Signal 11 is a segmentation fault on Linux systems. It means your program (Godot) is trying to access memory that doesn't belong to it. If it showed up in Dev6, it would most certainly help to file a formal bug report.
That may also help you narrow the issue down on your end, but this is part of why you never want to risk using a dev build on a real project. They just aren't done yet.
...Teefs.