======================================
| [   16.358685][    C1] 1 lock held by ksoftirqd/1/22:
| [ 16.358879][ C1] #0: ffffffffb19774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   16.359243][    C1]
| [   16.359243][    C1] stack backtrace:
[   16.359495][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.359497][    C1] Call Trace:
[   16.359498][    C1]  <TASK>
[ 16.359501][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.359506][ C1] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 16.359511][ C1] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 16.359516][ C1] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 16.359520][ C1] ? save_trace (kernel/locking/lockdep.c:595) 
[ 16.359526][ C1] mark_lock (kernel/locking/lockdep.c:4756) 
[ 16.359530][ C1] mark_usage (kernel/locking/lockdep.c:4645) 
[ 16.359532][ C1] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 16.359536][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 16.359540][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 16.359543][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 16.359547][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.359552][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 16.359554][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 16.359559][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 16.359562][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 16.359565][ C1] simple_pin_fs (fs/libfs.c:1067) 
[ 16.359569][ C1] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 16.359573][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 16.359578][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 16.359582][ 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) 
[ 16.359587][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.359590][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 16.359593][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.359597][ C1] ? kthread (kernel/kthread.c:464) 
[ 16.359600][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 16.359603][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 16.359606][ 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) 
[ 16.359609][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 16.359615][ C1] __put_net (net/core/net_namespace.c:732) 
[ 16.359618][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.359622][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.359624][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.359629][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.359632][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.359635][ C1] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 16.359638][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 16.359642][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.359646][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 16.359650][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 16.359654][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 16.359656][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.359660][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 16.359664][ C1] kthread (kernel/kthread.c:464) 
[ 16.359667][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.359669][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 16.359671][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 16.359675][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.359678][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.359680][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 16.359683][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.359685][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   16.371679][    C1] RCU nest depth: 0, expected: 0
| [   16.371851][    C1] INFO: lockdep is turned off.
| [   16.372040][    C1] Preemption disabled at:
| [ 16.372042][ C1] handle_softirqs (kernel/softirq.c:553) 
[   16.372405][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.372407][    C1] Call Trace:
[   16.372408][    C1]  <TASK>
[ 16.372410][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.372416][ C1] __might_resched (kernel/sched/core.c:8796) 
[ 16.372423][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.372427][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.372430][ C1] ? simple_recursive_removal (fs/libfs.c:614) 
[ 16.372433][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.372437][ 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) 
[ 16.372443][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 16.372445][ 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) 
[ 16.372449][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.372454][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.372457][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 16.372463][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 16.372466][ 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) 
[ 16.372471][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.372474][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 16.372477][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.372481][ C1] ? kthread (kernel/kthread.c:464) 
[ 16.372483][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 16.372487][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 16.372491][ 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) 
[ 16.372495][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 16.372500][ C1] __put_net (net/core/net_namespace.c:732) 
[ 16.372504][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.372508][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.372510][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.372515][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.372518][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.372521][ C1] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 16.372524][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 16.372528][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.372532][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 16.372536][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 16.372540][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 16.372542][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.372546][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 16.372550][ C1] kthread (kernel/kthread.c:464) 
[ 16.372553][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.372555][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 16.372558][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 16.372561][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.372564][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.372567][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 16.372570][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.372572][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   18.713498][    C2] INFO: lockdep is turned off.
| [   18.713828][    C2] Preemption disabled at:
| [ 18.713831][ C2] 0x0 
| [   18.714472][    C2] Tainted: [W]=WARN
[   18.714474][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.714478][    C2] Call Trace:
[   18.714481][    C2]  <IRQ>
[ 18.714485][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.714499][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 18.714512][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 18.714520][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 18.714525][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 18.714532][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.714541][ 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) 
[ 18.714550][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 18.714554][ 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) 
[ 18.714559][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 18.714569][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 18.714574][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 18.714584][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 18.714589][ 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) 
[ 18.714598][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.714604][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 18.714609][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 18.714618][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 18.714626][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.714633][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 18.714638][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 18.714642][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 18.714647][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.714653][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 18.714657][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 18.714662][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 18.714668][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 18.714677][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 18.714684][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.714691][ C2] __put_net (net/core/net_namespace.c:732) 
[ 18.714698][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 18.714705][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.714710][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.714719][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 18.714727][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.714736][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 18.714744][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 18.714754][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 18.714759][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 18.714764][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   18.714770][    C2]  </IRQ>
[   18.714772][    C2]  <TASK>
[ 18.714775][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.714780][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 18.714787][ 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
[   18.714792][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   18.714798][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffffb09905d9
[   18.714802][    C2] RDX: ffffed1006c266fb RSI: ffffffffb0c53b60 RDI: ffffffffae18d18f
[   18.714805][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c266fa
[   18.714808][    C2] R10: ffff8880361337d3 R11: ffff888001bdcad8 R12: 0000000000000000
[   18.714811][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 18.714819][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 18.714825][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.714832][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 18.714837][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 18.714842][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.714848][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 18.714855][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 18.714862][ C2] do_idle (kernel/sched/idle.c:325) 
[ 18.714869][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 18.714875][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 18.714880][ 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