======================================
| [   15.803546][    C2] 1 lock held by ksoftirqd/2/27:
| [ 15.803741][ C2] #0: ffffffff9a9793c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   15.804090][    C2]
| [   15.804090][    C2] stack backtrace:
[   15.804338][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.804341][    C2] Call Trace:
[   15.804343][    C2]  <TASK>
[ 15.804345][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.804352][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 15.804358][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 15.804365][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 15.804369][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 15.804373][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 15.804376][ C2] ? unwind_next_frame (./include/linux/rcupdate.h:874 ./include/linux/rcupdate.h:1155 arch/x86/kernel/unwind_orc.c:479) 
[ 15.804382][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.804386][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 15.804390][ C2] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 15.804393][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.804399][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 15.804402][ C2] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 15.804406][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.804409][ C2] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 15.804412][ C2] xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 15.804415][ C2] ? __pfx_xa_set_mark (lib/xarray.c:2144) 
[ 15.804417][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 15.804423][ C2] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 15.804427][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:54 lib/ref_tracker.c:223) 
[ 15.804433][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.804437][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:213) 
[ 15.804441][ C2] ? ref_tracker_free (lib/ref_tracker.c:281) 
[ 15.804444][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 15.804448][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:281) 
[ 15.804451][ 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) 
[ 15.804455][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 15.804458][ C2] ? rcu_core (kernel/rcu/tree.c:2834) 
[ 15.804460][ C2] ? handle_softirqs (kernel/softirq.c:580) 
[ 15.804466][ C2] __put_net (./include/linux/llist.h:238 ./include/linux/llist.h:265 net/core/net_namespace.c:732) 
[ 15.804471][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 15.804477][ C2] ? __pfx___put_net (net/core/net_namespace.c:729) 
[ 15.804481][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 15.804486][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2368) 
[ 15.804489][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.804492][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 15.804497][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.804501][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.804505][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 15.804508][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.804513][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.804519][ C2] handle_softirqs (kernel/softirq.c:580) 
[ 15.804531][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.804539][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.804542][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.804552][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.804559][ C2] kthread (kernel/kthread.c:464) 
[ 15.804564][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.804566][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 15.804570][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 15.804574][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.804577][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.804581][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.804584][ C2] ? __pfx_kthread (kernel/kthread.c:413) 


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