======================================
| [  275.892338][    C3] 1 lock held by swapper/3/0:
| [ 275.892554][ C3] #0: ffffffffaf577c00 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [  275.893058][    C3]
| [  275.893058][    C3] stack backtrace:
[  275.893690][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  275.893693][    C3] Call Trace:
[  275.893695][    C3]  <IRQ>
[ 275.893698][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 275.893704][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 275.893710][ C3] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 275.893715][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 275.893721][ C3] ? save_trace (kernel/locking/lockdep.c:595) 
[ 275.893725][ C3] mark_lock (kernel/locking/lockdep.c:4756) 
[ 275.893730][ C3] mark_usage (kernel/locking/lockdep.c:4645) 
[ 275.893733][ C3] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 275.893737][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 275.893742][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 275.893745][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 275.893750][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 275.893755][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 275.893758][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 275.893763][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 275.893766][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 275.893770][ C3] simple_pin_fs (fs/libfs.c:1067) 
[ 275.893774][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 275.893778][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 275.893784][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 275.893787][ 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:2376) 
[ 275.893792][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 275.893796][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 275.893799][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 275.893801][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 275.893805][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 275.893809][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 275.893812][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 275.893814][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 275.893817][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 275.893820][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 275.893823][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 275.893826][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 275.893830][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 275.893836][ C3] __put_net (net/core/net_namespace.c:732) 
[ 275.893840][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 275.893844][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 275.893847][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 275.893850][ C3] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 275.893854][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 275.893857][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 275.893861][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 275.893865][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 275.893869][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 275.893873][ C3] handle_softirqs (kernel/softirq.c:580) 
[ 275.893879][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 275.893882][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 275.893884][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[  275.893888][    C3]  </IRQ>
[  275.893889][    C3]  <TASK>
[ 275.893890][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 275.893893][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 275.893897][ C3] Code: f2 ce 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 83 17 28 00 fb f4 <e9> fc 54 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	f2 ce                	repnz (bad)
   2:	00 c3                	add    %al,%bl
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   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 83 17 28 00 	verw   0x281783(%rip)        # 0x2817ab
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	e9 fc 54 02 00       	jmp    0x2552b		<-- trapping instruction
  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:	e9 fc 54 02 00       	jmp    0x25501
   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
[  275.893900][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[  275.893903][    C3] RAX: 00000000003d4e7b RBX: 1ffff9200002afc1 RCX: ffffffffae4125d9
[  275.893906][    C3] RDX: 0000000000000000 RSI: ffffffffaf0a61cd RDI: ffffffffae858be0
[  275.893908][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005e766fa
[  275.893909][    C3] R10: ffff88802f3b37d3 R11: ffffffffaf211288 R12: 0000000000000000
[  275.893911][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 275.893915][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 275.893919][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 275.893922][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 275.893924][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 275.893928][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 275.893932][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 275.893937][ C3] do_idle (kernel/sched/idle.c:325) 
[ 275.893941][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 275.893945][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 275.893948][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 275.893953][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [  275.913881][    C3] RCU nest depth: 0, expected: 0
| [  275.914080][    C3] INFO: lockdep is turned off.
| [  275.914282][    C3] Preemption disabled at:
| [ 275.914284][ C3] 0x0 
[  275.914966][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  275.914968][    C3] Call Trace:
[  275.914970][    C3]  <IRQ>
[ 275.914973][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 275.914980][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 275.914986][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 275.914990][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 275.914993][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 275.914997][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 275.915003][ 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) 
[ 275.915008][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 275.915011][ 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) 
[ 275.915014][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 275.915020][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 275.915023][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 275.915029][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 275.915032][ 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:2376) 
[ 275.915037][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 275.915041][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 275.915045][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 275.915048][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 275.915052][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 275.915055][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 275.915058][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 275.915061][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 275.915064][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 275.915068][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 275.915071][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 275.915074][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 275.915077][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 275.915083][ C3] __put_net (net/core/net_namespace.c:732) 
[ 275.915087][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 275.915091][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 275.915094][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 275.915098][ C3] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 275.915102][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 275.915106][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 275.915111][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 275.915115][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 275.915119][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 275.915124][ C3] handle_softirqs (kernel/softirq.c:580) 
[ 275.915130][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 275.915134][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 275.915136][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[  275.915140][    C3]  </IRQ>
[  275.915141][    C3]  <TASK>
[ 275.915143][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 275.915146][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 275.915150][ C3] Code: f2 ce 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 83 17 28 00 fb f4 <e9> fc 54 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	f2 ce                	repnz (bad)
   2:	00 c3                	add    %al,%bl
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   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 83 17 28 00 	verw   0x281783(%rip)        # 0x2817ab
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	e9 fc 54 02 00       	jmp    0x2552b		<-- trapping instruction
  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:	e9 fc 54 02 00       	jmp    0x25501
   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
[  275.915152][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[  275.915155][    C3] RAX: 00000000003d4e7b RBX: 1ffff9200002afc1 RCX: ffffffffae4125d9
[  275.915157][    C3] RDX: 0000000000000000 RSI: ffffffffaf0a61cd RDI: ffffffffae858be0
[  275.915159][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005e766fa
[  275.915161][    C3] R10: ffff88802f3b37d3 R11: ffffffffaf211288 R12: 0000000000000000
[  275.915163][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 275.915166][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 275.915171][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 275.915174][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 275.915176][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 275.915180][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 275.915184][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 275.915189][ C3] do_idle (kernel/sched/idle.c:325) 
[ 275.915193][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 275.915197][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 275.915200][ 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