======================================
| [   13.867009][    C0] 1 lock held by swapper/0/0:
| [ 13.867240][ C0] #0: ffffffffa1f74480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   13.867659][    C0]
| [   13.867659][    C0] stack backtrace:
[   13.867967][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.867970][    C0] Call Trace:
[   13.867972][    C0]  <IRQ>
[ 13.867974][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.867983][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 13.867988][ C0] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 13.867992][ C0] ? is_bpf_text_address (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 kernel/bpf/core.c:774) 
[ 13.867996][ C0] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 13.868000][ C0] ? save_trace (kernel/locking/lockdep.c:594) 
[ 13.868007][ C0] mark_lock (kernel/locking/lockdep.c:4754) 
[ 13.868010][ C0] mark_usage (kernel/locking/lockdep.c:4643) 
[ 13.868013][ C0] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 13.868018][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 13.868020][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.868025][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.868028][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 13.868031][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.868035][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 13.868040][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.868042][ C0] simple_pin_fs (fs/libfs.c:1066) 
[ 13.868045][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 13.868050][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 13.868057][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.868060][ 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:2333) 
[ 13.868067][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.868070][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.868074][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.868078][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 13.868083][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.868087][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.868090][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.868094][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.868096][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.868100][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 13.868102][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.868104][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.868107][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.868114][ C0] __put_net (net/core/net_namespace.c:732) 
[ 13.868119][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 13.868122][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.868125][ C0] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.868130][ C0] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 13.868134][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 13.868138][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.868141][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 13.868145][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 13.868149][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 13.868154][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 13.868159][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.868161][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.868164][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   13.868167][    C0]  </IRQ>
[   13.868168][    C0]  <TASK>
[ 13.868170][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.868173][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.868177][ C0] Code: a0 b7 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 a3 a0 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:	a0 b7 00 c3 cc cc cc 	movabs 0xfccccccccc300b7,%al
   7:	cc 0f 
   9:	1f                   	(bad)
   a:	00 90 90 90 90 90    	add    %dl,-0x6f6f6f70(%rax)
  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 a3 a0 12 00 	verw   0x12a0a3(%rip)        # 0x12a0cb
  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
[   13.868180][    C0] RSP: 0018:ffffffffa1c07df8 EFLAGS: 00000246
[   13.868184][    C0] RAX: 000000000006ace1 RBX: 1ffffffff4380fc3 RCX: ffffffffa0f68a19
[   13.868186][    C0] RDX: 0000000000000000 RSI: ffffffffa1a881e1 RDI: ffffffffa1250e20
[   13.868188][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c0667a
[   13.868190][    C0] R10: ffff8880360333d3 R11: 0000000000000000 R12: 0000000000000000
[   13.868191][    C0] R13: ffffffffa1c1f240 R14: dffffc0000000000 R15: 0000000000014770
[ 13.868195][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.868201][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.868204][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.868206][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.868209][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.868212][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 13.868218][ C0] do_idle (kernel/sched/idle.c:325) 
[ 13.868221][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.868224][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.868226][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.868230][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:501) 
[ 13.868236][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:443 (discriminator 17)) 
[ 13.868241][ C0] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   13.888817][    C0] RCU nest depth: 0, expected: 0
| [   13.889027][    C0] INFO: lockdep is turned off.
| [   13.889225][    C0] Preemption disabled at:
| [ 13.889227][ C0] schedule_preempt_disabled (kernel/sched/core.c:6919) 
[   13.889699][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.889702][    C0] Call Trace:
[   13.889704][    C0]  <IRQ>
[ 13.889706][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.889714][ C0] __might_resched (kernel/sched/core.c:8819) 
[ 13.889723][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 13.889726][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 13.889729][ C0] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 13.889734][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.889741][ 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) 
[ 13.889747][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 13.889749][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 13.889756][ 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) 
[ 13.889761][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 13.889764][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 13.889771][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.889775][ 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:2333) 
[ 13.889781][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.889787][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.889790][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.889795][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 13.889800][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.889806][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.889809][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.889812][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.889815][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.889819][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 13.889821][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.889823][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.889825][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.889833][ C0] __put_net (net/core/net_namespace.c:732) 
[ 13.889837][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 13.889841][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.889844][ C0] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.889849][ C0] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 13.889855][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 13.889859][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.889864][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 13.889868][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 13.889872][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 13.889877][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 13.889882][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.889884][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.889887][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   13.889890][    C0]  </IRQ>
[   13.889891][    C0]  <TASK>
[ 13.889893][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.889896][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.889900][ C0] Code: a0 b7 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 a3 a0 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:	a0 b7 00 c3 cc cc cc 	movabs 0xfccccccccc300b7,%al
   7:	cc 0f 
   9:	1f                   	(bad)
   a:	00 90 90 90 90 90    	add    %dl,-0x6f6f6f70(%rax)
  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 a3 a0 12 00 	verw   0x12a0a3(%rip)        # 0x12a0cb
  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
[   13.889903][    C0] RSP: 0018:ffffffffa1c07df8 EFLAGS: 00000246
[   13.889906][    C0] RAX: 000000000006ace1 RBX: 1ffffffff4380fc3 RCX: ffffffffa0f68a19
[   13.889909][    C0] RDX: 0000000000000000 RSI: ffffffffa1a881e1 RDI: ffffffffa1250e20
[   13.889910][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c0667a
[   13.889912][    C0] R10: ffff8880360333d3 R11: 0000000000000000 R12: 0000000000000000
[   13.889913][    C0] R13: ffffffffa1c1f240 R14: dffffc0000000000 R15: 0000000000014770
[ 13.889917][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.889923][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.889926][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.889928][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.889931][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.889934][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 13.889940][ C0] do_idle (kernel/sched/idle.c:325) 
[ 13.889944][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.889946][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.889950][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.889954][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:501) 
[ 13.889959][ 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