Comment 59 for bug 60288

I'm having the same crash (when running anything that uses GLX)
 since the latest xorg update in edgy-security (1.1.1-0ubuntu12.2)

Backtrace:
 0: /usr/X11R6/bin/X(xf86SigHandler+0x81) [0x80c3971]
 1: [0xffffe420]

Fatal server error:
 Caught signal 11. Server aborting

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This is with NVidia "restricted" drivers, worked fine before the update. I forced a "downgrade" to the old version and I still get the crash.
I'm going to try xserver-xorg-core_1.1.1-0ubuntu12.2tormod_i386.deb and/or reinstalling nvidia drivers. I will report back with the result of my testing.