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Date:	Mon, 24 Sep 2007 21:37:30 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	"Berck E. Nash" <flyboy@...il.com>
CC:	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: 2.6.23-rc7-mm1 AHCI ATA errors -- won't boot

Berck E. Nash wrote:
> Greetings,
> 
> I get a few million of these on boot-- the system never actually boots.
> Works fine in 2.6.23-rc7.
> 
> [   50.456012] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
> [   50.462484] ata2.00: irq_stat 0x40000001
> [   50.466441] ata2.00: cmd e5/00:00:00:00:00/00:00:00:00:00/a0 tag 0
> cdb 0x0 data 0
> [   50.466442]          res 51/04:00:01:01:80/00:00:00:00:00/a0 Emask
> 0x1 (device error)
> [   50.481914] ata2.00: status: {DRDY ERR }
> [   50.485876] ata2.00: error: {ABRT }
> [   50.489533] ata2.00: configured for UDMA/133
> [   50.493839] ata2: EH complete
> 
> I've attached the entire dmesg and lspci.

Are you "git-friendly"?  A few quick kernel compiles and reboots would 
help us narrow down the problem, given that it's a reproducible regression.

The first step would be to clone the "upstream" branch of 
git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev.git

and see if the problem is reproducible there.  If yes, then you have 
narrowed down the problem to something my ATA devel tree has introduced 
into -mm.

Once the blame has been squared fixed upon me :) you can use git-bisect 
to locate the precise change that broke your setup.

Info at http://kerneltrap.org/node/11753 or 
http://www.kernel.org/pub/software/scm/git/docs/v1.3.3/howto/isolate-bugs-with-bisect.txt
or "man git-bisect"

	Jeff


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