Created attachment 82149 [details]
Kernel log

I've got this bug anytime I've tried starting drm-next on my BONAIRE HD7790. It
boots fine, kms seems to work in the console. However, as soon as the X-server
is started the kernel reports a null pointer dereference and it's impossible to
start another X-server instance after.

Kernel version: v3.10 + git://people.freedesktop.org/~agd5f/linux drm-next-3.11
(Jul 6)
xf86-video-ati (git Jul 6)
mesa (git Jul 6)
libdrm (git Jul 6)
llvm (svn Jul 6)