======================================
| [   15.538368][    C2] 1 lock held by ksoftirqd/2/27:
| [ 15.538553][ C2] #0: ffffffff909793c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   15.538912][    C2]
| [   15.538912][    C2] stack backtrace:
[   15.539154][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.539156][    C2] Call Trace:
[   15.539157][    C2]  <TASK>
[ 15.539160][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.539168][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 15.539176][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 15.539188][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 15.539193][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 15.539197][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 15.539201][ C2] ? unwind_next_frame (./include/linux/rcupdate.h:874 ./include/linux/rcupdate.h:1155 arch/x86/kernel/unwind_orc.c:479) 
[ 15.539210][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.539217][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 15.539222][ C2] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 15.539228][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.539234][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 15.539238][ C2] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 15.539244][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.539250][ C2] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 15.539255][ C2] xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 15.539260][ C2] ? __pfx_xa_set_mark (lib/xarray.c:2144) 
[ 15.539264][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 15.539270][ C2] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 15.539274][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:54 lib/ref_tracker.c:223) 
[ 15.539281][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.539285][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:213) 
[ 15.539289][ C2] ? ref_tracker_free (lib/ref_tracker.c:281) 
[ 15.539292][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 15.539295][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:281) 
[ 15.539298][ 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) 
[ 15.539303][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 15.539307][ C2] ? rcu_core (kernel/rcu/tree.c:2834) 
[ 15.539309][ C2] ? handle_softirqs (kernel/softirq.c:580) 
[ 15.539315][ C2] __put_net (./include/linux/llist.h:238 ./include/linux/llist.h:265 net/core/net_namespace.c:732) 
[ 15.539319][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 15.539324][ C2] ? __pfx___put_net (net/core/net_namespace.c:729) 
[ 15.539328][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 15.539333][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2368) 
[ 15.539337][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.539340][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 15.539344][ C2] ? __schedule (kernel/sched/core.c:6662) 
[ 15.539349][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.539353][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.539355][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 15.539359][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.539365][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.539368][ C2] handle_softirqs (kernel/softirq.c:580) 
[ 15.539371][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.539375][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.539377][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.539381][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.539385][ C2] kthread (kernel/kthread.c:464) 
[ 15.539389][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.539392][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 15.539394][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 15.539397][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.539400][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.539403][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.539406][ C2] ? __pfx_kthread (kernel/kthread.c:413) 


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