======================================
| [   15.113885][    C3] 1 lock held by ksoftirqd/3/32:
| [ 15.114059][ C3] #0: ffffffff88f749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.114371][    C3]
| [   15.114371][    C3] stack backtrace:
[   15.114590][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.114591][    C3] Call Trace:
[   15.114593][    C3]  <TASK>
[ 15.114595][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.114601][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.114606][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.114611][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.114616][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.114621][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.114625][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.114629][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.114634][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.114637][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.114640][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.114645][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.114647][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.114650][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.114653][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.114656][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 15.114659][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.114662][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.114667][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.114670][ 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) 
[ 15.114675][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.114678][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.114681][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.114685][ C3] ? kthread (kernel/kthread.c:464) 
[ 15.114689][ C3] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 15.114691][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.114694][ C3] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2417) 
[ 15.114698][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 15.114712][ C3] __put_net (net/core/net_namespace.c:732) 
[ 15.114716][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.114720][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.114723][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.114728][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.114732][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.114735][ C3] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 15.114739][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.114745][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.114749][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 15.114752][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.114756][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.114758][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.114762][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.114765][ C3] kthread (kernel/kthread.c:464) 
[ 15.114769][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.114771][ C3] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 15.114773][ C3] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 15.114776][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.114780][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.114784][ C3] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 15.114786][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.114789][ C3] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   15.125309][    C3] RCU nest depth: 0, expected: 0
| [   15.125473][    C3] INFO: lockdep is turned off.
| [   15.125637][    C3] Preemption disabled at:
| [ 15.125639][ C3] handle_softirqs (kernel/softirq.c:553) 
[   15.125982][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.125984][    C3] Call Trace:
[   15.125986][    C3]  <TASK>
[ 15.125988][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.125995][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 15.126001][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.126005][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.126008][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.126012][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.126018][ 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) 
[ 15.126022][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.126025][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.126029][ 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) 
[ 15.126034][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.126036][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.126041][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.126044][ 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) 
[ 15.126049][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.126053][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.126055][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.126059][ C3] ? kthread (kernel/kthread.c:464) 
[ 15.126063][ C3] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 15.126065][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.126070][ C3] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2417) 
[ 15.126074][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 15.126081][ C3] __put_net (net/core/net_namespace.c:732) 
[ 15.126084][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.126088][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.126091][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.126096][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.126100][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.126104][ C3] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 15.126108][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.126113][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.126117][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 15.126121][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.126124][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.126126][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.126130][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.126134][ C3] kthread (kernel/kthread.c:464) 
[ 15.126137][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.126140][ C3] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 15.126142][ C3] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 15.126145][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.126148][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.126152][ C3] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 15.126154][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.126157][ C3] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   16.780379][    C2] INFO: lockdep is turned off.
| [   16.780589][    C2] Preemption disabled at:
| [ 16.780591][ C2] 0x0 
| [   16.780975][    C2] Tainted: [W]=WARN
[   16.780977][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.780979][    C2] Call Trace:
[   16.780981][    C2]  <IRQ>
[ 16.780984][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.780994][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 16.781003][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.781008][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.781012][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 16.781018][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.781025][ 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) 
[ 16.781031][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 16.781034][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.781040][ 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) 
[ 16.781044][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.781047][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.781053][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.781056][ 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) 
[ 16.781063][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 16.781068][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.781071][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.781077][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 16.781083][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.781087][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.781091][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.781093][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.781096][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.781102][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 16.781105][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.781108][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.781114][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.781119][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 16.781124][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.781129][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.781133][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 16.781137][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.781140][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 16.781146][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.781150][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.781156][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.781163][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.781167][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.781172][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.781175][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.781177][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   16.781181][    C2]  </IRQ>
[   16.781182][    C2]  <TASK>
[ 16.781183][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.781186][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.781190][ 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
[   16.781193][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   16.781198][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffff87f5ba19
[   16.781200][    C2] RDX: ffffed1006c2667b RSI: ffffffff882511e0 RDI: ffffffff8578633f
[   16.781202][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c2667a
[   16.781204][    C2] R10: ffff8880361333d3 R11: ffff888001edcb58 R12: 0000000000000000
[   16.781206][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 16.781210][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.781214][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.781218][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.781221][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.781223][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.781227][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.781232][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 16.781237][ C2] do_idle (kernel/sched/idle.c:325) 
[ 16.781241][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.781245][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.781248][ 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