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Message-ID: <462F2727.7090205@wasp.net.au>
Date: Wed, 25 Apr 2007 14:02:15 +0400
From: Brad Campbell <brad@...p.net.au>
To: Jens Axboe <jens.axboe@...cle.com>
CC: Neil Brown <neilb@...e.de>, Chuck Ebbert <cebbert@...hat.com>,
lkml <linux-kernel@...r.kernel.org>
Subject: Re: [OOPS] 2.6.21-rc6-git5 in cfq_dispatch_insert
Jens Axboe wrote:
> It looks to be extremely rare. Aliases are extremely rare, front merges
> are rare. And you need both to happen with the details you outlined. But
> it's a large user base, and we've had 3-4 reports on this in the past
> months. So it obviously does happen. I could not make it trigger without
> doctoring the unplug code when I used aio.
Well, not that rare on this particular machine (I had a case where I could reproduce it in less than
an hour of normal use previously on this box), and I've had it occur a number of times on my
servers, I just never reported it before as I never took the time to set up a serial console and
capture the oops.
> Here's a fix for it, confirmed.
Shall I leave the other debugging in, apply this and run it for a few hard days?
Brad
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