Hello! Well, recently I upgraded from Kubuntu 12.04 to 12.10 and also
started to experience this issue, it just started to happen since I
upgraded to 12.10, I never experienced it with Precise Pangolin. About
the error message, I don't need to perform a specific task to trigger
it, it has happened when I'm working or when I'm just using the web
browser alike, and there's not a signal to predict when the error is
about occur, and as my computer is my day-to-day working tool, this
issue is very frustrating.

System info:

CPU: Sempron single core 1.8 GHz, 64 bit.
RAM: 3GB
OS: Kubuntu 12.10 (upgraded from 12.04).
Kernel: Linux 3.5.0-25-generic (x86_64)
Nvidia GeForce Go6150 grqphics with nvidia privative controller.

I do dual boot with Windows 7; my /home and / partitions are both in
separated partitions and are formatted as ext4. I ran also fsck test,
and the error has became a bit less frequent, but it persists; also, the
SMART analysis didn't throw any errors.

** Description changed:

  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 20:00:42 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: [  249.196624] 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: [  249.196628] 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: [  249.196634]         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: [  249.196650] 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: [  249.196676] 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: [  249.196679] 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: [  249.196684]         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: [  249.196699] 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: [  249.196739] 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: [  249.196742] 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: [  249.196746]         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: [  249.196761] 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.
+ 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
+  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
+  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
+  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.

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https://bugs.launchpad.net/bugs/1063354

Title:
  Sudden Read-Only Filesystems

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