Re: [PATCH BUGFIX] block, bfq: deschedule empty bfq_queues not referred by any process

[Oleksandr Natalenko <oleksandr@xxxxxxxxxxxxxx>]

Hi.

On 13.11.2019 18:42, Paolo Valente wrote:
> > Il giorno 13 nov 2019, alle ore 16:01, Oleksandr Natalenko 
> > <oleksandr@xxxxxxxxxxxxxx> ha scritto:
> Ok, you may have given me enough information, thank you very much.
>
> Could you please apply the attached (compressed) patch on top of my
> offending patch?  For review purposes, here is the simple change:
>
> --- a/block/bfq-iosched.c
> +++ b/block/bfq-iosched.c
> @@ -2728,7 +2728,8 @@ void bfq_release_process_ref(struct bfq_data
> *bfqd, struct bfq_queue *bfqq)
>          * freed when dequeued from service. But this is assumed to
>          * never happen.
>          */
> -       if (bfq_bfqq_busy(bfqq) && RB_EMPTY_ROOT(&bfqq->sort_list))
> +       if (bfq_bfqq_busy(bfqq) && RB_EMPTY_ROOT(&bfqq->sort_list) &&
> +           bfqq != bfqd->in_service_queue)
>                 bfq_del_bfqq_busy(bfqd, bfqq, false);
>
>         bfq_put_queue(bfqq);

The issue is not reproducible for me after applying this patch.

Thank you.

--
  Oleksandr Natalenko (post-factum)