linux-kernel - Re: [PATCH 00/18] ide: warm-plug support for IDE devices and other goodies

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Message-ID: <20080213100820.GA19955@iram.es>
Date:	Wed, 13 Feb 2008 11:08:20 +0100
From:	Gabriel Paubert <paubert@...m.es>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linuxppc-dev@...abs.org
Subject: Re: [PATCH 00/18] ide: warm-plug support for IDE devices and other goodies

On Tue, Feb 12, 2008 at 01:30:03PM +0100, Gabriel Paubert wrote:
> On Tue, Feb 12, 2008 at 12:49:05PM +0100, Gabriel Paubert wrote:
> > On Fri, Feb 08, 2008 at 07:40:43PM +1100, Benjamin Herrenschmidt wrote:
> > > 
> > > On Fri, 2008-02-08 at 01:44 +0100, Bartlomiej Zolnierkiewicz wrote:
> > > > - couple of fixes and preparatory patches
> > > > 
> > > > - rework of PowerMac media-bay support ([un]register IDE devices instead of
> > > >   [un]registering IDE interface) [ it is the main reason for spamming PPC ML ]
> > > 
> > > Interesting... I was thinking about doing a full remove of the device at
> > > a higher level instead but I suppose what you propose is easier.
> > 
> > Well, I have serious problem on a Pegasos which appeared some time
> > between 2.6.24 and 2.6.25-rc1: at boot I get an infinite string of 
> > 
> > hdb: empty DMA table?
> > 
> > I'm trying to bisect it right now.
> 
> Argh, the first bisect point ended up with timeouts on hdb...
> 
> Flagged as bad, to try to see when the problems started, but 
> I suspect that there are several.

Well, it's worse than this. After 7 or 8 bisections (all flagged
bad) the symptoms changed: the system boots up to the point where
it does not recognize LVM volumes. So there are at least 3 bugs:
1) the timeout on interrupts (only seen on hdb)
2) the empty DMA table messages (seen on hda and hdb)
3) the inability to see logical volumes ("pvs" does not find them,
  they are back when rebooting into 2.6.24). This is the apparently
  the earliest introduced bug (no problems with the disks with that
  version).

I am away from that machine until next Tuesday. IIRC the last git
bisect was something like 160 revisions left.

	Gabriel

> 
> 	Gabriel
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