https://bugs.freedesktop.org/show_bug.cgi?id=61182
--- Comment #20 from Chris Fong muteki_f@hotmail.com --- (In reply to comment #16)
No gnome-shell crashes since I've upgraded to Mesa 9.1.1. Will post an update in a few days whether it remains stable or I was just lucky today.
Observed the same gnome-shell crash problem with Mesa 9.1.1 with kernel 3.8.4-202 also. The way how I reproduce this is to have dual monitors. The left one with resolution 1680x1050 (rotated counterclockwise) and the right with 1920x1200. With this setup, gnome-shell will always crash at initial login. If I don't rotate the left monitor, gnome-shell will not crash.