memory leak leads to extremely high memory usage

Leaving this desktop PC running overnight, while logged in and a bunch of windows open, compiz tends to get completely out of control. This morning I arrived to it using 5500MB of RAM (pushing some of the system into swap and making everything extremely slow). This makes the system unusable (as compiz and the memory heavy applications running don't fit into RAM anymore, using the desktop is just not viable...)

The workaround is to kill -KILL compiz whenever it happens.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: compiz 1:0.9.7.8-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-24.38-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,imgpng,move,mousepoll,regex,snap,animation,place,unitymtgrabhandles,expo,resize,ezoom,gnomecompat,grid,vpswitch,wall,session,workarounds,fade,scale,unityshell]
CompositorRunning: compiz
Date: Thu May 31 09:42:36 2012
DistUpgraded: 2012-04-30 11:33:19,127 DEBUG enabling apt cron job
DistroCodename: precise
DistroVariant: ubuntu
DkmsStatus:
 virtualbox, 4.1.12, 3.0.0-12-generic, x86_64: installed
 virtualbox, 4.1.12, 3.2.0-24-generic, x86_64: installed
 virtualbox, 4.1.12, 3.2.0-25-generic, x86_64: installed
GraphicsCard:
 Advanced Micro Devices [AMD] nee ATI RV620 LE [Radeon HD 3450] [1002:95c5] (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:0342]
MachineType: Dell Inc. OptiPlex 960
PackageArchitecture: all
ProcKernelCmdLine: root=UUID=d2cdb369-1d00-4875-b764-6e0a2ea51c34 ro quiet splash
SourcePackage: compiz
UpgradeStatus: Upgraded to precise on 2012-04-30 (30 days ago)
dmi.bios.date: 04/29/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04
dmi.board.name: 0H634K
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 6
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA04:bd04/29/2009:svnDellInc.:pnOptiPlex960:pvr:rvnDellInc.:rn0H634K:rvrA00:cvnDellInc.:ct6:cvr:
dmi.product.name: OptiPlex 960
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.7.8-0ubuntu1
version.ia32-libs: ia32-libs 20090808ubuntu36
version.libdrm2: libdrm2 2.4.32-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3.1
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1.1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2