======================================
| [   15.740328][    C1] 1 lock held by swapper/1/0:
| [ 15.740530][ C1] #0: ffffffff86775140 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.740903][    C1]
| [   15.740903][    C1] stack backtrace:
[   15.741158][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.741160][    C1] Call Trace:
[   15.741162][    C1]  <IRQ>
[ 15.741165][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.741170][ C1] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.741175][ C1] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.741179][ C1] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.741184][ C1] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.741188][ C1] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.741192][ C1] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.741195][ C1] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.741200][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.741203][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.741206][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.741211][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.741213][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.741217][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.741220][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.741222][ C1] simple_pin_fs (fs/libfs.c:1066) 
[ 15.741225][ C1] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.741228][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.741234][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.741237][ 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:2366) 
[ 15.741242][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.741244][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.741248][ C1] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.741250][ C1] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.741254][ C1] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.741258][ C1] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.741261][ C1] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.741263][ C1] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.741266][ C1] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.741269][ C1] ? do_idle (kernel/sched/idle.c:325) 
[ 15.741272][ C1] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.741274][ C1] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.741277][ C1] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.741285][ C1] __put_net (net/core/net_namespace.c:732) 
[ 15.741288][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.741292][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.741294][ C1] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.741299][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.741302][ C1] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 15.741306][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.741309][ C1] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.741313][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.741318][ C1] handle_softirqs (kernel/softirq.c:580) 
[ 15.741323][ C1] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.741326][ C1] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.741329][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.741332][    C1]  </IRQ>
[   15.741333][    C1]  <TASK>
[ 15.741335][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.741338][ C1] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.741341][ C1] Code: a0 d1 00 e9 c3 57 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 c3 45 2b 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 d1 00 e9 c3 57 02 	movabs 0xf000257c3e900d1,%al
   7:	00 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 c3 45 2b 00 	verw   0x2b45c3(%rip)        # 0x2b45eb
  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
[   15.741344][    C1] RSP: 0018:ffffc90000137de8 EFLAGS: 00000246
[   15.741347][    C1] RAX: 000000000008eeff RBX: 1ffff92000026fc1 RCX: ffffffff855dea19
[   15.741349][    C1] RDX: 0000000000000000 RSI: ffffffff8629db3e RDI: ffffffff85a56260
[   15.741351][    C1] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005e5667a
[   15.741353][    C1] R10: ffff88802f2b33d3 R11: 0000000000000000 R12: 0000000000000000
[   15.741355][    C1] R13: ffff888001bf0040 R14: dffffc0000000000 R15: 0000000000000000
[ 15.741359][ C1] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.741365][ C1] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.741367][ C1] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.741370][ C1] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.741373][ C1] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.741377][ C1] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.741382][ C1] do_idle (kernel/sched/idle.c:325) 
[ 15.741385][ C1] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.741388][ C1] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.741391][ C1] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.741396][ C1] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.757847][    C1] RCU nest depth: 0, expected: 0
| [   15.758036][    C1] INFO: lockdep is turned off.
| [   15.758223][    C1] Preemption disabled at:
| [ 15.758224][ C1] 0x0 
[   15.758556][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.758558][    C1] Call Trace:
[   15.758560][    C1]  <IRQ>
[ 15.758561][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.758568][ C1] __might_resched (kernel/sched/core.c:8819) 
[ 15.758575][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.758578][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.758581][ C1] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.758585][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.758590][ 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) 
[ 15.758595][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.758598][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.758602][ 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) 
[ 15.758607][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.758610][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.758616][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.758619][ 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:2366) 
[ 15.758623][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.758626][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.758629][ C1] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.758633][ C1] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.758637][ C1] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.758641][ C1] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.758644][ C1] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.758646][ C1] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.758649][ C1] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.758652][ C1] ? do_idle (kernel/sched/idle.c:325) 
[ 15.758654][ C1] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.758657][ C1] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.758661][ C1] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.758667][ C1] __put_net (net/core/net_namespace.c:732) 
[ 15.758670][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.758674][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.758676][ C1] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.758681][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.758684][ C1] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 15.758687][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.758691][ C1] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.758696][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.758700][ C1] handle_softirqs (kernel/softirq.c:580) 
[ 15.758705][ C1] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.758708][ C1] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.758711][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.758715][    C1]  </IRQ>
[   15.758716][    C1]  <TASK>
[ 15.758717][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.758720][ C1] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.758723][ C1] Code: a0 d1 00 e9 c3 57 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 c3 45 2b 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 d1 00 e9 c3 57 02 	movabs 0xf000257c3e900d1,%al
   7:	00 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 c3 45 2b 00 	verw   0x2b45c3(%rip)        # 0x2b45eb
  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
[   15.758726][    C1] RSP: 0018:ffffc90000137de8 EFLAGS: 00000246
[   15.758729][    C1] RAX: 000000000008eeff RBX: 1ffff92000026fc1 RCX: ffffffff855dea19
[   15.758731][    C1] RDX: 0000000000000000 RSI: ffffffff8629db3e RDI: ffffffff85a56260
[   15.758732][    C1] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005e5667a
[   15.758734][    C1] R10: ffff88802f2b33d3 R11: 0000000000000000 R12: 0000000000000000
[   15.758736][    C1] R13: ffff888001bf0040 R14: dffffc0000000000 R15: 0000000000000000
[ 15.758740][ C1] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.758746][ C1] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.758748][ C1] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.758750][ C1] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.758753][ C1] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.758757][ C1] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.758761][ C1] do_idle (kernel/sched/idle.c:325) 
[ 15.758765][ C1] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.758768][ C1] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.758771][ 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