linux-kernel - Re: [Regression] 2.6.28-rc1 (2fca5c): libata: kernel cant boot (was: Re: 2.6.27-rc1 (2fca5c): libata: kernel cant boot)

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Date:	Fri, 24 Oct 2008 09:34:59 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Alexander Beregalov <a.beregalov@...il.com>, tj@...nel.org,
	torvalds@...ux-foundation.org, LKML <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org
Subject: Re: [Regression] 2.6.28-rc1 (2fca5c): libata: kernel cant boot (was: Re: 2.6.27-rc1 (2fca5c): libata: kernel cant boot)

On Fri, Oct 24 2008, Rafael J. Wysocki wrote:
> On Friday, 24 of October 2008, Jens Axboe wrote:
> > On Fri, Oct 24 2008, Alexander Beregalov wrote:
> > > Hi
> > > 
> > > commit 2fca5ccf97d2c28bcfce44f5b07d85e74e3cd18e
> > > Author: Jens Axboe <jens.axboe@...cle.com>
> > > Date:   Wed Oct 22 09:34:49 2008 +0200
> > > 
> > >     libata: switch to using block layer tagging support
> > > 
> > > 
> > > This kernel can not read even 0 sector on disk with rootfs. It
> > > initialized disk, but cant read it at all.
> > >  CMD646 on Sparc
> > > 
> > > Rverting helped.
> 
> Confirmed on hp nx6325 w/ pata_atiixp (apparently, SCSI commands time out).

Basically it'll dererence ->qcmd[] with -1 index so it'll break in
various interesting ways, I'm sure.

> Reverting the commit also helps here.
> 
> [I guess it's going to break things left and right.]

Indeed.

> > Doh, how annoying! What driver does that controller use? PATA doesn't
> > even use NCQ, so it's a bit of an oddity that it makes a difference at
> > all.
> > 
> > Can you provide the boot messages?
> 
> If I'm able to reproduce the breakage of Asus L5D, I will.

I don't need that anymore, I realized the mistake right after sending
that.

-- 
Jens Axboe

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