======================================
| [ 1030.783052][    C0] 1 lock held by swapper/0/0:
| [ 1030.783259][ C0] #0: ffffffff9958b540 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [ 1030.783632][    C0]
| [ 1030.783632][    C0] stack backtrace:
[ 1030.783889][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1030.783891][    C0] Call Trace:
[ 1030.783894][    C0]  <IRQ>
[ 1030.783895][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 1030.783903][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 1030.783907][ C0] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 1030.783911][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 1030.783914][ C0] ? x86_64_start_reservations (arch/x86/kernel/head64.c:295) 
[ 1030.783919][ C0] ? x86_64_start_kernel (arch/x86/kernel/head64.c:231 (discriminator 17)) 
[ 1030.783923][ C0] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 1030.783928][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 1030.783933][ C0] ? save_trace (kernel/locking/lockdep.c:595) 
[ 1030.783939][ C0] mark_lock (kernel/locking/lockdep.c:4756) 
[ 1030.783943][ C0] mark_usage (kernel/locking/lockdep.c:4645) 
[ 1030.783945][ C0] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 1030.783950][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 1030.783953][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 1030.783957][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 1030.783960][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 1030.783963][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 1030.783966][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 1030.783969][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 1030.783972][ C0] simple_pin_fs (fs/libfs.c:1067) 
[ 1030.783975][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 1030.783978][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 1030.783984][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 1030.783987][ 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) 
[ 1030.783992][ C0] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 1030.783995][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 1030.783998][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 1030.784001][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 1030.784006][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 1030.784009][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 1030.784012][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 1030.784015][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 1030.784017][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 1030.784020][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 1030.784022][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 1030.784024][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 1030.784027][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 1030.784032][ C0] __put_net (net/core/net_namespace.c:732) 
[ 1030.784037][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 1030.784040][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 1030.784044][ C0] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 1030.784048][ C0] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 1030.784053][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 1030.784057][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 1030.784060][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 1030.784064][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 1030.784069][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 1030.784074][ C0] handle_softirqs (kernel/softirq.c:580) 
[ 1030.784079][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 1030.784081][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 1030.784084][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 1030.784087][    C0]  </IRQ>
[ 1030.784089][    C0]  <TASK>
[ 1030.784090][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 1030.784093][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 1030.784097][ C0] Code: 92 d0 00 e9 03 55 02 00 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 63 97 22 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:	92                   	xchg   %eax,%edx
   1:	d0 00                	rolb   $1,(%rax)
   3:	e9 03 55 02 00       	jmp    0x2550b
   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 63 97 22 00 	verw   0x229763(%rip)        # 0x22978b
  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
[ 1030.784100][    C0] RSP: 0018:ffffffff99207df8 EFLAGS: 00000242
[ 1030.784103][    C0] RAX: 0000000000df183d RBX: 1ffffffff3240fc3 RCX: ffffffff97e6a5f9
[ 1030.784106][    C0] RDX: 0000000000000000 RSI: ffffffff98b15cea RDI: ffffffff982568c0
[ 1030.784107][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100d9c66fa
[ 1030.784109][    C0] R10: ffff88806ce337d3 R11: ffffffff99211288 R12: 0000000000000000
[ 1030.784110][    C0] R13: ffffffff99233240 R14: dffffc0000000000 R15: 0000000000014770
[ 1030.784114][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 1030.784120][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 1030.784122][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 1030.784124][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 1030.784127][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 1030.784131][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 1030.784136][ C0] do_idle (kernel/sched/idle.c:325) 
[ 1030.784139][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 1030.784142][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 1030.784145][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 1030.784149][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:295) 
[ 1030.784153][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:231 (discriminator 17)) 
[ 1030.784156][ C0] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [ 1030.803176][    C0] RCU nest depth: 0, expected: 0
| [ 1030.803370][    C0] INFO: lockdep is turned off.
| [ 1030.803567][    C0] Preemption disabled at:
| [ 1030.803569][ C0] schedule_preempt_disabled (kernel/sched/core.c:6933) 
[ 1030.804140][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1030.804142][    C0] Call Trace:
[ 1030.804144][    C0]  <IRQ>
[ 1030.804145][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 1030.804152][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 1030.804160][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 1030.804164][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 1030.804166][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 1030.804171][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 1030.804176][ 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) 
[ 1030.804181][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 1030.804184][ 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) 
[ 1030.804188][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 1030.804195][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 1030.804198][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 1030.804203][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 1030.804206][ 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) 
[ 1030.804209][ C0] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 1030.804214][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 1030.804217][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 1030.804222][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 1030.804227][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 1030.804230][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 1030.804234][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 1030.804236][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 1030.804239][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 1030.804242][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 1030.804244][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 1030.804246][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 1030.804248][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 1030.804256][ C0] __put_net (net/core/net_namespace.c:732) 
[ 1030.804261][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 1030.804264][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 1030.804268][ C0] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 1030.804272][ C0] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 1030.804278][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 1030.804282][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 1030.804287][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 1030.804291][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 1030.804296][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 1030.804301][ C0] handle_softirqs (kernel/softirq.c:580) 
[ 1030.804306][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 1030.804309][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 1030.804311][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 1030.804315][    C0]  </IRQ>
[ 1030.804316][    C0]  <TASK>
[ 1030.804317][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 1030.804320][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 1030.804324][ C0] Code: 92 d0 00 e9 03 55 02 00 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 63 97 22 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:	92                   	xchg   %eax,%edx
   1:	d0 00                	rolb   $1,(%rax)
   3:	e9 03 55 02 00       	jmp    0x2550b
   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 63 97 22 00 	verw   0x229763(%rip)        # 0x22978b
  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
[ 1030.804327][    C0] RSP: 0018:ffffffff99207df8 EFLAGS: 00000242
[ 1030.804330][    C0] RAX: 0000000000df183d RBX: 1ffffffff3240fc3 RCX: ffffffff97e6a5f9
[ 1030.804332][    C0] RDX: 0000000000000000 RSI: ffffffff98b15cea RDI: ffffffff982568c0
[ 1030.804333][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100d9c66fa
[ 1030.804335][    C0] R10: ffff88806ce337d3 R11: ffffffff99211288 R12: 0000000000000000
[ 1030.804337][    C0] R13: ffffffff99233240 R14: dffffc0000000000 R15: 0000000000014770
[ 1030.804341][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 1030.804346][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 1030.804348][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 1030.804350][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 1030.804353][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 1030.804357][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 1030.804362][ C0] do_idle (kernel/sched/idle.c:325) 
[ 1030.804365][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 1030.804368][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 1030.804371][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 1030.804375][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:295) 
[ 1030.804379][ 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