======================================
| [   15.960842][    C0] 1 lock held by ksoftirqd/0/14:
| [ 15.961028][ C0] #0: ffffffffb11774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   15.961357][    C0]
| [   15.961357][    C0] stack backtrace:
[   15.961590][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.961592][    C0] Call Trace:
[   15.961594][    C0]  <TASK>
[ 15.961597][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.961603][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 15.961608][ C0] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 15.961612][ C0] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.961617][ C0] ? save_trace (kernel/locking/lockdep.c:595) 
[ 15.961623][ C0] mark_lock (kernel/locking/lockdep.c:4756) 
[ 15.961626][ C0] mark_usage (kernel/locking/lockdep.c:4645) 
[ 15.961629][ C0] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 15.961633][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 15.961637][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 15.961640][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.961644][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.961648][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 15.961650][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.961655][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.961658][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.961661][ C0] simple_pin_fs (fs/libfs.c:1067) 
[ 15.961665][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.961668][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 15.961674][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.961678][ C0] ? __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) 
[ 15.961683][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.961686][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.961689][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.961694][ C0] ? kthread (kernel/kthread.c:464) 
[ 15.961696][ C0] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.961699][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.961702][ C0] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 15.961706][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 15.961712][ C0] __put_net (net/core/net_namespace.c:732) 
[ 15.961715][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.961719][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.961722][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.961725][ C0] ? sched_balance_domains (kernel/sched/fair.c:12268) 
[ 15.961730][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.961733][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.961736][ C0] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 15.961739][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.961743][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.961748][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 15.961752][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.961755][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.961758][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.961762][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.961766][ C0] kthread (kernel/kthread.c:464) 
[ 15.961769][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.961771][ C0] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 15.961773][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 15.961777][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.961780][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.961783][ C0] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.961785][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.961788][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   15.972367][    C0] RCU nest depth: 0, expected: 0
| [   15.972530][    C0] INFO: lockdep is turned off.
| [   15.972688][    C0] Preemption disabled at:
| [ 15.972689][ C0] handle_softirqs (kernel/softirq.c:553) 
[   15.973016][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.973018][    C0] Call Trace:
[   15.973020][    C0]  <TASK>
[ 15.973021][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.973027][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 15.973033][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.973036][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.973039][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 15.973043][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.973047][ C0] ? 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) 
[ 15.973052][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 15.973055][ C0] ? 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) 
[ 15.973058][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.973063][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.973066][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 15.973071][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.973074][ C0] ? __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) 
[ 15.973078][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.973081][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.973084][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.973088][ C0] ? kthread (kernel/kthread.c:464) 
[ 15.973091][ C0] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.973094][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.973098][ C0] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 15.973101][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 15.973107][ C0] __put_net (net/core/net_namespace.c:732) 
[ 15.973110][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.973114][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.973117][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.973120][ C0] ? sched_balance_domains (kernel/sched/fair.c:12268) 
[ 15.973124][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.973128][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.973130][ C0] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 15.973133][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.973138][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.973141][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 15.973145][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.973149][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.973152][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.973156][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.973160][ C0] kthread (kernel/kthread.c:464) 
[ 15.973163][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.973165][ C0] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 15.973167][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 15.973171][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.973174][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.973177][ C0] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.973179][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.973182][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   18.230521][    C2] INFO: lockdep is turned off.
| [   18.230709][    C2] Preemption disabled at:
| [ 18.230710][ C2] 0x0 
| [   18.231048][    C2] Tainted: [W]=WARN
[   18.231050][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.231052][    C2] Call Trace:
[   18.231054][    C2]  <IRQ>
[ 18.231056][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.231064][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 18.231071][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 18.231076][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 18.231079][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 18.231083][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.231088][ C2] ? 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) 
[ 18.231094][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 18.231097][ C2] ? 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) 
[ 18.231101][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 18.231106][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 18.231109][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 18.231116][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 18.231119][ C2] ? __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) 
[ 18.231124][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.231128][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 18.231131][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 18.231136][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 18.231142][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.231146][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 18.231149][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 18.231152][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 18.231154][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.231158][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 18.231160][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 18.231162][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 18.231166][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 18.231172][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 18.231176][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.231180][ C2] __put_net (net/core/net_namespace.c:732) 
[ 18.231184][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 18.231188][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.231190][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.231195][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 18.231198][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 18.231204][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 18.231210][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 18.231215][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 18.231220][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 18.231223][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 18.231226][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   18.231230][    C2]  </IRQ>
[   18.231231][    C2]  <TASK>
[ 18.231232][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.231235][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 18.231239][ C2] Code: a2 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 47 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:	a2 b5 00 c3 cc cc cc 	movabs %al,0xfccccccccc300b5
   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 47 10 00 	verw   0x104783(%rip)        # 0x1047ab
  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
[   18.231242][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   18.231245][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffffb018f5d9
[   18.231248][    C2] RDX: ffffed1006c266fb RSI: ffffffffb0453b60 RDI: ffffffffad98d18f
[   18.231249][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c266fa
[   18.231251][    C2] R10: ffff8880361337d3 R11: ffff888001ee2818 R12: 0000000000000000
[   18.231253][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 18.231257][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 18.231260][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.231263][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 18.231266][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 18.231269][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.231272][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 18.231275][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 18.231280][ C2] do_idle (kernel/sched/idle.c:325) 
[ 18.231283][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 18.231286][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 18.231289][ C2] ? __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