xorg memory leak

[let rec]

Hi,

I'm experiencing a huge memory leak in xorg.
Sometimes virtual memory size gets up to 12 Gb (I'm not sure how it's
possible on a machine with 2Gb of memory and 2Gb of swap).
My system gets sluggish and I have to restart xorg once a day, which feels
a bit win95ish.
My setup is: Kubuntu 11.10 64 bit, KDE 4.7.4, ati mobility radeon x1350.
I've been hoping that fix of
https://bugs.kde.org/show_bug.cgi?id=271934#c43would resolve the
issue, but it seems it's not the case.
I tried to kill and restart top memory KDE processes to see if the leak is
caused by one of them, but it's not the case either.
My current top output sorted by mem usage looks like:

top - 00:40:51 up 1 day,  6:54,  9 users,  load average: 0.20, 0.18, 0.15
Tasks: 141 total,   1 running, 140 sleeping,   0 stopped,   0 zombie
Cpu(s): 30.6%us, 11.5%sy,  0.0%ni, 57.0%id,  0.0%wa,  0.0%hi,  1.0%si,
0.0%st
Mem:   2056332k total,  1985548k used,    70784k free,      804k buffers
Swap:  1998844k total,   101084k used,  1897760k free,   191648k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+
COMMAND

29075 root      20   0 8373m 692m  29m S   29 34.5  11:22.99
Xorg

29324 user      20   0 1370m 602m  17m S    6 30.0   7:19.01
firefox

29231 user      20   0 1138m  98m  25m S    2  4.9   2:27.75
plasma-desktop

30227 user      20   0  746m  66m  20m S   16  3.3   7:54.23
vlc

29385 user      20   0  581m  49m  19m S    0  2.5   0:11.78
kopete

29219 user      20   0  653m  48m  13m S   17  2.4   3:12.64
kwin

29387 user      20   0  388m  41m 6272 S    4  2.1   3:38.66
plugin-containe

29383 user      20   0  474m  34m  17m S    0  1.7   0:24.46
konversation

29306 user      20   0  427m  30m  15m S    5  1.5   2:55.08
konsole

29257 user      20   0  680m  27m  11m S    0  1.4   0:03.98
krunner

29201 user      20   0  706m  22m  12m S    0  1.1   0:04.03
kded4

29272 user      20   0  647m  20m  10m S    0  1.0   0:00.53
kmix

29209 user      20   0  286m  13m 9756 S    0  0.7   0:00.32
kwalletd

29416 user      20   0  253m  12m 8676 S    0  0.6   0:00.28
kwalletmanager

29276 user      20   0  260m  12m 8528 S    0  0.6   0:00.39
klipper

29269 user      20   0  340m  11m 8152 S    0  0.6   0:00.21 polkit-kde-auth

Does it look sane?
Can someone recommend any way to track root cause of the issue down?
I'm ok to install debug symbols and debug, but not sure what is the most
efficient approach would be.
Any ideas would be much appreciated.

Thanks,
Andrew
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