just applied 
> Try also applying the patch of https://bugs.freedesktop.org/show_bug.cgi?id=60034

same problem still

though it started 3x well, then when I open my browser with some pages, and
retry, the corruption in xonotic is back again..

radeon 0000:01:00.0: DMA copy src buffer too small (3221445120 18382848)
[drm:radeon_cs_ib_chunk] *ERROR* Invalid command stream !