I also encounter what is most probably this same bug (same assertion at least) in a randomly fashion when using Blender 2.80. My setup is debian unstable with a Radeon HD 7950 (and also GeForce GTX 1060 for Cuda only). I encountered this crash on mesa 18.3.2 (packaged in debian), 18.3.3 and 19.0.0-rc1 (compiled manually)