https://bugs.freedesktop.org/show_bug.cgi?id=69341

--- Comment #26 from Peter Zubaj pzubaj@marticonet.sk --- I had similar problem with Fedora rawhide. Recompiling rawhide kernel from source with default config helped. Looks like problem is with some kind of memory trace enabled in kernel (most of cpu time was spend in slab_alloc and slab_free).