======================================
| [   14.247246][    C0] 1 lock held by swapper/0/0:
| [ 14.247473][ C0] #0: ffffffff8b5749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   14.247884][    C0]
| [   14.247884][    C0] stack backtrace:
[   14.248172][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.248174][    C0] Call Trace:
[   14.248176][    C0]  <IRQ>
[ 14.248178][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.248186][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 14.248190][ C0] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 14.248194][ C0] ? is_bpf_text_address (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 kernel/bpf/core.c:774) 
[ 14.248199][ C0] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 14.248202][ C0] ? save_trace (kernel/locking/lockdep.c:594) 
[ 14.248209][ C0] mark_lock (kernel/locking/lockdep.c:4754) 
[ 14.248213][ C0] mark_usage (kernel/locking/lockdep.c:4643) 
[ 14.248216][ C0] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 14.248220][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 14.248223][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.248226][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.248230][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 14.248232][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.248236][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 14.248239][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.248241][ C0] simple_pin_fs (fs/libfs.c:1066) 
[ 14.248245][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 14.248248][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 14.248255][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.248259][ 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:2366) 
[ 14.248265][ C0] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 14.248269][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.248272][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 14.248275][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 14.248280][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.248283][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.248287][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.248289][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.248292][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.248296][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 14.248298][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.248300][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 14.248303][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 14.248310][ C0] __put_net (net/core/net_namespace.c:732) 
[ 14.248314][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 14.248318][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.248322][ C0] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 14.248326][ C0] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 14.248331][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 14.248335][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 14.248338][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 14.248342][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 14.248346][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 14.248350][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 14.248355][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 14.248358][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 14.248361][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   14.248364][    C0]  </IRQ>
[   14.248365][    C0]  <TASK>
[ 14.248367][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.248370][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.248374][ C0] Code: 50 b7 00 e9 c3 57 02 00 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 c3 45 12 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	50                   	push   %rax
   1:	b7 00                	mov    $0x0,%bh
   3:	e9 c3 57 02 00       	jmp    0x257cb
   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 c3 45 12 00 	verw   0x1245c3(%rip)        # 0x1245eb
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	cc                   	int3
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  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:	c3                   	ret
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   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
[   14.248378][    C0] RSP: 0018:ffffffff8b207df8 EFLAGS: 00000242
[   14.248381][    C0] RAX: 0000000000061a0b RBX: 1ffffffff1640fc3 RCX: ffffffff8a56ea19
[   14.248383][    C0] RDX: 0000000000000000 RSI: ffffffff8b089a45 RDI: ffffffff8a8513a0
[   14.248385][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c0667a
[   14.248387][    C0] R10: ffff8880360333d3 R11: 0000000000000000 R12: 0000000000000000
[   14.248389][    C0] R13: ffffffff8b21f240 R14: dffffc0000000000 R15: 0000000000014770
[ 14.248393][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 14.248399][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.248401][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.248403][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.248406][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 14.248410][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 14.248416][ C0] do_idle (kernel/sched/idle.c:325) 
[ 14.248419][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.248422][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 14.248425][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 14.248429][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:501) 
[ 14.248434][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:443 (discriminator 17)) 
[ 14.248438][ C0] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   14.269504][    C0] RCU nest depth: 0, expected: 0
| [   14.269835][    C0] INFO: lockdep is turned off.
| [   14.270060][    C0] Preemption disabled at:
| [ 14.270062][ C0] schedule_preempt_disabled (kernel/sched/core.c:6919) 
[   14.270708][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.270710][    C0] Call Trace:
[   14.270712][    C0]  <IRQ>
[ 14.270713][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.270721][ C0] __might_resched (kernel/sched/core.c:8819) 
[ 14.270730][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 14.270733][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 14.270736][ C0] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 14.270742][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.270747][ 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) 
[ 14.270753][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 14.270757][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 14.270762][ 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) 
[ 14.270767][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 14.270771][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 14.270778][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.270781][ 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:2366) 
[ 14.270787][ C0] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 14.270792][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.270795][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 14.270801][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 14.270806][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.270810][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.270813][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.270816][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.270818][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.270822][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 14.270824][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.270827][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 14.270829][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 14.270838][ C0] __put_net (net/core/net_namespace.c:732) 
[ 14.270842][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 14.270846][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.270850][ C0] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 14.270854][ C0] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 14.270860][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 14.270864][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 14.270870][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 14.270873][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 14.270879][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 14.270885][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 14.270894][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 14.270899][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 14.270903][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   14.270908][    C0]  </IRQ>
[   14.270909][    C0]  <TASK>
[ 14.270911][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.270913][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.270918][ C0] Code: 50 b7 00 e9 c3 57 02 00 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 c3 45 12 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	50                   	push   %rax
   1:	b7 00                	mov    $0x0,%bh
   3:	e9 c3 57 02 00       	jmp    0x257cb
   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 c3 45 12 00 	verw   0x1245c3(%rip)        # 0x1245eb
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	cc                   	int3
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  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:	c3                   	ret
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   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
[   14.270921][    C0] RSP: 0018:ffffffff8b207df8 EFLAGS: 00000242
[   14.270925][    C0] RAX: 0000000000061a0b RBX: 1ffffffff1640fc3 RCX: ffffffff8a56ea19
[   14.270927][    C0] RDX: 0000000000000000 RSI: ffffffff8b089a45 RDI: ffffffff8a8513a0
[   14.270929][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c0667a
[   14.270931][    C0] R10: ffff8880360333d3 R11: 0000000000000000 R12: 0000000000000000
[   14.270933][    C0] R13: ffffffff8b21f240 R14: dffffc0000000000 R15: 0000000000014770
[ 14.270937][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 14.270943][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.270945][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.270947][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.270950][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 14.270954][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 14.270959][ C0] do_idle (kernel/sched/idle.c:325) 
[ 14.270963][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.270965][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 14.270968][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 14.270973][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:501) 
[ 14.270978][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:443 (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