======================================
| [   13.610250][    C0] 1 lock held by swapper/0/0:
| [ 13.610632][ C0] #0: ffffffffa6f74480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   13.611295][    C0]
| [   13.611295][    C0] stack backtrace:
[   13.611756][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.611759][    C0] Call Trace:
[   13.611762][    C0]  <IRQ>
[ 13.611765][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.611773][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 13.611782][ C0] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 13.611788][ C0] ? is_bpf_text_address (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 kernel/bpf/core.c:774) 
[ 13.611807][ C0] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 13.611813][ C0] ? save_trace (kernel/locking/lockdep.c:594) 
[ 13.611822][ C0] mark_lock (kernel/locking/lockdep.c:4754) 
[ 13.611828][ C0] mark_usage (kernel/locking/lockdep.c:4643) 
[ 13.611833][ C0] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 13.611839][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 13.611844][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.611851][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.611857][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 13.611861][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.611867][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 13.611872][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.611876][ C0] simple_pin_fs (fs/libfs.c:1066) 
[ 13.611882][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 13.611889][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 13.611897][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.611902][ 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) 
[ 13.611909][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.611916][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.611920][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.611926][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 13.611932][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.611938][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.611943][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.611948][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.611951][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.611956][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 13.611960][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.611964][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.611968][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.611978][ C0] __put_net (net/core/net_namespace.c:732) 
[ 13.611983][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 13.611990][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.611995][ C0] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.612002][ C0] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 13.612008][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 13.612015][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.612020][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 13.612026][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 13.612033][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 13.612039][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 13.612048][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.612053][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.612057][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   13.612063][    C0]  </IRQ>
[   13.612065][    C0]  <TASK>
[ 13.612067][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.612072][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.612078][ 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
[   13.612083][    C0] RSP: 0018:ffffffffa6c07df8 EFLAGS: 00000242
[   13.612088][    C0] RAX: 0000000000060be5 RBX: 1ffffffff4d80fc3 RCX: ffffffffa5f68a19
[   13.612091][    C0] RDX: 0000000000000000 RSI: ffffffffa6a881e1 RDI: ffffffffa6250e20
[   13.612094][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c0667a
[   13.612097][    C0] R10: ffff8880360333d3 R11: 0000000000000000 R12: 0000000000000000
[   13.612100][    C0] R13: ffffffffa6c1f240 R14: dffffc0000000000 R15: 0000000000014770
[ 13.612108][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.612117][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.612121][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.612125][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.612131][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.612137][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 13.612145][ C0] do_idle (kernel/sched/idle.c:325) 
[ 13.612150][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.612154][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.612158][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.612163][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:501) 
[ 13.612169][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:443 (discriminator 17)) 
[ 13.612176][ C0] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   13.646035][    C0] RCU nest depth: 0, expected: 0
| [   13.646245][    C0] INFO: lockdep is turned off.
| [   13.646450][    C0] Preemption disabled at:
| [ 13.646452][ C0] schedule_preempt_disabled (kernel/sched/core.c:6919) 
[   13.647039][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.647041][    C0] Call Trace:
[   13.647043][    C0]  <IRQ>
[ 13.647045][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.647051][ C0] __might_resched (kernel/sched/core.c:8819) 
[ 13.647058][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 13.647061][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 13.647064][ C0] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 13.647068][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.647073][ 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) 
[ 13.647078][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 13.647081][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 13.647086][ 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) 
[ 13.647091][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 13.647094][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 13.647100][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.647103][ 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) 
[ 13.647108][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.647113][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.647116][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.647121][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 13.647124][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.647128][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.647131][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.647135][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.647137][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.647140][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 13.647142][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.647144][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.647147][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.647154][ C0] __put_net (net/core/net_namespace.c:732) 
[ 13.647158][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 13.647161][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.647165][ C0] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.647169][ C0] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 13.647174][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 13.647178][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.647182][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 13.647185][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 13.647190][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 13.647193][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 13.647199][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.647204][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.647207][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   13.647212][    C0]  </IRQ>
[   13.647214][    C0]  <TASK>
[ 13.647216][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.647221][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.647226][ 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
[   13.647228][    C0] RSP: 0018:ffffffffa6c07df8 EFLAGS: 00000242
[   13.647232][    C0] RAX: 0000000000060be5 RBX: 1ffffffff4d80fc3 RCX: ffffffffa5f68a19
[   13.647234][    C0] RDX: 0000000000000000 RSI: ffffffffa6a881e1 RDI: ffffffffa6250e20
[   13.647236][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c0667a
[   13.647238][    C0] R10: ffff8880360333d3 R11: 0000000000000000 R12: 0000000000000000
[   13.647240][    C0] R13: ffffffffa6c1f240 R14: dffffc0000000000 R15: 0000000000014770
[ 13.647244][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.647249][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.647253][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.647255][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.647258][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.647261][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 13.647266][ C0] do_idle (kernel/sched/idle.c:325) 
[ 13.647269][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.647272][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.647275][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.647279][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:501) 
[ 13.647283][ 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