======================================
| [   17.837955][    C3] 1 lock held by ksoftirqd/3/32:
| [ 17.838154][ C3] #0: ffffffff9fb774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   17.838482][    C3]
| [   17.838482][    C3] stack backtrace:
[   17.838712][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.838714][    C3] Call Trace:
[   17.838716][    C3]  <TASK>
[ 17.838720][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.838727][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 17.838733][ C3] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 17.838738][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 17.838744][ C3] ? save_trace (kernel/locking/lockdep.c:595) 
[ 17.838750][ C3] mark_lock (kernel/locking/lockdep.c:4756) 
[ 17.838754][ C3] mark_usage (kernel/locking/lockdep.c:4645) 
[ 17.838757][ C3] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 17.838761][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 17.838765][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 17.838768][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 17.838774][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 17.838779][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 17.838781][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 17.838786][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 17.838789][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 17.838792][ C3] simple_pin_fs (fs/libfs.c:1067) 
[ 17.838796][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 17.838802][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 17.838812][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 17.838817][ 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) 
[ 17.838827][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 17.838831][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 17.838836][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 17.838843][ C3] ? kthread (kernel/kthread.c:464) 
[ 17.838848][ C3] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 17.838853][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 17.838858][ 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) 
[ 17.838865][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 17.838871][ C3] __put_net (net/core/net_namespace.c:732) 
[ 17.838876][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 17.838880][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 17.838883][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 17.838888][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 17.838892][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 17.838895][ C3] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 17.838899][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 17.838903][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 17.838908][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 17.838912][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 17.838916][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 17.838918][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 17.838922][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 17.838926][ C3] kthread (kernel/kthread.c:464) 
[ 17.838929][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.838931][ C3] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 17.838934][ C3] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 17.838937][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 17.838940][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.838943][ C3] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 17.838946][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.838948][ C3] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   17.849752][    C3] RCU nest depth: 0, expected: 0
| [   17.849930][    C3] INFO: lockdep is turned off.
| [   17.850093][    C3] Preemption disabled at:
| [ 17.850095][ C3] handle_softirqs (kernel/softirq.c:553) 
[   17.850434][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.850436][    C3] Call Trace:
[   17.850438][    C3]  <TASK>
[ 17.850440][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.850449][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 17.850457][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.850462][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.850465][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 17.850470][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 17.850475][ 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) 
[ 17.850482][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 17.850485][ 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) 
[ 17.850488][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.850494][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.850497][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 17.850504][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 17.850508][ 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) 
[ 17.850514][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 17.850517][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 17.850521][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 17.850524][ C3] ? kthread (kernel/kthread.c:464) 
[ 17.850527][ C3] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 17.850531][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 17.850536][ 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) 
[ 17.850540][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 17.850546][ C3] __put_net (net/core/net_namespace.c:732) 
[ 17.850550][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 17.850554][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 17.850557][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 17.850562][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 17.850565][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 17.850568][ C3] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 17.850572][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 17.850577][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 17.850581][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 17.850585][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 17.850588][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 17.850591][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 17.850595][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 17.850599][ C3] kthread (kernel/kthread.c:464) 
[ 17.850602][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.850604][ C3] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 17.850607][ C3] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 17.850610][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 17.850613][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.850617][ C3] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 17.850619][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.850622][ C3] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   20.793279][    C2] INFO: lockdep is turned off.
| [   20.793590][    C2] Preemption disabled at:
| [ 20.793592][ C2] 0x0 
| [   20.793996][    C2] Tainted: [W]=WARN
[   20.793998][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.794001][    C2] Call Trace:
[   20.794003][    C2]  <IRQ>
[ 20.794005][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.794017][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 20.794026][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 20.794031][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 20.794034][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 20.794040][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.794046][ 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) 
[ 20.794053][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 20.794056][ 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) 
[ 20.794059][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 20.794066][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 20.794069][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 20.794077][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 20.794081][ 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) 
[ 20.794088][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.794092][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 20.794095][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 20.794103][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 20.794109][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 20.794113][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 20.794117][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 20.794120][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 20.794123][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 20.794127][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 20.794129][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 20.794132][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 20.794137][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 20.794144][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 20.794149][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.794153][ C2] __put_net (net/core/net_namespace.c:732) 
[ 20.794158][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 20.794162][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.794165][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.794169][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 20.794173][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 20.794180][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 20.794187][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 20.794192][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 20.794198][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 20.794201][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 20.794204][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   20.794208][    C2]  </IRQ>
[   20.794209][    C2]  <TASK>
[ 20.794211][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 20.794213][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 20.794218][ 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
[   20.794221][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   20.794225][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffff9eb905d9
[   20.794227][    C2] RDX: ffffed1006c266fb RSI: ffffffff9ee53b60 RDI: ffffffff9c38d18f
[   20.794229][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c266fa
[   20.794231][    C2] R10: ffff8880361337d3 R11: ffffffffa2490298 R12: 0000000000000000
[   20.794232][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 20.794236][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 20.794240][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 20.794244][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 20.794246][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 20.794249][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 20.794252][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 20.794256][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 20.794261][ C2] do_idle (kernel/sched/idle.c:325) 
[ 20.794264][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 20.794267][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 20.794270][ 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