======================================
| [   16.699340][    C1] 1 lock held by ksoftirqd/1/22:
| [ 16.699519][ C1] #0: ffffffffa77749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   16.699836][    C1]
| [   16.699836][    C1] stack backtrace:
[   16.700066][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.700068][    C1] Call Trace:
[   16.700071][    C1]  <TASK>
[ 16.700073][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.700080][ C1] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 16.700085][ C1] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 16.700091][ C1] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 16.700098][ C1] ? save_trace (kernel/locking/lockdep.c:594) 
[ 16.700102][ C1] mark_lock (kernel/locking/lockdep.c:4754) 
[ 16.700107][ C1] mark_usage (kernel/locking/lockdep.c:4643) 
[ 16.700111][ C1] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 16.700116][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 16.700119][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 16.700122][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.700129][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 16.700131][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 16.700134][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 16.700137][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 16.700140][ C1] simple_pin_fs (fs/libfs.c:1066) 
[ 16.700143][ C1] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 16.700146][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.700152][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.700155][ 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) 
[ 16.700163][ C1] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 16.700166][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.700169][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.700173][ C1] ? kthread (kernel/kthread.c:464) 
[ 16.700179][ C1] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 16.700181][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 16.700184][ 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) 
[ 16.700189][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 16.700194][ C1] __put_net (net/core/net_namespace.c:732) 
[ 16.700198][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 16.700202][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.700205][ C1] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 16.700211][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.700214][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.700218][ C1] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 16.700223][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 16.700230][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.700234][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 16.700237][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 16.700240][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 16.700243][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.700246][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 16.700250][ C1] kthread (kernel/kthread.c:464) 
[ 16.700254][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.700256][ C1] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 16.700258][ C1] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 16.700261][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.700265][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.700269][ C1] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 16.700271][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.700274][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   16.711000][    C1] RCU nest depth: 0, expected: 0
| [   16.711167][    C1] INFO: lockdep is turned off.
| [   16.711347][    C1] Preemption disabled at:
| [ 16.711349][ C1] handle_softirqs (kernel/softirq.c:553) 
[   16.711696][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.711698][    C1] Call Trace:
[   16.711700][    C1]  <TASK>
[ 16.711703][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.711711][ C1] __might_resched (kernel/sched/core.c:8819) 
[ 16.711718][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.711723][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.711727][ C1] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 16.711732][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.711739][ 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) 
[ 16.711745][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 16.711747][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.711752][ 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) 
[ 16.711756][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.711759][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.711765][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.711768][ 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) 
[ 16.711774][ C1] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 16.711779][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.711782][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.711786][ C1] ? kthread (kernel/kthread.c:464) 
[ 16.711790][ C1] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 16.711794][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 16.711800][ 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) 
[ 16.711805][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 16.711811][ C1] __put_net (net/core/net_namespace.c:732) 
[ 16.711815][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 16.711820][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.711823][ C1] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 16.711828][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.711832][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.711835][ C1] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 16.711840][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 16.711846][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.711850][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 16.711854][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 16.711857][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 16.711860][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.711863][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 16.711867][ C1] kthread (kernel/kthread.c:464) 
[ 16.711870][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.711873][ C1] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 16.711875][ C1] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 16.711878][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.711882][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.711886][ C1] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 16.711888][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.711891][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   18.501714][    C2] INFO: lockdep is turned off.
| [   18.501903][    C2] Preemption disabled at:
| [ 18.501905][ C2] 0x0 
| [   18.502267][    C2] Tainted: [W]=WARN
[   18.502268][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.502271][    C2] Call Trace:
[   18.502273][    C2]  <IRQ>
[ 18.502276][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.502291][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 18.502303][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 18.502309][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 18.502313][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 18.502320][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.502330][ 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) 
[ 18.502337][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 18.502340][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 18.502348][ 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) 
[ 18.502353][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 18.502356][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 18.502365][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 18.502368][ 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) 
[ 18.502376][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 18.502382][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 18.502385][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 18.502392][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 18.502399][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.502405][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 18.502409][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 18.502411][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 18.502414][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.502421][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 18.502424][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 18.502428][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 18.502436][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 18.502442][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 18.502450][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.502455][ C2] __put_net (net/core/net_namespace.c:732) 
[ 18.502460][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 18.502464][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 18.502467][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 18.502472][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 18.502477][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 18.502484][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 18.502491][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 18.502497][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 18.502502][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 18.502504][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 18.502507][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   18.502510][    C2]  </IRQ>
[   18.502512][    C2]  <TASK>
[ 18.502513][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.502516][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 18.502521][ 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
[   18.502524][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   18.502530][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffffa675ba19
[   18.502532][    C2] RDX: ffffed1005ea667b RSI: ffffffffa6a511e0 RDI: ffffffffa3f8633f
[   18.502534][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1005ea667a
[   18.502536][    C2] R10: ffff88802f5333d3 R11: ffff888001eda858 R12: 0000000000000000
[   18.502537][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 18.502542][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 18.502545][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.502550][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 18.502553][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 18.502556][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.502560][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 18.502565][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 18.502570][ C2] do_idle (kernel/sched/idle.c:325) 
[ 18.502574][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 18.502578][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 18.502581][ 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