I'm noticed these errors occur briefly in my logs about the same time as I started getting errors like 'torrent paused: disk write error, seek failed: 'Invalid argument' fd: 49 offset: 2287992832 seekdir: 0' from deluge.  I used smartctl to run a SMART self-test on the disk and it is fine, no errors.  There was a burst of them, all in a few seconds.  I have a Samsung Spinpoint drive.

Dec  2 20:44:27 navybean kernel: [114268.069489] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Dec  2 20:44:30 navybean kernel: [114268.069501] ata1.00: cmd b0/d2:f1:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 123392 in
Dec  2 20:44:30 navybean kernel: [114268.069503]          res 50/00:f1:00:4f:c2/00:00:00:00:00/00 Emask 0x202 (HSM violation)
Dec  2 20:44:30 navybean kernel: [114268.378360] ata1: soft resetting port
Dec  2 20:44:30 navybean kernel: [114268.533962] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
Dec  2 20:44:30 navybean kernel: [114268.550170] ata1.00: configured for UDMA/133
Dec  2 20:44:30 navybean kernel: [114268.550189] ata1: EH complete
Dec  2 20:44:30 navybean kernel: [114268.557593] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Dec  2 20:44:30 navybean kernel: [114268.557603] ata1.00: cmd b0/d2:f1:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 123392 in
Dec  2 20:44:30 navybean kernel: [114268.557605]          res 50/00:f1:00:4f:c2/00:00:00:00:00/00 Emask 0x202 (HSM violation)
Dec  2 20:44:30 navybean kernel: [114268.865094] ata1: soft resetting port
Dec  2 20:44:30 navybean kernel: [114269.020695] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
Dec  2 20:44:30 navybean kernel: [114269.036887] ata1.00: configured for UDMA/133
Dec  2 20:44:30 navybean kernel: [114269.036902] ata1: EH complete
Dec  2 20:44:30 navybean kernel: [114269.040739] sd 0:0:0:0: [sda] 488397168 512-byte hardware sectors (250059 MB)
Dec  2 20:44:30 navybean kernel: [114269.045691] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Dec  2 20:44:30 navybean kernel: [114269.045702] ata1.00: cmd b0/d2:f1:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 123392 in
Dec  2 20:44:30 navybean kernel: [114269.045704]          res 50/00:f1:00:4f:c2/00:00:00:00:00/00 Emask 0x202 (HSM violation)
Dec  2 20:44:30 navybean kernel: [114269.355825] ata1: soft resetting port
Dec  2 20:44:30 navybean kernel: [114269.511415] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
Dec  2 20:44:30 navybean kernel: [114269.527618] ata1.00: configured for UDMA/133
Dec  2 20:44:30 navybean kernel: [114269.527633] ata1: EH complete
Dec  2 20:44:30 navybean kernel: [114269.532399] sd 0:0:0:0: [sda] Write Protect is off
Dec  2 20:44:30 navybean kernel: [114269.532409] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
Dec  2 20:44:30 navybean kernel: [114269.542036] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Dec  2 20:44:30 navybean kernel: [114269.542046] ata1.00: cmd b0/d2:f1:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 123392 in
Dec  2 20:44:30 navybean kernel: [114269.542048]          res 50/00:f1:00:4f:c2/00:00:00:00:00/00 Emask 0x202 (HSM violation)
Dec  2 20:44:30 navybean kernel: [114269.850524] ata1: soft resetting port
Dec  2 20:44:30 navybean kernel: [114270.006130] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
Dec  2 20:44:30 navybean kernel: [114270.022321] ata1.00: configured for UDMA/133
Dec  2 20:44:30 navybean kernel: [114270.022337] ata1: EH complete
Dec  2 20:44:30 navybean kernel: [114270.030100] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Dec  2 20:44:30 navybean kernel: [114270.030111] ata1.00: cmd b0/d2:f1:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 123392 in
Dec  2 20:44:30 navybean kernel: [114270.030113]          res 50/00:f1:00:4f:c2/00:00:00:00:00/00 Emask 0x202 (HSM violation)
Dec  2 20:44:30 navybean kernel: [114270.341247] ata1: soft resetting port
Dec  2 20:44:30 navybean kernel: [114270.496851] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
Dec  2 20:44:30 navybean kernel: [114270.513039] ata1.00: configured for UDMA/133
Dec  2 20:44:30 navybean kernel: [114270.513053] ata1: EH complete
Dec  2 20:44:30 navybean kernel: [114270.516873] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Dec  2 20:44:30 navybean kernel: [114270.526443] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Dec  2 20:44:30 navybean kernel: [114270.526454] ata1.00: cmd b0/d2:f1:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 123392 in
Dec  2 20:44:30 navybean kernel: [114270.526456]          res 50/00:f1:00:4f:c2/00:00:00:00:00/00 Emask 0x202 (HSM violation)
Dec  2 20:44:30 navybean kernel: [114270.835962] ata1: soft resetting port
Dec  2 20:44:30 navybean kernel: [114270.991561] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
Dec  2 20:44:30 navybean kernel: [114271.007767] ata1.00: configured for UDMA/133
Dec  2 20:44:30 navybean kernel: [114271.007791] ata1: EH complete
Dec  2 20:44:30 navybean kernel: [114271.008153] sd 0:0:0:0: [sda] 488397168 512-byte hardware sectors (250059 MB)
Dec  2 20:44:30 navybean kernel: [114271.008175] sd 0:0:0:0: [sda] Write Protect is off
Dec  2 20:44:30 navybean kernel: [114271.008181] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
Dec  2 20:44:30 navybean kernel: [114271.008208] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Dec  2 20:44:30 navybean kernel: [114271.008239] sd 0:0:0:0: [sda] 488397168 512-byte hardware sectors (250059 MB)
Dec  2 20:44:30 navybean kernel: [114271.008256] sd 0:0:0:0: [sda] Write Protect is off
Dec  2 20:44:30 navybean kernel: [114271.008262] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
Dec  2 20:44:30 navybean kernel: [114271.008287] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Dec  2 20:44:30 navybean kernel: [114271.464690] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Dec  2 20:44:30 navybean kernel: [114271.464701] ata1.00: cmd b0/db:f8:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 126976 in
Dec  2 20:44:30 navybean kernel: [114271.464703]          res 50/00:f8:00:4f:c2/00:00:00:00:00/00 Emask 0x202 (HSM violation)
Dec  2 20:44:31 navybean kernel: [114271.773514] ata1: soft resetting port
Dec  2 20:44:31 navybean kernel: [114271.929119] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
Dec  2 20:44:31 navybean kernel: [114271.945325] ata1.00: configured for UDMA/133
Dec  2 20:44:31 navybean kernel: [114271.945342] ata1: EH complete
Dec  2 20:44:31 navybean kernel: [114271.945487] sd 0:0:0:0: [sda] 488397168 512-byte hardware sectors (250059 MB)
Dec  2 20:44:31 navybean kernel: [114271.945525] sd 0:0:0:0: [sda] Write Protect is off
Dec  2 20:44:31 navybean kernel: [114271.945531] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
Dec  2 20:44:31 navybean kernel: [114271.945578] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Dec  2 20:44:31 navybean kernel: [114272.018944] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Dec  2 20:44:31 navybean kernel: [114272.018955] ata1.00: cmd b0/db:f8:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 126976 in
Dec  2 20:44:31 navybean kernel: [114272.018957]          res 50/00:f8:00:4f:c2/00:00:00:00:00/00 Emask 0x202 (HSM violation)
Dec  2 20:44:31 navybean kernel: [114272.328073] ata1: soft resetting port
Dec  2 20:44:31 navybean kernel: [114272.483672] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
Dec  2 20:44:31 navybean kernel: [114272.499876] ata1.00: configured for UDMA/133
Dec  2 20:44:31 navybean kernel: [114272.499893] ata1: EH complete
Dec  2 20:44:31 navybean kernel: [114272.500026] sd 0:0:0:0: [sda] 488397168 512-byte hardware sectors (250059 MB)
Dec  2 20:44:31 navybean kernel: [114272.500057] sd 0:0:0:0: [sda] Write Protect is off
Dec  2 20:44:31 navybean kernel: [114272.500063] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
Dec  2 20:44:31 navybean kernel: [114272.500112] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Dec  2 20:44:31 navybean kernel: [114272.581462] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Dec  2 20:44:31 navybean kernel: [114272.581474] ata1.00: cmd b0/db:f8:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 126976 in
Dec  2 20:44:31 navybean kernel: [114272.581476]          res 50/00:f8:00:4f:c2/00:00:00:00:00/00 Emask 0x202 (HSM violation)
Dec  2 20:44:32 navybean kernel: [114272.890601] ata1: soft resetting port
Dec  2 20:44:32 navybean kernel: [114273.046216] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
Dec  2 20:44:32 navybean kernel: [114273.062410] ata1.00: configured for UDMA/133
Dec  2 20:44:32 navybean kernel: [114273.062426] ata1: EH complete
Dec  2 20:44:32 navybean kernel: [114273.143990] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Dec  2 20:44:32 navybean kernel: [114273.144001] ata1.00: cmd b0/db:f8:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 126976 in
Dec  2 20:44:32 navybean kernel: [114273.144003]          res 50/00:f8:00:4f:c2/00:00:00:00:00/00 Emask 0x202 (HSM violation)
Dec  2 20:44:32 navybean kernel: [114273.453136] ata1: soft resetting port
Dec  2 20:44:32 navybean kernel: [114273.608742] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
Dec  2 20:44:32 navybean kernel: [114273.624932] ata1.00: configured for UDMA/133
Dec  2 20:44:32 navybean kernel: [114273.624947] ata1: EH complete
Dec  2 20:44:32 navybean kernel: [114273.628761] sd 0:0:0:0: [sda] 488397168 512-byte hardware sectors (250059 MB)
Dec  2 20:44:32 navybean kernel: [114273.706506] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Dec  2 20:44:32 navybean kernel: [114273.706518] ata1.00: cmd b0/db:f8:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 126976 in
Dec  2 20:44:32 navybean kernel: [114273.706519]          res 50/00:f8:00:4f:c2/00:00:00:00:00/00 Emask 0x202 (HSM violation)
Dec  2 20:44:33 navybean kernel: [114274.015675] ata1: soft resetting port
Dec  2 20:44:33 navybean kernel: [114274.171279] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
Dec  2 20:44:33 navybean kernel: [114274.187480] ata1.00: configured for UDMA/133
Dec  2 20:44:33 navybean kernel: [114274.187497] ata1: EH complete
Dec  2 20:44:33 navybean kernel: [114274.192145] sd 0:0:0:0: [sda] Write Protect is off
Dec  2 20:44:33 navybean kernel: [114274.192153] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
Dec  2 20:44:33 navybean kernel: [114274.269023] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Dec  2 20:44:33 navybean kernel: [114274.269034] ata1.00: cmd b0/db:f8:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 126976 in
Dec  2 20:44:33 navybean kernel: [114274.269036]          res 50/00:f8:00:4f:c2/00:00:00:00:00/00 Emask 0x202 (HSM violation)
Dec  2 20:44:33 navybean kernel: [114274.578209] ata1: soft resetting port
Dec  2 20:44:33 navybean kernel: [114274.733811] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
Dec  2 20:44:33 navybean kernel: [114274.749998] ata1.00: configured for UDMA/133
Dec  2 20:44:33 navybean kernel: [114274.750021] ata1: EH complete
Dec  2 20:44:33 navybean kernel: [114274.753760] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Dec  2 20:44:34 navybean kernel: [114274.804251] sd 0:0:0:0: [sda] 488397168 512-byte hardware sectors (250059 MB)
Dec  2 20:44:34 navybean kernel: [114274.804272] sd 0:0:0:0: [sda] Write Protect is off
Dec  2 20:44:34 navybean kernel: [114274.804276] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
Dec  2 20:44:34 navybean kernel: [114274.804300] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA