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Subject: Re: [PATCH BUGFIX] block, bfq: postpone rq preparation to insert or
 merge
From:   Paolo Valente <paolo.valente@linaro.org>
In-Reply-To: <1525508378.5406.6.camel@gmx.de>
Date:   Sat, 5 May 2018 12:39:44 +0200
Cc:     Jens Axboe <axboe@kernel.dk>,
        linux-block <linux-block@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Mark Brown <broonie@kernel.org>, linus.walleij@linaro.org,
        bfq-iosched@googlegroups.com, oleksandr@natalenko.name
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Message-Id: <9F155F9F-F6B2-465A-BA4D-A86FF6825071@linaro.org>
References: <20180504171701.6876-1-paolo.valente@linaro.org>
 <1525463210.622.1.camel@gmx.de> <1525508378.5406.6.camel@gmx.de>
To:     Mike Galbraith <efault@gmx.de>
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> Il giorno 05 mag 2018, alle ore 10:19, Mike Galbraith <efault@gmx.de> =
ha scritto:
>=20
> On Fri, 2018-05-04 at 21:46 +0200, Mike Galbraith wrote:
>> Tentatively, I suspect you've just fixed the nasty stalls I reported =
a
>> while back.
>=20
> Oh well, so much for optimism.  It took a lot, but just hung.

Yep, it'd have been a lot of luck, being your hang related to
different operations from those touched by this fix.  Maybe
time-before-failure stretched because your system suffered from the
illness cured by this fix too.

BTW, if you didn't run out of patience with this permanent issue yet,
I was thinking of two o three changes to retry to trigger your failure
reliably.  In case of success, I could restart racking my brains from
there.

Thanks,
Paolo=