======================================
| [   12.652296][    C0] 1 lock held by swapper/0/0:
| [ 12.652529][ C0] #0: ffffffff863774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   12.652935][    C0]
| [   12.652935][    C0] stack backtrace:
[   12.653229][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.653231][    C0] Call Trace:
[   12.653233][    C0]  <IRQ>
[ 12.653235][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 12.653241][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 12.653245][ C0] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 12.653249][ C0] ? is_bpf_text_address (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 kernel/bpf/core.c:774) 
[ 12.653254][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 12.653259][ C0] ? save_trace (kernel/locking/lockdep.c:595) 
[ 12.653263][ C0] mark_lock (kernel/locking/lockdep.c:4756) 
[ 12.653267][ C0] mark_usage (kernel/locking/lockdep.c:4645) 
[ 12.653270][ C0] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 12.653273][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 12.653278][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 12.653281][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 12.653284][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 12.653289][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 12.653292][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 12.653296][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 12.653300][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 12.653302][ C0] simple_pin_fs (fs/libfs.c:1067) 
[ 12.653305][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 12.653309][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 12.653313][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 12.653316][ 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) 
[ 12.653321][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.653324][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 12.653327][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 12.653330][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 12.653334][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.653338][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.653341][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.653343][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.653346][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.653350][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 12.653352][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.653355][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 12.653358][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 12.653363][ C0] __put_net (net/core/net_namespace.c:732) 
[ 12.653368][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 12.653372][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.653374][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.653379][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 12.653383][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 12.653387][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 12.653390][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 12.653394][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 12.653399][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 12.653405][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 12.653408][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 12.653411][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   12.653415][    C0]  </IRQ>
[   12.653416][    C0]  <TASK>
[ 12.653418][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.653420][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.653424][ 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
[   12.653427][    C0] RSP: 0018:ffffffff86007df8 EFLAGS: 00000246
[   12.653430][    C0] RAX: 0000000000067159 RBX: 1ffffffff0c00fc3 RCX: ffffffff853a25d9
[   12.653432][    C0] RDX: 0000000000000000 RSI: ffffffff85e9175c RDI: ffffffff85653ca0
[   12.653434][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c066fa
[   12.653436][    C0] R10: ffff8880360337d3 R11: ffffffff86011288 R12: 0000000000000000
[   12.653438][    C0] R13: ffffffff8601f240 R14: dffffc0000000000 R15: 0000000000014770
[ 12.653441][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 12.653446][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.653448][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.653451][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.653454][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 12.653458][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 12.653464][ C0] do_idle (kernel/sched/idle.c:325) 
[ 12.653468][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.653471][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 12.653475][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 12.653479][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:295) 
[ 12.653483][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:231 (discriminator 17)) 
[ 12.653488][ C0] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   12.674323][    C0] RCU nest depth: 0, expected: 0
| [   12.674528][    C0] INFO: lockdep is turned off.
| [   12.674733][    C0] Preemption disabled at:
| [ 12.674735][ C0] schedule_preempt_disabled (kernel/sched/core.c:6933) 
[   12.675205][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.675207][    C0] Call Trace:
[   12.675209][    C0]  <IRQ>
[ 12.675210][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 12.675216][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 12.675223][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 12.675227][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 12.675229][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 12.675234][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 12.675241][ 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) 
[ 12.675245][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 12.675248][ 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) 
[ 12.675251][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 12.675257][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 12.675260][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 12.675264][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 12.675267][ 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) 
[ 12.675272][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.675275][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 12.675277][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 12.675282][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 12.675286][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.675289][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.675293][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.675295][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.675298][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.675301][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 12.675304][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.675307][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 12.675310][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 12.675317][ C0] __put_net (net/core/net_namespace.c:732) 
[ 12.675321][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 12.675325][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.675328][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.675333][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 12.675337][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 12.675342][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 12.675345][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 12.675351][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 12.675356][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 12.675361][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 12.675365][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 12.675368][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   12.675371][    C0]  </IRQ>
[   12.675372][    C0]  <TASK>
[ 12.675374][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.675377][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.675380][ 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
[   12.675383][    C0] RSP: 0018:ffffffff86007df8 EFLAGS: 00000246
[   12.675386][    C0] RAX: 0000000000067159 RBX: 1ffffffff0c00fc3 RCX: ffffffff853a25d9
[   12.675388][    C0] RDX: 0000000000000000 RSI: ffffffff85e9175c RDI: ffffffff85653ca0
[   12.675389][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c066fa
[   12.675391][    C0] R10: ffff8880360337d3 R11: ffffffff86011288 R12: 0000000000000000
[   12.675393][    C0] R13: ffffffff8601f240 R14: dffffc0000000000 R15: 0000000000014770
[ 12.675396][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 12.675401][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.675403][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.675406][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.675409][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 12.675413][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 12.675419][ C0] do_idle (kernel/sched/idle.c:325) 
[ 12.675423][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.675426][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 12.675429][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 12.675433][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:295) 
[ 12.675437][ 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