======================================
| [  394.013106][    C1] 1 lock held by swapper/1/0:
| [ 394.013291][ C1] #0: ffffffff97b8b540 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [  394.013624][    C1]
| [  394.013624][    C1] stack backtrace:
[  394.013856][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  394.013858][    C1] Call Trace:
[  394.013859][    C1]  <IRQ>
[ 394.013862][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 394.013868][ C1] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 394.013872][ C1] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 394.013875][ C1] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 394.013881][ C1] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 394.013885][ C1] ? save_trace (kernel/locking/lockdep.c:595) 
[ 394.013891][ C1] mark_lock (kernel/locking/lockdep.c:4756) 
[ 394.013894][ C1] mark_usage (kernel/locking/lockdep.c:4645) 
[ 394.013897][ C1] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 394.013900][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 394.013903][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 394.013906][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 394.013909][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 394.013912][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 394.013915][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 394.013918][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 394.013922][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 394.013924][ C1] simple_pin_fs (fs/libfs.c:1067) 
[ 394.013927][ C1] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 394.013931][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 394.013935][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 394.013938][ C1] ? __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) 
[ 394.013942][ C1] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 394.013946][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 394.013948][ C1] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 394.013951][ C1] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 394.013954][ C1] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 394.013958][ C1] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 394.013961][ C1] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 394.013963][ C1] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 394.013965][ C1] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 394.013968][ C1] ? do_idle (kernel/sched/idle.c:325) 
[ 394.013970][ C1] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 394.013972][ C1] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 394.013977][ C1] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 394.013982][ C1] __put_net (net/core/net_namespace.c:732) 
[ 394.013986][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 394.013990][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 394.013993][ C1] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 394.013999][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 394.014003][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 394.014006][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 394.014009][ C1] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 394.014013][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 394.014018][ C1] handle_softirqs (kernel/softirq.c:580) 
[ 394.014023][ C1] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 394.014026][ C1] irq_exit_rcu (kernel/softirq.c:698) 
[ 394.014028][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[  394.014032][    C1]  </IRQ>
[  394.014033][    C1]  <TASK>
[ 394.014034][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 394.014037][ C1] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 394.014041][ C1] 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
[  394.014043][    C1] RSP: 0000:ffffc90000137de8 EFLAGS: 00000242
[  394.014046][    C1] RAX: 00000000010180ad RBX: 1ffff92000026fc1 RCX: ffffffff9646a5f9
[  394.014048][    C1] RDX: 0000000000000000 RSI: ffffffff97115cea RDI: ffffffff968568c0
[  394.014050][    C1] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100d9d66fa
[  394.014051][    C1] R10: ffff88806ceb37d3 R11: ffffffff97811288 R12: 0000000000000000
[  394.014053][    C1] R13: ffff888001b60040 R14: dffffc0000000000 R15: 0000000000000000
[ 394.014057][ C1] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 394.014062][ C1] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 394.014065][ C1] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 394.014067][ C1] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 394.014070][ C1] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 394.014073][ C1] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 394.014077][ C1] do_idle (kernel/sched/idle.c:325) 
[ 394.014080][ C1] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 394.014083][ C1] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 394.014086][ C1] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 394.014092][ C1] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [  394.029779][    C1] RCU nest depth: 0, expected: 0
| [  394.029950][    C1] INFO: lockdep is turned off.
| [  394.030121][    C1] Preemption disabled at:
| [ 394.030122][ C1] 0x0 
[  394.030433][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  394.030435][    C1] Call Trace:
[  394.030436][    C1]  <IRQ>
[ 394.030438][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 394.030445][ C1] __might_resched (kernel/sched/core.c:8796) 
[ 394.030452][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 394.030455][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 394.030458][ C1] ? simple_recursive_removal (fs/libfs.c:614) 
[ 394.030462][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 394.030467][ C1] ? 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) 
[ 394.030471][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 394.030475][ C1] ? 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) 
[ 394.030478][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 394.030484][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 394.030487][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 394.030491][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 394.030494][ C1] ? __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) 
[ 394.030497][ C1] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 394.030501][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 394.030504][ C1] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 394.030508][ C1] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 394.030511][ C1] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 394.030514][ C1] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 394.030517][ C1] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 394.030520][ C1] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 394.030522][ C1] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 394.030524][ C1] ? do_idle (kernel/sched/idle.c:325) 
[ 394.030526][ C1] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 394.030528][ C1] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 394.030533][ C1] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 394.030539][ C1] __put_net (net/core/net_namespace.c:732) 
[ 394.030543][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 394.030547][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 394.030550][ C1] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 394.030556][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 394.030560][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 394.030563][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 394.030566][ C1] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 394.030571][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 394.030575][ C1] handle_softirqs (kernel/softirq.c:580) 
[ 394.030580][ C1] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 394.030583][ C1] irq_exit_rcu (kernel/softirq.c:698) 
[ 394.030585][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[  394.030589][    C1]  </IRQ>
[  394.030590][    C1]  <TASK>
[ 394.030591][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 394.030594][ C1] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 394.030597][ C1] 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
[  394.030600][    C1] RSP: 0000:ffffc90000137de8 EFLAGS: 00000242
[  394.030603][    C1] RAX: 00000000010180ad RBX: 1ffff92000026fc1 RCX: ffffffff9646a5f9
[  394.030605][    C1] RDX: 0000000000000000 RSI: ffffffff97115cea RDI: ffffffff968568c0
[  394.030606][    C1] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100d9d66fa
[  394.030608][    C1] R10: ffff88806ceb37d3 R11: ffffffff97811288 R12: 0000000000000000
[  394.030610][    C1] R13: ffff888001b60040 R14: dffffc0000000000 R15: 0000000000000000
[ 394.030613][ C1] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 394.030619][ C1] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 394.030621][ C1] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 394.030623][ C1] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 394.030626][ C1] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 394.030630][ C1] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 394.030634][ C1] do_idle (kernel/sched/idle.c:325) 
[ 394.030637][ C1] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 394.030640][ C1] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 394.030643][ C1] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 


Finger prints:
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock
__might_resched:down_write:simple_recursive_removal:debugfs_remove:ref_tracker_dir_exit