======================================
| [ 2904.020617][    C2] 1 lock held by ksoftirqd/2/27:
| [ 2904.020793][ C2] #0: ffffffff9038d440 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [ 2904.021099][    C2]
| [ 2904.021099][    C2] stack backtrace:
[ 2904.021324][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 2904.021327][    C2] Call Trace:
[ 2904.021331][    C2]  <TASK>
[ 2904.021333][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 2904.021342][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 2904.021347][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 2904.021351][ C2] ? stack_depot_save_flags (lib/stackdepot.c:552 lib/stackdepot.c:619) 
[ 2904.021357][ C2] ? validate_chain (kernel/locking/lockdep.c:3804 kernel/locking/lockdep.c:3824 kernel/locking/lockdep.c:3879) 
[ 2904.021363][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 2904.021367][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 2904.021370][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 2904.021373][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 2904.021378][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 2904.021382][ C2] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 2904.021386][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 2904.021392][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 2904.021395][ C2] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 2904.021400][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 2904.021403][ C2] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 2904.021406][ C2] xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 2904.021409][ C2] ? __pfx_xa_set_mark (lib/xarray.c:2144) 
[ 2904.021413][ C2] ? trace_rcu_segcb_stats (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745 ./include/trace/events/rcu.h:537) 
[ 2904.021417][ C2] ? kasan_quarantine_put (mm/kasan/quarantine.c:234 (discriminator 1)) 
[ 2904.021420][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 2904.021425][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:54 lib/ref_tracker.c:223) 
[ 2904.021428][ C2] ? ref_tracker_free (lib/ref_tracker.c:281) 
[ 2904.021431][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:213) 
[ 2904.021434][ C2] ? ref_tracker_free (lib/ref_tracker.c:281) 
[ 2904.021436][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 2904.021440][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:281) 
[ 2904.021442][ 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:2368) 
[ 2904.021456][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 2904.021458][ C2] ? rcu_core (kernel/rcu/tree.c:2834) 
[ 2904.021462][ C2] ? handle_softirqs (kernel/softirq.c:579) 
[ 2904.021466][ C2] __put_net (./include/linux/llist.h:238 ./include/linux/llist.h:265 net/core/net_namespace.c:732) 
[ 2904.021472][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 2904.021481][ C2] ? __pfx___put_net (net/core/net_namespace.c:729) 
[ 2904.021485][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 2904.021495][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2368) 
[ 2904.021500][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 2904.021502][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 2904.021507][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 2904.021511][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 2904.021514][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 2904.021517][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 2904.021522][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 2904.021525][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 2904.021530][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 2904.021534][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 2904.021537][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 2904.021542][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 2904.021545][ C2] kthread (kernel/kthread.c:464) 
[ 2904.021550][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 2904.021553][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 2904.021555][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 2904.021559][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 2904.021562][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 2904.021566][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 2904.021568][ C2] ? __pfx_kthread (kernel/kthread.c:413) 


Finger prints:
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock