][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 3131.566705][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 3131.566708][ C0] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 3131.566714][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 3131.566718][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 3131.566721][ C0] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 3131.566723][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 3131.566730][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 3131.566735][ C0] handle_softirqs (kernel/softirq.c:580) 
[ 3131.566739][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 3131.566742][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 3131.566745][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 3131.566748][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 3131.566752][ C0] kthread (kernel/kthread.c:464) 
[ 3131.566756][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 3131.566759][ C0] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 3131.566761][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 3131.566764][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 3131.566767][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 3131.566771][ C0] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 3131.566773][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 3131.566776][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [ 3131.578876][    C0] RCU nest depth: 0, expected: 0
| [ 3131.579039][    C0] INFO: lockdep is turned off.
| [ 3131.579207][    C0] Preemption disabled at:
| [ 3131.579209][ C0] handle_softirqs (kernel/softirq.c:553) 
[ 3131.579553][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 3131.579555][    C0] Call Trace:
[ 3131.579557][    C0]  <TASK>
[ 3131.579559][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 3131.579566][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 3131.579574][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 3131.579578][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 3131.579581][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 3131.579589][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 3131.579593][ 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) 
[ 3131.579598][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 3131.579601][ 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) 
[ 3131.579604][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 3131.579611][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 3131.579614][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 3131.579620][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 3131.579622][ 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) 
[ 3131.579626][ C0] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 3131.579631][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 3131.579633][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 3131.579637][ C0] ? kthread (kernel/kthread.c:464) 
[ 3131.579641][ C0] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 3131.579644][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 3131.579649][ 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) 
[ 3131.579653][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 3131.579658][ C0] __put_net (net/core/net_namespace.c:732) 
[ 3131.579663][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 3131.579667][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 3131.579670][ C0] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 3131.579676][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 3131.579680][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 3131.579683][ C0] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 3131.579685][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 3131.579691][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 3131.579695][ C0] handle_softirqs (kernel/softirq.c:580) 
[ 3131.579699][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 3131.579703][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 3131.579705][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 3131.579709][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 3131.579713][ C0] kthread (kernel/kthread.c:464) 
[ 3131.579716][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 3131.579719][ C0] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 3131.579721][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 3131.579725][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 3131.579728][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 3131.579732][ C0] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 3131.579735][ 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