======================================
| [   12.949778][    C2] 1 lock held by swapper/2/0:
| [ 12.949990][ C2] #0: ffffffffb91793c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   12.950367][    C2]
| [   12.950367][    C2] stack backtrace:
[   12.950631][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.950633][    C2] Call Trace:
[   12.950635][    C2]  <IRQ>
[ 12.950638][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 12.950644][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 12.950649][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 12.950655][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 12.950658][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 12.950661][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 12.950664][ C2] ? unwind_next_frame (./include/linux/rcupdate.h:874 ./include/linux/rcupdate.h:1155 arch/x86/kernel/unwind_orc.c:479) 
[ 12.950669][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 12.950675][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 12.950678][ C2] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 12.950681][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 12.950684][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 12.950687][ C2] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 12.950690][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 12.950693][ C2] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 12.950696][ C2] xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 12.950698][ C2] ? __pfx_xa_set_mark (lib/xarray.c:2144) 
[ 12.950700][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 12.950705][ C2] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 12.950710][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:54 lib/ref_tracker.c:223) 
[ 12.950716][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 12.950719][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:213) 
[ 12.950724][ C2] ? ref_tracker_free (lib/ref_tracker.c:281) 
[ 12.950727][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 12.950730][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:281) 
[ 12.950734][ 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) 
[ 12.950739][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 12.950742][ C2] ? rcu_core (kernel/rcu/tree.c:2834) 
[ 12.950745][ C2] ? handle_softirqs (kernel/softirq.c:580) 
[ 12.950749][ C2] __put_net (./include/linux/llist.h:238 ./include/linux/llist.h:265 net/core/net_namespace.c:732) 
[ 12.950754][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 12.950758][ C2] ? __pfx___put_net (net/core/net_namespace.c:729) 
[ 12.950762][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 12.950768][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2368) 
[ 12.950771][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.950774][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 12.950780][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 12.950783][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 12.950786][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 12.950789][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 12.950793][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 12.950796][ C2] handle_softirqs (kernel/softirq.c:580) 
[ 12.950801][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 12.950804][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 12.950806][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   12.950811][    C2]  </IRQ>
[   12.950812][    C2]  <TASK>
[ 12.950813][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.950817][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.950821][ C2] Code: 64 d2 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 87 2b 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 d2 00             	rolb   %cl,%fs:(%rax)
   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 87 2b 00 	verw   0x2b8753(%rip)        # 0x2b877b
  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
[   12.950824][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000242
[   12.950827][    C2] RAX: 000000000003ae73 RBX: 1ffff92000028fc1 RCX: ffffffffb7fdc3c9
[   12.950829][    C2] RDX: 0000000000000000 RSI: ffffffffb8ca76e1 RDI: ffffffffb845a2e0
[   12.950831][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c26702
[   12.950832][    C2] R10: ffff888036133813 R11: ffffffffb8e11288 R12: 0000000000000000
[   12.950834][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 12.950837][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 12.950843][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.950846][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.950848][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.950852][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 12.950857][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 12.950862][ C2] do_idle (kernel/sched/idle.c:325) 
[ 12.950866][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.950870][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 12.950874][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 


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