exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen

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I get this on brand new hardware, 2xHitachi Deathstar 320gb SATA2
(sata_via driver)

I get this a lot, the disk makes some sound after heavy IO and then the
system hangs for a few seconds, then this comes up:

ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
ata1.00: cmd 25/00:00:3f:76:30/00:04:00:00:00/e0 tag 0 cdb 0x0 data 524288 in
          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: soft resetting port
ata1.00: configured for UDMA/133
ata1: EH complete
sd 0:0:0:0: [sda] 625142448 512-byte hardware sectors (320073 MB)
sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't
support DPO or FUA
raid1: Disk failure on sdb1, disabling device.

This is on kernel 2.6.23

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