======================================
| [   13.596098][    C0] 1 lock held by swapper/0/0:
| [ 13.596306][ C0] #0: ffffffffb2d774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   13.596678][    C0]
| [   13.596678][    C0] stack backtrace:
[   13.596939][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.596941][    C0] Call Trace:
[   13.596943][    C0]  <IRQ>
[ 13.596945][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.596951][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 13.596957][ C0] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 13.596960][ C0] ? is_bpf_text_address (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 kernel/bpf/core.c:774) 
[ 13.596965][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 13.596970][ C0] ? save_trace (kernel/locking/lockdep.c:595) 
[ 13.596975][ C0] mark_lock (kernel/locking/lockdep.c:4756) 
[ 13.596982][ C0] mark_usage (kernel/locking/lockdep.c:4645) 
[ 13.596987][ C0] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 13.596993][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 13.596999][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 13.597003][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 13.597007][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.597013][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 13.597016][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 13.597020][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 13.597024][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 13.597026][ C0] simple_pin_fs (fs/libfs.c:1067) 
[ 13.597029][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 13.597034][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 13.597038][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.597041][ 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) 
[ 13.597046][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.597049][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.597051][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.597055][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 13.597060][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.597063][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 13.597067][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 13.597069][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.597072][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.597076][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 13.597079][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.597081][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.597084][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.597091][ C0] __put_net (net/core/net_namespace.c:732) 
[ 13.597095][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 13.597099][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.597102][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.597105][ C0] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 13.597109][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 13.597112][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.597116][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 13.597120][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 13.597124][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 13.597129][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 13.597135][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.597138][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.597141][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   13.597145][    C0]  </IRQ>
[   13.597146][    C0]  <TASK>
[ 13.597148][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.597150][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 13.597154][ C0] Code: a2 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 17 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:	a2 b4 00 c3 cc cc cc 	movabs %al,0xfccccccccc300b4
   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 83 17 0f 00 	verw   0xf1783(%rip)        # 0xf17ab
  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
[   13.597157][    C0] RSP: 0018:ffffffffb2a07df8 EFLAGS: 00000242
[   13.597160][    C0] RAX: 000000000006a467 RBX: 1ffffffff6540fc3 RCX: ffffffffb1da25d9
[   13.597163][    C0] RDX: 0000000000000000 RSI: ffffffffb289175c RDI: ffffffffb2053ca0
[   13.597164][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c066fa
[   13.597166][    C0] R10: ffff8880360337d3 R11: ffffffffb2a11288 R12: 0000000000000000
[   13.597168][    C0] R13: ffffffffb2a1f240 R14: dffffc0000000000 R15: 0000000000014770
[ 13.597172][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.597177][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 13.597179][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.597181][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.597185][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.597189][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 13.597195][ C0] do_idle (kernel/sched/idle.c:325) 
[ 13.597199][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.597203][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.597206][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.597210][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:295) 
[ 13.597215][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:231 (discriminator 17)) 
[ 13.597219][ C0] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   13.616688][    C0] RCU nest depth: 0, expected: 0
| [   13.616878][    C0] INFO: lockdep is turned off.
| [   13.617068][    C0] Preemption disabled at:
| [ 13.617070][ C0] schedule_preempt_disabled (kernel/sched/core.c:6933) 
[   13.617516][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.617518][    C0] Call Trace:
[   13.617520][    C0]  <IRQ>
[ 13.617522][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.617527][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 13.617535][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 13.617539][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 13.617542][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 13.617546][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.617552][ 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) 
[ 13.617556][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 13.617559][ 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) 
[ 13.617561][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 13.617568][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 13.617571][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 13.617576][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.617579][ 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) 
[ 13.617584][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.617588][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.617590][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.617596][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 13.617600][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.617604][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 13.617608][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 13.617610][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.617613][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.617616][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 13.617619][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.617622][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.617625][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.617632][ C0] __put_net (net/core/net_namespace.c:732) 
[ 13.617636][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 13.617640][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.617643][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.617647][ C0] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 13.617651][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 13.617655][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.617660][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 13.617663][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 13.617668][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 13.617673][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 13.617678][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.617682][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.617685][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   13.617688][    C0]  </IRQ>
[   13.617689][    C0]  <TASK>
[ 13.617691][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.617693][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 13.617698][ C0] Code: a2 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 17 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:	a2 b4 00 c3 cc cc cc 	movabs %al,0xfccccccccc300b4
   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 83 17 0f 00 	verw   0xf1783(%rip)        # 0xf17ab
  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
[   13.617700][    C0] RSP: 0018:ffffffffb2a07df8 EFLAGS: 00000242
[   13.617704][    C0] RAX: 000000000006a467 RBX: 1ffffffff6540fc3 RCX: ffffffffb1da25d9
[   13.617706][    C0] RDX: 0000000000000000 RSI: ffffffffb289175c RDI: ffffffffb2053ca0
[   13.617707][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c066fa
[   13.617709][    C0] R10: ffff8880360337d3 R11: ffffffffb2a11288 R12: 0000000000000000
[   13.617711][    C0] R13: ffffffffb2a1f240 R14: dffffc0000000000 R15: 0000000000014770
[ 13.617715][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.617719][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 13.617722][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.617724][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.617727][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.617731][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 13.617737][ C0] do_idle (kernel/sched/idle.c:325) 
[ 13.617741][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.617744][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.617747][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.617751][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:295) 
[ 13.617755][ 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