Having done some more investigation I am quite confident that this is a problem
with the Intel X-Server:
xserver-xorg-video-intel 2:2.6.3-0ubuntu9
When UXA is selected in the xorg.conf as follows:
Section "Device"
Identifier "Configured Video Device"
Driver "intel"
Option "FramebufferCompression" "on"
Option "AccelMethod" "UXA"
Option "Tiling" "No"
EndSection
Then the X server slowly leaks memory until all swap is consumed, at
which point the system becomes unavailable.
If I restart the X server, all the leaked memory is recovered and swap
is empty once again.
Note that UXA is not the default AccelMethod - EXA is. I created an
xorg.conf myself to enable UXA in order to get acceptable video
performance. EXA performance is just awful in this X server for some
reason (can't even enable Compiz or run Google Earth with EXA).
This problem looks similar to bugs #369759 and #360319. Note the latter
bug report claims that his happens with EXA rendering also.
--
High load average, disk read, no apparent reason - 2.6.28-11
https://bugs.launchpad.net/bugs/367377
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