Excessive memory consumption by lightdm-gtk-greeter (Intel graphics controller, 13.04)

[Jason Heeris]

I recently installed Ubuntu (server) 13.04 on a Mac Mini (2012 model). I
have lightdm installed as the display manager, and use the GTK greeter.
I've noticed that after about a day, all of my RAM and swap will be used
up, and htop indicates that the culprit is lightdm-gtk-greeter.

Of course, it's very hard to get diagnostic information at this point
because the system is unresponsive to anything except the REISUB method of
rebooting. I'm not sure whether lightdm-gtk-greeter really is the problem,
or whether it's the graphics driver or some other part of the system.

Pertinent details:

kernel is 3.8.0-33-generic

lspci tells me my graphics adapter is: 00:02.0 VGA compatible controller:
Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)

lshw tells me the driver is the i915 driver.

I have the machine plugged into the TV via an HDMI cable. It's booting via
GRUB2 installed on an HFS+ formatted partition (ie. there's no rEFIt or
anything like that).

The problem occurs even after a clean boot and no interaction whatsoever
with the device, except the occasional SSH in to check on things.

So where should I look for more details? Does anyone know of any
memory-leak related bugs with the lightdm GTK greeter, or the i915 driver,
or some other related component in 13.04? I haven't found anything relevant
on Launchpad (or anywhere else), but maybe I'm looking in the wrong places.

Cheers,
Jason
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