https://bugs.freedesktop.org/show_bug.cgi?id=64649
--- Comment #15 from romulasry@gmail.com ---
Again, just to make sure you don't search for a bug that is maybe no longer in r600g: I don't have the latest master for Mesa/libdrm, and it'll take me at least a few days, before I can get around to build a new version. Hency you might want to confirm the backtrace with somebody who runs master.
I will the backtrace, could you give me the exact command you used?