======================================
| [   13.619843][    C1] 1 lock held by swapper/1/0:
| [ 13.620028][ C1] #0: ffffffff94374480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   13.620350][    C1]
| [   13.620350][    C1] stack backtrace:
[   13.620577][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.620580][    C1] Call Trace:
[   13.620582][    C1]  <IRQ>
[ 13.620585][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.620592][ C1] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 13.620596][ C1] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 13.620600][ C1] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 13.620605][ C1] ? save_trace (kernel/locking/lockdep.c:594) 
[ 13.620611][ C1] mark_lock (kernel/locking/lockdep.c:4754) 
[ 13.620614][ C1] mark_usage (kernel/locking/lockdep.c:4643) 
[ 13.620617][ C1] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 13.620621][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 13.620624][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.620628][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.620631][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 13.620634][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.620638][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 13.620641][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.620643][ C1] simple_pin_fs (fs/libfs.c:1066) 
[ 13.620646][ C1] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 13.620650][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 13.620656][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.620660][ 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:2333) 
[ 13.620666][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.620669][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.620673][ C1] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.620675][ C1] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 13.620679][ C1] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.620684][ C1] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.620687][ C1] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.620690][ C1] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.620692][ C1] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.620696][ C1] ? do_idle (kernel/sched/idle.c:325) 
[ 13.620698][ C1] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.620700][ C1] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.620703][ C1] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 13.620711][ C1] __put_net (net/core/net_namespace.c:732) 
[ 13.620715][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 13.620718][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.620722][ C1] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.620726][ C1] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 13.620731][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 13.620735][ C1] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.620738][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 13.620742][ C1] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 13.620746][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 13.620750][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 13.620755][ C1] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.620758][ C1] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.620760][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   13.620763][    C1]  </IRQ>
[   13.620764][    C1]  <TASK>
[ 13.620766][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.620769][ C1] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.620773][ C1] 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
[   13.620776][    C1] RSP: 0018:ffffc90000137de8 EFLAGS: 00000246
[   13.620780][    C1] RAX: 0000000000061dc5 RBX: 1ffff92000026fc1 RCX: ffffffff93368a19
[   13.620782][    C1] RDX: 0000000000000000 RSI: ffffffff93e881e1 RDI: ffffffff93650e20
[   13.620784][    C1] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c1667a
[   13.620786][    C1] R10: ffff8880360b33d3 R11: 0000000000000000 R12: 0000000000000000
[   13.620788][    C1] R13: ffff888001bb0040 R14: dffffc0000000000 R15: 0000000000000000
[ 13.620792][ C1] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.620797][ C1] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.620800][ C1] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.620802][ C1] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.620805][ C1] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.620809][ C1] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 13.620813][ C1] do_idle (kernel/sched/idle.c:325) 
[ 13.620816][ C1] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.620819][ C1] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.620821][ C1] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 13.620826][ C1] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   13.636152][    C1] RCU nest depth: 0, expected: 0
| [   13.636316][    C1] INFO: lockdep is turned off.
| [   13.636490][    C1] Preemption disabled at:
| [ 13.636491][ C1] 0x0 
[   13.636896][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.636898][    C1] Call Trace:
[   13.636901][    C1]  <IRQ>
[ 13.636903][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.636912][ C1] __might_resched (kernel/sched/core.c:8819) 
[ 13.636920][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 13.636924][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 13.636926][ C1] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 13.636932][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.636938][ 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) 
[ 13.636943][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 13.636946][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 13.636952][ 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) 
[ 13.636957][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 13.636960][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 13.636966][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.636970][ 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:2333) 
[ 13.636976][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.636981][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.636984][ C1] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.636989][ C1] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 13.636993][ C1] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.636996][ C1] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.636999][ C1] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.637003][ C1] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.637005][ C1] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.637008][ C1] ? do_idle (kernel/sched/idle.c:325) 
[ 13.637010][ C1] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.637012][ C1] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.637015][ C1] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 13.637022][ C1] __put_net (net/core/net_namespace.c:732) 
[ 13.637026][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 13.637030][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.637033][ C1] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.637037][ C1] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 13.637043][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 13.637047][ C1] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.637051][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 13.637055][ C1] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 13.637059][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 13.637063][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 13.637068][ C1] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.637071][ C1] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.637073][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   13.637076][    C1]  </IRQ>
[   13.637077][    C1]  <TASK>
[ 13.637078][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.637081][ C1] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.637085][ C1] 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
[   13.637087][    C1] RSP: 0018:ffffc90000137de8 EFLAGS: 00000246
[   13.637091][    C1] RAX: 0000000000061dc5 RBX: 1ffff92000026fc1 RCX: ffffffff93368a19
[   13.637093][    C1] RDX: 0000000000000000 RSI: ffffffff93e881e1 RDI: ffffffff93650e20
[   13.637095][    C1] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c1667a
[   13.637096][    C1] R10: ffff8880360b33d3 R11: 0000000000000000 R12: 0000000000000000
[   13.637098][    C1] R13: ffff888001bb0040 R14: dffffc0000000000 R15: 0000000000000000
[ 13.637102][ C1] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.637107][ C1] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.637110][ C1] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.637112][ C1] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.637115][ C1] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.637118][ C1] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 13.637123][ C1] do_idle (kernel/sched/idle.c:325) 
[ 13.637126][ C1] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.637128][ C1] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.637131][ 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