Re: 2.6.20 SATA error

From: Robert Hancock
Date: Wed Feb 28 2007 - 18:24:08 EST


Charles Shannon Hendrix wrote:
On Wed, 28 Feb 2007 07:40:23 -0500 (EST)
Gerhard Mack <gmack@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx
Home Page: http://www.roberthancock.com/

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