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The root filesystem itself randomly read-only (usually about 3-4hrs after reboot) and needs to be restarted to be able to work again. I've done a fresh install after the problem first appeared after an update but the same problem still exists. What information about the system do you need to help? It's a 64-bit OS and the root file system resides on an SSD. I've run fsck checks on the file system (even after I reformatted the drive). I've also looked at the SMART data and it looks good. I'm usually able to find solutions to my problems with google but I wasn't able to this time. Thanks for all the help.

Output of dmesg at the time of the error:

[ 3633.888132] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[ 3633.888144] ata2.00: failed command: FLUSH CACHE
[ 3633.888159] ata2.00: cmd e7/00:00:00:00:00/00:00:00:00:00/a0 tag 0
[ 3633.888162]          res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
[ 3633.888169] ata2.00: status: { DRDY }
[ 3633.888179] ata2: hard resetting link
[ 3643.908112] ata2: softreset failed (device not ready)
[ 3643.908124] ata2: hard resetting link
[ 3653.928109] ata2: softreset failed (device not ready)
[ 3653.928121] ata2: hard resetting link
[ 3664.500117] ata2: link is slow to respond, please be patient (ready=0)
[ 3688.932102] ata2: softreset failed (device not ready)
[ 3688.932115] ata2: limiting SATA link speed to 3.0 Gbps
[ 3688.932122] ata2: hard resetting link
[ 3694.124121] ata2: softreset failed (device not ready)
[ 3694.124132] ata2: reset failed, giving up
[ 3694.124138] ata2.00: disabled
[ 3694.124146] ata2.00: device reported invalid CHS sector 0
[ 3694.124164] ata2: EH complete
[ 3694.124286] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.124292] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.124301] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 00 11 79 5f 00 04 00 00
[ 3694.124319] end_request: I/O error, dev sda, sector 1145183
[ 3694.124329] Buffer I/O error on device sda2, logical block 80896

Tons of these errors...

[ 3694.125102] Buffer I/O error on device sda2, logical block 81023
[ 3694.125111] EXT4-fs warning (device sda2): ext4_end_bio:258: I/O error writing to inode 915749 (offset 0 size 524288 starting block 143275)
[ 3694.125135] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.125139] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.125147] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 00 11 7d 5f 00 04 00 00
[ 3694.125164] end_request: I/O error, dev sda, sector 1146207
[ 3694.125170] Buffer I/O error on device sda2, logical block 81024

Tons of these errors...


[ 3694.125939] Buffer I/O error on device sda2, logical block 81151
[ 3694.125947] EXT4-fs warning (device sda2): ext4_end_bio:258: I/O error writing to inode 915749 (offset 524288 size 524288 starting block 143403)
[ 3694.125964] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.125969] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.125976] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 00 11 81 5f 00 03 40 00
[ 3694.125991] end_request: I/O error, dev sda, sector 1147231
[ 3694.125998] Buffer I/O error on device sda2, logical block 81152

More of these same Buffer I/O errors...

[ 3694.126618] Buffer I/O error on device sda2, logical block 81255
[ 3694.126626] EXT4-fs warning (device sda2): ext4_end_bio:258: I/O error writing to inode 915749 (offset 1048576 size 425984 starting block 143507)
[ 3694.126641] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.126645] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.126653] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 01 14 4e 67 00 00 50 00
[ 3694.126668] end_request: I/O error, dev sda, sector 18108007
[ 3694.126674] Buffer I/O error on device sda2, logical block 2201249

More of the same types of errors...

[ 3694.126728] Buffer I/O error on device sda2, logical block 2201256
[ 3694.126738] EXT4-fs warning (device sda2): ext4_end_bio:258: I/O error writing to inode 915753 (offset 0 size 32768 starting block 2263508)
[ 3694.126747] Buffer I/O error on device sda2, logical block 2201257
[ 3694.126754] Buffer I/O error on device sda2, logical block 2201258
[ 3694.126762] EXT4-fs warning (device sda2): ext4_end_bio:258: I/O error writing to inode 915754 (offset 0 size 8192 starting block 2263510)
[ 3694.126776] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.126781] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.126788] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 01 14 4e b7 00 00 08 00
[ 3694.126804] end_request: I/O error, dev sda, sector 18108087
[ 3694.126811] Buffer I/O error on device sda2, logical block 2201259
[ 3694.126827] EXT4-fs warning (device sda2): ext4_end_bio:258: I/O error writing to inode 524657 (offset 0 size 4096 starting block 2263511)
[ 3694.126842] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.126847] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.126854] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 05 0b 27 fe 00 00 50 00
[ 3694.126870] end_request: I/O error, dev sda, sector 84617214
[ 3694.126984] Buffer I/O error on device sda4, logical block 749396

More errors...

[ 3694.126986] Buffer I/O error on device sda4, logical block 749397
[ 3694.127004] EXT4-fs warning (device sda4): ext4_end_bio:258: I/O error writing to inode 1043424 (offset 1359872 size 40960 starting block 10577161)
[ 3694.127016] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.127021] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.127028] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 05 1f d5 9e 00 00 88 00
[ 3694.127043] end_request: I/O error, dev sda, sector 85972382
[ 3694.127050] Buffer I/O error on device sda4, logical block 918784

More errors...

[ 3694.127147] Buffer I/O error on device sda4, logical block 918800
[ 3694.127155] EXT4-fs warning (device sda4): ext4_end_bio:258: I/O error writing to inode 1042831 (offset 0 size 69632 starting block 10746564)
[ 3694.127169] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.127174] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.127181] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 05 1f d9 1e 00 01 08 00
[ 3694.127196] end_request: I/O error, dev sda, sector 85973278
[ 3694.127202] Buffer I/O error on device sda4, logical block 918896

More errors...

[ 3694.127396] Buffer I/O error on device sda4, logical block 918928
[ 3694.127405] EXT4-fs warning (device sda4): ext4_end_bio:258: I/O error writing to inode 1042831 (offset 458752 size 135168 starting block 10746692)
[ 3694.127418] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.127422] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.127429] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 05 28 91 d6 00 00 20 00
[ 3694.127444] end_request: I/O error, dev sda, sector 86544854
[ 3694.127451] Buffer I/O error on device sda4, logical block 990343
[ 3694.127463] Buffer I/O error on device sda4, logical block 990344
[ 3694.127469] Buffer I/O error on device sda4, logical block 990345
[ 3694.127475] Buffer I/O error on device sda4, logical block 990346
[ 3694.127484] EXT4-fs warning (device sda4): ext4_end_bio:258: I/O error writing to inode 1043425 (offset 4747264 size 16384 starting block 10818110)
[ 3694.127497] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.127502] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.127509] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 05 28 ee ce 00 00 08 00
[ 3694.127524] end_request: I/O error, dev sda, sector 86568654
[ 3694.127531] quiet_error: 18 callbacks suppressed
[ 3694.127536] Buffer I/O error on device sda4, logical block 993318
[ 3694.127541] lost page write due to I/O error on sda4
[ 3694.127554] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.127558] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.127566] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 05 2c 2d 6e 00 00 08 00
[ 3694.127581] end_request: I/O error, dev sda, sector 86781294
[ 3694.127587] Buffer I/O error on device sda4, logical block 1019898
[ 3694.127592] lost page write due to I/O error on sda4
[ 3694.127608] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.127626] JBD2: Detected IO errors while flushing file data on sda4-8
[ 3694.127628] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.127636] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 05 b5 49 1e 00 00 78 00
[ 3694.127651] end_request: I/O error, dev sda, sector 95766814
[ 3694.127674] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.127679] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.127686] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 06 3e ef 16 00 00 40 00
[ 3694.127702] end_request: I/O error, dev sda, sector 104787734
[ 3694.127708] Buffer I/O error on device sda4, logical block 3270703
[ 3694.127715] Buffer I/O error on device sda4, logical block 3270704
[ 3694.127733] Aborting journal on device sda4-8.
[ 3694.127729] Buffer I/O error on device sda4, logical block 3270705
[ 3694.127737] Buffer I/O error on device sda4, logical block 3270706
[ 3694.127745] Buffer I/O error on device sda4, logical block 3270707
[ 3694.127754] Buffer I/O error on device sda4, logical block 3270708
[ 3694.127760] Buffer I/O error on device sda4, logical block 3270709
[ 3694.127766] Buffer I/O error on device sda4, logical block 3270710
[ 3694.127775] EXT4-fs warning (device sda4): ext4_end_bio:258: I/O error writing to inode 1042850 (offset 0 size 32768 starting block 13098474)
[ 3694.127791] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.127795] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.127802] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 06 40 43 a6 00 00 48 00
[ 3694.127818] end_request: I/O error, dev sda, sector 104874918
[ 3694.127847] EXT4-fs error (device sda4) in ext4_reserve_inode_write:5641: Journal has aborted
[ 3694.127852] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.127857] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.127864] sd 1:0:0:0: [sda] CDB: 
[ 3694.127889] EXT4-fs (sda4): delayed block allocation failed for inode 265108 at logical offset 0 with max blocks 9 with error -5
[ 3694.127902] EXT4-fs (sda4): This should not happen!! Data will be lost
[ 3694.127911] 
[ 3694.127920] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.127927] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.127938] sd 1:0:0:0: [sda] CDB: 
[ 3694.127948] EXT4-fs error (device sda4) in ext4_da_writepages:3033: IO failure
[ 3694.127960] Write(10): 2a 00 04 af ad 9e 00 00 08 00
[ 3694.127984] end_request: I/O error, dev sda, sector 78622110
[ 3694.127981] Write(10)
[ 3694.127997] Buffer I/O error on device sda4, logical block 0
[ 3694.128024] :
[ 3694.128028] lost page write due to I/O error on sda4
[ 3694.128035]  2a 00 02 4c 04 2f 00 00 08 00
[ 3694.128047] end_request: I/O error, dev sda, sector 38536239
[ 3694.128055] end_request: I/O error, dev sda, sector 38536239
[ 3694.128074] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.128083] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.128098] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 05
[ 3694.128125] Aborting journal on device sda2-8.
[ 3694.128134]  b3 ad 9e 00 00 08 00
[ 3694.128157] end_request: I/O error, dev sda, sector 95661470
[ 3694.128171] Buffer I/O error on device sda4, logical block 2129920
[ 3694.128184] lost page write due to I/O error on sda4
[ 3694.128231] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.128240] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.128255] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 02 4b 99
[ 3694.128293] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.128308] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.128325] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 00 07 99 5f 00 00 08 00
[ 3694.128370] end_request: I/O error, dev sda, sector 498015
[ 3694.128385]  5f
[ 3694.128392] Buffer I/O error on device sda2, logical block 0
[ 3694.128404] lost page write due to I/O error on sda2
[ 3694.128417]  00 00 08 00
[ 3694.128439] end_request: I/O error, dev sda, sector 38508895
[ 3694.128451] Buffer I/O error on device sda2, logical block 4751360
[ 3694.128461] lost page write due to I/O error on sda2
[ 3694.128485] JBD2: I/O error detected when updating journal superblock for sda2-8.
[ 3694.128493] JBD2: I/O error detected when updating journal superblock for sda4-8.
[ 3694.128543] EXT4-fs error (device sda2): ext4_journal_start_sb:296: 
[ 3694.128555] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.128565] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.128582] sd 1:0:0:0: [sda] CDB: Write same(16): 93 08 00 00 00 00 05 20 19 9e 00 00 00 c8 00 00
[ 3694.128643] end_request: I/O error, dev sda, sector 85989790
[ 3694.128658] Detected aborted journal
[ 3694.128671] EXT4-fs (sda2): Remounting filesystem read-only
[ 3694.128681] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.128691] EXT4-fs (sda2): previous I/O error to superblock detected
[ 3694.128705] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.128720] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 00 09 15 e7 00 00 08 00
[ 3694.128776] end_request: I/O error, dev sda, sector 595431
[ 3694.128787] Buffer I/O error on device sda2, logical block 12177
[ 3694.128796] lost page write due to I/O error on sda2
[ 3694.128814] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.128823] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.128837] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 00 10 71 5f 00 00 08 00
[ 3694.128892] end_request: I/O error, dev sda, sector 1077599
[ 3694.128902] Buffer I/O error on device sda2, logical block 72448
[ 3694.128911] lost page write due to I/O error on sda2
[ 3694.128940] JBD2: Detected IO errors while flushing file data on sda2-8
[ 3694.128988] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.128997] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.129012] sd 1:0:0:0: [sda] CDB: Write same(16): 93 08 00 00 00 00 01 14 4e 67 00 00 00 50 00 00
[ 3694.129091] end_request: I/O error, dev sda, sector 18108007
[ 3694.129124] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.129133] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.129147] sd 1:0:0:0: [sda] CDB: 
[ 3694.129156] journal commit I/O error
[ 3694.129165] Write(10): 2a 00 00 07 99 5f 00 00 08 00
[ 3694.129204] end_request: I/O error, dev sda, sector 498015
[ 3694.129217] Buffer I/O error on device sda2, logical block 0
[ 3694.129229] lost page write due to I/O error on sda2
[ 3694.129445] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.129456] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.129466] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 04 af ad 9e 00 00 08 00
[ 3694.129486] end_request: I/O error, dev sda, sector 78622110
[ 3694.129496] Buffer I/O error on device sda4, logical block 0
[ 3694.129502] lost page write due to I/O error on sda4
[ 3694.129539] EXT4-fs (sda4): previous I/O error to superblock detected
[ 3694.129592] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.129597] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.129605] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 04 af ad 9e 00 00 08 00
[ 3694.129622] end_request: I/O error, dev sda, sector 78622110
[ 3694.129655] EXT4-fs error (device sda4): ext4_journal_start_sb:296: 
[ 3694.129665] EXT4-fs error (device sda4) in ext4_dirty_inode:5768: Journal has aborted
[ 3694.129679] EXT4-fs (sda4): previous I/O error to superblock detected
[ 3694.129688] Detected aborted journal
[ 3694.129694] EXT4-fs (sda4): Remounting filesystem read-only
[ 3694.129748] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.129755] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.129764] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 04 af ad 9e 00 00 08 00
[ 3694.129783] end_request: I/O error, dev sda, sector 78622110
[ 3694.129853] sd 1:0:0:0: [sda] Unhandled error code
[ 3694.129859] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3694.129867] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 04 af ad 9e 00 00 08 00
[ 3694.129884] end_request: I/O error, dev sda, sector 78622110
[ 3694.129933] EXT4-fs (sda4): ext4_da_writepages: jbd2_start: 654 pages, ino 265108; err -30
[ 3699.128384] sd 1:0:0:0: [sda] Unhandled error code
[ 3699.128393] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3699.128403] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 05 2f ad 9e 00 00 08 00
[ 3699.128422] end_request: I/O error, dev sda, sector 87010718
[ 3699.128430] quiet_error: 3 callbacks suppressed
[ 3699.128437] Buffer I/O error on device sda4, logical block 1048576
[ 3699.128442] lost page write due to I/O error on sda4
[ 3699.128461] sd 1:0:0:0: [sda] Unhandled error code
[ 3699.128466] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3699.128473] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 05 2f ae 1e 00 00 08 00
[ 3699.128489] end_request: I/O error, dev sda, sector 87010846
[ 3699.128495] Buffer I/O error on device sda4, logical block 1048592
[ 3699.128500] lost page write due to I/O error on sda4
[ 3699.128510] sd 1:0:0:0: [sda] Unhandled error code
[ 3699.128515] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3699.128522] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 05 2f b7 5e 00 00 10 00
[ 3699.128537] end_request: I/O error, dev sda, sector 87013214
[ 3699.128542] Buffer I/O error on device sda4, logical block 1048888
[ 3699.128547] lost page write due to I/O error on sda4
[ 3699.128553] Buffer I/O error on device sda4, logical block 1048889
[ 3699.128558] lost page write due to I/O error on sda4
[ 3699.128568] sd 1:0:0:0: [sda] Unhandled error code
[ 3699.128573] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3699.128579] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 05 30 cc 9e 00 00 10 00
[ 3699.128594] end_request: I/O error, dev sda, sector 87084190
[ 3699.128600] Buffer I/O error on device sda4, logical block 1057760
[ 3699.128604] lost page write due to I/O error on sda4
[ 3699.128610] Buffer I/O error on device sda4, logical block 1057761
[ 3699.128615] lost page write due to I/O error on sda4
[ 3699.128625] sd 1:0:0:0: [sda] Unhandled error code
[ 3699.128630] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3699.128637] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 06 2f ad be 00 00 08 00
[ 3699.128652] end_request: I/O error, dev sda, sector 103787966
[ 3699.128657] Buffer I/O error on device sda4, logical block 3145732
[ 3699.128662] lost page write due to I/O error on sda4
[ 3699.128672] sd 1:0:0:0: [sda] Unhandled error code
[ 3699.128676] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3699.128683] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 06 3f ad c6 00 00 08 00
[ 3699.128698] end_request: I/O error, dev sda, sector 104836550
[ 3699.128703] Buffer I/O error on device sda4, logical block 3276805
[ 3699.128708] lost page write due to I/O error on sda4
[ 3699.128718] sd 1:0:0:0: [sda] Unhandled error code
[ 3699.128722] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3699.128729] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 06 af af 6e 00 00 08 00
[ 3699.128744] end_request: I/O error, dev sda, sector 112177006
[ 3699.128749] Buffer I/O error on device sda4, logical block 4194362
[ 3699.128754] lost page write due to I/O error on sda4
[ 3699.128764] sd 1:0:0:0: [sda] Unhandled error code
[ 3699.128768] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3699.128775] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 06 b0 b5 8e 00 00 08 00
[ 3699.128790] end_request: I/O error, dev sda, sector 112244110
[ 3699.128795] Buffer I/O error on device sda4, logical block 4202750
[ 3699.128800] lost page write due to I/O error on sda4
[ 3699.128811] sd 1:0:0:0: [sda] Unhandled error code
[ 3699.128815] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3699.128822] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 06 b0 b8 0e 00 00 08 00
[ 3699.128837] end_request: I/O error, dev sda, sector 112244750
[ 3699.128848] sd 1:0:0:0: [sda] Unhandled error code
[ 3699.128852] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3699.128859] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 04 ef ad d6 00 00 08 00
[ 3699.128874] end_request: I/O error, dev sda, sector 82816470
[ 3699.128884] sd 1:0:0:0: [sda] Unhandled error code
[ 3699.128889] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3699.128896] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 04 ef ae 16 00 00 08 00
[ 3699.128910] end_request: I/O error, dev sda, sector 82816534
[ 3699.128921] sd 1:0:0:0: [sda] Unhandled error code
[ 3699.128925] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3699.128932] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 05 2b f6 ee 00 00 08 00
[ 3699.128947] end_request: I/O error, dev sda, sector 86767342
[ 3704.688655] sd 1:0:0:0: [sda] Unhandled error code
[ 3704.688665] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3704.688675] sd 1:0:0:0: [sda] CDB: Read(10): 28 00 06 b0 b5 8e 00 00 08 00
[ 3704.688693] end_request: I/O error, dev sda, sector 112244110
[ 3704.688729] EXT4-fs (sda4): previous I/O error to superblock detected
[ 3704.688761] sd 1:0:0:0: [sda] Unhandled error code
[ 3704.688766] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3704.688773] sd 1:0:0:0: [sda] CDB: Write(10): 2a 00 04 af ad 9e 00 00 08 00
[ 3704.688789] end_request: I/O error, dev sda, sector 78622110
[ 3704.688796] quiet_error: 4 callbacks suppressed
[ 3704.688802] Buffer I/O error on device sda4, logical block 0
[ 3704.688807] lost page write due to I/O error on sda4
[ 3704.688826] EXT4-fs error (device sda4): ext4_find_entry:934: inode #1043414: comm firefox: reading directory lblock 0
[ 3709.562729] sd 1:0:0:0: [sda] Unhandled error code
[ 3709.562738] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3709.562748] sd 1:0:0:0: [sda] CDB: Read(10): 28 00 04 0e 1b df 00 00 20 00
[ 3709.562766] end_request: I/O error, dev sda, sector 68033503
[ 3709.562896] sd 1:0:0:0: [sda] Unhandled error code
[ 3709.562906] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3709.562915] sd 1:0:0:0: [sda] CDB: Read(10): 28 00 04 0e 1b df 00 00 08 00
[ 3709.562935] end_request: I/O error, dev sda, sector 68033503
[ 3709.563271] sd 1:0:0:0: [sda] Unhandled error code
[ 3709.563281] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3709.563290] sd 1:0:0:0: [sda] CDB: Read(10): 28 00 04 0e 1b df 00 00 08 00
[ 3709.563309] end_request: I/O error, dev sda, sector 68033503
[ 3709.563688] sd 1:0:0:0: [sda] Unhandled error code
[ 3709.563697] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3709.563705] sd 1:0:0:0: [sda] CDB: Read(10): 28 00 04 0e 1c 5f 00 00 20 00
[ 3709.563722] end_request: I/O error, dev sda, sector 68033631
[ 3709.563780] sd 1:0:0:0: [sda] Unhandled error code
[ 3709.563787] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3709.563794] sd 1:0:0:0: [sda] CDB: Read(10): 28 00 04 0e 1c 5f 00 00 08 00
[ 3709.563811] end_request: I/O error, dev sda, sector 68033631
[ 3709.564363] sd 1:0:0:0: [sda] Unhandled error code
[ 3709.564370] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3709.564378] sd 1:0:0:0: [sda] CDB: Read(10): 28 00 03 8c 20 5f 00 00 20 00
[ 3709.564395] end_request: I/O error, dev sda, sector 59514975
[ 3709.564476] sd 1:0:0:0: [sda] Unhandled error code
[ 3709.564483] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3709.564491] sd 1:0:0:0: [sda] CDB: Read(10): 28 00 03 8c 20 5f 00 00 08 00
[ 3709.564507] end_request: I/O error, dev sda, sector 59514975
[ 3709.564814] sd 1:0:0:0: [sda] Unhandled error code
[ 3709.564822] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3709.564830] sd 1:0:0:0: [sda] CDB: Read(10): 28 00 03 8c 20 5f 00 00 08 00
[ 3709.564847] end_request: I/O error, dev sda, sector 59514975
[ 3709.565627] sd 1:0:0:0: [sda] Unhandled error code
[ 3709.565636] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3709.565645] sd 1:0:0:0: [sda] CDB: Read(10): 28 00 03 8c 20 5f 00 00 08 00
[ 3709.565664] end_request: I/O error, dev sda, sector 59514975
[ 3709.565921] sd 1:0:0:0: [sda] Unhandled error code
[ 3709.565928] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3709.565936] sd 1:0:0:0: [sda] CDB: Read(10): 28 00 03 8c 20 5f 00 00 08 00
[ 3709.565952] end_request: I/O error, dev sda, sector 59514975
[ 3709.566243] sd 1:0:0:0: [sda] Unhandled error code
[ 3709.566245] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3709.566248] sd 1:0:0:0: [sda] CDB: Read(10): 28 00 03 8c 20 5f 00 00 08 00
[ 3709.566252] end_request: I/O error, dev sda, sector 59514975
[ 3709.566500] sd 1:0:0:0: [sda] Unhandled error code
[ 3709.566507] sd 1:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[ 3709.566516] sd 1:0:0:0: [sda] CDB: Read(10): 28 00 03 8c 20 5f 00 00 08 00
[ 3709.566533] end_request: I/O error, dev sda, sector 59514975

/etc/fstab:

proc            /proc           proc    nodev,noexec,nosuid 0       0
# / was on /dev/sda2 during installation
UUID=f83e5cde-9d70-422f-a386-b0a75813a29b /               ext4    defaults,noatime 0       1
# /boot was on /dev/sda1 during installation
UUID=ff0e7521-c1bb-4278-b0e0-e215f107428e /boot           ext2    defaults,noatime 0       2
# /home was on /dev/sda4 during installation
UUID=f378f105-8c39-4f34-a2e1-9852c627166e /home           ext4    defaults,noatime 0       2
# swap was on /dev/sda3 during installation
UUID=2b42d60c-c73a-433c-a368-58dd65fac03a none            swap    sw              0       0
share|improve this question
    
For what it's worth, this happened to me maybe a half dozen times with a Patriot SSD, before the disk just disappeared entirely and I had to RMA it. –  Dustin Kirkland Feb 27 '12 at 23:27
    
can U add the info of your /etc/fstab please? –  maniat1k Feb 27 '12 at 23:28
    
@DustinKirkland That's what I'm afraid of, but I want to make sure everything else is working first before I try to RMA a drive that's over a year old (not sure if it's out of warranty or not) –  Joe Feb 27 '12 at 23:35
    
So I called the manufacturer and it's still under warranty, so if everyone recommends RMA'ing the drive, I can. I just wanna make sure it's not an ubuntu error first before going through the whole process. –  Joe Feb 28 '12 at 0:01
    
I'd agree to it being a dying hard disk. Be sure to back up your data! –  roadmr Feb 28 '12 at 2:48

2 Answers 2

Had this same issue with some dell blades running ubuntu. It was a drive caching issue with the RAID mirror. Also a firmware update needed by seagate.

share|improve this answer

Maybe you can add remount to your fstab:

remount Attempt to remount an already-mounted filesystem. This is commonly used to change the mount flags for a filesystem especially to make a readonly filesystem writable. It does not change device or mount point.

share|improve this answer
    
Remount usually makes sense only when you run the mount command, not in fstab, and it doesn't solve the underlying issue that his hard disk seems to be dying / misbehaving. –  roadmr Feb 28 '12 at 2:46

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