======================================
| [   16.070688][    C2] 1 lock held by ksoftirqd/2/27:
| [ 16.070852][ C2] #0: ffffffff96574480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   16.071152][    C2]
| [   16.071152][    C2] stack backtrace:
[   16.071373][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.071375][    C2] Call Trace:
[   16.071377][    C2]  <TASK>
[ 16.071379][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.071384][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 16.071390][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 16.071395][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 16.071401][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 16.071405][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 16.071410][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 16.071413][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 16.071418][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 16.071422][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 16.071426][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.071432][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 16.071435][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 16.071439][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 16.071442][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 16.071446][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 16.071450][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 16.071453][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.071458][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.071461][ C2] ? __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) 
[ 16.071465][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.071468][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.071471][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.071474][ C2] ? kthread (kernel/kthread.c:464) 
[ 16.071478][ C2] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 16.071481][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 16.071484][ C2] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2417) 
[ 16.071489][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 16.071495][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.071498][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 16.071502][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.071505][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.071510][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.071514][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.071517][ C2] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 16.071521][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 16.071527][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.071530][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.071533][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 16.071536][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 16.071538][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.071542][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 16.071545][ C2] kthread (kernel/kthread.c:464) 
[ 16.071548][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.071551][ C2] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 16.071554][ C2] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 16.071558][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.071561][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.071565][ C2] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 16.071568][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.071571][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   16.082079][    C2] RCU nest depth: 0, expected: 0
| [   16.082250][    C2] INFO: lockdep is turned off.
| [   16.082431][    C2] Preemption disabled at:
| [ 16.082433][ C2] handle_softirqs (kernel/softirq.c:553) 
[   16.082791][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.082793][    C2] Call Trace:
[   16.082795][    C2]  <TASK>
[ 16.082798][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.082804][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 16.082810][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.082813][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.082816][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 16.082820][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.082826][ C2] ? 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) 
[ 16.082830][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 16.082833][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.082837][ C2] ? 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) 
[ 16.082841][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.082844][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.082849][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.082852][ C2] ? __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) 
[ 16.082857][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.082861][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.082864][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.082867][ C2] ? kthread (kernel/kthread.c:464) 
[ 16.082871][ C2] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 16.082875][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 16.082880][ C2] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2417) 
[ 16.082885][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 16.082890][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.082894][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 16.082897][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.082900][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.082905][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.082909][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.082913][ C2] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 16.082916][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 16.082922][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.082925][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.082929][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 16.082932][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 16.082934][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.082937][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 16.082941][ C2] kthread (kernel/kthread.c:464) 
[ 16.082944][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.082947][ C2] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 16.082950][ C2] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 16.082955][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.082959][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.082962][ C2] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 16.082965][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.082968][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   18.382611][    C3] INFO: lockdep is turned off.
| [   18.382852][    C3] Preemption disabled at:
| [ 18.382855][ C3] handle_softirqs (kernel/softirq.c:553) 
| [   18.383266][    C3] Tainted: [W]=WARN
[   18.383268][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.383271][    C3] Call Trace:
[   18.383274][    C3]  <TASK>
[ 18.383277][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.383287][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 18.383296][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 18.383302][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 18.383306][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 18.383313][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.383321][ C3] ? 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) 
[ 18.383328][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 18.383332][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 18.383338][ C3] ? 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) 
[ 18.383345][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 18.383350][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 18.383356][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 18.383361][ C3] ? __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) 
[ 18.383368][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 18.383374][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 18.383379][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 18.383384][ C3] ? kthread (kernel/kthread.c:464) 
[ 18.383391][ C3] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 18.383398][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 18.383407][ C3] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2417) 
[ 18.383414][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 18.383421][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 18.383426][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.383433][ C3] __put_net (net/core/net_namespace.c:732) 
[ 18.383437][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 18.383443][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 18.383448][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 18.383457][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 18.383464][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.383469][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 18.383479][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 18.383484][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 18.383489][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 18.383494][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 18.383497][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 18.383502][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 18.383507][ C3] kthread (kernel/kthread.c:464) 
[ 18.383511][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.383515][ C3] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 18.383520][ C3] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 18.383527][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.383532][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.383538][ C3] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 18.383543][ C3] ? __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