kernel-packages team mailing list archive

[Mélodie <meets@xxxxxx>]

Hi,

On the T60 with 2 GB RAM it has ran during one hour, installing one by
one several little games using the Software Center, and having firefox
and htop running as well as pcmanfm. No problem met so far.

The now I am running the same machine and Ubuntu version with 512 MB ram
and it swaps a little, while Software Center installs one more game,
Firefox running, gThumbs opened, a console, a mousepad editor, and a
"system benchmark and profiler" launched but not active.

It all works fine, with zram enabled and the generic version of the
kernel.

$ uname -rv
3.2.0-57-generic #87-Ubuntu SMP Tue Nov 12 21:38:12 UTC 2013
$

$ $ swapon -s
Filename				Type		Size	Used	Priority
/dev/sda5                               partition	1023996	0	-1
/dev/zram0                              partition	253912	65152	5
$

$ free -m
             total       used       free     shared    buffers     cached
Mem:           495        479         16          0          9         97
-/+ buffers/cache:        373        122
Swap:         1247         63       1184
$


I enclose the file produced for this machine by checkbox-gtk and an additional file done with a "ps -ax" command can be viewed here: http://pastebin.fr/31732

I would be worth trying on the same machine with a pae version perhaps?
I will install it and say tomorrow or the day after if no issue occurred
with the 3.2.0-57-pae.

I don't have a machine to test others, but I will try to find someone
who could have the relevant hardware.

Regards,
Mélodie


** Attachment added: "submission.xml"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1246664/+attachment/3912879/+files/submission.xml

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https://bugs.launchpad.net/bugs/1246664

Title:
  "Buffer I/O error on device zram0, logical block 515067"

Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Precise:
  Fix Committed
Status in “linux” source package in Saucy:
  Fix Released

Bug description:
  SRU Justification:

  Commit 12a7ad3 "zram: avoid access beyond the zram device" introduced
  a regression where valid_io_request() checks if request end coincides
  with disksize (end equals bound).  It fails if we attempt to read
  beyond the bound.

  Impact:

  Several errors will be logged if, for example, zram-config is
  installed:

  [ 14.666280] zram: module is from the staging directory, the quality is unknown, you have been warned.
  [ 14.667040] zram: Creating 1 devices ...
  [ 14.830355] Buffer I/O error on device zram0, logical block 62411
  [ 14.830375] Buffer I/O error on device zram0, logical block 62411
  [ 14.830598] Buffer I/O error on device zram0, logical block 62411
  [ 14.830621] Buffer I/O error on device zram0, logical block 62411
  [ 14.878597] Adding 249644k swap on /dev/zram0. Priority:5 extents:1 across:249644k SS

  Fix:

  Commit 75c7caf5a052ffd8db3312fa7864ee2d142890c4 "zram: allow request
  end to coincide with disksize" fixes the issue by correcting the test
  in valid_io_request() function.

  Testcase:

  I was able to reproduce the issue by simply installing zram-config in
  a precise box.

  =========================================================================================

  This is a duplicate of #1217189, but for some reason neither @oibaf
  nor me can reopen it. It is in "fix released" state, but the problem
  is at most partially solved. It seems that the bug no longer causes
  lockups (described in another bug: #1215513), but is still present (as
  I get error messages on boot screen and after $ dmesg | grep zram).

  If someone has enough privileges to reopen 1217189 for "linux
  (ubuntu)" (I don't know about raring, but no one complains, so it is
  probably ok), and remove this bug (maybe merging this message to the
  comments in 1217189), I would be really grateful.

  Ubuntu 12.04.3 LTS
  Kernel Linux 3.2.0-56-generic-pae (the problem was first observed in 53 and since 54 there are no lockups).
  ---
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices:
   **** List of PLAYBACK Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: ALC268 Analog [ALC268 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: i386
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: ALC268 Analog [ALC268 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  damian     2771 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf8300000 irq 47'
     Mixer name	: 'Realtek ALC268'
     Components	: 'HDA:10ec0268,10280275,00100003'
     Controls      : 16
     Simple ctrls  : 9
  DistroRelease: Ubuntu 12.04
  MachineType: Dell Inc. Vostro1710
  MarkForUpload: True
  NonfreeKernelModules: nvidia wl
  Package: linux (not installed)
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-56-generic-pae root=UUID=bfe81069-1c35-4ccc-a23a-33528ac81877 ro selinux=1 security=selinux quiet splash
  ProcVersionSignature: Ubuntu 3.2.0-56.86-generic-pae 3.2.51
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-56-generic-pae N/A
   linux-backports-modules-3.2.0-56-generic-pae  N/A
   linux-firmware                                1.79.7
  StagingDrivers: zram
  Tags:  precise running-unity staging
  Uname: Linux 3.2.0-56-generic-pae i686
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin netdev plugdev sambashare sudo
  dmi.bios.date: 09/09/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A09
  dmi.board.name: 0X805C
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnDellInc.:bvrA09:bd09/09/2008:svnDellInc.:pnVostro1710:pvrNull:rvnDellInc.:rn0X805C:rvr:cvnDellInc.:ct8:cvrN/A:
  dmi.product.name: Vostro1710
  dmi.product.version: Null
  dmi.sys.vendor: Dell Inc.

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