linux-kernel - bug in libata [was Re: [BUG] ide dma_timer

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Date:	Tue, 19 Jun 2007 09:56:08 -0500
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux@...hpoint-tech.com
Subject: bug in libata [was Re: [BUG] ide dma_timer_expiry, then hard lockup

On Mon, Jun 18, 2007 at 04:22:38PM -0500, linas wrote:
> On Mon, Jun 18, 2007 at 10:04:41PM +0100, Alan Cox wrote:
> > please try using the libata
> > driver. 

Its worse. I get a hard hang (sysrq doesn't work) during boot, 
just when the system goes to read the partition table.

Recap: this is an older dual cpu intel box, with a vintage
HTP366 (and not a newer HPT370) on the system planar.  I'm
testing a configration that works fine with the old ide
drivers.

It looks like libata and scsi comes up. The disk is correctly
recognized; i.e. its brand, model number & size are correctly 
reported. printk shows that it hangs in msdos_partition, trying 
to read the partition table. The drive light is on full-solid,
again suggesting a possible irq storm.

Same behaviour for both 2.6.22-rc5-git1 and for 2.6.22-rc4-mm2

I seem to have trouble turning on scsi logging; it doesn't
seem to generate any output ... 

Any suggestions on how to proceed? 

--linas
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