======================================
| [   14.984217][    C3] 1 lock held by ksoftirqd/3/32:
| [ 14.984396][ C3] #0: ffffffffae374480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   14.984695][    C3]
| [   14.984695][    C3] stack backtrace:
[   14.984906][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.984908][    C3] Call Trace:
[   14.984910][    C3]  <TASK>
[ 14.984912][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.984918][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 14.984923][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 14.984928][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 14.984934][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 14.984938][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 14.984942][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 14.984945][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 14.984951][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 14.984954][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.984958][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.984964][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 14.984967][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.984971][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 14.984974][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.984977][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 14.984981][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 14.984984][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 14.984989][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.984992][ 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:2333) 
[ 14.984997][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.985000][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.985003][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.985006][ C3] ? kthread (kernel/kthread.c:464) 
[ 14.985009][ C3] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 14.985013][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 14.985016][ 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) 
[ 14.985020][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 14.985026][ C3] __put_net (net/core/net_namespace.c:732) 
[ 14.985029][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 14.985033][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.985036][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.985040][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 14.985044][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.985048][ C3] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 14.985051][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 14.985057][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 14.985061][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 14.985064][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 14.985067][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 14.985069][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.985072][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 14.985076][ C3] kthread (kernel/kthread.c:464) 
[ 14.985079][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.985082][ C3] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 14.985085][ C3] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 14.985089][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.985092][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.985095][ C3] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 14.985099][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.985102][ C3] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   14.994967][    C3] RCU nest depth: 0, expected: 0
| [   14.995126][    C3] INFO: lockdep is turned off.
| [   14.995281][    C3] Preemption disabled at:
| [ 14.995283][ C3] handle_softirqs (kernel/softirq.c:553) 
[   14.995596][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.995597][    C3] Call Trace:
[   14.995599][    C3]  <TASK>
[ 14.995600][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.995605][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 14.995610][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 14.995613][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 14.995616][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 14.995619][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.995624][ 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) 
[ 14.995629][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 14.995631][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 14.995634][ 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) 
[ 14.995638][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 14.995641][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 14.995645][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.995648][ 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:2333) 
[ 14.995652][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.995655][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.995658][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.995661][ C3] ? kthread (kernel/kthread.c:464) 
[ 14.995665][ C3] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 14.995669][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 14.995672][ 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) 
[ 14.995676][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 14.995681][ C3] __put_net (net/core/net_namespace.c:732) 
[ 14.995684][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 14.995688][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.995691][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.995696][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 14.995700][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.995703][ C3] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 14.995707][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 14.995712][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 14.995715][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 14.995718][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 14.995724][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 14.995726][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.995729][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 14.995732][ C3] kthread (kernel/kthread.c:464) 
[ 14.995736][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.995739][ C3] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 14.995742][ C3] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 14.995746][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.995749][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.995753][ C3] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 14.995756][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.995759][ C3] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   16.826183][    C2] INFO: lockdep is turned off.
| [   16.826375][    C2] Preemption disabled at:
| [ 16.826376][ C2] 0x0 
| [   16.826743][    C2] Tainted: [W]=WARN
[   16.826744][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.826747][    C2] Call Trace:
[   16.826749][    C2]  <IRQ>
[ 16.826751][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.826759][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 16.826765][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.826770][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.826772][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 16.826776][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.826782][ 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) 
[ 16.826787][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 16.826789][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.826794][ 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) 
[ 16.826798][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.826801][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.826805][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.826808][ 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:2333) 
[ 16.826814][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.826817][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.826820][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.826824][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 16.826828][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.826831][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.826834][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.826836][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.826839][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.826843][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 16.826846][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.826849][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.826854][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.826858][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 16.826862][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.826866][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.826869][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 16.826873][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.826876][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.826897][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.826901][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.826906][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.826911][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.826915][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.826920][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.826922][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.826924][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   16.826928][    C2]  </IRQ>
[   16.826929][    C2]  <TASK>
[ 16.826930][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.826933][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.826937][ C2] Code: b0 b8 00 c3 cc cc cc cc 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 a3 d0 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:	b0 b8                	mov    $0xb8,%al
   2:	00 c3                	add    %al,%bl
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   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 a3 d0 13 00 	verw   0x13d0a3(%rip)        # 0x13d0cb
  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
[   16.826940][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   16.826943][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffffad355a19
[   16.826945][    C2] RDX: ffffed1006c2667b RSI: ffffffffad650c60 RDI: ffffffffaab84d8f
[   16.826947][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c2667a
[   16.826949][    C2] R10: ffff8880361333d3 R11: ffffffffb0cc9fa0 R12: 0000000000000000
[   16.826951][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 16.826955][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.826959][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.826964][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.826966][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.826968][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.826972][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.826977][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 16.826981][ C2] do_idle (kernel/sched/idle.c:325) 
[ 16.826985][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.826989][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.826992][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 


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