======================================
| [   20.995853][    C0] 1 lock held by ksoftirqd/0/14:
| [ 20.996170][ C0] #0: ffffffffaa1749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   20.996731][    C0]
| [   20.996731][    C0] stack backtrace:
[   20.997134][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.997138][    C0] Call Trace:
[   20.997141][    C0]  <TASK>
[ 20.997146][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.997158][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 20.997169][ C0] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 20.997178][ C0] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 20.997188][ C0] ? save_trace (kernel/locking/lockdep.c:594) 
[ 20.997196][ C0] mark_lock (kernel/locking/lockdep.c:4754) 
[ 20.997203][ C0] mark_usage (kernel/locking/lockdep.c:4643) 
[ 20.997210][ C0] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 20.997220][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 20.997225][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 20.997233][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.997240][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 20.997244][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 20.997251][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 20.997257][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 20.997261][ C0] simple_pin_fs (fs/libfs.c:1066) 
[ 20.997266][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 20.997273][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 20.997281][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 20.997287][ 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:2366) 
[ 20.997295][ C0] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 20.997301][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 20.997306][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.997312][ C0] ? kthread (kernel/kthread.c:464) 
[ 20.997319][ C0] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 20.997323][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 20.997331][ C0] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2417) 
[ 20.997339][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 20.997351][ C0] __put_net (net/core/net_namespace.c:732) 
[ 20.997357][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 20.997364][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 20.997370][ C0] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 20.997380][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 20.997387][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.997392][ C0] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 20.997399][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 20.997410][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 20.997417][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 20.997425][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 20.997431][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 20.997436][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.997442][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 20.997449][ C0] kthread (kernel/kthread.c:464) 
[ 20.997454][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.997459][ C0] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 20.997462][ C0] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 20.997468][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.997474][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.997481][ C0] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 20.997485][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.997490][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   21.017059][    C0] RCU nest depth: 0, expected: 0
| [   21.017349][    C0] INFO: lockdep is turned off.
| [   21.017825][    C0] Preemption disabled at:
| [ 21.017828][ C0] handle_softirqs (kernel/softirq.c:553) 
[   21.018420][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   21.018423][    C0] Call Trace:
[   21.018426][    C0]  <TASK>
[ 21.018430][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 21.018442][ C0] __might_resched (kernel/sched/core.c:8819) 
[ 21.018453][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 21.018461][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 21.018467][ C0] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 21.018475][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 21.018484][ 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) 
[ 21.018492][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 21.018497][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 21.018505][ 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) 
[ 21.018514][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 21.018519][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 21.018528][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 21.018533][ 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:2366) 
[ 21.018541][ C0] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 21.018547][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 21.018552][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 21.018557][ C0] ? kthread (kernel/kthread.c:464) 
[ 21.018565][ C0] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 21.018570][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 21.018579][ C0] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2417) 
[ 21.018587][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 21.018599][ C0] __put_net (net/core/net_namespace.c:732) 
[ 21.018607][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 21.018614][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 21.018619][ C0] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 21.018628][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 21.018635][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 21.018641][ C0] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 21.018646][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 21.018657][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 21.018665][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 21.018673][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 21.018679][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 21.018683][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 21.018688][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 21.018695][ C0] kthread (kernel/kthread.c:464) 
[ 21.018701][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 21.018706][ C0] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 21.018710][ C0] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 21.018716][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 21.018722][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 21.018728][ C0] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 21.018733][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 21.018738][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   26.717378][    C3] INFO: lockdep is turned off.
| [   26.717722][    C3] Preemption disabled at:
| [ 26.717727][ C3] 0x0 
| [   26.718456][    C3] Tainted: [W]=WARN
[   26.718459][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   26.718462][    C3] Call Trace:
[   26.718466][    C3]  <IRQ>
[ 26.718469][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 26.718487][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 26.718501][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 26.718509][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 26.718515][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 26.718525][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 26.718538][ 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) 
[ 26.718548][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 26.718553][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 26.718560][ 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) 
[ 26.718570][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 26.718575][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 26.718584][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 26.718590][ 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:2366) 
[ 26.718602][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 26.718610][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 26.718614][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 26.718622][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 26.718630][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 26.718636][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 26.718640][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 26.718644][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 26.718646][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 26.718652][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 26.718656][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 26.718660][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 26.718666][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 26.718672][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 26.718678][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 26.718686][ C3] __put_net (net/core/net_namespace.c:732) 
[ 26.718693][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 26.718699][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 26.718704][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 26.718714][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 26.718720][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 26.718729][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 26.718739][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 26.718747][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 26.718757][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 26.718762][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 26.718766][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   26.718773][    C3]  </IRQ>
[   26.718775][    C3]  <TASK>
[ 26.718778][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 26.718784][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 26.718791][ C3] 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
[   26.718796][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   26.718803][    C3] RAX: 0000000000000003 RBX: 1ffff9200002afc1 RCX: ffffffffa915ba19
[   26.718807][    C3] RDX: ffffed1006c3667b RSI: ffffffffa94511e0 RDI: ffffffffa698633f
[   26.718810][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c3667a
[   26.718813][    C3] R10: ffff8880361b33d3 R11: ffff888009bbcb58 R12: 0000000000000000
[   26.718817][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 26.718825][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 26.718832][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 26.718840][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 26.718845][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 26.718850][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 26.718857][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 26.718865][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 26.718874][ C3] do_idle (kernel/sched/idle.c:325) 
[ 26.718882][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 26.718888][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 26.718895][ 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