Comment 56 for bug 297058

I had also similar errors in /var/log/messages:

Nov 16 23:30:22 hostname kernel: res 51/84:af:69:cc:f6/84:00:04:00:00/e0 Emask 0x10 (ATA bus error)
Nov 16 23:30:22 hostname kernel: ata1.00: status: { DRDY ERR }
Nov 16 23:30:22 hostname kernel: ata1.00: error: { ICRC ABRT }
Nov 16 23:30:22 hostname kernel: ata1: soft resetting link
Nov 16 23:30:23 hostname kernel: ata1.00: configured for UDMA/33
Nov 16 23:30:23 hostname kernel: ata1.01: configured for UDMA/100
Nov 16 23:30:23 hostname kernel: ata1: EH complete
Nov 16 23:30:23 hostname kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6
Nov 16 23:30:23 hostname kernel: ata1.00: BMDMA stat 0x65
Nov 16 23:30:23 hostname kernel: ata1.00: failed command: READ DMA EXT
Nov 16 23:30:23 hostname kernel: ata1.00: cmd 25/00:30:e8:cb:f6/00:01:04:00:00/e0 tag 0 dma 155648 in
Nov 16 23:30:23 hostname kernel: res 51/84:af:69:cc:f6/84:00:04:00:00/e0 Emask 0x10 (ATA bus error)
Nov 16 23:30:23 hostname kernel: ata1.00: status: { DRDY ERR }
Nov 16 23:30:23 hostname kernel: ata1.00: error: { ICRC ABRT }
Nov 16 23:30:23 hostname kernel: ata1: soft resetting link
Nov 16 23:30:23 hostname kernel: ata1.00: configured for UDMA/33
Nov 16 23:30:23 hostname kernel: ata1.01: configured for UDMA/100
Nov 16 23:30:23 hostname kernel: ata1: EH complete
Nov 16 23:30:23 hostname kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6
Nov 16 23:30:23 hostname kernel: ata1.00: BMDMA stat 0x65
Nov 16 23:30:23 hostname kernel: ata1.00: failed command: READ DMA EXT
Nov 16 23:30:23 hostname kernel: ata1.00: cmd 25/00:00:18:cd:f6/00:04:04:00:00/e0 tag 0 dma 524288 in
Nov 16 23:30:23 hostname kernel: res 51/84:1f:f9:cd:f6/84:03:04:00:00/e0 Emask 0x10 (ATA bus error)

I got these about after half an hour of reading a big file on harddrive, maybe 1gb or so. Then machine started having freezes from few seconds to a minute maybe. First I thought it must be a hardware problem. I rebooted and freezing continued. I found this report and as crazy solution as it is, inserting a dvd into dvd drive restored functions back to normal.

Previously I had some weird issues playing dvd's with this drive and suspected there was some weirdness in the firmware. I did not pay more attention to it then but now I'm pretty sure there is something wrong with the dvd drive. The system is redhat linux 6 beta kernel 2.6.32-44.2.el6.i686
The dvd type is: TSSTcorp CDDVDW SN-T083.
This is from dmesg:

ata1.00: ATA-7: SAMSUNG HD103UJ, 1AA01113, max UDMA7
ata1.00: 1953525168 sectors, multi 16: LBA48 NCQ (depth 0/32)
ata1.01: ATAPI: TSSTcorp CDDVDW SN-T083A, SB01, max UDMA/100
ata1.01: applying bridge limits
ata1.00: configured for UDMA/133
ata1.01: configured for UDMA/100