======================================
| [   14.165183][    C2] 1 lock held by ksoftirqd/2/27:
| [ 14.165346][ C2] #0: ffffffffaf974480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   14.165633][    C2]
| [   14.165633][    C2] stack backtrace:
[   14.165839][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.165842][    C2] Call Trace:
[   14.165844][    C2]  <TASK>
[ 14.165847][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.165853][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 14.165858][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 14.165863][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 14.165870][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 14.165874][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 14.165878][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 14.165882][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 14.165887][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 14.165891][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.165895][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.165902][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 14.165905][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.165910][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 14.165913][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.165916][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 14.165920][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 14.165923][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 14.165929][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.165932][ 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) 
[ 14.165939][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.165942][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.165944][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.165949][ C2] ? kthread (kernel/kthread.c:464) 
[ 14.165954][ C2] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 14.165958][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 14.165960][ 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) 
[ 14.165965][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 14.165971][ C2] __put_net (net/core/net_namespace.c:732) 
[ 14.165975][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 14.165979][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.165981][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.165986][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 14.165990][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.165994][ C2] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 14.165998][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 14.166005][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 14.166008][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 14.166012][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 14.166015][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 14.166017][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.166021][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 14.166024][ C2] kthread (kernel/kthread.c:464) 
[ 14.166027][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.166030][ C2] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 14.166033][ C2] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 14.166037][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.166040][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.166044][ C2] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 14.166047][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.166050][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   14.176295][    C2] RCU nest depth: 0, expected: 0
| [   14.176467][    C2] INFO: lockdep is turned off.
| [   14.176636][    C2] Preemption disabled at:
| [ 14.176638][ C2] handle_softirqs (kernel/softirq.c:553) 
[   14.176991][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.176993][    C2] Call Trace:
[   14.176995][    C2]  <TASK>
[ 14.176997][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.177004][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 14.177010][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 14.177014][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 14.177017][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 14.177022][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.177028][ 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) 
[ 14.177033][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 14.177035][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 14.177039][ 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) 
[ 14.177044][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 14.177047][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 14.177052][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.177055][ 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) 
[ 14.177061][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.177072][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.177074][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.177078][ C2] ? kthread (kernel/kthread.c:464) 
[ 14.177083][ C2] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 14.177088][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 14.177093][ 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) 
[ 14.177098][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 14.177104][ C2] __put_net (net/core/net_namespace.c:732) 
[ 14.177108][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 14.177112][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.177115][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.177119][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 14.177123][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.177127][ C2] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 14.177131][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 14.177138][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 14.177141][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 14.177145][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 14.177148][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 14.177150][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.177154][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 14.177158][ C2] kthread (kernel/kthread.c:464) 
[ 14.177161][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.177164][ C2] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 14.177167][ C2] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 14.177172][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.177176][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.177179][ C2] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 14.177183][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.177185][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   15.688546][    C3] INFO: lockdep is turned off.
| [   15.688694][    C3] Preemption disabled at:
| [ 15.688696][ C3] handle_softirqs (kernel/softirq.c:553) 
| [   15.689013][    C3] Tainted: [W]=WARN
[   15.689015][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.689017][    C3] Call Trace:
[   15.689019][    C3]  <TASK>
[ 15.689021][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.689030][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 15.689037][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.689042][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.689045][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.689051][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.689060][ 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) 
[ 15.689066][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.689068][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.689074][ 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) 
[ 15.689078][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.689081][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.689088][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.689091][ 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) 
[ 15.689099][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.689104][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.689107][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.689112][ C3] ? kthread (kernel/kthread.c:464) 
[ 15.689118][ C3] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 15.689125][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.689132][ 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) 
[ 15.689138][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 15.689141][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 15.689146][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.689150][ C3] __put_net (net/core/net_namespace.c:732) 
[ 15.689155][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 15.689158][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.689161][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.689166][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.689170][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.689174][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 15.689179][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.689183][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 15.689186][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.689189][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.689191][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.689195][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.689198][ C3] kthread (kernel/kthread.c:464) 
[ 15.689201][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.689204][ C3] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 15.689207][ C3] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 15.689213][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.689217][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.689220][ C3] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 15.689223][ 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