======================================
| [   20.382091][    C1] 1 lock held by ksoftirqd/1/22:
| [ 20.382269][ C1] #0: ffffffff893774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   20.382584][    C1]
| [   20.382584][    C1] stack backtrace:
[   20.382812][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.382815][    C1] Call Trace:
[   20.382818][    C1]  <TASK>
[ 20.382823][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.382834][ C1] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 20.382841][ C1] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 20.382846][ C1] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 20.382852][ C1] ? save_trace (kernel/locking/lockdep.c:595) 
[ 20.382860][ C1] mark_lock (kernel/locking/lockdep.c:4756) 
[ 20.382864][ C1] mark_usage (kernel/locking/lockdep.c:4645) 
[ 20.382867][ C1] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 20.382870][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 20.382874][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 20.382877][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 20.382884][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.382889][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 20.382891][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 20.382896][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 20.382901][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 20.382905][ C1] simple_pin_fs (fs/libfs.c:1067) 
[ 20.382909][ C1] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 20.382915][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 20.382922][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 20.382926][ 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:2376) 
[ 20.382933][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.382936][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 20.382939][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.382944][ C1] ? kthread (kernel/kthread.c:464) 
[ 20.382947][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.382950][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 20.382955][ C1] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 20.382960][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 20.382966][ C1] __put_net (net/core/net_namespace.c:732) 
[ 20.382970][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 20.382975][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.382977][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.382982][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 20.382986][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.382989][ C1] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 20.382992][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 20.382997][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 20.383001][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 20.383007][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 20.383011][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 20.383014][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.383017][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 20.383021][ C1] kthread (kernel/kthread.c:464) 
[ 20.383024][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.383026][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 20.383029][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 20.383032][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.383035][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.383038][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.383041][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.383043][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   20.394253][    C1] RCU nest depth: 0, expected: 0
| [   20.394432][    C1] INFO: lockdep is turned off.
| [   20.394606][    C1] Preemption disabled at:
| [ 20.394608][ C1] handle_softirqs (kernel/softirq.c:553) 
[   20.394966][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.394969][    C1] Call Trace:
[   20.394971][    C1]  <TASK>
[ 20.394974][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.394984][ C1] __might_resched (kernel/sched/core.c:8796) 
[ 20.394992][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 20.394997][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 20.395001][ C1] ? simple_recursive_removal (fs/libfs.c:614) 
[ 20.395006][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.395012][ 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) 
[ 20.395020][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 20.395023][ 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) 
[ 20.395026][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 20.395032][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 20.395036][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 20.395043][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 20.395047][ 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:2376) 
[ 20.395053][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.395057][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 20.395060][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.395065][ C1] ? kthread (kernel/kthread.c:464) 
[ 20.395069][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.395074][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 20.395081][ C1] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 20.395086][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 20.395091][ C1] __put_net (net/core/net_namespace.c:732) 
[ 20.395096][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 20.395100][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.395102][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.395107][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 20.395110][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.395113][ C1] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 20.395117][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 20.395122][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 20.395126][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 20.395131][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 20.395135][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 20.395138][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.395142][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 20.395146][ C1] kthread (kernel/kthread.c:464) 
[ 20.395149][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.395151][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 20.395153][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 20.395157][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.395160][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.395163][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.395166][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.395168][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   25.387506][    C3] INFO: lockdep is turned off.
| [   25.387798][    C3] Preemption disabled at:
| [ 25.387802][ C3] 0x0 
| [   25.388349][    C3] Tainted: [W]=WARN
[   25.388351][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   25.388354][    C3] Call Trace:
[   25.388356][    C3]  <IRQ>
[ 25.388358][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 25.388370][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 25.388380][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 25.388385][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 25.388388][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 25.388394][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 25.388400][ 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) 
[ 25.388407][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 25.388410][ 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) 
[ 25.388414][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 25.388420][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 25.388423][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 25.388431][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 25.388435][ 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:2376) 
[ 25.388442][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 25.388446][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 25.388449][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 25.388455][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 25.388462][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 25.388467][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 25.388470][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 25.388473][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 25.388476][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.388480][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 25.388483][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 25.388485][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 25.388490][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 25.388497][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 25.388502][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 25.388507][ C3] __put_net (net/core/net_namespace.c:732) 
[ 25.388512][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 25.388516][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 25.388518][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 25.388523][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 25.388527][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 25.388534][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 25.388541][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 25.388546][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 25.388551][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 25.388555][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 25.388557][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   25.388561][    C3]  </IRQ>
[   25.388562][    C3]  <TASK>
[ 25.388564][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 25.388567][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 25.388571][ C3] Code: 92 b5 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 83 37 10 00 fb f4 <e9> fc 54 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	92                   	xchg   %eax,%edx
   1:	b5 00                	mov    $0x0,%ch
   3:	c3                   	ret
   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 83 37 10 00 	verw   0x103783(%rip)        # 0x1037ab
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	e9 fc 54 02 00       	jmp    0x2552b		<-- trapping instruction
  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:	e9 fc 54 02 00       	jmp    0x25501
   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
[   25.388574][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   25.388578][    C3] RAX: 0000000000000003 RBX: 1ffff9200002afc1 RCX: ffffffff883905d9
[   25.388580][    C3] RDX: ffffed1006c366fb RSI: ffffffff88653b60 RDI: ffffffff85b8d18f
[   25.388582][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c366fa
[   25.388584][    C3] R10: ffff8880361b37d3 R11: ffff888007ca4ad8 R12: 0000000000000000
[   25.388586][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 25.388590][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 25.388593][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.388597][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 25.388600][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 25.388602][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.388605][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 25.388609][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 25.388614][ C3] do_idle (kernel/sched/idle.c:325) 
[ 25.388618][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 25.388621][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 25.388624][ C3] ? __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