https://bugs.freedesktop.org/show_bug.cgi?id=108493
--- Comment #1 from keramidasceid@gmail.com --- I have the exact same problem.
The only differences are the following: * I have the Asus Radeon RX 580 ROG Strix TOP OC 8GB GPU * I use the Unigine Superposition to reproduce the problem quickly * I have kernel 4.18.14 on Fedora 28 * I have mesa 18.0.5