https://bugs.freedesktop.org/show_bug.cgi?id=12398 This one would fairly regularly nuke my X server. Often opening Evince to view a PDF file would be enough to off it with a signal 11, and rapidly zooming a PDF was a guaranteed way to trigger the bug. Bug and fix described in the last post at time of writing. Thanks for your attention.
In pixman-0.9.5-r1, thanks!