This is reproducible for me at the moment. I should also mention that it's the gdb child process that spins, using 100% of cpu. I can recover by either killing that process, or restarting gdm as a whole.
Here's my X log in case it helps. ** Attachment added: "xorg.log" http://librarian.launchpad.net/6895847/Xorg.0.log -- gdm won't restart after zapping x https://launchpad.net/bugs/91818 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
