still segfaulting regularily or have weird outputs (flickering screen)

with f28, 4.17rc1 (amdgpu)

    Device: Radeon RX Vega (VEGA10, DRM 3.25.0,
4.17.0-0.rc1.git3.1.fc29.x86_64, LLVM 7.0.0) (0x687f)
mesa-libGL-18.1.0-0.40.git52e93e3.fc28.i686

could be related to the vsync: when the game does start but flickers, when i
change the vsync on and off a couple of time, sometimes it gets normal. Still
segfaulting on the exit of the game