======================================
| [   15.490361][    C0] 1 lock held by swapper/0/0:
| [ 15.490571][ C0] #0: ffffffffb6b774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   15.490954][    C0]
| [   15.490954][    C0] stack backtrace:
[   15.491228][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.491231][    C0] Call Trace:
[   15.491232][    C0]  <IRQ>
[ 15.491234][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.491242][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 15.491248][ C0] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 15.491252][ C0] ? is_bpf_text_address (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 kernel/bpf/core.c:774) 
[ 15.491259][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 15.491264][ C0] ? save_trace (kernel/locking/lockdep.c:595) 
[ 15.491268][ C0] mark_lock (kernel/locking/lockdep.c:4756) 
[ 15.491272][ C0] mark_usage (kernel/locking/lockdep.c:4645) 
[ 15.491276][ C0] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 15.491279][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 15.491283][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 15.491287][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.491291][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.491298][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 15.491301][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.491304][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.491308][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.491310][ C0] simple_pin_fs (fs/libfs.c:1067) 
[ 15.491313][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.491318][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 15.491324][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 15.491327][ 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) 
[ 15.491334][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.491337][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 15.491340][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.491344][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 15.491349][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.491354][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 15.491357][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 15.491360][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.491362][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.491368][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 15.491370][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.491373][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 15.491376][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 15.491383][ C0] __put_net (net/core/net_namespace.c:732) 
[ 15.491389][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.491393][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.491396][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.491399][ C0] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 15.491403][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.491407][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.491410][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.491414][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.491419][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.491424][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 15.491430][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.491434][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.491437][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   15.491440][    C0]  </IRQ>
[   15.491441][    C0]  <TASK>
[ 15.491443][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.491446][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 15.491450][ 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
[   15.491453][    C0] RSP: 0018:ffffffffb6807df8 EFLAGS: 00000246
[   15.491456][    C0] RAX: 0000000000064a4b RBX: 1ffffffff6d00fc3 RCX: ffffffffb5ba35d9
[   15.491458][    C0] RDX: 0000000000000000 RSI: ffffffffb669175c RDI: ffffffffb5e53ca0
[   15.491460][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005e866fa
[   15.491461][    C0] R10: ffff88802f4337d3 R11: ffffffffb6811288 R12: 0000000000000000
[   15.491463][    C0] R13: ffffffffb681f240 R14: dffffc0000000000 R15: 0000000000014770
[ 15.491467][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.491472][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 15.491474][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.491477][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.491480][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.491484][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 15.491492][ C0] do_idle (kernel/sched/idle.c:325) 
[ 15.491496][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.491499][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 15.491502][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 15.491506][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:295) 
[ 15.491512][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:231 (discriminator 17)) 
[ 15.491516][ C0] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.510858][    C0] RCU nest depth: 0, expected: 0
| [   15.511071][    C0] INFO: lockdep is turned off.
| [   15.511264][    C0] Preemption disabled at:
| [ 15.511266][ C0] schedule_preempt_disabled (kernel/sched/core.c:6933) 
[   15.511839][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.511841][    C0] Call Trace:
[   15.511843][    C0]  <IRQ>
[ 15.511845][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.511851][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 15.511860][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.511864][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.511867][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 15.511872][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.511878][ 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) 
[ 15.511882][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 15.511885][ 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) 
[ 15.511890][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.511896][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.511900][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 15.511904][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 15.511907][ 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) 
[ 15.511912][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.511916][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 15.511919][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.511924][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 15.511928][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.511932][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 15.511935][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 15.511938][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.511940][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.511945][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 15.511947][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.511950][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 15.511952][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 15.511961][ C0] __put_net (net/core/net_namespace.c:732) 
[ 15.511965][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.511969][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.511972][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.511975][ C0] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 15.511981][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.511986][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.511992][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.511998][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.512005][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.512012][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 15.512019][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.512022][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.512025][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   15.512029][    C0]  </IRQ>
[   15.512030][    C0]  <TASK>
[ 15.512032][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.512035][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 15.512039][ 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
[   15.512041][    C0] RSP: 0018:ffffffffb6807df8 EFLAGS: 00000246
[   15.512045][    C0] RAX: 0000000000064a4b RBX: 1ffffffff6d00fc3 RCX: ffffffffb5ba35d9
[   15.512047][    C0] RDX: 0000000000000000 RSI: ffffffffb669175c RDI: ffffffffb5e53ca0
[   15.512049][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005e866fa
[   15.512051][    C0] R10: ffff88802f4337d3 R11: ffffffffb6811288 R12: 0000000000000000
[   15.512052][    C0] R13: ffffffffb681f240 R14: dffffc0000000000 R15: 0000000000014770
[ 15.512056][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.512061][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 15.512063][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.512066][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.512069][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.512073][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 15.512079][ C0] do_idle (kernel/sched/idle.c:325) 
[ 15.512083][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.512086][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 15.512089][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 15.512093][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:295) 
[ 15.512097][ 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