======================================
| [   20.924668][    C1] 1 lock held by ksoftirqd/1/22:
| [ 20.924839][ C1] #0: ffffffffb41774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   20.925148][    C1]
| [   20.925148][    C1] stack backtrace:
[   20.925364][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.925366][    C1] Call Trace:
[   20.925369][    C1]  <TASK>
[ 20.925372][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.925378][ C1] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 20.925384][ C1] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 20.925388][ C1] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 20.925392][ C1] ? save_trace (kernel/locking/lockdep.c:595) 
[ 20.925398][ C1] mark_lock (kernel/locking/lockdep.c:4756) 
[ 20.925402][ C1] mark_usage (kernel/locking/lockdep.c:4645) 
[ 20.925405][ C1] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 20.925408][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 20.925412][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 20.925415][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 20.925419][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.925423][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 20.925426][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 20.925430][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 20.925434][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 20.925437][ C1] simple_pin_fs (fs/libfs.c:1067) 
[ 20.925441][ C1] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 20.925444][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 20.925450][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 20.925454][ C1] ? __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) 
[ 20.925459][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.925462][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 20.925465][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.925470][ C1] ? kthread (kernel/kthread.c:464) 
[ 20.925472][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.925475][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 20.925478][ C1] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 20.925481][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 20.925487][ C1] __put_net (net/core/net_namespace.c:732) 
[ 20.925490][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 20.925494][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.925496][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.925501][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 20.925504][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.925507][ C1] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 20.925510][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 20.925514][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 20.925518][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 20.925522][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 20.925526][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 20.925529][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.925532][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 20.925536][ C1] kthread (kernel/kthread.c:464) 
[ 20.925539][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.925541][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 20.925544][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 20.925547][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.925550][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.925553][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.925555][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.925558][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   20.935837][    C1] RCU nest depth: 0, expected: 0
| [   20.935996][    C1] INFO: lockdep is turned off.
| [   20.936150][    C1] Preemption disabled at:
| [ 20.936152][ C1] handle_softirqs (kernel/softirq.c:553) 
[   20.936478][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.936480][    C1] Call Trace:
[   20.936481][    C1]  <TASK>
[ 20.936483][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.936489][ C1] __might_resched (kernel/sched/core.c:8796) 
[ 20.936495][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 20.936498][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 20.936501][ C1] ? simple_recursive_removal (fs/libfs.c:614) 
[ 20.936505][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.936508][ C1] ? 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) 
[ 20.936514][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 20.936516][ C1] ? 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) 
[ 20.936520][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 20.936524][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 20.936527][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 20.936532][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 20.936535][ C1] ? __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) 
[ 20.936539][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.936542][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 20.936545][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.936549][ C1] ? kthread (kernel/kthread.c:464) 
[ 20.936551][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.936554][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 20.936558][ C1] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 20.936561][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 20.936567][ C1] __put_net (net/core/net_namespace.c:732) 
[ 20.936570][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 20.936574][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.936576][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.936581][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 20.936584][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.936587][ C1] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 20.936590][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 20.936594][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 20.936598][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 20.936602][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 20.936605][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 20.936608][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.936612][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 20.936616][ C1] kthread (kernel/kthread.c:464) 
[ 20.936618][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.936620][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 20.936623][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 20.936626][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.936629][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.936632][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.936635][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.936637][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   26.213134][    C2] INFO: lockdep is turned off.
| [   26.213328][    C2] Preemption disabled at:
| [ 26.213330][ C2] 0x0 
| [   26.213703][    C2] Tainted: [W]=WARN
[   26.213705][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   26.213708][    C2] Call Trace:
[   26.213710][    C2]  <IRQ>
[ 26.213713][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 26.213725][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 26.213735][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 26.213741][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 26.213744][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 26.213749][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 26.213755][ 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) 
[ 26.213763][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 26.213766][ 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) 
[ 26.213769][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 26.213776][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 26.213779][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 26.213787][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 26.213790][ 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) 
[ 26.213798][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 26.213802][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 26.213805][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 26.213812][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 26.213818][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 26.213823][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 26.213827][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 26.213830][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 26.213833][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 26.213837][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 26.213839][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 26.213842][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 26.213847][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 26.213854][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 26.213859][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 26.213863][ C2] __put_net (net/core/net_namespace.c:732) 
[ 26.213868][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 26.213872][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 26.213875][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 26.213880][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 26.213884][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 26.213891][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 26.213898][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 26.213903][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 26.213908][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 26.213911][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 26.213914][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   26.213918][    C2]  </IRQ>
[   26.213919][    C2]  <TASK>
[ 26.213921][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 26.213923][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 26.213928][ C2] 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
[   26.213931][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   26.213935][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffffb31905d9
[   26.213937][    C2] RDX: ffffed1005ee66fb RSI: ffffffffb3453b60 RDI: ffffffffb098d18f
[   26.213939][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1005ee66fa
[   26.213940][    C2] R10: ffff88802f7337d3 R11: ffff888001ee2818 R12: 0000000000000000
[   26.213942][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 26.213946][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 26.213949][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 26.213953][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 26.213956][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 26.213959][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 26.213962][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 26.213966][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 26.213970][ C2] do_idle (kernel/sched/idle.c:325) 
[ 26.213974][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 26.213977][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 26.213980][ 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