Comment 34 for bug 401823

This seems to be biting me too, to the order of once every 15 minutes (closing a firefox tab has by my estimate a 10% chance of crashing the firefox process). Meanwhile, .xsession-errors is flooded with messages from GDK warning of XID collisions.

I run most of the Xorg stack from git and interestingly enough, this behavior started a few weeks ago. I haven't had a chance to try bisecting yet, but as soon I get a chance I'll drop a note.