https://bugs.freedesktop.org/show_bug.cgi?id=69694
--- Comment #5 from Marco mpiazza@gmail.com --- Removing xorg.conf leads to the same crash (trace is very similar).
Then I tried with this little xorg.conf (to load glamoregl)
Section "Module" Load "dri2" Load "glamoregl" Load "glx" EndSection
but result is always the same crash.
The only configuration with which I can start Xorg (but with llvmpipe renderer) is the xorg.conf attached.