======================================
| [   13.903360][    C3] 1 lock held by swapper/3/0:
| [ 13.903679][ C3] #0: ffffffffa1774480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   13.904079][    C3]
| [   13.904079][    C3] stack backtrace:
[   13.904353][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.904355][    C3] Call Trace:
[   13.904357][    C3]  <IRQ>
[ 13.904359][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.904366][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 13.904371][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 13.904375][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 13.904379][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 13.904385][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 13.904388][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 13.904391][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 13.904395][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 13.904398][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.904403][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.904406][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 13.904409][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.904413][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 13.904416][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.904419][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 13.904422][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 13.904427][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 13.904432][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.904436][ 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) 
[ 13.904441][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.904444][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.904447][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.904451][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 13.904455][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.904458][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.904461][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.904465][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.904467][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.904470][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 13.904472][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.904475][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.904477][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 13.904483][ C3] __put_net (net/core/net_namespace.c:732) 
[ 13.904487][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 13.904490][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.904494][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.904499][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 13.904503][ C3] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 13.904506][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.904508][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.904513][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 13.904517][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 13.904521][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.904524][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.904527][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   13.904530][    C3]  </IRQ>
[   13.904531][    C3]  <TASK>
[ 13.904533][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.904535][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.904539][ 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
[   13.904542][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   13.904546][    C3] RAX: 00000000000339c7 RBX: 1ffff9200002afc1 RCX: ffffffffa0768a19
[   13.904548][    C3] RDX: 0000000000000000 RSI: ffffffffa12881e1 RDI: ffffffffa0a50e20
[   13.904550][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   13.904551][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   13.904553][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 13.904557][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.904562][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.904565][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.904567][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.904570][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.904574][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 13.904578][ C3] do_idle (kernel/sched/idle.c:325) 
[ 13.904581][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.904583][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.904586][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 13.904590][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   13.921948][    C3] RCU nest depth: 0, expected: 0
| [   13.922226][    C3] INFO: lockdep is turned off.
| [   13.922395][    C3] Preemption disabled at:
| [ 13.922397][ C3] 0x0 
[   13.922693][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.922695][    C3] Call Trace:
[   13.922697][    C3]  <IRQ>
[ 13.922698][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.922706][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 13.922712][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 13.922715][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 13.922718][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 13.922722][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.922726][ 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) 
[ 13.922732][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 13.922734][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 13.922739][ 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) 
[ 13.922744][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 13.922747][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 13.922753][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.922756][ 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) 
[ 13.922761][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.922765][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.922769][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.922773][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 13.922777][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.922781][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.922784][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.922787][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.922789][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.922792][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 13.922794][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.922796][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.922800][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 13.922806][ C3] __put_net (net/core/net_namespace.c:732) 
[ 13.922809][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 13.922813][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.922816][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.922822][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 13.922825][ C3] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 13.922828][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.922831][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.922836][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 13.922839][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 13.922844][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.922847][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.922849][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   13.922852][    C3]  </IRQ>
[   13.922853][    C3]  <TASK>
[ 13.922855][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.922857][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.922861][ 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
[   13.922864][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   13.922867][    C3] RAX: 00000000000339c7 RBX: 1ffff9200002afc1 RCX: ffffffffa0768a19
[   13.922869][    C3] RDX: 0000000000000000 RSI: ffffffffa12881e1 RDI: ffffffffa0a50e20
[   13.922871][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   13.922873][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   13.922875][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 13.922879][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.922884][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.922887][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.922889][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.922892][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.922895][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 13.922900][ C3] do_idle (kernel/sched/idle.c:325) 
[ 13.922903][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.922906][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.922908][ 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