Comment 3 for bug 883653

Yes, this is due to bad sectors on your hard drive.

Oct 29 20:39:24 ubuntu kernel: [ 1136.493906] ata3.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x0
Oct 29 20:39:24 ubuntu kernel: [ 1136.493913] ata3.00: irq_stat 0x40000008
Oct 29 20:39:24 ubuntu kernel: [ 1136.493919] ata3.00: failed command: READ FPDMA QUEUED
Oct 29 20:39:24 ubuntu kernel: [ 1136.493929] ata3.00: cmd 60/20:00:20:66:07/00:00:16:00:00/40 tag 0 ncq 16384 in
Oct 29 20:39:24 ubuntu kernel: [ 1136.493932] res 51/40:10:30:66:07/00:00:16:00:00/40 Emask 0x409 (media error) <F>
Oct 29 20:39:24 ubuntu kernel: [ 1136.493937] ata3.00: status: { DRDY ERR }
Oct 29 20:39:24 ubuntu kernel: [ 1136.493940] ata3.00: error: { UNC }
Oct 29 20:39:24 ubuntu kernel: [ 1136.497108] ata3.00: configured for UDMA/133
Oct 29 20:39:24 ubuntu kernel: [ 1136.497120] ata3: EH complete
Oct 29 20:39:28 ubuntu kernel: [ 1140.531017] ata3.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x0
Oct 29 20:39:28 ubuntu kernel: [ 1140.531024] ata3.00: irq_stat 0x40000008
Oct 29 20:39:28 ubuntu kernel: [ 1140.531030] ata3.00: failed command: READ FPDMA QUEUED
Oct 29 20:39:28 ubuntu kernel: [ 1140.531044] ata3.00: cmd 60/20:00:20:66:07/00:00:16:00:00/40 tag 0 ncq 16384 in
Oct 29 20:39:28 ubuntu kernel: [ 1140.531046] res 51/40:10:30:66:07/00:00:16:00:00/40 Emask 0x409 (media error) <F>
Oct 29 20:39:28 ubuntu kernel: [ 1140.531050] ata3.00: status: { DRDY ERR }
Oct 29 20:39:28 ubuntu kernel: [ 1140.531052] ata3.00: error: { UNC }

There really isn't much we can do about that so I am setting the bug report to Invalid.