======================================
| [ 3183.290373][    C2] 1 lock held by swapper/2/0:
| [ 3183.290560][ C2] #0: ffffffffbad8b540 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [ 3183.290913][    C2]
| [ 3183.290913][    C2] stack backtrace:
[ 3183.291154][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 3183.291157][    C2] Call Trace:
[ 3183.291159][    C2]  <IRQ>
[ 3183.291161][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 3183.291169][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 3183.291173][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 3183.291177][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 3183.291182][ C2] ? save_trace (kernel/locking/lockdep.c:595) 
[ 3183.291188][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 3183.291192][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 3183.291195][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 3183.291198][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 3183.291202][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 3183.291205][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 3183.291208][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 3183.291212][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 3183.291215][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 3183.291218][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 3183.291221][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 3183.291224][ C2] simple_pin_fs (fs/libfs.c:1067) 
[ 3183.291228][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 3183.291231][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 3183.291237][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 3183.291240][ C2] ? __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) 
[ 3183.291246][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 3183.291249][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 3183.291252][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 3183.291254][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 3183.291259][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 3183.291263][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 3183.291267][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 3183.291269][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 3183.291271][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 3183.291275][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 3183.291277][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 3183.291279][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 3183.291285][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 3183.291292][ C2] __put_net (net/core/net_namespace.c:732) 
[ 3183.291299][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 3183.291302][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 3183.291305][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 3183.291311][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 3183.291315][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 3183.291318][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 3183.291321][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 3183.291325][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 3183.291332][ C2] handle_softirqs (kernel/softirq.c:580) 
[ 3183.291337][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 3183.291340][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 3183.291342][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 3183.291345][    C2]  </IRQ>
[ 3183.291346][    C2]  <TASK>
[ 3183.291348][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 3183.291351][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 3183.291355][ C2] 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
[ 3183.291358][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000242
[ 3183.291361][    C2] RAX: 0000000002a152d3 RBX: 1ffff92000028fc1 RCX: ffffffffb966a5f9
[ 3183.291363][    C2] RDX: 0000000000000000 RSI: ffffffffba315cea RDI: ffffffffb9a568c0
[ 3183.291365][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100d9e66fa
[ 3183.291366][    C2] R10: ffff88806cf337d3 R11: ffffffffbaa11288 R12: 0000000000000000
[ 3183.291368][    C2] R13: ffff888001b62300 R14: dffffc0000000000 R15: 0000000000000000
[ 3183.291372][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 3183.291378][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 3183.291380][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 3183.291383][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 3183.291386][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 3183.291389][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 3183.291393][ C2] do_idle (kernel/sched/idle.c:325) 
[ 3183.291397][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 3183.291399][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 3183.291403][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 3183.291408][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [ 3183.309286][    C2] RCU nest depth: 0, expected: 0
| [ 3183.309469][    C2] INFO: lockdep is turned off.
| [ 3183.309658][    C2] Preemption disabled at:
| [ 3183.309660][ C2] 0x0 
[ 3183.310002][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 3183.310004][    C2] Call Trace:
[ 3183.310006][    C2]  <IRQ>
[ 3183.310009][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 3183.310018][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 3183.310027][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 3183.310032][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 3183.310034][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 3183.310040][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 3183.310045][ C2] ? 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) 
[ 3183.310051][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 3183.310054][ C2] ? 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) 
[ 3183.310057][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 3183.310065][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 3183.310069][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 3183.310074][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 3183.310077][ C2] ? __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) 
[ 3183.310082][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 3183.310087][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 3183.310090][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 3183.310095][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 3183.310100][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 3183.310104][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 3183.310107][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 3183.310110][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 3183.310113][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 3183.310115][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 3183.310118][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 3183.310120][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 3183.310125][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 3183.310132][ C2] __put_net (net/core/net_namespace.c:732) 
[ 3183.310138][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 3183.310142][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 3183.310145][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 3183.310151][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 3183.310155][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 3183.310159][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 3183.310162][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 3183.310168][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 3183.310172][ C2] handle_softirqs (kernel/softirq.c:580) 
[ 3183.310178][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 3183.310180][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 3183.310183][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 3183.310186][    C2]  </IRQ>
[ 3183.310187][    C2]  <TASK>
[ 3183.310189][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 3183.310191][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 3183.310195][ C2] 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
[ 3183.310198][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000242
[ 3183.310201][    C2] RAX: 0000000002a152d3 RBX: 1ffff92000028fc1 RCX: ffffffffb966a5f9
[ 3183.310203][    C2] RDX: 0000000000000000 RSI: ffffffffba315cea RDI: ffffffffb9a568c0
[ 3183.310205][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100d9e66fa
[ 3183.310206][    C2] R10: ffff88806cf337d3 R11: ffffffffbaa11288 R12: 0000000000000000
[ 3183.310208][    C2] R13: ffff888001b62300 R14: dffffc0000000000 R15: 0000000000000000
[ 3183.310212][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 3183.310218][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 3183.310220][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 3183.310222][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 3183.310225][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 3183.310228][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 3183.310233][ C2] do_idle (kernel/sched/idle.c:325) 
[ 3183.310236][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 3183.310238][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 3183.310242][ C2] ? __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