Public bug reported:

After 5 days of uptime, X is using 70% of 8GB RAM that I have in my
machine (according to htop). I tried restarting, but X always just keeps
using more and more RAM. The machine is on Ubuntu 14.04 64bit.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
Uname: Linux 3.13.0-43-generic x86_64
NonfreeKernelModules: fglrx
.tmp.unity.support.test.0:
 
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: Unity
Date: Sat Dec 20 14:09:48 2014
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Caicos PRO [Radeon HD 7450] [1002:677b] 
(prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Device [103c:90b7]
InstallationDate: Installed on 2014-07-14 (159 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: Hewlett-Packard HP Compaq Elite 8300 CMT
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-43-generic 
root=UUID=93f74578-9c5b-4ef0-a3e0-f29949715269 ro
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/16/2013
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: K01 v02.90
dmi.board.asset.tag: CZC4231W0V
dmi.board.name: 3396
dmi.board.vendor: Hewlett-Packard
dmi.chassis.asset.tag: CZC4231W0V
dmi.chassis.type: 3
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: 
dmi:bvnHewlett-Packard:bvrK01v02.90:bd07/16/2013:svnHewlett-Packard:pnHPCompaqElite8300CMT:pvr:rvnHewlett-Packard:rn3396:rvr:cvnHewlett-Packard:ct3:cvr:
dmi.product.name: HP Compaq Elite 8300 CMT
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.11.3+14.04.20141104-0ubuntu1
version.fglrx-installer: fglrx-installer N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.2
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.5
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.3
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Mon Dec 15 13:03:13 2014
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:
 AIGLX error: failed to open /usr/X11R6/lib64/modules/dri/fglrx_dri.so, 
error[/usr/X11R6/lib64/modules/dri/fglrx_dri.so: cannot open shared object 
file: No such file or directory]
 AIGLX error: failed to open /usr/lib64/dri/fglrx_dri.so, 
error[/usr/lib64/dri/fglrx_dri.so: cannot open shared object file: No such file 
or directory]
 AIGLX error: failed to open /usr/X11R6/lib/modules/dri/fglrx_dri.so, 
error[/usr/X11R6/lib/modules/dri/fglrx_dri.so: cannot open shared object file: 
No such file or directory]
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.15.1-0ubuntu2.5
xserver.video_driver: fglrx

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty ubuntu

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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1404493

Title:
  X memory leak - using 5.5GB of RAM after 5 days

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