Comment # 5 on bug 73781 from jospezial@gmx.de

https://bugs.gentoo.org/show_bug.cgi?id=501286
media-libs/mesa crashes x11-drivers/xf86-video-ati[glamor] with SIGFPE with
large textures (when firefox loads a specific website)

x11-libs/glamor-0.6.0
media-libs/mesa-9.2.5
x11-base/xorg-server-1.15.0
Radeon HD 4850 RV770

patch from #c4
https://bugs.freedesktop.org/attachment.cgi?id=92645
works for me

please add it to the source