linux-kernel - Re: Regression in 5.17-rc1 on pata-falcon (was: Re: [PATCH] m68k: mm: Remove check for VM

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Message-ID: <CAMuHMdVnkvSCHKt5ouZP7HrMBg7nPg7fjiio-KVJ7dehA=FwyQ@mail.gmail.com>
Date:   Sat, 5 Feb 2022 09:31:52 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Michael Schmitz <schmitzmic@...il.com>
Cc:     linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Jens Axboe <axboe@...nel.dk>,
        Laibin Qiu <qiulaibin@...wei.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>
Subject: Re: Regression in 5.17-rc1 on pata-falcon (was: Re: [PATCH] m68k: mm:
 Remove check for VM_IO to fix deferred I/O)

Hi Michael,

On Sat, Feb 5, 2022 at 1:04 AM Michael Schmitz <schmitzmic@...il.com> wrote:
> commit 180dccb0dba4f5e84a4a70c1be1d34cbb6528b32 (blk-mq: fix tag_get
> wait task can't be awakened) does cause a regression on my m68k hardware
> test rig (m68k Falcon030, IDE disk attached through pata-falcon driver
> which does use polled IO instead of interrupts, so may be a little on
> the slow side).

> Bisection between v5.16 and v5.17-rc1 points to
> 180dccb0dba4f5e84a4a70c1be1d34cbb6528b32 as the culprit, which is
> corroborated by reverting that commit in v5.17-rc1 and booting as
> rapidly as before.

Now you know the culprit, it looks like several other people ran into this.
Does this fix help?
https://lore.kernel.org/all/1643040870.3bwvk3sis4.none@localhost/

It is commit 10825410b956dc1e ("blk-mq: Fix wrong wakeup
batch configuration which will cause hang") in v5.17-rc2.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds