======================================
| [   30.034562][    C2] 1 lock held by ksoftirqd/2/27:
| [ 30.034927][ C2] #0: ffffffffaff774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   30.035562][    C2]
| [   30.035562][    C2] stack backtrace:
[   30.036002][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   30.036005][    C2] Call Trace:
[   30.036008][    C2]  <TASK>
[ 30.036012][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 30.036023][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 30.036033][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 30.036040][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 30.036047][ C2] ? save_trace (kernel/locking/lockdep.c:595) 
[ 30.036053][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 30.036059][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 30.036064][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 30.036069][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 30.036076][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 30.036080][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 30.036087][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 30.036095][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 30.036099][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 30.036104][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 30.036111][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 30.036115][ C2] simple_pin_fs (fs/libfs.c:1067) 
[ 30.036120][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 30.036126][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 30.036132][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 30.036136][ 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:2376) 
[ 30.036143][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 30.036148][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 30.036152][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 30.036156][ C2] ? kthread (kernel/kthread.c:464) 
[ 30.036160][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 30.036166][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 30.036172][ C2] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 30.036178][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 30.036186][ C2] __put_net (net/core/net_namespace.c:732) 
[ 30.036192][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 30.036197][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 30.036201][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 30.036209][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 30.036214][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 30.036219][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 30.036223][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 30.036232][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 30.036239][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 30.036248][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 30.036254][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 30.036258][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 30.036262][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 30.036267][ C2] kthread (kernel/kthread.c:464) 
[ 30.036272][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 30.036275][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 30.036279][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 30.036284][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 30.036289][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 30.036294][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 30.036298][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 30.036302][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   30.062815][    C2] RCU nest depth: 0, expected: 0
| [   30.063221][    C2] INFO: lockdep is turned off.
| [   30.063639][    C2] Preemption disabled at:
| [ 30.063643][ C2] handle_softirqs (kernel/softirq.c:553) 
[   30.064764][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   30.064768][    C2] Call Trace:
[   30.064771][    C2]  <TASK>
[ 30.064775][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 30.064787][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 30.064799][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 30.064806][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 30.064811][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 30.064818][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 30.064827][ 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) 
[ 30.064835][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 30.064840][ 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) 
[ 30.064845][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 30.064855][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 30.064861][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 30.064868][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 30.064873][ 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:2376) 
[ 30.064881][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 30.064888][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 30.064893][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 30.064898][ C2] ? kthread (kernel/kthread.c:464) 
[ 30.064904][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 30.064910][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 30.064916][ C2] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 30.064922][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 30.064934][ C2] __put_net (net/core/net_namespace.c:732) 
[ 30.064941][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 30.064948][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 30.064953][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 30.064963][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 30.064970][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 30.064976][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 30.064981][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 30.064992][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 30.065000][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 30.065010][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 30.065017][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 30.065023][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 30.065028][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 30.065035][ C2] kthread (kernel/kthread.c:464) 
[ 30.065041][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 30.065045][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 30.065050][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 30.065059][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 30.065064][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 30.065070][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 30.065075][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 30.065080][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   31.336344][    C1] INFO: lockdep is turned off.
| [   31.336750][    C1] Preemption disabled at:
| [ 31.336754][ C1] handle_softirqs (kernel/softirq.c:553) 
| [   31.337522][    C1] Tainted: [W]=WARN
[   31.337525][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   31.337528][    C1] Call Trace:
[   31.337531][    C1]  <TASK>
[ 31.337535][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 31.337547][ C1] __might_resched (kernel/sched/core.c:8796) 
[ 31.337561][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 31.337568][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 31.337573][ C1] ? simple_recursive_removal (fs/libfs.c:614) 
[ 31.337581][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 31.337588][ C1] ? 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) 
[ 31.337595][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 31.337600][ C1] ? 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) 
[ 31.337604][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 31.337613][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 31.337618][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 31.337645][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 31.337650][ C1] ? __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) 
[ 31.337657][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 31.337676][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 31.337680][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 31.337685][ C1] ? kthread (kernel/kthread.c:464) 
[ 31.337692][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 31.337699][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 31.337704][ C1] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 31.337711][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 31.337717][ C1] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 31.337723][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 31.337732][ C1] __put_net (net/core/net_namespace.c:732) 
[ 31.337738][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 31.337745][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 31.337749][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 31.337759][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 31.337766][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 31.337771][ C1] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 31.337781][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 31.337788][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 31.337797][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 31.337804][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 31.337809][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 31.337814][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 31.337821][ C1] kthread (kernel/kthread.c:464) 
[ 31.337827][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 31.337831][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 31.337836][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 31.337844][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 31.337849][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 31.337855][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 31.337860][ C1] ? __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