======================================
| [  209.133737][    C0] 1 lock held by swapper/0/0:
| [ 209.133957][ C0] #0: ffffffffaf377c00 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [  209.134352][    C0]
| [  209.134352][    C0] stack backtrace:
[  209.134631][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  209.134633][    C0] Call Trace:
[  209.134635][    C0]  <IRQ>
[ 209.134637][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 209.134643][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 209.134648][ C0] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 209.134652][ C0] ? is_bpf_text_address (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 kernel/bpf/core.c:774) 
[ 209.134658][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 209.134662][ C0] ? save_trace (kernel/locking/lockdep.c:595) 
[ 209.134666][ C0] mark_lock (kernel/locking/lockdep.c:4756) 
[ 209.134670][ C0] mark_usage (kernel/locking/lockdep.c:4645) 
[ 209.134674][ C0] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 209.134677][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 209.134682][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 209.134686][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 209.134690][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 209.134696][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 209.134699][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 209.134704][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 209.134707][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 209.134710][ C0] simple_pin_fs (fs/libfs.c:1067) 
[ 209.134714][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 209.134717][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 209.134722][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 209.134726][ 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) 
[ 209.134731][ C0] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 209.134735][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 209.134738][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 209.134741][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 209.134745][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 209.134748][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 209.134751][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 209.134754][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 209.134756][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 209.134761][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 209.134763][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 209.134766][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 209.134769][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 209.134774][ C0] __put_net (net/core/net_namespace.c:732) 
[ 209.134778][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 209.134782][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 209.134785][ C0] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 209.134789][ C0] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 209.134793][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 209.134797][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 209.134800][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 209.134804][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 209.134808][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 209.134812][ C0] handle_softirqs (kernel/softirq.c:580) 
[ 209.134818][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 209.134821][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 209.134824][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[  209.134827][    C0]  </IRQ>
[  209.134828][    C0]  <TASK>
[ 209.134830][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 209.134832][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 209.134836][ C0] Code: f2 ce 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 17 28 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:	f2 ce                	repnz (bad)
   2:	00 c3                	add    %al,%bl
   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 17 28 00 	verw   0x281783(%rip)        # 0x2817ab
  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
[  209.134839][    C0] RSP: 0018:ffffffffaf007df8 EFLAGS: 00000242
[  209.134842][    C0] RAX: 00000000003520e9 RBX: 1ffffffff5e00fc3 RCX: ffffffffae2125d9
[  209.134844][    C0] RDX: 0000000000000000 RSI: ffffffffaeea61cd RDI: ffffffffae658be0
[  209.134846][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c066fa
[  209.134847][    C0] R10: ffff8880360337d3 R11: ffffffffaf011288 R12: 0000000000000000
[  209.134849][    C0] R13: ffffffffaf01f240 R14: dffffc0000000000 R15: 0000000000014770
[ 209.134853][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 209.134858][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 209.134860][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 209.134862][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 209.134866][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 209.134870][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 209.134876][ C0] do_idle (kernel/sched/idle.c:325) 
[ 209.134881][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 209.134884][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 209.134887][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 209.134891][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:295) 
[ 209.134896][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:231 (discriminator 17)) 
[ 209.134899][ C0] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [  209.157815][    C0] RCU nest depth: 0, expected: 0
| [  209.158011][    C0] INFO: lockdep is turned off.
| [  209.158204][    C0] Preemption disabled at:
| [ 209.158206][ C0] schedule_preempt_disabled (kernel/sched/core.c:6933) 
[  209.158764][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  209.158766][    C0] Call Trace:
[  209.158767][    C0]  <IRQ>
[ 209.158769][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 209.158775][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 209.158781][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 209.158784][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 209.158787][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 209.158791][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 209.158797][ 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) 
[ 209.158801][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 209.158804][ 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) 
[ 209.158806][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 209.158812][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 209.158815][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 209.158820][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 209.158823][ 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) 
[ 209.158828][ C0] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 209.158832][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 209.158835][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 209.158838][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 209.158842][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 209.158846][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 209.158849][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 209.158852][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 209.158854][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 209.158858][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 209.158861][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 209.158864][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 209.158866][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 209.158873][ C0] __put_net (net/core/net_namespace.c:732) 
[ 209.158876][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 209.158880][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 209.158883][ C0] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 209.158887][ C0] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 209.158891][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 209.158895][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 209.158899][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 209.158903][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 209.158908][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 209.158912][ C0] handle_softirqs (kernel/softirq.c:580) 
[ 209.158918][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 209.158921][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 209.158925][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[  209.158929][    C0]  </IRQ>
[  209.158930][    C0]  <TASK>
[ 209.158931][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 209.158934][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 209.158938][ C0] Code: f2 ce 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 17 28 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:	f2 ce                	repnz (bad)
   2:	00 c3                	add    %al,%bl
   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 17 28 00 	verw   0x281783(%rip)        # 0x2817ab
  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
[  209.158940][    C0] RSP: 0018:ffffffffaf007df8 EFLAGS: 00000242
[  209.158944][    C0] RAX: 00000000003520e9 RBX: 1ffffffff5e00fc3 RCX: ffffffffae2125d9
[  209.158946][    C0] RDX: 0000000000000000 RSI: ffffffffaeea61cd RDI: ffffffffae658be0
[  209.158947][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c066fa
[  209.158949][    C0] R10: ffff8880360337d3 R11: ffffffffaf011288 R12: 0000000000000000
[  209.158951][    C0] R13: ffffffffaf01f240 R14: dffffc0000000000 R15: 0000000000014770
[ 209.158954][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 209.158959][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 209.158961][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 209.158964][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 209.158967][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 209.158971][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 209.158977][ C0] do_idle (kernel/sched/idle.c:325) 
[ 209.158980][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 209.158984][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 209.158987][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 209.158991][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:295) 
[ 209.158995][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:231 (discriminator 17)) 


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