======================================
| [   12.409611][    C0] 1 lock held by swapper/0/0:
| [ 12.409820][ C0] #0: ffffffff95f774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   12.410189][    C0]
| [   12.410189][    C0] stack backtrace:
[   12.410448][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.410450][    C0] Call Trace:
[   12.410452][    C0]  <IRQ>
[ 12.410454][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 12.410460][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 12.410465][ C0] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 12.410468][ C0] ? is_bpf_text_address (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 kernel/bpf/core.c:774) 
[ 12.410473][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 12.410478][ C0] ? save_trace (kernel/locking/lockdep.c:595) 
[ 12.410482][ C0] mark_lock (kernel/locking/lockdep.c:4756) 
[ 12.410486][ C0] mark_usage (kernel/locking/lockdep.c:4645) 
[ 12.410489][ C0] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 12.410493][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 12.410497][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 12.410500][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 12.410504][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 12.410509][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 12.410512][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 12.410515][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 12.410519][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 12.410521][ C0] simple_pin_fs (fs/libfs.c:1067) 
[ 12.410525][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 12.410528][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 12.410532][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 12.410535][ C0] ? __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:2376) 
[ 12.410541][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.410544][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 12.410546][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 12.410549][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 12.410554][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.410557][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.410560][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.410563][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.410566][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.410570][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 12.410572][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.410575][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 12.410578][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 12.410583][ C0] __put_net (net/core/net_namespace.c:732) 
[ 12.410587][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 12.410591][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.410594][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.410598][ C0] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 12.410601][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 12.410605][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 12.410608][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 12.410612][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 12.410617][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 12.410621][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 12.410627][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 12.410630][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 12.410633][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   12.410637][    C0]  </IRQ>
[   12.410638][    C0]  <TASK>
[ 12.410639][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.410642][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.410646][ C0] Code: 92 b4 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 83 07 0f 00 fb f4 <e9> fc 54 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	92                   	xchg   %eax,%edx
   1:	b4 00                	mov    $0x0,%ah
   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 83 07 0f 00 	verw   0xf0783(%rip)        # 0xf07ab
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	e9 fc 54 02 00       	jmp    0x2552b		<-- 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 fc 54 02 00       	jmp    0x25501
   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
[   12.410649][    C0] RSP: 0018:ffffffff95c07df8 EFLAGS: 00000242
[   12.410652][    C0] RAX: 0000000000060cb5 RBX: 1ffffffff2b80fc3 RCX: ffffffff94fa35d9
[   12.410654][    C0] RDX: 0000000000000000 RSI: ffffffff95a9175c RDI: ffffffff95253ca0
[   12.410656][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005e866fa
[   12.410657][    C0] R10: ffff88802f4337d3 R11: ffffffff95c11288 R12: 0000000000000000
[   12.410659][    C0] R13: ffffffff95c1f240 R14: dffffc0000000000 R15: 0000000000014770
[ 12.410663][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 12.410667][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.410670][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.410672][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.410676][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 12.410679][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 12.410684][ C0] do_idle (kernel/sched/idle.c:325) 
[ 12.410688][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.410691][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 12.410695][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 12.410699][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:295) 
[ 12.410703][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:231 (discriminator 17)) 
[ 12.410707][ C0] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   12.428606][    C0] RCU nest depth: 0, expected: 0
| [   12.428800][    C0] INFO: lockdep is turned off.
| [   12.428993][    C0] Preemption disabled at:
| [ 12.428995][ C0] schedule_preempt_disabled (kernel/sched/core.c:6933) 
[   12.429443][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.429444][    C0] Call Trace:
[   12.429446][    C0]  <IRQ>
[ 12.429448][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 12.429453][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 12.429461][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 12.429464][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 12.429467][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 12.429472][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 12.429478][ C0] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 12.429482][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 12.429485][ C0] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 12.429487][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 12.429492][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 12.429495][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 12.429500][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 12.429503][ C0] ? __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:2376) 
[ 12.429507][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.429511][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 12.429513][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 12.429518][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 12.429522][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.429526][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.429529][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.429532][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.429534][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.429538][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 12.429541][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.429543][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 12.429546][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 12.429553][ C0] __put_net (net/core/net_namespace.c:732) 
[ 12.429557][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 12.429561][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.429564][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.429567][ C0] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 12.429571][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 12.429575][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 12.429580][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 12.429583][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 12.429588][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 12.429592][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 12.429598][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 12.429601][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 12.429604][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   12.429608][    C0]  </IRQ>
[   12.429609][    C0]  <TASK>
[ 12.429610][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.429613][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.429616][ C0] Code: 92 b4 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 83 07 0f 00 fb f4 <e9> fc 54 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	92                   	xchg   %eax,%edx
   1:	b4 00                	mov    $0x0,%ah
   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 83 07 0f 00 	verw   0xf0783(%rip)        # 0xf07ab
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	e9 fc 54 02 00       	jmp    0x2552b		<-- 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 fc 54 02 00       	jmp    0x25501
   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
[   12.429619][    C0] RSP: 0018:ffffffff95c07df8 EFLAGS: 00000242
[   12.429622][    C0] RAX: 0000000000060cb5 RBX: 1ffffffff2b80fc3 RCX: ffffffff94fa35d9
[   12.429624][    C0] RDX: 0000000000000000 RSI: ffffffff95a9175c RDI: ffffffff95253ca0
[   12.429626][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005e866fa
[   12.429627][    C0] R10: ffff88802f4337d3 R11: ffffffff95c11288 R12: 0000000000000000
[   12.429629][    C0] R13: ffffffff95c1f240 R14: dffffc0000000000 R15: 0000000000014770
[ 12.429633][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 12.429638][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.429641][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.429643][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.429647][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 12.429651][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 12.429656][ C0] do_idle (kernel/sched/idle.c:325) 
[ 12.429660][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.429663][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 12.429666][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 12.429670][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:295) 
[ 12.429675][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:231 (discriminator 17)) 


Finger prints:
schedule_preempt_disabled:dump_stack_lvl:__might_resched:down_write:simple_recursive_removal
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock