linux-kernel - Re: [PATCH BUGFIX] block, bfq: postpone rq preparation to insert or merge

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Date:   Sat, 5 May 2018 12:39:44 +0200
From:   Paolo Valente <paolo.valente@...aro.org>
To:     Mike Galbraith <efault@....de>
Cc:     Jens Axboe <axboe@...nel.dk>,
        linux-block <linux-block@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Mark Brown <broonie@...nel.org>, linus.walleij@...aro.org,
        bfq-iosched@...glegroups.com, oleksandr@...alenko.name
Subject: Re: [PATCH BUGFIX] block, bfq: postpone rq preparation to insert or
 merge

> Il giorno 05 mag 2018, alle ore 10:19, Mike Galbraith <efault@....de> ha scritto:
> 
> 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.
> 
> 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