*** glibc detected *** double free or corruption (fasttop): 0x08214b48 ***

[auspex]

Since latest dist-upgrade in breezy, starting KDM results in this "double free" error. I can override it
by setting the MALLOC_CHECK environment variable.

[auspex (auspex)]

*** Bug 18684 has been marked as a duplicate of this bug. ***

[auspex (auspex)]

Version: 4:3.4.1-0ubuntu4

[Matthew Garrett (mjg59)]

This actually seems to be an X issue. Derek, could you include lspci and
/var/log/Xorg.0.log output? Daniel, this seems to be hitting a lot of laptop
users, so it's probably of high priority.

[Alex Roman (alex-roman)]

This error seems to be related to the i810 driver for Xorg. It happens whenever
X gets started (X, startx, gdm).

If I change (in /etc/X11/xorg.conf) my driver from i810 to vesa, the problem
goes away. However, opengl acceleration is not supported by vesa. And we should
be using the i810 driver in Xorg.

I'll post my Xorg.0.log in a minute.

[Alex Roman (alex-roman)]

vesa driver also doesn't support my "native" resolution of 1280x800

[Alex Roman (alex-roman)]

Created an attachment (id=3286)
The Xorg configuration file

[Alex Roman (alex-roman)]

Created an attachment (id=3287)
Log for startx

[Alex Roman (alex-roman)]

Created an attachment (id=3288)
Xorg.0.log

[Alex Roman (alex-roman)]

I've attached my configuration file, the console output of startx, and the
Xorg.0.log file.

Using vesa also makes my display flicker slightly.

[Matt Zimmerman (mdz)]

Slightly less than WORLD-ENDING severity

[Alex Roman (alex-roman)]

Any more updates on this bug? I am still clueless about how to fix it... or what
is causing it...

[Daniel Stone (daniels)]

i'm guessing that this occurs because of 855resolution running after your driver
has started. does making it run first help?

[Alex Roman (alex-roman)]

I'm not that familiar with the inner workings of the X server. What is
855resolution and how do I run it first?

[Daniel Stone (daniels)]

855resolution is a tool to educate your video BIOS about its native resolution

This bug has been marked as a duplicate of bug 9525.