======================================
| [   13.585896][    C3] 1 lock held by swapper/3/0:
| [ 13.586109][ C3] #0: ffffffffbd3774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   13.586480][    C3]
| [   13.586480][    C3] stack backtrace:
[   13.586747][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.586750][    C3] Call Trace:
[   13.586753][    C3]  <IRQ>
[ 13.586756][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.586764][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 13.586769][ C3] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 13.586774][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 13.586780][ C3] ? save_trace (kernel/locking/lockdep.c:595) 
[ 13.586784][ C3] mark_lock (kernel/locking/lockdep.c:4756) 
[ 13.586788][ C3] mark_usage (kernel/locking/lockdep.c:4645) 
[ 13.586792][ C3] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 13.586795][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 13.586799][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 13.586803][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 13.586807][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.586813][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 13.586816][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 13.586820][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 13.586823][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 13.586825][ C3] simple_pin_fs (fs/libfs.c:1067) 
[ 13.586828][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 13.586832][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 13.586838][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.586841][ 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) 
[ 13.586847][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.586850][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.586853][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.586856][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 13.586861][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.586866][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 13.586869][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 13.586871][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.586874][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.586879][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 13.586882][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.586884][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.586889][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 13.586898][ C3] __put_net (net/core/net_namespace.c:732) 
[ 13.586903][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 13.586907][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.586910][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.586913][ C3] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 13.586917][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 13.586921][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.586925][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 13.586929][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 13.586934][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 13.586939][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 13.586945][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.586948][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.586951][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   13.586955][    C3]  </IRQ>
[   13.586956][    C3]  <TASK>
[ 13.586957][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.586960][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 13.586965][ C3] Code: a2 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 17 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:	a2 b4 00 c3 cc cc cc 	movabs %al,0xfccccccccc300b4
   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 83 17 0f 00 	verw   0xf1783(%rip)        # 0xf17ab
  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
[   13.586968][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   13.586972][    C3] RAX: 000000000003e2ef RBX: 1ffff9200002afc1 RCX: ffffffffbc3a25d9
[   13.586974][    C3] RDX: 0000000000000000 RSI: ffffffffbce9175c RDI: ffffffffbc653ca0
[   13.586976][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c366fa
[   13.586977][    C3] R10: ffff8880361b37d3 R11: ffffffffbd011288 R12: 0000000000000000
[   13.586979][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 13.586983][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.586988][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 13.586990][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.586993][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.586996][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.587000][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 13.587005][ C3] do_idle (kernel/sched/idle.c:325) 
[ 13.587009][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.587012][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.587016][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 13.587021][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   13.605058][    C3] RCU nest depth: 0, expected: 0
| [   13.605357][    C3] INFO: lockdep is turned off.
| [   13.605545][    C3] Preemption disabled at:
| [ 13.605547][ C3] 0x0 
[   13.605891][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.605894][    C3] Call Trace:
[   13.605896][    C3]  <IRQ>
[ 13.605899][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.605908][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 13.605918][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 13.605922][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 13.605925][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 13.605931][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.605938][ 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) 
[ 13.605943][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 13.605946][ 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) 
[ 13.605949][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 13.605955][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 13.605959][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 13.605964][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.605967][ 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) 
[ 13.605973][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.605978][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.605981][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.605987][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 13.605993][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.605997][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 13.606001][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 13.606006][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.606008][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.606013][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 13.606016][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.606019][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.606023][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 13.606031][ C3] __put_net (net/core/net_namespace.c:732) 
[ 13.606036][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 13.606040][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.606043][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.606047][ C3] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 13.606051][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 13.606055][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.606060][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 13.606064][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 13.606069][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 13.606074][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 13.606080][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.606083][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.606086][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   13.606090][    C3]  </IRQ>
[   13.606091][    C3]  <TASK>
[ 13.606093][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.606096][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 13.606100][ C3] Code: a2 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 17 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:	a2 b4 00 c3 cc cc cc 	movabs %al,0xfccccccccc300b4
   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 83 17 0f 00 	verw   0xf1783(%rip)        # 0xf17ab
  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
[   13.606103][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   13.606107][    C3] RAX: 000000000003e2ef RBX: 1ffff9200002afc1 RCX: ffffffffbc3a25d9
[   13.606109][    C3] RDX: 0000000000000000 RSI: ffffffffbce9175c RDI: ffffffffbc653ca0
[   13.606110][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c366fa
[   13.606112][    C3] R10: ffff8880361b37d3 R11: ffffffffbd011288 R12: 0000000000000000
[   13.606114][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 13.606118][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.606122][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 13.606125][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.606127][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.606131][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.606135][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 13.606140][ C3] do_idle (kernel/sched/idle.c:325) 
[ 13.606144][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.606147][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.606150][ 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