https://bugs.freedesktop.org/show_bug.cgi?id=91084
--- Comment #8 from Eduards Bezverhijs edzis@inbox.lv --- Ok, I installed -dbg packages for mesa/radeon, didn't and had no luck using gdb (or I don't know how to use it to debug radeon/mesa drivers), but I had luck getting some debug out of R600_DEBUG.
Please note "radeon: The kernel rejected CS, see dmesg for more information." and "radeon: Failed to deallocate virtual address for buffer:" in the R600_DEBUG.txt file.
I had 400MB of syslog filled with errors, I took just last 500 lines to upload here.
Hope this will help a bit more with solving the issue. Please advise what can I do more.