======================================
| [   12.458305][    C3] 1 lock held by swapper/3/0:
| [ 12.458494][ C3] #0: ffffffffba3774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   12.458833][    C3]
| [   12.458833][    C3] stack backtrace:
[   12.459068][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.459070][    C3] Call Trace:
[   12.459072][    C3]  <IRQ>
[ 12.459075][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 12.459080][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 12.459085][ C3] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 12.459090][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 12.459094][ C3] ? save_trace (kernel/locking/lockdep.c:595) 
[ 12.459099][ C3] mark_lock (kernel/locking/lockdep.c:4756) 
[ 12.459103][ C3] mark_usage (kernel/locking/lockdep.c:4645) 
[ 12.459106][ C3] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 12.459109][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 12.459114][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 12.459117][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 12.459120][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 12.459125][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 12.459128][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 12.459131][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 12.459135][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 12.459137][ C3] simple_pin_fs (fs/libfs.c:1067) 
[ 12.459140][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 12.459144][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 12.459148][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 12.459151][ 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) 
[ 12.459156][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.459159][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 12.459162][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 12.459165][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 12.459169][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.459172][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.459176][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.459178][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.459180][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.459184][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 12.459187][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.459190][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 12.459193][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 12.459200][ C3] __put_net (net/core/net_namespace.c:732) 
[ 12.459204][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 12.459208][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.459211][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.459214][ C3] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 12.459218][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 12.459222][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 12.459225][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 12.459229][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 12.459234][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 12.459239][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 12.459244][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 12.459248][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 12.459251][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   12.459254][    C3]  </IRQ>
[   12.459255][    C3]  <TASK>
[ 12.459257][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.459260][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.459264][ C3] Code: 92 b4 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 07 0f 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:	92                   	xchg   %eax,%edx
   1:	b4 00                	mov    $0x0,%ah
   3:	c3                   	ret
   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 07 0f 00 	verw   0xf0783(%rip)        # 0xf07ab
  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
[   12.459266][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   12.459269][    C3] RAX: 000000000003ace5 RBX: 1ffff9200002afc1 RCX: ffffffffb93a35d9
[   12.459272][    C3] RDX: 0000000000000000 RSI: ffffffffb9e9175c RDI: ffffffffb9653ca0
[   12.459273][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c366fa
[   12.459275][    C3] R10: ffff8880361b37d3 R11: ffffffffba011288 R12: 0000000000000000
[   12.459276][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 12.459280][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 12.459285][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.459287][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.459290][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.459293][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 12.459297][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 12.459302][ C3] do_idle (kernel/sched/idle.c:325) 
[ 12.459306][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.459309][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 12.459312][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 12.459317][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   12.475012][    C3] RCU nest depth: 0, expected: 0
| [   12.475183][    C3] INFO: lockdep is turned off.
| [   12.475354][    C3] Preemption disabled at:
| [ 12.475356][ C3] 0x0 
[   12.475677][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.475678][    C3] Call Trace:
[   12.475680][    C3]  <IRQ>
[ 12.475682][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 12.475688][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 12.475695][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 12.475699][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 12.475702][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 12.475707][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 12.475712][ 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) 
[ 12.475716][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 12.475719][ 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) 
[ 12.475721][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 12.475727][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 12.475730][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 12.475734][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 12.475736][ 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) 
[ 12.475741][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.475745][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 12.475747][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 12.475752][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 12.475756][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.475760][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.475763][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.475766][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.475768][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.475771][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 12.475774][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.475777][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 12.475780][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 12.475788][ C3] __put_net (net/core/net_namespace.c:732) 
[ 12.475791][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 12.475795][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.475798][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.475802][ C3] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 12.475806][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 12.475809][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 12.475814][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 12.475818][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 12.475823][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 12.475827][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 12.475833][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 12.475836][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 12.475839][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   12.475843][    C3]  </IRQ>
[   12.475844][    C3]  <TASK>
[ 12.475845][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.475848][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.475851][ C3] Code: 92 b4 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 07 0f 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:	92                   	xchg   %eax,%edx
   1:	b4 00                	mov    $0x0,%ah
   3:	c3                   	ret
   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 07 0f 00 	verw   0xf0783(%rip)        # 0xf07ab
  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
[   12.475854][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   12.475856][    C3] RAX: 000000000003ace5 RBX: 1ffff9200002afc1 RCX: ffffffffb93a35d9
[   12.475859][    C3] RDX: 0000000000000000 RSI: ffffffffb9e9175c RDI: ffffffffb9653ca0
[   12.475860][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c366fa
[   12.475862][    C3] R10: ffff8880361b37d3 R11: ffffffffba011288 R12: 0000000000000000
[   12.475863][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 12.475867][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 12.475872][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.475874][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.475876][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.475880][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 12.475884][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 12.475889][ C3] do_idle (kernel/sched/idle.c:325) 
[ 12.475892][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.475895][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 12.475898][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 


Finger prints:
__might_resched:down_write:simple_recursive_removal:debugfs_remove:ref_tracker_dir_exit
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock