linux-kernel - Re: 2.6.18-rc2 Intermittent failures to detect sata disks

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Date:	Tue, 25 Jul 2006 16:49:01 +1000
From:	Keith Owens <kaos@....com.au>
To:	Jeff Garzik <jgarzik@...ox.com>
cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.18-rc2 Intermittent failures to detect sata disks 

Keith Owens (on Tue, 25 Jul 2006 16:27:34 +1000) wrote:
>Jeff Garzik (on Tue, 25 Jul 2006 01:57:08 -0400) wrote:
>>Keith Owens wrote:
>>> Keith Owens (on Fri, 21 Jul 2006 16:18:47 +1000) wrote:
>>>> I am seeing an intermittent failures to detect sata disks on
>>>> 2.6.18-rc2.  Dell SC1425, PIIX chipset, gcc 4.1.0 (opensuse 10.1).
>>>> Sometimes it will detect both disks, sometimes only one, sometimes none
>>>> at all.  AFAICT it only occurs after a soft reboot, and possibly only
>>>> after an emergency reboot.  Alas the problem is so intermittent that it
>>>> is hard to tell what conditions will trigger it.
>>> 
>>> I applied the debug patch below, turn on prink timing and set
>>> initdefault to 6 so the machine was in a continual soft reboot cycle.
>>> After multiple cycles I got this trace.  piix_sata_prereset() reads a
>>> zero config byte for almost 15 seconds then it changes to 0x11,
>>> followed by a hang.  Why is the config byte initially zero, and what
>>> makes it change?  The normal value for pcs is 0x33.
>>
>>Can you try 2.6.18-rc2-git3?
>>
>>	Jeff
>
>Running now, with the trivial bug fix below plus my debug patch.  I
>will leave it running overnight, this problem is very intermittent.

Failed again on 2.6.18-rc2-git3.  80+ seconds of this before I killed
the power.  No sign of it getting any data from the sata PCI config.

[    8.689136] piix_sata_prereset: ata1: ENTER, pcs=0x0 base=0
[    8.755861] piix_sata_prereset: ata1: LEAVE, pcs=0x0 present=0x0
[    8.827741] piix_sata_prereset: ata1: ENTER, pcs=0x0 base=0
[    8.894446] piix_sata_prereset: ata1: LEAVE, pcs=0x0 present=0x0

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