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Date:	Mon, 17 Mar 2008 08:23:25 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Anders Eriksson <aeriksson@...tmail.fm>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.25-rc4

On Sun, Mar 16 2008, Bartlomiej Zolnierkiewicz wrote:
> On Sunday 16 March 2008, Bartlomiej Zolnierkiewicz wrote:
> 
> [...]
> 
> > I think that we are looking into completely wrong direction...
> 
> Alt-SysRq-T traces that Anders posted shows that the system hangs inside
> block layer, if not clearing DRQ would be the case we should see system
> getting stuck inside IDE (or at least IDE commands timing out)...

The bisect ends up pointing at IDE bits everytime, plus it's io
scheduler independent. So I don't think a generic issue is very likely.

> I really do think that it is the same hang-in-block-layer issue that
> Ingo managed to hit once (his system was using libata)...

There's no data to back any such conclusion up, that would be extremely
hand wavy (at best).

Ingo hit a hang in one boot out of hundreds to thousands. Anders can
reproduce easily, should be easy enough to narrow down.

-- 
Jens Axboe

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