======================================
| [   19.091107][    C0] 1 lock held by ksoftirqd/0/14:
| [ 19.091388][ C0] #0: ffffffffb33774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   19.091794][    C0]
| [   19.091794][    C0] stack backtrace:
[   19.092157][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   19.092160][    C0] Call Trace:
[   19.092162][    C0]  <TASK>
[ 19.092166][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 19.092176][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 19.092184][ C0] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 19.092189][ C0] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 19.092195][ C0] ? save_trace (kernel/locking/lockdep.c:595) 
[ 19.092202][ C0] mark_lock (kernel/locking/lockdep.c:4756) 
[ 19.092206][ C0] mark_usage (kernel/locking/lockdep.c:4645) 
[ 19.092209][ C0] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 19.092213][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 19.092219][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 19.092223][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 19.092232][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 19.092238][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 19.092243][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 19.092251][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 19.092259][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 19.092264][ C0] simple_pin_fs (fs/libfs.c:1067) 
[ 19.092271][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 19.092279][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 19.092289][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 19.092293][ 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:2376) 
[ 19.092302][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 19.092306][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 19.092311][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 19.092317][ C0] ? kthread (kernel/kthread.c:464) 
[ 19.092322][ C0] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 19.092329][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 19.092336][ C0] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 19.092344][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 19.092354][ C0] __put_net (net/core/net_namespace.c:732) 
[ 19.092361][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 19.092368][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 19.092372][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 19.092378][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 19.092386][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 19.092390][ C0] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1059) 
[ 19.092399][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 19.092404][ C0] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 19.092409][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 19.092417][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 19.092425][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 19.092433][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 19.092441][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 19.092445][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 19.092451][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 19.092459][ C0] kthread (kernel/kthread.c:464) 
[ 19.092464][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.092468][ C0] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 19.092472][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 19.092478][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 19.092484][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.092488][ C0] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 19.092493][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.092498][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   19.111031][    C0] RCU nest depth: 0, expected: 0
| [   19.111289][    C0] INFO: lockdep is turned off.
| [   19.111549][    C0] Preemption disabled at:
| [ 19.111553][ C0] handle_softirqs (kernel/softirq.c:553) 
[   19.112114][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   19.112117][    C0] Call Trace:
[   19.112120][    C0]  <TASK>
[ 19.112125][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 19.112137][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 19.112149][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 19.112157][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 19.112162][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 19.112169][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 19.112179][ 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) 
[ 19.112188][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 19.112194][ 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) 
[ 19.112199][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 19.112209][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 19.112214][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 19.112222][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 19.112228][ 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:2376) 
[ 19.112236][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 19.112242][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 19.112247][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 19.112255][ C0] ? kthread (kernel/kthread.c:464) 
[ 19.112259][ C0] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 19.112266][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 19.112275][ C0] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 19.112281][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 19.112292][ C0] __put_net (net/core/net_namespace.c:732) 
[ 19.112298][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 19.112306][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 19.112310][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 19.112317][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 19.112324][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 19.112328][ C0] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1059) 
[ 19.112336][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 19.112341][ C0] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 19.112346][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 19.112353][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 19.112361][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 19.112369][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 19.112376][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 19.112381][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 19.112387][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 19.112394][ C0] kthread (kernel/kthread.c:464) 
[ 19.112398][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.112401][ C0] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 19.112405][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 19.112411][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 19.112417][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.112423][ C0] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 19.112428][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.112432][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   22.165739][    C3] INFO: lockdep is turned off.
| [   22.166028][    C3] Preemption disabled at:
| [ 22.166031][ C3] 0x0 
| [   22.166548][    C3] Tainted: [W]=WARN
[   22.166550][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   22.166554][    C3] Call Trace:
[   22.166557][    C3]  <IRQ>
[ 22.166561][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 22.166575][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 22.166589][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 22.166596][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 22.166602][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 22.166609][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 22.166618][ 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) 
[ 22.166627][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 22.166631][ 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) 
[ 22.166636][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 22.166646][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 22.166651][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 22.166661][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 22.166667][ 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) 
[ 22.166676][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 22.166682][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 22.166686][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 22.166692][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 22.166698][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 22.166703][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 22.166707][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 22.166711][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 22.166714][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 22.166720][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 22.166723][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 22.166726][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 22.166731][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 22.166740][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 22.166746][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 22.166754][ C3] __put_net (net/core/net_namespace.c:732) 
[ 22.166761][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 22.166768][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 22.166772][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 22.166781][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 22.166788][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 22.166799][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 22.166809][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 22.166817][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 22.166829][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 22.166835][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 22.166840][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   22.166846][    C3]  </IRQ>
[   22.166848][    C3]  <TASK>
[ 22.166851][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 22.166856][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 22.166863][ 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
[   22.166867][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   22.166874][    C3] RAX: 0000000000000003 RBX: 1ffff9200002afc1 RCX: ffffffffb23905d9
[   22.166877][    C3] RDX: ffffed1006c366fb RSI: ffffffffb2653b60 RDI: ffffffffafb8d18f
[   22.166880][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c366fa
[   22.166882][    C3] R10: ffff8880361b37d3 R11: ffff8880091a0558 R12: 0000000000000000
[   22.166885][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 22.166891][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 22.166896][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 22.166902][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 22.166906][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 22.166910][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 22.166914][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 22.166921][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 22.166929][ C3] do_idle (kernel/sched/idle.c:325) 
[ 22.166935][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 22.166940][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 22.166946][ 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