======================================
| [   15.892844][    C2] 1 lock held by ksoftirqd/2/27:
| [ 15.893018][ C2] #0: ffffffffa2b774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   15.893325][    C2]
| [   15.893325][    C2] stack backtrace:
[   15.893540][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.893542][    C2] Call Trace:
[   15.893544][    C2]  <TASK>
[ 15.893547][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.893553][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 15.893557][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 15.893562][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.893567][ C2] ? save_trace (kernel/locking/lockdep.c:595) 
[ 15.893572][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 15.893576][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 15.893579][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 15.893582][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 15.893586][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 15.893589][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.893594][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.893598][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 15.893600][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.893605][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.893608][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.893611][ C2] simple_pin_fs (fs/libfs.c:1067) 
[ 15.893615][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.893618][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 15.893624][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.893628][ 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) 
[ 15.893634][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.893636][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.893640][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.893644][ C2] ? kthread (kernel/kthread.c:464) 
[ 15.893647][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.893650][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.893653][ 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) 
[ 15.893657][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 15.893662][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.893666][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.893670][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.893673][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.893678][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.893681][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.893684][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 15.893687][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.893691][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.893695][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.893699][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.893703][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.893705][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.893709][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.893713][ C2] kthread (kernel/kthread.c:464) 
[ 15.893716][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.893718][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 15.893720][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 15.893724][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.893727][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.893730][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.893732][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.893734][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   15.904038][    C2] RCU nest depth: 0, expected: 0
| [   15.904217][    C2] INFO: lockdep is turned off.
| [   15.904391][    C2] Preemption disabled at:
| [ 15.904393][ C2] handle_softirqs (kernel/softirq.c:553) 
[   15.904740][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.904742][    C2] Call Trace:
[   15.904743][    C2]  <TASK>
[ 15.904746][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.904752][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 15.904758][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.904762][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.904765][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 15.904770][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.904774][ 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) 
[ 15.904780][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 15.904782][ 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) 
[ 15.904786][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.904791][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.904794][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 15.904799][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.904803][ 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) 
[ 15.904807][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.904810][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.904813][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.904817][ C2] ? kthread (kernel/kthread.c:464) 
[ 15.904820][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.904824][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.904829][ 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) 
[ 15.904833][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 15.904838][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.904842][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.904846][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.904849][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.904853][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.904857][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.904859][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 15.904862][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.904866][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.904870][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.904875][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.904878][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.904881][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.904885][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.904889][ C2] kthread (kernel/kthread.c:464) 
[ 15.904892][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.904894][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 15.904897][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 15.904900][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.904903][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.904906][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.904909][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.904912][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   18.031178][    C3] INFO: lockdep is turned off.
| [   18.031340][    C3] Preemption disabled at:
| [ 18.031342][ C3] handle_softirqs (kernel/softirq.c:553) 
| [   18.031674][    C3] Tainted: [W]=WARN
[   18.031675][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.031677][    C3] Call Trace:
[   18.031679][    C3]  <TASK>
[ 18.031681][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.031689][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 18.031696][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 18.031700][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 18.031703][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 18.031707][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.031713][ 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) 
[ 18.031719][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 18.031722][ 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) 
[ 18.031725][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 18.031731][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 18.031734][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 18.031740][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 18.031744][ 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:2376) 
[ 18.031749][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.031753][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 18.031756][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 18.031760][ C3] ? kthread (kernel/kthread.c:464) 
[ 18.031763][ C3] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 18.031767][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 18.031773][ C3] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 18.031776][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 18.031780][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 18.031784][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.031788][ C3] __put_net (net/core/net_namespace.c:732) 
[ 18.031792][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 18.031796][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.031798][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.031803][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 18.031807][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.031809][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 18.031817][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 18.031821][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 18.031825][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 18.031829][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 18.031831][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 18.031836][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 18.031840][ C3] kthread (kernel/kthread.c:464) 
[ 18.031843][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.031845][ C3] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 18.031847][ C3] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 18.031851][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.031854][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.031857][ C3] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 18.031860][ 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