After upgrading to ubuntu 12.10, I experience sudden locks of my filesystems (I have a root and a home partition with ext4), in which the filesystems suddenly become mounted readonly. /var/log/syslog shows the following entries:

Oct  7 20:00:42 StudioXPS signond[3510]: signondaemon.cpp 345 init Failed to SUID root. Secure storage will not be available. 
Oct  7 20:02:12 StudioXPS kernel: [  249.193555] ata1.00: exception Emask 0x0 SAct 0x7 SErr 0x0 action 0x0
Oct  7 20:02:12 StudioXPS kernel: [  249.193561] ata1.00: irq_stat 0x40000001
Oct  7 20:02:12 StudioXPS kernel: [  249.193565] ata1.00: failed command: READ FPDMA QUEUED
Oct  7 20:02:12 StudioXPS kernel: [  249.193572] ata1.00: cmd 60/20:00:90:6f:53/00:00:1a:00:00/40 tag 0 ncq 16384 in
Oct  7 20:02:12 StudioXPS kernel: [  249.193572]          res 41/40:20:98:6f:53/00:00:1a:00:00/40 Emask 0x409 (media error) <F>
Oct  7 20:02:12 StudioXPS kernel: [  249.193575] ata1.00: status: { DRDY ERR }
Oct  7 20:02:12 StudioXPS kernel: [  249.193578] ata1.00: error: { UNC }
Oct  7 20:02:12 StudioXPS kernel: [  249.193581] ata1.00: failed command: WRITE FPDMA QUEUED
Oct  7 20:02:12 StudioXPS kernel: [  249.193587] ata1.00: cmd 61/18:08:18:fb:0e/00:00:2b:00:00/40 tag 1 ncq 12288 out
Oct  7 20:02:12 StudioXPS kernel: [  249.193587]          res 41/40:08:98:6f:53/00:00:1a:00:00/40 Emask 0x9 (media error)
Oct  7 20:02:12 StudioXPS kernel: [  249.193590] ata1.00: status: { DRDY ERR }
Oct  7 20:02:12 StudioXPS kernel: [  249.193593] ata1.00: error: { UNC }
Oct  7 20:02:12 StudioXPS kernel: [  249.193596] ata1.00: failed command: WRITE FPDMA QUEUED
Oct  7 20:02:12 StudioXPS kernel: [  249.193602] ata1.00: cmd 61/d8:10:a0:bd:8b/00:00:0d:00:00/40 tag 2 ncq 110592 out
Oct  7 20:02:12 StudioXPS kernel: [  249.193602]          res 41/40:08:98:6f:53/00:00:1a:00:00/40 Emask 0x9 (media error)
Oct  7 20:02:12 StudioXPS kernel: [  249.193605] ata1.00: status: { DRDY ERR }
Oct  7 20:02:12 StudioXPS kernel: [  249.193607] ata1.00: error: { UNC }
Oct  7 20:02:12 StudioXPS kernel: [  249.196606] ata1.00: configured for UDMA/100
Oct  7 20:02:12 StudioXPS kernel: [  249.196622] sd 0:0:0:0: >[sda] Unhandled sense code
Oct  7 20:02:12 StudioXPS kernel: [  249.196624] sd 0:0:0:0: >[sda]  
Oct  7 20:02:12 StudioXPS kernel: [  249.196626] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Oct  7 20:02:12 StudioXPS kernel: [  249.196628] sd 0:0:0:0: >[sda]  
Oct  7 20:02:12 StudioXPS kernel: [  249.196629] Sense Key : Medium Error [current] [descriptor]
Oct  7 20:02:12 StudioXPS kernel: [  249.196633] Descriptor sense data with sense descriptors (in hex):
Oct  7 20:02:12 StudioXPS kernel: [  249.196634]         72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00 
Oct  7 20:02:12 StudioXPS kernel: [  249.196642]         1a 53 6f 98 
Oct  7 20:02:12 StudioXPS kernel: [  249.196645] sd 0:0:0:0: >[sda]  
Oct  7 20:02:12 StudioXPS kernel: [  249.196648] Add. Sense: Unrecovered read error - auto reallocate failed
Oct  7 20:02:12 StudioXPS kernel: [  249.196650] sd 0:0:0:0: >[sda] CDB: 
Oct  7 20:02:12 StudioXPS kernel: [  249.196651] Read(10): 28 00 1a 53 6f 90 00 00 20 00
Oct  7 20:02:12 StudioXPS kernel: [  249.196658] end_request: I/O error, dev sda, sector 441675672
Oct  7 20:02:12 StudioXPS kernel: [  249.196674] sd 0:0:0:0: >[sda] Unhandled sense code
Oct  7 20:02:12 StudioXPS kernel: [  249.196676] sd 0:0:0:0: >[sda]  
Oct  7 20:02:12 StudioXPS kernel: [  249.196678] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Oct  7 20:02:12 StudioXPS kernel: [  249.196679] sd 0:0:0:0: >[sda]  
Oct  7 20:02:12 StudioXPS kernel: [  249.196681] Sense Key : Medium Error [current] [descriptor]
Oct  7 20:02:12 StudioXPS kernel: [  249.196683] Descriptor sense data with sense descriptors (in hex):
Oct  7 20:02:12 StudioXPS kernel: [  249.196684]         72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00 
Oct  7 20:02:12 StudioXPS kernel: [  249.196692]         1a 53 6f 98 
Oct  7 20:02:12 StudioXPS kernel: [  249.196695] sd 0:0:0:0: >[sda]  
Oct  7 20:02:12 StudioXPS kernel: [  249.196697] Add. Sense: Unrecovered read error - auto reallocate failed
Oct  7 20:02:12 StudioXPS kernel: [  249.196699] sd 0:0:0:0: >[sda] CDB: 
Oct  7 20:02:12 StudioXPS kernel: [  249.196700] Write(10): 2a 00 2b 0e fb 18 00 00 18 00
Oct  7 20:02:12 StudioXPS kernel: [  249.196706] end_request: I/O error, dev sda, sector 722402072
Oct  7 20:02:12 StudioXPS kernel: [  249.196710] Buffer I/O error on device sda6, logical block 82899555
Oct  7 20:02:12 StudioXPS kernel: [  249.196718] Buffer I/O error on device sda6, logical block 82899556
Oct  7 20:02:12 StudioXPS kernel: [  249.196722] Buffer I/O error on device sda6, logical block 82899557
Oct  7 20:02:12 StudioXPS kernel: [  249.196725] EXT4-fs warning (device sda6): ext4_end_bio:250: I/O error writing to inode 20709582 (offset 0 size 12288 starting block 90300262)
Oct  7 20:02:12 StudioXPS kernel: [  249.196726] JBD2: Detected IO errors while flushing file data on sda6-8
Oct  7 20:02:12 StudioXPS kernel: [  249.196737] sd 0:0:0:0: >[sda] Unhandled sense code
Oct  7 20:02:12 StudioXPS kernel: [  249.196739] sd 0:0:0:0: >[sda]  
Oct  7 20:02:12 StudioXPS kernel: [  249.196740] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Oct  7 20:02:12 StudioXPS kernel: [  249.196742] sd 0:0:0:0: >[sda]  
Oct  7 20:02:12 StudioXPS kernel: [  249.196743] Sense Key : Medium Error [current] [descriptor]
Oct  7 20:02:12 StudioXPS kernel: [  249.196745] Descriptor sense data with sense descriptors (in hex):
Oct  7 20:02:12 StudioXPS kernel: [  249.196746]         72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00 
Oct  7 20:02:12 StudioXPS kernel: [  249.196754]         1a 53 6f 98 
Oct  7 20:02:12 StudioXPS kernel: [  249.196758] sd 0:0:0:0: >[sda]  
Oct  7 20:02:12 StudioXPS kernel: [  249.196759] Add. Sense: Unrecovered read error - auto reallocate failed
Oct  7 20:02:12 StudioXPS kernel: [  249.196761] sd 0:0:0:0: >[sda] CDB: 
Oct  7 20:02:12 StudioXPS kernel: [  249.196762] Write(10): 2a 00 0d 8b bd a0 00 00 d8 00
Oct  7 20:02:12 StudioXPS kernel: [  249.196768] end_request: I/O error, dev sda, sector 227261856
Oct  7 20:02:12 StudioXPS kernel: [  249.196781] ata1: EH complete
Oct  7 20:02:12 StudioXPS kernel: [  249.196810] Aborting journal on device sda6-8.
Oct  7 20:02:12 StudioXPS kernel: [  249.197216] EXT4-fs error (device sda6): ext4_journal_start_sb:370: Detected aborted journal
Oct  7 20:02:12 StudioXPS kernel: [  249.197219] EXT4-fs (sda6): Remounting filesystem read-only
Oct  7 20:02:13 StudioXPS kernel: [  250.934678] ecryptfs_encrypt_page: Error attempting to write lower page; rc = [-30]
Oct  7 20:02:13 StudioXPS kernel: [  250.934691] ecryptfs_write_end: Error encrypting page (upper index [0x0000000000000078])
Oct  7 20:02:13 StudioXPS kernel: [  250.938886] ecryptfs_encrypt_page: Error attempting to write lower page; rc = [-30]
Oct  7 20:02:13 StudioXPS kernel: [  250.938896] ecryptfs_write_end: Error encrypting page (upper index [0x0000000000000050])
Oct  7 20:02:13 StudioXPS kernel: [  250.939062] ecryptfs_encrypt_page: Error attempting to write lower page; rc = [-30]
Oct  7 20:02:13 StudioXPS kernel: [  250.939068] ecryptfs_writepage: Error encrypting page (upper index [0x0000000000000000])
Oct  7 20:02:21 StudioXPS kernel: [  259.082126] ecryptfs_encrypt_page: Error attempting to write lower page; rc = [-30]
Oct  7 20:02:21 StudioXPS kernel: [  259.082138] ecryptfs_write_end: Error encrypting page (upper index [0x0000000000000005])
Oct  7 20:02:21 StudioXPS kernel: [  259.082257] ecryptfs_encrypt_page: Error attempting to write lower page; rc = [-30]
Oct  7 20:02:21 StudioXPS kernel: [  259.082262] ecryptfs_write_end: Error encrypting page (upper index [0x0000000000000003])
Oct  7 20:02:21 StudioXPS kernel: [  259.082376] ecryptfs_encrypt_page: Error attempting to write lower page; rc = [-30]
Oct  7 20:02:21 StudioXPS kernel: [  259.082381] ecryptfs_write_end: Error encrypting page (upper index [0x0000000000000000])
Oct  7 20:05:16 StudioXPS kernel: [  433.841434] ecryptfs_encrypt_page: Error attempting to write lower page; rc = [-30]
Oct  7 20:05:16 StudioXPS kernel: [  433.841448] ecryptfs_write_end: Error encrypting page (upper index [0x00000000000000c9])
Oct  7 20:07:57 StudioXPS sudo: pam_ecryptfs: pam_sm_authenticate: /home/lars is already mounted


The harddrive is one month old and has no defects (AFAIK). The problem arises anywhere between directly after boot and 3h into working. A remount with mount -o remount,rw is not possible and aborted with an error. Since I will most certainly loose data during work, this renders my system unusable for the moment. The problem did not occur when running 12.04.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: linux-image-3.5.0-17-generic 3.5.0-17.27
ProcVersionSignature: Ubuntu 3.5.0-17.27-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
ApportVersion: 2.6.1-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  lars       2341 F.... pulseaudio
 /dev/snd/controlC0:  lars       2341 F.... pulseaudio
Date: Sun Oct  7 20:00:11 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Beta amd64 (20120926)
MachineType: Dell Inc. Studio XPS 1640
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.5.0-17-generic root=UUID=68856248-4726-45a0-84b2-670a468cce31 ro quiet splash
RelatedPackageVersions:
 linux-restricted-modules-3.5.0-17-generic N/A
 linux-backports-modules-3.5.0-17-generic  N/A
 linux-firmware                            1.94
RfKill:
 0: phy0: Wireless LAN
 	Soft blocked: no
 	Hard blocked: yes
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/19/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A12
dmi.board.name: 0W497D
dmi.board.vendor: Dell Inc.
dmi.board.version: A12
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A12
dmi.modalias: dmi:bvnDellInc.:bvrA12:bd11/19/2009:svnDellInc.:pnStudioXPS1640:pvrA123:rvnDellInc.:rn0W497D:rvrA12:cvnDellInc.:ct8:cvrA12:
dmi.product.name: Studio XPS 1640
dmi.product.version: A123
dmi.sys.vendor: Dell Inc.