Comment 90 for bug 550559

I get similar error messages. I'm know on Lucid with the following kernel:
2.6.32-35-generic-pae #78-Ubuntu SMP Tue Oct 11 17:01:12 UTC 2011 i686 GNU/Linux

Although I've experienced similar errors on Natty however I don't have the logs from those freezes anymore.

Anyway here are the latest relevant lines from kern.log:
Dec 7 23:10:09 erik-desktop kernel: [14681.976049] ata1.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x6 frozen
Dec 7 23:10:09 erik-desktop kernel: [14681.976063] ata1.00: failed command: READ FPDMA QUEUED
Dec 7 23:10:09 erik-desktop kernel: [14681.976076] ata1.00: cmd 60/80:00:00:39:50/00:00:2b:00:00/40 tag 0 ncq 65536 in
Dec 7 23:10:09 erik-desktop kernel: [14681.976079] res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
Dec 7 23:10:09 erik-desktop kernel: [14681.976085] ata1.00: status: { DRDY }
Dec 7 23:10:09 erik-desktop kernel: [14681.976094] ata1: hard resetting link
Dec 7 23:10:14 erik-desktop kernel: [14687.500031] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
Dec 7 23:10:14 erik-desktop kernel: [14687.500041] ata1.00: link online but device misclassifed
Dec 7 23:10:19 erik-desktop kernel: [14692.500036] ata1.00: qc timeout (cmd 0xec)
Dec 7 23:10:19 erik-desktop kernel: [14692.500054] ata1.00: failed to IDENTIFY (I/O error, err_mask=0x4)
Dec 7 23:10:19 erik-desktop kernel: [14692.500060] ata1.00: revalidation failed (errno=-5)
Dec 7 23:10:19 erik-desktop kernel: [14692.500072] ata1: hard resetting link
Dec 7 23:10:20 erik-desktop kernel: [14693.152025] ata1: softreset failed (device not ready)
Dec 7 23:10:20 erik-desktop kernel: [14693.152034] ata1: applying SB600 PMP SRST workaround and retrying
Dec 7 23:10:20 erik-desktop kernel: [14693.316033] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
Dec 7 23:10:20 erik-desktop kernel: [14693.345733] ata1.00: configured for UDMA/133
Dec 7 23:10:20 erik-desktop kernel: [14693.345745] ata1.00: device reported invalid CHS sector 0
Dec 7 23:10:20 erik-desktop kernel: [14693.345760] ata1: EH complete
Dec 7 23:10:51 erik-desktop kernel: [14723.976059] ata1.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x6 frozen
Dec 7 23:10:51 erik-desktop kernel: [14723.976072] ata1.00: failed command: READ FPDMA QUEUED
Dec 7 23:10:51 erik-desktop kernel: [14723.976085] ata1.00: cmd 60/80:00:00:39:50/00:00:2b:00:00/40 tag 0 ncq 65536 in
Dec 7 23:10:51 erik-desktop kernel: [14723.976087] res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
Dec 7 23:10:51 erik-desktop kernel: [14723.976093] ata1.00: status: { DRDY }
Dec 7 23:10:51 erik-desktop kernel: [14723.976103] ata1: hard resetting link
Dec 7 23:10:51 erik-desktop kernel: [14724.461023] ata1: softreset failed (device not ready)
Dec 7 23:10:51 erik-desktop kernel: [14724.461034] ata1: applying SB600 PMP SRST workaround and retrying
Dec 7 23:10:52 erik-desktop kernel: [14724.625288] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
Dec 7 23:10:52 erik-desktop kernel: [14724.649901] ata1.00: configured for UDMA/133
Dec 7 23:10:52 erik-desktop kernel: [14724.649911] ata1.00: device reported invalid CHS sector 0
Dec 7 23:10:52 erik-desktop kernel: [14724.649928] ata1: EH complete
Dec 7 23:11:22 erik-desktop kernel: [14754.976061] ata1.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x6 frozen
Dec 7 23:11:22 erik-desktop kernel: [14754.976074] ata1.00: failed command: READ FPDMA QUEUED
Dec 7 23:11:22 erik-desktop kernel: [14754.976087] ata1.00: cmd 60/80:00:00:39:50/00:00:2b:00:00/40 tag 0 ncq 65536 in
Dec 7 23:11:22 erik-desktop kernel: [14754.976090] res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
Dec 7 23:11:22 erik-desktop kernel: [14754.976096] ata1.00: status: { DRDY }
Dec 7 23:11:22 erik-desktop kernel: [14754.976105] ata1