======================================
| [   13.866925][    C0] 1 lock held by swapper/0/0:
| [ 13.867140][ C0] #0: ffffffffaf974480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   13.867529][    C0]
| [   13.867529][    C0] stack backtrace:
[   13.867795][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.867798][    C0] Call Trace:
[   13.867799][    C0]  <IRQ>
[ 13.867801][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.867807][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 13.867813][ C0] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 13.867816][ C0] ? is_bpf_text_address (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 kernel/bpf/core.c:774) 
[ 13.867819][ C0] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 13.867823][ C0] ? save_trace (kernel/locking/lockdep.c:594) 
[ 13.867829][ C0] mark_lock (kernel/locking/lockdep.c:4754) 
[ 13.867832][ C0] mark_usage (kernel/locking/lockdep.c:4643) 
[ 13.867835][ C0] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 13.867839][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 13.867842][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.867847][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.867850][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 13.867852][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.867856][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 13.867859][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.867861][ C0] simple_pin_fs (fs/libfs.c:1066) 
[ 13.867864][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 13.867869][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 13.867875][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.867878][ 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) 
[ 13.867883][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.867887][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.867890][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.867893][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 13.867897][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.867900][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.867904][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.867907][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.867909][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.867912][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 13.867914][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.867916][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.867919][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.867924][ C0] __put_net (net/core/net_namespace.c:732) 
[ 13.867928][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 13.867932][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.867935][ C0] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.867939][ C0] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 13.867943][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 13.867947][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.867950][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 13.867954][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 13.867958][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 13.867962][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 13.867967][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.867970][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.867972][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   13.867975][    C0]  </IRQ>
[   13.867976][    C0]  <TASK>
[ 13.867978][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.867981][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.867985][ 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
[   13.867988][    C0] RSP: 0018:ffffffffaf607df8 EFLAGS: 00000246
[   13.867991][    C0] RAX: 00000000000656db RBX: 1ffffffff5ec0fc3 RCX: ffffffffae968a19
[   13.867993][    C0] RDX: 0000000000000000 RSI: ffffffffaf4881e1 RDI: ffffffffaec50e20
[   13.867995][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c0667a
[   13.867997][    C0] R10: ffff8880360333d3 R11: 0000000000000000 R12: 0000000000000000
[   13.867998][    C0] R13: ffffffffaf61f240 R14: dffffc0000000000 R15: 0000000000014770
[ 13.868002][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.868007][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.868011][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.868013][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.868015][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.868019][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 13.868024][ C0] do_idle (kernel/sched/idle.c:325) 
[ 13.868027][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.868029][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.868032][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.868036][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:501) 
[ 13.868041][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:443 (discriminator 17)) 
[ 13.868044][ C0] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   13.887685][    C0] RCU nest depth: 0, expected: 0
| [   13.887887][    C0] INFO: lockdep is turned off.
| [   13.888087][    C0] Preemption disabled at:
| [ 13.888089][ C0] schedule_preempt_disabled (kernel/sched/core.c:6919) 
[   13.888561][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.888563][    C0] Call Trace:
[   13.888565][    C0]  <IRQ>
[ 13.888567][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.888573][ C0] __might_resched (kernel/sched/core.c:8819) 
[ 13.888579][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 13.888582][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 13.888585][ C0] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 13.888589][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.888594][ 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) 
[ 13.888599][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 13.888602][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 13.888607][ 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) 
[ 13.888611][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 13.888615][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 13.888620][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.888623][ 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) 
[ 13.888628][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.888633][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.888636][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.888640][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 13.888644][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.888648][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.888651][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.888654][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.888656][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.888659][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 13.888661][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.888664][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.888666][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.888673][ C0] __put_net (net/core/net_namespace.c:732) 
[ 13.888676][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 13.888680][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.888683][ C0] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.888687][ C0] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 13.888693][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 13.888697][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.888701][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 13.888704][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 13.888708][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 13.888712][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 13.888717][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.888720][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.888722][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   13.888726][    C0]  </IRQ>
[   13.888727][    C0]  <TASK>
[ 13.888728][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.888731][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.888735][ 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
[   13.888737][    C0] RSP: 0018:ffffffffaf607df8 EFLAGS: 00000246
[   13.888741][    C0] RAX: 00000000000656db RBX: 1ffffffff5ec0fc3 RCX: ffffffffae968a19
[   13.888743][    C0] RDX: 0000000000000000 RSI: ffffffffaf4881e1 RDI: ffffffffaec50e20
[   13.888744][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c0667a
[   13.888746][    C0] R10: ffff8880360333d3 R11: 0000000000000000 R12: 0000000000000000
[   13.888748][    C0] R13: ffffffffaf61f240 R14: dffffc0000000000 R15: 0000000000014770
[ 13.888751][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.888757][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.888760][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.888762][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.888765][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.888769][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 13.888773][ C0] do_idle (kernel/sched/idle.c:325) 
[ 13.888776][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.888779][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.888782][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.888786][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:501) 
[ 13.888791][ 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