[Okular-devel] [Bug 212305] New: Okular creates disk activity which DoS the computer

[Nicolas Bigaouette]

https://bugs.kde.org/show_bug.cgi?id=212305

           Summary: Okular creates disk activity which DoS the computer
           Product: okular
           Version: 0.9.2
          Platform: Archlinux Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: okular-devel at kde.org
        ReportedBy: nbigaouette at gmail.com


Version:           0.9.2 (using KDE 4.3.2)
Compiler:          gcc version 4.4.2 (GCC) ./configure --prefix=/usr
--enable-shared --enable-languages=c,c++,fortran,objc,obj-c++,ada
--enable-threads=posix --mandir=/usr/share/man --infodir=/usr/share/info
--enable-__cxa_atexit --disable-multilib --libdir=/usr/lib
--libexecdir=/usr/lib --enable-clocale=gnu --disable-libstdcxx-pch
--with-tune=generic
OS:                Linux
Installed from:    Archlinux Packages

I have a recuring problem on my laptop since maybe a year. Today I was able to
reproduce the problem.

The problem is: Everything runs fine, but at some point, the HD will go crazy
and nothing is responsive anymore. The only way to save it is to try to detect
when it starts and before the computer is completely down and reboot it by
pressing the power button (controled by acpid I think) or switching to a
virtual terminal and hitting ctrl+alt+del for a reboot. Most of the time I am
not fast enough and the computer does not respond anymore, with the harddrive
activity led going crazy.

Now to reproduce the problem, I did the following, leading to think the problem
might be with okular:

I have suspended and resumed my computer once yesterday evening. While
suspended, I docked it. I then realized my keyboard did not have battery
anymore, so I hot-undocked it. Now I have been working on a latex file compiled
to pdf. To reproduce the problem, what I need to do is to view the pdflatex
generated file in okular. I then open up a second pdf file (Chapter 2 of
http://www.springerlink.com/content/q1377k/ ) and search for "spherical ha". I
can't remember if I need to search the next occurence or if the first one is
enough, but that triggers the disk activity. Everything seems to freeze, as if
the system was swapping like crazy, even though I don't have swap enabled at
all:
free -m
             total       used       free     shared    buffers     cached
Mem:          2000       1433        567          0         14        517
-/+ buffers/cache:        900       1099
Swap:            0          0          0

The output of "dstat -cdnpmgsf -M topcpu,topbio" is located at
http://pastebin.ca/1648014
(I started that command, in a virtual terminal, went back to X to toggle the
bug, the came back in the console while checking the output of the command.
Then switched to a second console where "ps aux | grep -i okular && pkill
okular" was already entered and was waiting for the "enter" key to run.)

Hardware:
Dell Latitude D830
Core2 Duo T7300 @ 2GHz
2 GB ram
120 GB drive partitioned like this:
  sda1: Dell utility
  sda2: Old, unused XP partition
  sda3: boot ~100MB
  sda4: extended
  sda5: 2GB swap (disabled)
  sda6: ~10GB ext3 /
  sda7: ~90GB ext3 /home
Intel X3100 (965 something, never understood the codes after)

Software:
x86_64
kernel26 2.6.31.5
xf86-video-intel 2.8.1
KDE 4.3.2 with kwin effects on
KMS with "i915.modeset=1" kernel option
Everything else up to date... Note that this problem is happening since a
couple of months, at least. So its not only these versions that are affected...

See also my post on the ArchLinux forum:
http://bbs.archlinux.org/viewtopic.php?pid=646148

Thank you

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