linux-kernel - Re: 2.6.20 SATA error

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Message-id: <45E60EBB.7030805@shaw.ca>
Date:	Wed, 28 Feb 2007 17:22:35 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Charles Shannon Hendrix <shannon@...omaker.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Gerhard Mack <gmack@...erfire.net>
Subject: Re: 2.6.20 SATA error

Charles Shannon Hendrix wrote:
> On Wed, 28 Feb 2007 07:40:23 -0500 (EST)
> Gerhard Mack <gmack@...erfire.net> wrote:
> 
>> hello, 
>>
>> Can someone tell me what this means?
>> ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x400000 action 0x2 frozen
>> ata1.00: cmd 35/00:00:40:a6:23/00:04:00:00:00/e0 tag 0 cdb 0x0 data 524288 
>> out
>>          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
>> ata1: port is slow to respond, please be patient (Status 0xd0)
>> ata1: port failed to respond (30 secs, Status 0xd0)
>> ata1: soft resetting port
>> ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
>> ata1.00: configured for UDMA/100
> 
> I am fairly certain this is a bug in the 2.6.20 kernel.
> 
> I never see it in 2.6.19*, just 2.6.20.
> 
> It is some kind of but in the SATA code paths, or at least that's all it
> appears to affect on my system.
> 
> What chipset do you have?
> 
> I have an nforce4 chipset.
> 
> In another thread, I think they were saying it was either a SATA chipset
> driver bug, or a problem in libata core.

There's a known issue with sata_nv on nForce4 controllers running in 
ADMA mode in 2.6.20 (the first released kernel with ADMA support) where 
commands can time out when switching between NCQ commands and non-NCQ 
commands. Hopefully this is fixed in 2.6.21-rc. This doesn't seem to be 
the issue here, since his system isn't using ADMA mode, for reasons 
unclear to me..

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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