======================================
| [   18.560201][    C2] 1 lock held by ksoftirqd/2/27:
| [ 18.560398][ C2] #0: ffffffff9cb749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   18.560747][    C2]
| [   18.560747][    C2] stack backtrace:
[   18.560999][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.561001][    C2] Call Trace:
[   18.561003][    C2]  <TASK>
[ 18.561006][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.561013][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 18.561019][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 18.561026][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 18.561035][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 18.561040][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 18.561044][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 18.561048][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 18.561053][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 18.561056][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 18.561060][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.561066][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 18.561068][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 18.561074][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 18.561080][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 18.561082][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 18.561085][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 18.561089][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 18.561094][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 18.561097][ 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) 
[ 18.561103][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 18.561106][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 18.561109][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 18.561114][ C2] ? kthread (kernel/kthread.c:464) 
[ 18.561119][ C2] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 18.561124][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 18.561128][ C2] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2417) 
[ 18.561133][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 18.561139][ C2] __put_net (net/core/net_namespace.c:732) 
[ 18.561143][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 18.561147][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 18.561150][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 18.561155][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 18.561161][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.561166][ C2] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 18.561170][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 18.561177][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 18.561181][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 18.561185][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 18.561188][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 18.561191][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 18.561194][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 18.561198][ C2] kthread (kernel/kthread.c:464) 
[ 18.561201][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.561204][ C2] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 18.561207][ C2] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 18.561212][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.561217][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.561220][ C2] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 18.561223][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.561226][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   18.573535][    C2] RCU nest depth: 0, expected: 0
| [   18.573761][    C2] INFO: lockdep is turned off.
| [   18.573963][    C2] Preemption disabled at:
| [ 18.573966][ C2] handle_softirqs (kernel/softirq.c:553) 
[   18.574411][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.574413][    C2] Call Trace:
[   18.574415][    C2]  <TASK>
[ 18.574418][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.574427][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 18.574433][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 18.574437][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 18.574441][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 18.574445][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.574452][ 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) 
[ 18.574459][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 18.574463][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 18.574468][ 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) 
[ 18.574473][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 18.574476][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 18.574481][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 18.574484][ 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) 
[ 18.574489][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 18.574494][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 18.574497][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 18.574500][ C2] ? kthread (kernel/kthread.c:464) 
[ 18.574504][ C2] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 18.574508][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 18.574512][ C2] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2417) 
[ 18.574517][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 18.574523][ C2] __put_net (net/core/net_namespace.c:732) 
[ 18.574527][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 18.574531][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 18.574534][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 18.574540][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 18.574544][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.574547][ C2] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 18.574551][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 18.574557][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 18.574561][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 18.574564][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 18.574567][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 18.574570][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 18.574573][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 18.574577][ C2] kthread (kernel/kthread.c:464) 
[ 18.574580][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.574583][ C2] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 18.574585][ C2] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 18.574588][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.574592][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.574596][ C2] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 18.574598][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.574601][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   21.440208][    C0] INFO: lockdep is turned off.
| [   21.440413][    C0] Preemption disabled at:
| [ 21.440414][ C0] schedule_preempt_disabled (kernel/sched/core.c:6919) 
| [   21.440904][    C0] Tainted: [W]=WARN
[   21.440905][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   21.440907][    C0] Call Trace:
[   21.440909][    C0]  <IRQ>
[ 21.440910][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 21.440917][ C0] __might_resched (kernel/sched/core.c:8819) 
[ 21.440923][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 21.440927][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 21.440930][ C0] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 21.440935][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 21.440941][ 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) 
[ 21.440946][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 21.440949][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 21.440953][ 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) 
[ 21.440958][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 21.440961][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 21.440966][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 21.440969][ 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) 
[ 21.440975][ C0] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 21.440979][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 21.440982][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 21.440985][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 21.440990][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 21.440994][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 21.440997][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 21.441000][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 21.441002][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 21.441007][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 21.441010][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 21.441013][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 21.441016][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 21.441021][ C0] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 21.441027][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 21.441032][ C0] __put_net (net/core/net_namespace.c:732) 
[ 21.441035][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 21.441039][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 21.441042][ C0] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 21.441047][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 21.441051][ C0] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 21.441057][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 21.441063][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 21.441067][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 21.441072][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 21.441074][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 21.441077][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   21.441080][    C0]  </IRQ>
[   21.441081][    C0]  <TASK>
[ 21.441083][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 21.441086][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 21.441090][ C0] 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
[   21.441092][    C0] RSP: 0018:ffffffff9c807df8 EFLAGS: 00000246
[   21.441096][    C0] RAX: 0000000000000000 RBX: 1ffffffff3900fc3 RCX: ffffffff9bb5ba19
[   21.441098][    C0] RDX: ffffed1006c0667b RSI: ffffffff9be511e0 RDI: ffffffff9938633f
[   21.441100][    C0] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c0667a
[   21.441102][    C0] R10: ffff8880360333d3 R11: ffff888001becb58 R12: 0000000000000000
[   21.441104][    C0] R13: ffffffff9c81f240 R14: dffffc0000000000 R15: 0000000000014770
[ 21.441108][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 21.441111][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 21.441116][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 21.441119][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 21.441121][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 21.441125][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 21.441129][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 21.441136][ C0] do_idle (kernel/sched/idle.c:325) 
[ 21.441140][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 21.441144][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 21.441147][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 21.441151][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:501) 
[ 21.441155][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:443 (discriminator 17)) 


Finger prints:
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock
handle_softirqs:dump_stack_lvl:__might_resched:down_write:simple_recursive_removal
schedule_preempt_disabled:dump_stack_lvl:__might_resched:down_write:simple_recursive_removal