======================================
| [   17.195641][    C1] 1 lock held by ksoftirqd/1/22:
| [ 17.195826][ C1] #0: ffffffff93d749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   17.196151][    C1]
| [   17.196151][    C1] stack backtrace:
[   17.196378][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.196381][    C1] Call Trace:
[   17.196383][    C1]  <TASK>
[ 17.196386][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.196393][ C1] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 17.196399][ C1] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 17.196405][ C1] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 17.196411][ C1] ? save_trace (kernel/locking/lockdep.c:594) 
[ 17.196416][ C1] mark_lock (kernel/locking/lockdep.c:4754) 
[ 17.196421][ C1] mark_usage (kernel/locking/lockdep.c:4643) 
[ 17.196425][ C1] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 17.196430][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 17.196433][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.196437][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.196443][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 17.196445][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.196449][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 17.196452][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.196455][ C1] simple_pin_fs (fs/libfs.c:1066) 
[ 17.196458][ C1] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 17.196462][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.196468][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.196472][ 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:2366) 
[ 17.196479][ C1] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.196482][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.196485][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 17.196490][ C1] ? kthread (kernel/kthread.c:464) 
[ 17.196495][ C1] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 17.196497][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 17.196500][ C1] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2417) 
[ 17.196505][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 17.196511][ C1] __put_net (net/core/net_namespace.c:732) 
[ 17.196515][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 17.196518][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.196521][ C1] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.196526][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.196530][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.196534][ C1] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 17.196538][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 17.196545][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.196549][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 17.196552][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 17.196556][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 17.196558][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 17.196561][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 17.196565][ C1] kthread (kernel/kthread.c:464) 
[ 17.196569][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.196571][ C1] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 17.196573][ C1] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 17.196576][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.196580][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.196584][ C1] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 17.196586][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.196589][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   17.207279][    C1] RCU nest depth: 0, expected: 0
| [   17.207455][    C1] INFO: lockdep is turned off.
| [   17.207626][    C1] Preemption disabled at:
| [ 17.207628][ C1] handle_softirqs (kernel/softirq.c:553) 
[   17.207967][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.207969][    C1] Call Trace:
[   17.207972][    C1]  <TASK>
[ 17.207974][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.207982][ C1] __might_resched (kernel/sched/core.c:8819) 
[ 17.207990][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.207994][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.207998][ C1] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 17.208002][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.208009][ 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) 
[ 17.208014][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 17.208017][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.208022][ 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) 
[ 17.208027][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.208030][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.208036][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.208039][ 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:2366) 
[ 17.208046][ C1] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.208049][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.208052][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 17.208057][ C1] ? kthread (kernel/kthread.c:464) 
[ 17.208061][ C1] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 17.208064][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 17.208070][ C1] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2417) 
[ 17.208075][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 17.208081][ C1] __put_net (net/core/net_namespace.c:732) 
[ 17.208084][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 17.208088][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.208091][ C1] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.208096][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.208103][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.208108][ C1] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 17.208113][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 17.208119][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.208123][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 17.208126][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 17.208130][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 17.208132][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 17.208136][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 17.208140][ C1] kthread (kernel/kthread.c:464) 
[ 17.208143][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.208146][ C1] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 17.208148][ C1] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 17.208151][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.208155][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.208158][ C1] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 17.208163][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.208166][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   19.832544][    C2] INFO: lockdep is turned off.
| [   19.832755][    C2] Preemption disabled at:
| [ 19.832757][ C2] 0x0 
| [   19.833122][    C2] Tainted: [W]=WARN
[   19.833124][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   19.833126][    C2] Call Trace:
[   19.833129][    C2]  <IRQ>
[ 19.833131][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 19.833142][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 19.833151][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 19.833156][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 19.833162][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 19.833168][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 19.833176][ 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) 
[ 19.833182][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 19.833185][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 19.833191][ 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) 
[ 19.833196][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 19.833199][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 19.833206][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 19.833209][ 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:2366) 
[ 19.833216][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 19.833221][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 19.833224][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 19.833231][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 19.833236][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 19.833241][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 19.833244][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 19.833246][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 19.833249][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 19.833255][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 19.833258][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 19.833261][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 19.833267][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 19.833273][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 19.833278][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 19.833283][ C2] __put_net (net/core/net_namespace.c:732) 
[ 19.833287][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 19.833291][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 19.833294][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 19.833299][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 19.833304][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 19.833310][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 19.833317][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 19.833321][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 19.833326][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 19.833329][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 19.833331][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   19.833335][    C2]  </IRQ>
[   19.833336][    C2]  <TASK>
[ 19.833337][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 19.833340][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 19.833344][ C2] Code: 60 b8 00 e9 c3 57 02 00 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 c3 75 13 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	60                   	(bad)
   1:	b8 00 e9 c3 57       	mov    $0x57c3e900,%eax
   6:	02 00                	add    (%rax),%al
   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 c3 75 13 00 	verw   0x1375c3(%rip)        # 0x1375eb
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	cc                   	int3
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  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:	c3                   	ret
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   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
[   19.833347][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   19.833352][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffff92d5ba19
[   19.833354][    C2] RDX: ffffed1006c2667b RSI: ffffffff930511e0 RDI: ffffffff9058633f
[   19.833356][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c2667a
[   19.833358][    C2] R10: ffff8880361333d3 R11: ffffffff966b3438 R12: 0000000000000000
[   19.833360][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 19.833364][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 19.833368][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 19.833373][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 19.833375][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 19.833378][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 19.833382][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 19.833386][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 19.833392][ C2] do_idle (kernel/sched/idle.c:325) 
[ 19.833396][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 19.833400][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 19.833403][ 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