======================================
| [   15.329350][    C0] 1 lock held by ksoftirqd/0/14:
| [ 15.329524][ C0] #0: ffffffffb4f774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   15.329826][    C0]
| [   15.329826][    C0] stack backtrace:
[   15.330042][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.330045][    C0] Call Trace:
[   15.330047][    C0]  <TASK>
[ 15.330049][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.330056][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 15.330061][ C0] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 15.330065][ C0] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.330070][ C0] ? save_trace (kernel/locking/lockdep.c:595) 
[ 15.330076][ C0] mark_lock (kernel/locking/lockdep.c:4756) 
[ 15.330079][ C0] mark_usage (kernel/locking/lockdep.c:4645) 
[ 15.330083][ C0] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 15.330086][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 15.330090][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 15.330093][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.330097][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.330102][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 15.330104][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.330109][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.330112][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.330116][ C0] simple_pin_fs (fs/libfs.c:1067) 
[ 15.330119][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.330123][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 15.330128][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.330132][ 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) 
[ 15.330137][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.330140][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.330143][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.330147][ C0] ? kthread (kernel/kthread.c:464) 
[ 15.330150][ C0] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.330153][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.330156][ 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) 
[ 15.330159][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 15.330165][ C0] __put_net (net/core/net_namespace.c:732) 
[ 15.330168][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.330172][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.330174][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.330179][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.330182][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.330185][ C0] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 15.330188][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.330192][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.330196][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 15.330200][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.330204][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.330206][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.330210][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.330214][ C0] kthread (kernel/kthread.c:464) 
[ 15.330217][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.330219][ C0] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 15.330221][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 15.330224][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.330228][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.330230][ C0] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.330233][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.330235][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   15.340951][    C0] RCU nest depth: 0, expected: 0
| [   15.341116][    C0] INFO: lockdep is turned off.
| [   15.341279][    C0] Preemption disabled at:
| [ 15.341281][ C0] handle_softirqs (kernel/softirq.c:553) 
[   15.341628][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.341630][    C0] Call Trace:
[   15.341631][    C0]  <TASK>
[ 15.341633][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.341639][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 15.341645][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.341649][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.341652][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 15.341656][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.341660][ 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) 
[ 15.341665][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 15.341668][ 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) 
[ 15.341671][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.341676][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.341679][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 15.341683][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.341687][ 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) 
[ 15.341691][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.341694][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.341697][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.341701][ C0] ? kthread (kernel/kthread.c:464) 
[ 15.341704][ C0] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.341707][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.341710][ 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) 
[ 15.341714][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 15.341719][ C0] __put_net (net/core/net_namespace.c:732) 
[ 15.341722][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.341726][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.341728][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.341733][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.341737][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.341740][ C0] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 15.341742][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.341747][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.341750][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 15.341754][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.341758][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.341761][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.341765][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.341769][ C0] kthread (kernel/kthread.c:464) 
[ 15.341771][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.341773][ C0] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 15.341776][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 15.341779][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.341782][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.341785][ C0] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.341788][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.341790][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   16.995405][    C3] INFO: lockdep is turned off.
| [   16.995608][    C3] Preemption disabled at:
| [ 16.995610][ C3] 0x0 
| [   16.995935][    C3] Tainted: [W]=WARN
[   16.995936][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.995939][    C3] Call Trace:
[   16.995940][    C3]  <IRQ>
[ 16.995943][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.995952][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 16.995959][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.995964][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.995966][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 16.995971][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.995976][ 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) 
[ 16.995982][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 16.995984][ 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) 
[ 16.995988][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.995993][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.995996][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 16.996002][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.996005][ 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) 
[ 16.996012][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.996015][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.996019][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.996024][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 16.996028][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.996032][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.996036][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.996038][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.996041][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.996045][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 16.996047][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.996050][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.996053][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.996058][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 16.996063][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.996067][ C3] __put_net (net/core/net_namespace.c:732) 
[ 16.996071][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.996075][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.996077][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.996082][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.996086][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.996092][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.996098][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.996103][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 16.996108][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.996111][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.996114][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   16.996118][    C3]  </IRQ>
[   16.996119][    C3]  <TASK>
[ 16.996120][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.996123][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.996128][ 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
[   16.996130][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   16.996134][    C3] RAX: 0000000000000003 RBX: 1ffff9200002afc1 RCX: ffffffffb3f8f5d9
[   16.996136][    C3] RDX: ffffed1006c366fb RSI: ffffffffb4253b60 RDI: ffffffffb178d18f
[   16.996138][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c366fa
[   16.996139][    C3] R10: ffff8880361b37d3 R11: ffffffffb792a648 R12: 0000000000000000
[   16.996141][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 16.996145][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.996148][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.996152][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.996154][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.996157][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.996160][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.996164][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 16.996168][ C3] do_idle (kernel/sched/idle.c:325) 
[ 16.996172][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.996175][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.996178][ 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