[Bug 657744] [NEW] Periodic machine lockups, every 10 seconds

[Julien Oster]

Public bug reported:

Since updating to Ubuntu 10.10 (Maverick), my 5 y/o Sony VAIO Laptop
experiences periodic short lockups (<1s) every 10 seconds.

During the lockup, everything stands still. No kind of output (mouse
cursor movement, text output in console etc.) takes place, further
evidenced by the fact that if sound is playing, the soundcard stutters
on what seems to be the last sample in the buffer. Then everything
resumes and works normally until the next lockup.

I wrote a small python script that constantly outputs the current system
time to a file and Matlab to draw a plot of the reported time
differences. The plot can be found attached to this bug or here:
http://dl.dropbox.com/u/6617799/hangplot.png

(the python script that generates the data can be found at
http://dl.dropbox.com/u/6617799/dumptime.py)

Assuming that system time is unaffected by the problem, you can see that
the time between soft lockups is about 10 seconds. Here are the exact
differences:

   10.5005   10.7519   10.5282   10.7829   10.5291   10.7840   10.4960   10.8160
   10.4640   10.8840

Duration of a lockup seems to alternate between (very roughly) 0.25s and
0.5s:

    0.2539    0.4277    0.3080    0.4437    0.2969    0.4394    0.2817    0.4602
    0.2723    0.4935    0.2259

Please note that this is not an exact measurement, may contain sampling
errors and that it works on the assumption that the system time as
returned by the system call is unaffected. I just wanted a quick way to
estimate intervals and duration of the lockups.

Let me know if I can provide anything else!

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-22-generic 2.6.35-22.33
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  ejelly     3139 F.... pulseaudio
 /dev/snd/pcmC0D0p:   ejelly     3139 F...m pulseaudio
 /dev/snd/timer:      ejelly     3139 f.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'I82801DBICH4'/'Intel 82801DB-ICH4 with AD1981B at irq 9'
   Mixer name	: 'Analog Devices AD1981B'
   Components	: 'AC97a:41445374'
   Controls      : 28
   Simple ctrls  : 20
Date: Sun Oct 10 17:15:39 2010
HibernationDevice: RESUME=UUID=96440400-451e-0100-0000-000002000000
MachineType: Sony Corporation PCG-TR5MP(CH)
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.35-22-generic root=UUID=b93066f0-fe9a-4af0-9a57-d6b0b45e6f44 ro splash quiet
ProcEnviron:
 LANGUAGE=en
 PATH=(custom, user)
 LANG=de_DE.UTF-8
 SHELL=/bin/zsh
RelatedPackageVersions: linux-firmware 1.38
SourcePackage: linux
dmi.bios.date: 11/28/2003
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: R0111G1
dmi.chassis.asset.tag: 4B1M0000000000000000001a0000
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrR0111G1:bd11/28/2003:svnSonyCorporation:pnPCG-TR5MP(CH):pvrJ000BNDH:cvnSonyCorporation:ct10:cvrN/A:
dmi.product.name: PCG-TR5MP(CH)
dmi.product.version: J000BNDH
dmi.sys.vendor: Sony Corporation

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 kernel-uncat maverick needs-upstream-testing regression-release

-- 
Periodic machine lockups, every 10 seconds
https://bugs.launchpad.net/bugs/657744
You received this bug notification because you are a member of Kernel
Bugs, which is subscribed to linux in ubuntu.