Comment 4 for bug 148466

Here is a part of the boot messages, collected by dmesg, where the error begins::
[ 153.585232] Unable to load NLS charset cp437
[ 153.597155] Unable to load NLS charset cp437
[ 153.705171] ISO 9660 Extensions: RRIP_1991A
[ 198.409513] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
[ 198.409533] ata1.00: cmd a0/01:00:00:00:00/00:00:00:00:00/a0 tag 0 cdb 0x28 data 129024 in
[ 198.409537] res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
[ 198.409562] ata1: soft resetting port
[ 198.893413] ata1.00: configured for UDMA/33
[ 198.893440] ata1: EH complete
[ 228.876693] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
[ 228.876713] ata1.00: cmd a0/01:00:00:00:00/00:00:00:00:00/a0 tag 0 cdb 0x28 data 129024 in
[ 228.876717] res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
[ 228.876742] ata1: soft resetting port
[ 229.360591] ata1.00: configured for UDMA/33
[ 229.360619] ata1: EH complete
[ 259.343870] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
[ 259.343889] ata1.00: cmd a0/01:00:00:00:00/00:00:00:00:00/a0 tag 0 cdb 0x28 data 129024 in
[ 259.343893] res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
[ 259.343918] ata1: soft resetting port
[ 259.827772] ata1.00: configured for UDMA/33
[ 259.827799] ata1: EH complete
[ 289.811055] ata1.00: limiting speed to UDMA/25:PIO4
[ 289.811067] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
[ 289.811082] ata1.00: cmd a0/01:00:00:00:00/00:00:00:00:00/a0 tag 0 cdb 0x28 data 129024 in
[ 289.811086] res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
[ 289.811111] ata1: soft resetting port
[ 290.294952] ata1.00: configured for UDMA/25
[ 290.295012] sr 0:0:0:0: SCSI error: return code = 0x08000002
[ 290.295018] sr0: Current [descriptor]: sense key: Aborted Command
[ 290.295025] Additional sense: No additional sense information
[ 290.295033] Descriptor sense data with sense descriptors (in hex):
[ 290.295038] 72 0b 00 00 00 00 00 0e 09 0c 00 00 00 03 00 00
[ 290.295052] 00 00 00 00 a0 40
[ 290.295061] end_request: I/O error, dev sr0, sector 55320
[ 290.295070] Buffer I/O error on device sr0, logical block 13830
[ 290.295081] Buffer I/O error on device sr0, logical block 13831
[ 290.295087] Buffer I/O error on device sr0, logical block 13832
[ 290.295093] Buffer I/O error on device sr0, logical block 13833
[ 290.295100] Buffer I/O error on device sr0, logical block 13834
[ 290.295106] Buffer I/O error on device sr0, logical block 13835
[ 290.295112] Buffer I/O error on device sr0, logical block 13836
[ 290.295117] Buffer I/O error on device sr0, logical block 13837
[ 290.295123] Buffer I/O error on device sr0, logical block 13838
[ 290.295129] Buffer I/O error on device sr0, logical block 13839
[ 290.295216] ata1: EH complete