======================================
| [   20.803367][    C3] 1 lock held by ksoftirqd/3/32:
| [ 20.803557][ C3] #0: ffffffffb9f774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   20.803947][    C3]
| [   20.803947][    C3] stack backtrace:
[   20.804209][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.804212][    C3] Call Trace:
[   20.804215][    C3]  <TASK>
[ 20.804219][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.804231][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 20.804238][ C3] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 20.804243][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 20.804250][ C3] ? save_trace (kernel/locking/lockdep.c:595) 
[ 20.804256][ C3] mark_lock (kernel/locking/lockdep.c:4756) 
[ 20.804260][ C3] mark_usage (kernel/locking/lockdep.c:4645) 
[ 20.804263][ C3] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 20.804267][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 20.804271][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 20.804274][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 20.804279][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.804284][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 20.804287][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 20.804293][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 20.804299][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 20.804303][ C3] simple_pin_fs (fs/libfs.c:1067) 
[ 20.804307][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 20.804311][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 20.804319][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 20.804323][ 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) 
[ 20.804331][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.804334][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 20.804338][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.804344][ C3] ? kthread (kernel/kthread.c:464) 
[ 20.804347][ C3] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.804351][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 20.804356][ C3] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 20.804364][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 20.804372][ C3] __put_net (net/core/net_namespace.c:732) 
[ 20.804380][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 20.804388][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.804392][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.804400][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 20.804406][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.804410][ C3] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 20.804415][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 20.804421][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 20.804429][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 20.804434][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 20.804438][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 20.804440][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.804444][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 20.804448][ C3] kthread (kernel/kthread.c:464) 
[ 20.804451][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.804453][ C3] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 20.804456][ C3] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 20.804460][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.804463][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.804466][ C3] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.804468][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.804472][ C3] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   20.817194][    C3] RCU nest depth: 0, expected: 0
| [   20.817388][    C3] INFO: lockdep is turned off.
| [   20.817587][    C3] Preemption disabled at:
| [ 20.817589][ C3] handle_softirqs (kernel/softirq.c:553) 
[   20.817999][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.818001][    C3] Call Trace:
[   20.818003][    C3]  <TASK>
[ 20.818005][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.818014][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 20.818021][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 20.818026][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 20.818029][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 20.818033][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.818038][ 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) 
[ 20.818045][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 20.818047][ 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) 
[ 20.818051][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 20.818056][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 20.818059][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 20.818065][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 20.818069][ 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) 
[ 20.818075][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.818079][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 20.818082][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.818086][ C3] ? kthread (kernel/kthread.c:464) 
[ 20.818089][ C3] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.818094][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 20.818100][ C3] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 20.818105][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 20.818112][ C3] __put_net (net/core/net_namespace.c:732) 
[ 20.818116][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 20.818120][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.818123][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.818127][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 20.818131][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.818134][ C3] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 20.818137][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 20.818141][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 20.818145][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 20.818150][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 20.818154][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 20.818156][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.818160][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 20.818166][ C3] kthread (kernel/kthread.c:464) 
[ 20.818170][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.818174][ C3] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 20.818177][ C3] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 20.818180][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.818183][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.818186][ C3] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.818189][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.818191][ C3] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   26.098197][    C3] INFO: lockdep is turned off.
| [   26.098400][    C3] Preemption disabled at:
| [ 26.098402][ C3] 0x0 
| [   26.098766][    C3] Tainted: [W]=WARN
[   26.098768][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   26.098770][    C3] Call Trace:
[   26.098772][    C3]  <IRQ>
[ 26.098774][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 26.098782][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 26.098789][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 26.098793][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 26.098796][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 26.098800][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 26.098806][ 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) 
[ 26.098812][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 26.098814][ 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) 
[ 26.098818][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 26.098823][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 26.098826][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 26.098832][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 26.098836][ 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) 
[ 26.098842][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 26.098845][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 26.098848][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 26.098854][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 26.098860][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 26.098864][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 26.098867][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 26.098870][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 26.098873][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 26.098878][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 26.098880][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 26.098883][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 26.098887][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 26.098895][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 26.098901][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 26.098905][ C3] __put_net (net/core/net_namespace.c:732) 
[ 26.098908][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 26.098913][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 26.098915][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 26.098922][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 26.098926][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 26.098932][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 26.098938][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 26.098943][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 26.098948][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 26.098951][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 26.098954][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   26.098958][    C3]  </IRQ>
[   26.098959][    C3]  <TASK>
[ 26.098960][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 26.098963][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 26.098967][ C3] Code: 92 b5 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 37 10 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:	b5 00                	mov    $0x0,%ch
   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 37 10 00 	verw   0x103783(%rip)        # 0x1037ab
  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
[   26.098970][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   26.098973][    C3] RAX: 0000000000000003 RBX: 1ffff9200002afc1 RCX: ffffffffb8f905d9
[   26.098976][    C3] RDX: ffffed1006c366fb RSI: ffffffffb9253b60 RDI: ffffffffb678d18f
[   26.098977][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c366fa
[   26.098979][    C3] R10: ffff8880361b37d3 R11: ffffffffbc870108 R12: 0000000000000000
[   26.098981][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 26.098985][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 26.098988][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 26.098991][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 26.098994][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 26.098997][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 26.099000][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 26.099004][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 26.099008][ C3] do_idle (kernel/sched/idle.c:325) 
[ 26.099012][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 26.099015][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 26.099017][ 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
handle_softirqs:dump_stack_lvl:__might_resched:down_write:simple_recursive_removal