Operating system: Ubuntu 18.04
Graphics card: GeForce MX150
Broken: Blender 2.8, commit 9a63fa21eb4
While editing a 2D animation with grease pencil, I switched to the ellipse tool in draw mode. I then drew an ellipse and tried to switch back to the pencil tool. This didn't work and the interface was unresponsive. When I tried to close Blender it offered to save the file, which I did. When I try to open the file now, blender crashes immediately. It is sometimes possible to avoid the crash for a while, but it will always happen as soon as you try editing the seemingly corrupt GP object.
Load the provided .blend file, switch to draw mode for object "Stroke" and try to use any tool. Experience a crash. Also sometimes the drawing is only visible as long as you drag the timebar.