======================================
| [   15.622090][    C1] 1 lock held by ksoftirqd/1/22:
| [ 15.622272][ C1] #0: ffffffff98b774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   15.622593][    C1]
| [   15.622593][    C1] stack backtrace:
[   15.622821][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.622823][    C1] Call Trace:
[   15.622825][    C1]  <TASK>
[ 15.622827][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.622833][ C1] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 15.622837][ C1] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 15.622841][ C1] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.622845][ C1] ? save_trace (kernel/locking/lockdep.c:595) 
[ 15.622850][ C1] mark_lock (kernel/locking/lockdep.c:4756) 
[ 15.622854][ C1] mark_usage (kernel/locking/lockdep.c:4645) 
[ 15.622857][ C1] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 15.622859][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 15.622863][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 15.622866][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.622870][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.622874][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 15.622876][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.622881][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.622884][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.622887][ C1] simple_pin_fs (fs/libfs.c:1067) 
[ 15.622891][ C1] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.622894][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 15.622899][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.622903][ 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) 
[ 15.622908][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.622911][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.622914][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.622918][ C1] ? kthread (kernel/kthread.c:464) 
[ 15.622921][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.622924][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.622926][ 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) 
[ 15.622930][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 15.622935][ C1] __put_net (net/core/net_namespace.c:732) 
[ 15.622939][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.622943][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.622945][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.622949][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.622952][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.622955][ C1] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 15.622958][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.622962][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.622966][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 15.622970][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.622973][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.622976][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.622980][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.622983][ C1] kthread (kernel/kthread.c:464) 
[ 15.622986][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.622988][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 15.622990][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 15.622993][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.622996][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.622999][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.623001][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.623003][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   15.633196][    C1] RCU nest depth: 0, expected: 0
| [   15.633345][    C1] INFO: lockdep is turned off.
| [   15.633500][    C1] Preemption disabled at:
| [ 15.633502][ C1] handle_softirqs (kernel/softirq.c:553) 
[   15.633807][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.633809][    C1] Call Trace:
[   15.633810][    C1]  <TASK>
[ 15.633812][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.633818][ C1] __might_resched (kernel/sched/core.c:8796) 
[ 15.633824][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.633828][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.633830][ C1] ? simple_recursive_removal (fs/libfs.c:614) 
[ 15.633834][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.633838][ 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) 
[ 15.633843][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 15.633846][ 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) 
[ 15.633848][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.633854][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.633856][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 15.633861][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.633864][ 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) 
[ 15.633869][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.633871][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.633874][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.633878][ C1] ? kthread (kernel/kthread.c:464) 
[ 15.633895][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.633898][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.633902][ 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) 
[ 15.633905][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 15.633910][ C1] __put_net (net/core/net_namespace.c:732) 
[ 15.633913][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.633917][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.633920][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.633924][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.633927][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.633930][ C1] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 15.633932][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.633936][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.633940][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 15.633944][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.633947][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.633950][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.633953][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.633957][ C1] kthread (kernel/kthread.c:464) 
[ 15.633959][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.633961][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 15.633963][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 15.633967][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.633970][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.633973][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.633975][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.633977][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   17.602224][    C3] INFO: lockdep is turned off.
| [   17.602432][    C3] Preemption disabled at:
| [ 17.602434][ C3] 0x0 
| [   17.602903][    C3] Tainted: [W]=WARN
[   17.602905][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.602907][    C3] Call Trace:
[   17.602910][    C3]  <IRQ>
[ 17.602912][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.602923][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 17.602932][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.602937][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.602941][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 17.602946][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 17.602952][ 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) 
[ 17.602960][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 17.602963][ 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) 
[ 17.602966][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.602973][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.602976][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 17.602983][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.602987][ 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) 
[ 17.602994][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 17.602998][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.603001][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.603008][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 17.603015][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.603019][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 17.603023][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 17.603026][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.603028][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.603033][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 17.603036][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.603038][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.603043][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 17.603050][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 17.603056][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 17.603060][ C3] __put_net (net/core/net_namespace.c:732) 
[ 17.603065][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 17.603069][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 17.603071][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 17.603075][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 17.603079][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 17.603087][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.603094][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 17.603100][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 17.603105][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.603108][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.603111][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   17.603115][    C3]  </IRQ>
[   17.603116][    C3]  <TASK>
[ 17.603118][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.603120][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 17.603125][ C3] 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
[   17.603128][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   17.603132][    C3] RAX: 0000000000000003 RBX: 1ffff9200002afc1 RCX: ffffffff97b8f5d9
[   17.603134][    C3] RDX: ffffed1006c366fb RSI: ffffffff97e53b60 RDI: ffffffff9538d18f
[   17.603136][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c366fa
[   17.603137][    C3] R10: ffff8880361b37d3 R11: ffff88800adf2818 R12: 0000000000000000
[   17.603139][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 17.603143][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.603146][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.603150][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 17.603152][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.603155][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.603158][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.603162][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 17.603166][ C3] do_idle (kernel/sched/idle.c:325) 
[ 17.603169][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.603172][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.603175][ 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