Public bug reported:

Binary package hint: compiz

compiz fails to launch when using sessions preferences/startup programs.

error message [?] *** glibc detected *** /usr/bin/compiz.real: double
free or corruption (!prev): 0x00000000009302e0 ***

see attached .xsession-errors


same script from terminal starts both monitors properly

1)
#!/bin/sh
DISPLAY=:0.0 compiz --only-current-screen --replace --fast-filter 0 &
disown $!
sleep 3


2) 
#!/bin/sh
DISPLAY=:0.1 compiz --only-current-screen --replace --fast-filter &
disown $!
sleep 3

:~$ lsb_release -rd
Description:    Ubuntu 8.04
Release:        8.04

:~$ uname -a
... 2.6.24-19-generic #1 SMP Wed Jun 18 14:15:37 UTC 2008 x86_64 GNU/Linux

 Intel(R) Core(TM)2 Quad CPU           @ 2.66GHz 64bit

:~$ apt-cache policy compiz
compiz:
  Installed: 1:0.7.4-0ubuntu7
  Candidate: 1:0.7.4-0ubuntu7
  Version table:
 *** 1:0.7.4-0ubuntu7 0
        500 http://us.archive.ubuntu.com hardy-updates/main Packages
        100 /var/lib/dpkg/status
     1:0.7.4-0ubuntu6 0
        500 http://us.archive.ubuntu.com hardy/main Packages

:/home/ljohnson# dpkg -l | grep compiz
ii  compiz                                     1:0.7.4-0ubuntu7                 
           OpenGL window and compositing manager
ii  compiz-core                                1:0.7.4-0ubuntu7                 
           OpenGL window and compositing manager
ii  compiz-fusion-plugins-extra                0.7.4-0ubuntu1                   
           Collection of extra plugins from OpenComposi
ii  compiz-fusion-plugins-main                 0.7.4-0ubuntu5                   
           Collection of plugins from OpenCompositing f
ii  compiz-gnome                               1:0.7.4-0ubuntu7                 
           OpenGL window and compositing manager - GNOM
ii  compiz-plugins                             1:0.7.4-0ubuntu7                 
           OpenGL window and compositing manager - plug
ii  compizconfig-backend-gconf                 0.7.4-0ubuntu1                   
           Settings library for plugins - OpenCompositi
ii  compizconfig-settings-manager              0.7.4-0ubuntu2                   
           Compiz configuration settings manager
ii  libcompizconfig0                           0.7.4-0ubuntu1                   
           Settings library for plugins - OpenCompositi
ii  python-compizconfig                        0.7.4-0ubuntu1                   
           Compiz configuration system bindings

The script when run from a termainal works but still reports errors...
:~$ DISPLAY=:0.1 compiz --only-current-screen --replace --fast-filter &
Checking for Xgl: [1] 8111
[EMAIL PROTECTED]:~$ not present. 
Detected PCI ID for VGA: 01:00.0 0300: 10de:0191 (rev a2) (prog-if 00 [VGA 
controller])
0a:00.0 0300: 10de:0191 (rev a2) (prog-if 00 [VGA controller])
Checking for texture_from_pixmap: present. 
Checking for non power of two support: present. 
Checking for Composite extension: present. 
Comparing resolution (2560x1600
1440x900) to maximum 3D texture size (8192
8192): [: 388: 8192: unexpected operator
[: 388: 8192: unexpected operator
Passed.
Checking for nVidia: present. 
Checking for FBConfig: present. 
Checking for Xgl: not present. 
Attempted to unregister path (path[0] = org path[1] = freedesktop) which isn't 
registered
Attempted to unregister path (path[0] = org path[1] = freedesktop) which isn't 
registered
Attempted to unregister path (path[0] = org path[1] = freedesktop) which isn't 
registered
*** glibc detected *** /usr/bin/compiz.real: double free or corruption (!prev): 
0x000000000079cc10 ***
/usr/bin/compiz.real (video) - Warn: No 8 bit GLX pixmap format, disabling YV12 
image format

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

-- 
compiz fails to start with dual monitors
https://bugs.launchpad.net/bugs/242500
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