======================================
| [   15.923775][    C0] 1 lock held by ksoftirqd/0/14:
| [ 15.923948][ C0] #0: ffffffffb1d749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.924258][    C0]
| [   15.924258][    C0] stack backtrace:
[   15.924480][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.924482][    C0] Call Trace:
[   15.924484][    C0]  <TASK>
[ 15.924487][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.924493][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.924499][ C0] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.924504][ C0] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.924509][ C0] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.924514][ C0] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.924518][ C0] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.924521][ C0] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.924527][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.924530][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.924533][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.924538][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.924540][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.924544][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.924547][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.924550][ C0] simple_pin_fs (fs/libfs.c:1066) 
[ 15.924553][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.924556][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.924561][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.924564][ 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) 
[ 15.924569][ C0] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.924572][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.924575][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.924579][ C0] ? kthread (kernel/kthread.c:464) 
[ 15.924582][ C0] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 15.924585][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.924587][ 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) 
[ 15.924591][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 15.924598][ C0] __put_net (net/core/net_namespace.c:732) 
[ 15.924602][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.924605][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.924608][ C0] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.924614][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.924618][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.924621][ C0] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 15.924625][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.924631][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.924635][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 15.924639][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.924642][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.924644][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.924647][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.924651][ C0] kthread (kernel/kthread.c:464) 
[ 15.924655][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.924657][ C0] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 15.924659][ C0] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 15.924662][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.924666][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.924669][ C0] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 15.924671][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.924674][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   15.935151][    C0] RCU nest depth: 0, expected: 0
| [   15.935310][    C0] INFO: lockdep is turned off.
| [   15.935477][    C0] Preemption disabled at:
| [ 15.935479][ C0] handle_softirqs (kernel/softirq.c:553) 
[   15.935801][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.935802][    C0] Call Trace:
[   15.935804][    C0]  <TASK>
[ 15.935806][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.935812][ C0] __might_resched (kernel/sched/core.c:8819) 
[ 15.935818][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.935822][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.935825][ C0] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.935829][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.935834][ 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) 
[ 15.935838][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.935841][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.935845][ 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) 
[ 15.935849][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.935852][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.935856][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.935859][ 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) 
[ 15.935864][ C0] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.935868][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.935871][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.935875][ C0] ? kthread (kernel/kthread.c:464) 
[ 15.935878][ C0] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 15.935881][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.935885][ 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) 
[ 15.935890][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 15.935896][ C0] __put_net (net/core/net_namespace.c:732) 
[ 15.935899][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.935903][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.935906][ C0] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.935911][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.935915][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.935918][ C0] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 15.935922][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.935928][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.935931][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 15.935935][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.935938][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.935941][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.935944][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.935947][ C0] kthread (kernel/kthread.c:464) 
[ 15.935951][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.935954][ C0] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 15.935956][ C0] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 15.935958][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.935962][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.935966][ C0] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 15.935968][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.935971][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   18.176508][    C2] INFO: lockdep is turned off.
| [   18.176690][    C2] Preemption disabled at:
| [ 18.176692][ C2] 0x0 
| [   18.177058][    C2] Tainted: [W]=WARN
[   18.177059][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.177061][    C2] Call Trace:
[   18.177063][    C2]  <IRQ>
[ 18.177065][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.177074][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 18.177081][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 18.177085][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 18.177088][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 18.177093][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.177099][ 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) 
[ 18.177104][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 18.177107][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 18.177111][ 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) 
[ 18.177116][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 18.177119][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 18.177124][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 18.177127][ 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) 
[ 18.177133][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 18.177137][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 18.177140][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 18.177144][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 18.177149][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.177152][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 18.177156][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 18.177158][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 18.177160][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.177165][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 18.177168][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 18.177171][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 18.177176][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 18.177181][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 18.177185][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.177189][ C2] __put_net (net/core/net_namespace.c:732) 
[ 18.177193][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 18.177197][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 18.177200][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 18.177205][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 18.177209][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 18.177214][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 18.177220][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 18.177224][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 18.177228][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 18.177231][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 18.177233][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   18.177237][    C2]  </IRQ>
[   18.177238][    C2]  <TASK>
[ 18.177239][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.177242][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 18.177246][ 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
[   18.177249][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   18.177253][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffffb0d5ba19
[   18.177255][    C2] RDX: ffffed1006c2667b RSI: ffffffffb10511e0 RDI: ffffffffae58633f
[   18.177257][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c2667a
[   18.177258][    C2] R10: ffff8880361333d3 R11: ffff88800aab4b58 R12: 0000000000000000
[   18.177260][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 18.177264][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 18.177268][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.177272][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 18.177275][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 18.177277][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.177281][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 18.177285][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 18.177290][ C2] do_idle (kernel/sched/idle.c:325) 
[ 18.177294][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 18.177298][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 18.177301][ 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