======================================
| [   15.329870][    C2] 1 lock held by swapper/2/0:
| [ 15.330062][ C2] #0: ffffffffa81793c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   15.330396][    C2]
| [   15.330396][    C2] stack backtrace:
[   15.330631][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.330633][    C2] Call Trace:
[   15.330635][    C2]  <IRQ>
[ 15.330637][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.330643][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 15.330648][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 15.330655][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 15.330659][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 15.330663][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 15.330666][ C2] ? unwind_next_frame (./include/linux/rcupdate.h:874 ./include/linux/rcupdate.h:1155 arch/x86/kernel/unwind_orc.c:479) 
[ 15.330672][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.330677][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 15.330681][ C2] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 15.330684][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.330689][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 15.330692][ C2] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 15.330696][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.330699][ C2] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 15.330701][ C2] xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 15.330704][ C2] ? __pfx_xa_set_mark (lib/xarray.c:2144) 
[ 15.330707][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 15.330712][ C2] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 15.330716][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:54 lib/ref_tracker.c:223) 
[ 15.330720][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.330724][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:213) 
[ 15.330728][ C2] ? ref_tracker_free (lib/ref_tracker.c:281) 
[ 15.330731][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 15.330734][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:281) 
[ 15.330738][ 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) 
[ 15.330742][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 15.330745][ C2] ? rcu_core (kernel/rcu/tree.c:2834) 
[ 15.330747][ C2] ? handle_softirqs (kernel/softirq.c:580) 
[ 15.330752][ C2] __put_net (./include/linux/llist.h:238 ./include/linux/llist.h:265 net/core/net_namespace.c:732) 
[ 15.330756][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.330760][ C2] ? __pfx___put_net (net/core/net_namespace.c:729) 
[ 15.330764][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 15.330768][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2368) 
[ 15.330772][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.330775][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 15.330780][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.330783][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 15.330787][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.330790][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.330795][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.330798][ C2] handle_softirqs (kernel/softirq.c:580) 
[ 15.330803][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.330807][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.330810][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   15.330814][    C2]  </IRQ>
[   15.330815][    C2]  <TASK>
[ 15.330817][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.330820][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 15.330825][ C2] Code: 64 b3 00 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 53 a7 0c 00 fb f4 <e9> cc 58 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	64 b3 00             	fs mov $0x0,%bl
   3:	c3                   	ret
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	0f 1f 00             	nopl   (%rax)
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d 53 a7 0c 00 	verw   0xca753(%rip)        # 0xca77b
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	e9 cc 58 02 00       	jmp    0x258fb		<-- trapping instruction
  2f:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  36:	00 00 00 
  39:	66 90                	xchg   %ax,%ax
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	e9 cc 58 02 00       	jmp    0x258d1
   5:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   c:	00 00 00 
   f:	66 90                	xchg   %ax,%ax
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[   15.330828][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   15.330831][    C2] RAX: 000000000003bbcf RBX: 1ffff92000028fc1 RCX: ffffffffa71ca3c9
[   15.330833][    C2] RDX: 0000000000000000 RSI: ffffffffa7ca57e9 RDI: ffffffffa745a220
[   15.330835][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c26702
[   15.330836][    C2] R10: ffff888036133813 R11: ffffffffa7e11288 R12: 0000000000000000
[   15.330838][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 15.330842][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.330847][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 15.330850][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.330852][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.330856][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.330860][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 15.330865][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.330869][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.330872][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.330875][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 


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