======================================
| [   12.878482][    C0] 1 lock held by swapper/0/0:
| [ 12.878841][ C0] #0: ffffffff96d774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   12.879472][    C0]
| [   12.879472][    C0] stack backtrace:
[   12.879916][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.879919][    C0] Call Trace:
[   12.879922][    C0]  <IRQ>
[ 12.879925][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 12.879934][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 12.879943][ C0] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 12.879950][ C0] ? is_bpf_text_address (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 kernel/bpf/core.c:774) 
[ 12.879956][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 12.879964][ C0] ? save_trace (kernel/locking/lockdep.c:595) 
[ 12.879971][ C0] mark_lock (kernel/locking/lockdep.c:4756) 
[ 12.879978][ C0] mark_usage (kernel/locking/lockdep.c:4645) 
[ 12.879984][ C0] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 12.879990][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 12.879998][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 12.880004][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 12.880011][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 12.880019][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 12.880023][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 12.880031][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 12.880037][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 12.880041][ C0] simple_pin_fs (fs/libfs.c:1067) 
[ 12.880047][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 12.880054][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 12.880061][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 12.880066][ 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) 
[ 12.880073][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.880078][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 12.880083][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 12.880088][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 12.880096][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.880102][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.880107][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.880111][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.880116][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.880122][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 12.880126][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.880131][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 12.880135][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 12.880147][ C0] __put_net (net/core/net_namespace.c:732) 
[ 12.880153][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 12.880159][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.880164][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.880171][ C0] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 12.880178][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 12.880184][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 12.880190][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 12.880196][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 12.880204][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 12.880211][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 12.880221][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 12.880227][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 12.880232][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   12.880238][    C0]  </IRQ>
[   12.880240][    C0]  <TASK>
[ 12.880243][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.880248][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.880254][ 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
[   12.880258][    C0] RSP: 0018:ffffffff96a07df8 EFLAGS: 00000246
[   12.880263][    C0] RAX: 0000000000067f39 RBX: 1ffffffff2d40fc3 RCX: ffffffff95da35d9
[   12.880267][    C0] RDX: 0000000000000000 RSI: ffffffff9689175c RDI: ffffffff96053ca0
[   12.880271][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005e866fa
[   12.880274][    C0] R10: ffff88802f4337d3 R11: ffffffff96a11288 R12: 0000000000000000
[   12.880277][    C0] R13: ffffffff96a1f240 R14: dffffc0000000000 R15: 0000000000014770
[ 12.880285][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 12.880294][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.880299][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.880303][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.880309][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 12.880317][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 12.880325][ C0] do_idle (kernel/sched/idle.c:325) 
[ 12.880331][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.880336][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 12.880342][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 12.880349][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:295) 
[ 12.880355][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:231 (discriminator 17)) 
[ 12.880363][ C0] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   12.915389][    C0] RCU nest depth: 0, expected: 0
| [   12.915724][    C0] INFO: lockdep is turned off.
| [   12.916283][    C0] Preemption disabled at:
| [ 12.916287][ C0] schedule_preempt_disabled (kernel/sched/core.c:6933) 
[   12.917036][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.917039][    C0] Call Trace:
[   12.917042][    C0]  <IRQ>
[ 12.917045][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 12.917054][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 12.917065][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 12.917071][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 12.917076][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 12.917081][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 12.917088][ 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) 
[ 12.917094][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 12.917098][ 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) 
[ 12.917103][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 12.917112][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 12.917117][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 12.917124][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 12.917129][ 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) 
[ 12.917135][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.917141][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 12.917146][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 12.917152][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 12.917158][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.917163][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.917168][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.917173][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.917177][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.917183][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 12.917188][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.917192][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 12.917197][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 12.917208][ C0] __put_net (net/core/net_namespace.c:732) 
[ 12.917214][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 12.917220][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.917224][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.917230][ C0] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 12.917237][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 12.917243][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 12.917250][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 12.917256][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 12.917264][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 12.917272][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 12.917282][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 12.917288][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 12.917293][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   12.917299][    C0]  </IRQ>
[   12.917300][    C0]  <TASK>
[ 12.917302][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.917307][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.917313][ 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
[   12.917317][    C0] RSP: 0018:ffffffff96a07df8 EFLAGS: 00000246
[   12.917322][    C0] RAX: 0000000000067f39 RBX: 1ffffffff2d40fc3 RCX: ffffffff95da35d9
[   12.917325][    C0] RDX: 0000000000000000 RSI: ffffffff9689175c RDI: ffffffff96053ca0
[   12.917328][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005e866fa
[   12.917331][    C0] R10: ffff88802f4337d3 R11: ffffffff96a11288 R12: 0000000000000000
[   12.917334][    C0] R13: ffffffff96a1f240 R14: dffffc0000000000 R15: 0000000000014770
[ 12.917341][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 12.917351][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.917355][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.917360][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.917366][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 12.917373][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 12.917383][ C0] do_idle (kernel/sched/idle.c:325) 
[ 12.917389][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.917395][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 12.917401][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 12.917407][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:295) 
[ 12.917413][ 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