======================================
| [   13.660153][    C3] 1 lock held by swapper/3/0:
| [ 13.660346][ C3] #0: ffffffff90b74480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   13.660725][    C3]
| [   13.660725][    C3] stack backtrace:
[   13.660963][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.660966][    C3] Call Trace:
[   13.660968][    C3]  <IRQ>
[ 13.660971][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.660979][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 13.660985][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 13.660989][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 13.660995][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 13.661001][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 13.661005][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 13.661007][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 13.661012][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 13.661015][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.661021][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.661024][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 13.661027][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.661030][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 13.661035][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.661037][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 13.661041][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 13.661047][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 13.661054][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.661057][ 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) 
[ 13.661063][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.661067][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.661071][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.661076][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 13.661080][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.661084][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.661088][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.661092][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.661094][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.661097][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 13.661099][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.661101][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.661105][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 13.661113][ C3] __put_net (net/core/net_namespace.c:732) 
[ 13.661116][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 13.661120][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.661123][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.661127][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 13.661132][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 13.661136][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.661140][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 13.661143][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 13.661148][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 13.661152][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 13.661157][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.661160][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.661162][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   13.661165][    C3]  </IRQ>
[   13.661167][    C3]  <TASK>
[ 13.661168][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.661171][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.661175][ 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
[   13.661179][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   13.661183][    C3] RAX: 00000000000360ad RBX: 1ffff9200002afc1 RCX: ffffffff8fb68a19
[   13.661185][    C3] RDX: 0000000000000000 RSI: ffffffff906881e1 RDI: ffffffff8fe50e20
[   13.661187][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   13.661189][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   13.661190][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 13.661194][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.661200][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.661203][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.661205][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.661208][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.661211][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 13.661216][ C3] do_idle (kernel/sched/idle.c:325) 
[ 13.661219][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.661222][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.661224][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 13.661228][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   13.678899][    C3] RCU nest depth: 0, expected: 0
| [   13.679073][    C3] INFO: lockdep is turned off.
| [   13.679343][    C3] Preemption disabled at:
| [ 13.679345][ C3] 0x0 
[   13.679653][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.679657][    C3] Call Trace:
[   13.679660][    C3]  <IRQ>
[ 13.679663][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.679676][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 13.679697][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 13.679703][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 13.679707][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 13.679714][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.679720][ 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) 
[ 13.679727][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 13.679730][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 13.679737][ 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) 
[ 13.679741][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 13.679745][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 13.679752][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.679755][ 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) 
[ 13.679762][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.679767][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.679770][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.679776][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 13.679780][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.679785][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.679788][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.679792][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.679794][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.679798][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 13.679800][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.679802][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.679806][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 13.679814][ C3] __put_net (net/core/net_namespace.c:732) 
[ 13.679818][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 13.679822][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.679825][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.679829][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 13.679835][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 13.679839][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.679844][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 13.679847][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 13.679852][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 13.679856][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 13.679861][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.679863][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.679866][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   13.679869][    C3]  </IRQ>
[   13.679870][    C3]  <TASK>
[ 13.679871][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.679874][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.679879][ 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
[   13.679881][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   13.679886][    C3] RAX: 00000000000360ad RBX: 1ffff9200002afc1 RCX: ffffffff8fb68a19
[   13.679888][    C3] RDX: 0000000000000000 RSI: ffffffff906881e1 RDI: ffffffff8fe50e20
[   13.679890][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   13.679892][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   13.679894][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 13.679898][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.679904][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.679907][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.679909][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.679912][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.679915][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 13.679920][ C3] do_idle (kernel/sched/idle.c:325) 
[ 13.679923][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.679926][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.679928][ 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