linux-kernel - Re: AIO/DIO lockup/crash

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Message-ID: <x49tzhjcsdw.fsf@segfault.boston.devel.redhat.com>
Date:	Wed, 30 Apr 2008 10:46:35 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-aio <linux-aio@...ck.org>,
	Zach Brown <zach.brown@...cle.com>,
	Clark Williams <williams@...hat.com>
Subject: Re: AIO/DIO lockup/crash

Peter Zijlstra <peterz@...radead.org> writes:

> On Mon, 2008-04-28 at 09:08 -0700, Andrew Morton wrote:
>
>> erk, that's dio->bio_lock, isn't it?
>
> Yep.
>
>> That lock is super-simple and hasn't changed in quite some time.  If there
>> has been major memory wreckage and we're simply grabbing at a "lock" in
>> random memory then I'd expect the bug to maninfest in different ways on
>> different runs?
>
> Looks like it.
>
>> I assume you have lots of runtime debugging options enabled.
>
> Not on this particular run. I'll start a -git run this evening with most
> of the debugging option enabled. It takes a few hours to reproduce, so I
> let it run over-night.

Peter, any update on this?

FWIW, I've been running the aio-dio-invalidate-failure test on a fedora
kernel (2.6.25-8.fc9.i686) for several days now without any problems.
However, I'm not sure I can reproduce the bugs at all.  I'll revert to a
2.6.24 kernel and try.

Cheers,

Jeff
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