======================================
| [   14.893340][    C3] 1 lock held by swapper/3/0:
| [ 14.893693][ C3] #0: ffffffff86574480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   14.894283][    C3]
| [   14.894283][    C3] stack backtrace:
[   14.894704][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.894708][    C3] Call Trace:
[   14.894711][    C3]  <IRQ>
[ 14.894716][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.894727][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 14.894736][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 14.894743][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 14.894752][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 14.894762][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 14.894768][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 14.894774][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 14.894782][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 14.894788][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.894796][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.894802][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 14.894806][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.894813][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 14.894820][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.894825][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 14.894830][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 14.894839][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 14.894848][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.894854][ C3] ? __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) 
[ 14.894862][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.894870][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.894875][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 14.894881][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 14.894888][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.894894][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.894899][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.894904][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.894909][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.894914][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 14.894917][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.894921][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.894927][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 14.894938][ C3] __put_net (net/core/net_namespace.c:732) 
[ 14.894945][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 14.894952][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.894957][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.894965][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 14.894972][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 14.894978][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 14.894983][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 14.894988][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 14.894995][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 14.895002][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 14.895010][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 14.895015][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 14.895020][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   14.895026][    C3]  </IRQ>
[   14.895028][    C3]  <TASK>
[ 14.895031][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.895036][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.895043][ C3] 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
[   14.895048][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   14.895053][    C3] RAX: 000000000003ddd1 RBX: 1ffff9200002afc1 RCX: ffffffff85568a19
[   14.895057][    C3] RDX: 0000000000000000 RSI: ffffffff860881e1 RDI: ffffffff85850e20
[   14.895061][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   14.895064][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   14.895068][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 14.895075][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 14.895084][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.895089][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.895093][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.895099][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 14.895105][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 14.895113][ C3] do_idle (kernel/sched/idle.c:325) 
[ 14.895119][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.895124][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.895129][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 14.895137][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   14.913838][    C3] RCU nest depth: 0, expected: 0
| [   14.914076][    C3] INFO: lockdep is turned off.
| [   14.914275][    C3] Preemption disabled at:
| [ 14.914277][ C3] 0x0 
[   14.914628][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.914631][    C3] Call Trace:
[   14.914633][    C3]  <IRQ>
[ 14.914637][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.914649][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 14.914658][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 14.914662][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 14.914665][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 14.914672][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.914678][ C3] ? 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) 
[ 14.914684][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 14.914687][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 14.914694][ C3] ? 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) 
[ 14.914699][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 14.914702][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 14.914709][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.914713][ C3] ? __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) 
[ 14.914720][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.914725][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.914729][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 14.914735][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 14.914741][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.914746][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.914749][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.914753][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.914755][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.914759][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 14.914761][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.914764][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.914768][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 14.914775][ C3] __put_net (net/core/net_namespace.c:732) 
[ 14.914780][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 14.914784][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.914788][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.914792][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 14.914798][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 14.914802][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 14.914808][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 14.914811][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 14.914816][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 14.914820][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 14.914825][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 14.914828][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 14.914830][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   14.914833][    C3]  </IRQ>
[   14.914835][    C3]  <TASK>
[ 14.914836][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.914839][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.914843][ C3] 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
[   14.914847][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   14.914851][    C3] RAX: 000000000003ddd1 RBX: 1ffff9200002afc1 RCX: ffffffff85568a19
[   14.914854][    C3] RDX: 0000000000000000 RSI: ffffffff860881e1 RDI: ffffffff85850e20
[   14.914856][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   14.914858][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   14.914860][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 14.914864][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 14.914869][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.914873][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.914875][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.914878][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 14.914881][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 14.914886][ C3] do_idle (kernel/sched/idle.c:325) 
[ 14.914889][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.914892][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.914894][ C3] ? __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