======================================
| [   16.316052][    C0] 1 lock held by ksoftirqd/0/14:
| [ 16.316237][ C0] #0: ffffffffb4f774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   16.316569][    C0]
| [   16.316569][    C0] stack backtrace:
[   16.316808][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.316811][    C0] Call Trace:
[   16.316813][    C0]  <TASK>
[ 16.316816][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.316824][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 16.316830][ C0] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 16.316834][ C0] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 16.316840][ C0] ? save_trace (kernel/locking/lockdep.c:595) 
[ 16.316846][ C0] mark_lock (kernel/locking/lockdep.c:4756) 
[ 16.316850][ C0] mark_usage (kernel/locking/lockdep.c:4645) 
[ 16.316853][ C0] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 16.316856][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 16.316860][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 16.316864][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 16.316868][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.316873][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 16.316876][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 16.316880][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 16.316884][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 16.316887][ C0] simple_pin_fs (fs/libfs.c:1067) 
[ 16.316892][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 16.316895][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 16.316904][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.316907][ 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) 
[ 16.316915][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.316918][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.316921][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.316927][ C0] ? kthread (kernel/kthread.c:464) 
[ 16.316930][ C0] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 16.316934][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 16.316937][ 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) 
[ 16.316942][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 16.316947][ C0] __put_net (net/core/net_namespace.c:732) 
[ 16.316952][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.316956][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.316958][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.316963][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.316967][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.316969][ C0] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 16.316973][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 16.316978][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.316982][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 16.316986][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 16.316990][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 16.316993][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.316997][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 16.317001][ C0] kthread (kernel/kthread.c:464) 
[ 16.317004][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.317006][ C0] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 16.317009][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 16.317012][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.317015][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.317018][ C0] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 16.317021][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.317023][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   16.328214][    C0] RCU nest depth: 0, expected: 0
| [   16.328384][    C0] INFO: lockdep is turned off.
| [   16.328551][    C0] Preemption disabled at:
| [ 16.328553][ C0] handle_softirqs (kernel/softirq.c:553) 
[   16.328908][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.328910][    C0] Call Trace:
[   16.328912][    C0]  <TASK>
[ 16.328914][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.328924][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 16.328932][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.328938][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.328941][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 16.328946][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.328952][ 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) 
[ 16.328959][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 16.328962][ 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) 
[ 16.328966][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.328972][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.328975][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 16.328982][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.328985][ 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) 
[ 16.328992][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.328996][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.328999][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.329004][ C0] ? kthread (kernel/kthread.c:464) 
[ 16.329007][ C0] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 16.329012][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 16.329019][ 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) 
[ 16.329024][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 16.329029][ C0] __put_net (net/core/net_namespace.c:732) 
[ 16.329034][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.329040][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.329043][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.329048][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.329052][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.329055][ C0] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 16.329058][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 16.329063][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.329067][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 16.329071][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 16.329075][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 16.329078][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.329082][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 16.329086][ C0] kthread (kernel/kthread.c:464) 
[ 16.329088][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.329090][ C0] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 16.329093][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 16.329097][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.329100][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.329103][ C0] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 16.329106][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.329108][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   18.740620][    C2] INFO: lockdep is turned off.
| [   18.740805][    C2] Preemption disabled at:
| [ 18.740806][ C2] handle_softirqs (kernel/softirq.c:553) 
| [   18.741198][    C2] Tainted: [W]=WARN
[   18.741200][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.741202][    C2] Call Trace:
[   18.741205][    C2]  <TASK>
[ 18.741207][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.741217][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 18.741225][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 18.741231][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 18.741234][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 18.741239][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.741246][ 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) 
[ 18.741254][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 18.741257][ 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) 
[ 18.741260][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 18.741267][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 18.741270][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 18.741277][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 18.741281][ 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) 
[ 18.741287][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.741291][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 18.741294][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 18.741300][ C2] ? kthread (kernel/kthread.c:464) 
[ 18.741303][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 18.741308][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 18.741316][ 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) 
[ 18.741320][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 18.741323][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 18.741329][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.741334][ C2] __put_net (net/core/net_namespace.c:732) 
[ 18.741338][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 18.741342][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.741345][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.741350][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 18.741354][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.741356][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 18.741365][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 18.741370][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 18.741375][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 18.741378][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 18.741381][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 18.741385][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 18.741389][ C2] kthread (kernel/kthread.c:464) 
[ 18.741392][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.741394][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 18.741397][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 18.741401][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.741404][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.741407][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 18.741410][ C2] ? __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