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[Bernhard <1402551@xxxxxxxxxxxxxxxxxx>]

Furthermore I have tested the KDE effects in 14.04.x (KDE 4.13.3);

When I disable the following KDE effects, the memory leak is not
occurring.

Cover-Switch (in german: 3D-Fenstergalerie) and Flip Switch (3D-
Fensterstapel)

This is the result of testing for one week. 
The memory usage of the graphics card (nvidia-smi) stays normal and the kwin process usage grows to ~ 100 MiB RAM  (2K:2560x1440) and also frees memory back, if windows are closed. Xorg process at ~ 100 MiB.

I will test this further, but I think this two effects were the
culprits.

This problem is only with the nvidia binary driver (tested until
352.09), it is not with the driver nouveau, intel, radeon (fglrx not
tested).

** Changed in: kde-workspace (Ubuntu)
       Status: Confirmed => In Progress

** Changed in: nvidia-graphics-drivers-304-updates (Ubuntu)
       Status: Confirmed => In Progress

** Changed in: nvidia-graphics-drivers-331-updates (Ubuntu)
       Status: Confirmed => In Progress

** No longer affects: xorg-server-lts-utopic (Ubuntu)

** No longer affects: xorg-server-lts-trusty (Ubuntu)

** No longer affects: xorg-server (Ubuntu)

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https://bugs.launchpad.net/bugs/1402551

Title:
  High memory usage of Xorg and kwin after Xorg security updates
  [nvidia]

Status in kde-workspace package in Ubuntu:
  In Progress
Status in nvidia-graphics-drivers-304-updates package in Ubuntu:
  In Progress
Status in nvidia-graphics-drivers-331-updates package in Ubuntu:
  In Progress

Bug description:
  Hello,

  since the Xorg/nvidia security updates last week, I encounter a problem with growing Xorg and kwin memory usage.
  In one hour the memory consumption is at Xorg ~ 270 MiB and at kwin: 300 MB , so the system responds slowly and scrolling is very slow in in dolphin, kwrite, firefox, etc.
  After several hours the system is so slow, that only a restart helps, and then the growing of memory starts again.

  *** My Tests;

  I tried several nvidia drivers, but without success (from:
  https://launchpad.net/~xorg-
  edgers/+archive/ubuntu/ppa/+index?field.series_filter=precise)

  304.125-0ubuntu0.0.1~xedgers12.04.1
  331.113-0ubuntu0.0.1~xedgers12.04.1
  346.22-0ubuntu1~xedgers12.04.1
  (With purging each nvidia driver and fresh installing it)

  *** My configuration;

  Two Kubuntu 12.04.5 PCs with a nvidia card;
  nvidia driver 331.113-0ubuntu0.0.0.3 and 304.125-0ubuntu0.0.0.1
  One pc with the Trusty Xstack (HWE) with Trusty kernel (3.13.0-43.72~precise1) and the other one with the stock kernel (3.2.0-74-generic #109) and stock xstack.

  I use one pc in my office, so it disturbs my work because of the
  slowness and restarts.

  Nvidia Forum Post:

  https://devtalk.nvidia.com/default/topic/797547/linux/memory-leak-in-
  kwin-and-xorg-after-xorg-security-updates/


  
  Thank you for your help!

  Best regards, Bernhard

  *** Problematic packages and other Xorg deps

  nvidia-graphics-drivers-331 (331.113-0ubuntu0.0.0.3) precise-security;
  urgency=medium

    [ Alberto Milone ]
    * debian/substvars:
      - Add support for video ABIs up to 19.
    * debian/templates/dkms_nvidia.conf.in:
      - Drop all the patches.
    * SECURITY UPDATE:
      - CVE-2014-8091, CVE-2014-8098, CVE-2014-8298 (LP: #1400673).
   -- Alberto Milone <email address hidden> Tue, 09 Dec 2014 12:10:46 +0100

  CVE-2014-8298 	RESERVED
  CVE-2014-8098 	out of bounds access in GLX extension
  CVE-2014-8091 	denial of service due to unchecked malloc in client authentication

  nvidia-graphics-drivers-304-updates (304.125-0ubuntu0.0.0.1)

  xorg-server-lts-trusty (2:1.15.1-0ubuntu2~precise4) precise-security;
  urgency=medium

    * SECURITY UPDATE: Dec 2014 security issues - additional fixes
      - debian/patches/CVE-2014-8xxx/003[4567]*.patch: add additional
        fixes not included in original pre-advisory bundle.
   -- Marc Deslauriers <email address hidden> Tue, 09 Dec 2014 17:25:15 -0500

  xorg-server-lts-trusty (2:1.15.1-0ubuntu2~precise3) precise-security;
  urgency=medium

    * SECURITY UPDATE: Dec 2014 protocol handling security issues
      - debian/patches/CVE-2014-8xxx/*.patch: patches from upstream to fix
        a multitude of security issues, including a couple of pre-requisite
        fixes from git.
      - CVE-2014-8091
      - CVE-2014-8092
      - CVE-2014-8093
      - CVE-2014-8094
      - CVE-2014-8095
      - CVE-2014-8096
      - CVE-2014-8097
      - CVE-2014-8098
      - CVE-2014-8099
      - CVE-2014-8100
      - CVE-2014-8101
      - CVE-2014-8102
      - CVE-2014-8103
   -- Marc Deslauriers <email address hidden> Sat, 06 Dec 2014 10:28:55 -0500

  CVE-2014-8091 	denial of service due to unchecked malloc in client authentication
  CVE-2014-8092 	intger overflows in X11 core protocol requests
  CVE-2014-8093 	integer overflows in GLX extension
  CVE-2014-8094 	integer overflows in DRI2 extensions
  CVE-2014-8095 	out of bounds access in XInput extensions
  CVE-2014-8096 	out of bounds access in XC-MISC extension
  CVE-2014-8097 	out of bounds access in DBE extension
  CVE-2014-8098 	out of bounds access in GLX extension
  CVE-2014-8099 	out of bounds access in XVideo extension
  CVE-2014-8100 	out of bounds access in Render extension
  CVE-2014-8101 	out of bounds access in RandR extension
  CVE-2014-8102 	out of bounds access in XFixes extension
  CVE-2014-8103 	out of bounds access in DRI3 & Present extensions

  and other Xorg deps

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