On 12/19/2009 01:13 AM, Mike Cui wrote:
I have an nVidia MCP7A AHCI controller. I upgraded to 2.6.32.2 and my
system deterministically freezes trying to mount file systems. Once in
a while it will come back and finish booting after freezing for 1
minute or 2. dmesg indicates that there were NCQ errors, but 2.6.31
anb before has always worked flawlessly for me. What changed in
2.6.32? I will be more than happy to help track down this issue.
ata1.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x6 frozen
ata1.00: cmd 61/08:00:4f:ad:03/00:00:00:00:00/40 tag 0 ncq 4096 out
res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
ata1: hard resetting link
ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata1.00: configured for UDMA/133
ata1.00: device reported invalid CHS sector 0
Looks like things are timing out, and then go downhill from there. This
explanation of timeout gives some hints on possible causes:
http://ata.wiki.kernel.org/index.php/Libata_error_messages#Error_classes
The ideal would be if you could bisect between 2.6.31 and 2.6.32, to see
if it's a software change that is the cause.
Looking at drivers/ata/ahci.c history, the only thing that -might- cause
problems is 388539f3ff0cf1de926b03f94e1eec112358f74d ('git show $commit'
for full commit info and diff).
Jeff
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