pipes assert failure: pipes: ../../radeon/radeon_cs_gem.c:129: cs_gem_write_reloc: Assertion `boi->space_accounted' failed.

[YannUbuntu]

Binary package hint: xscreensaver

On Ubuntu 10.04, with lubuntu-desktop installed.

I unlogged my GNOME session, then connected on my lubuntu session. I went into Preferences->Screensaver menu (where I previously selected the "pipes" screensaver), there 2 cases:
1) if I choose not to exit GNOME screensaver deamon, my Xscreensaver don't start
2) if I choose to exit GNOME screensaver deamon, the "pipes" screensaver freezes after about ~8seconds, showing 2 error lines at the top of the frozen pipe image, and then the screen becomes black. (and then if I move my mouse, the black screen disappears, showing my desktop and the Apport window.. see attached data).

I can repeat every time I use the "pipe" screensaver. I could not reproduce with another screensaver.

May be duplicate of Bug #602267

ProblemType: Crash
DistroRelease: Ubuntu 10.04
Package: xscreensaver-gl-extra 5.10-3ubuntu4
ProcVersionSignature: Ubuntu 2.6.32-23.37-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-23-generic i686
Architecture: i386
AssertionMessage: pipes: ../../radeon/radeon_cs_gem.c:129: cs_gem_write_reloc: Assertion `boi->space_accounted' failed.
CheckboxSubmission: 7bf4676ac92338d1d362954586c33b04
CheckboxSystem: bd9978d0ff03d4f55482fc24a6cdac35
CrashCounter: 1
Date: Fri Jul 9 17:51:15 2010
ExecutablePath: /usr/lib/xscreensaver/pipes
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha i386 (20100328)
ProcCmdline: pipes -root
ProcEnviron:
 PATH=(custom, no user)
 LANG=fr_FR.utf8
 SHELL=/bin/bash
Signal: 6
SourcePackage: xscreensaver
StacktraceTop:
 __kernel_vsyscall ()
 raise () from /lib/tls/i686/cmov/libc.so.6
 abort () from /lib/tls/i686/cmov/libc.so.6
 __assert_fail () from /lib/tls/i686/cmov/libc.so.6
 ?? () from /lib/libdrm_radeon.so.1
Title: pipes assert failure: pipes: ../../radeon/radeon_cs_gem.c:129: cs_gem_write_reloc: Assertion `boi->space_accounted' failed.
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare src
XsessionErrors:
 (polkit-gnome-authentication-agent-1:5135): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (polkit-gnome-authentication-agent-1:5141): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #602267, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.