I was editing a file, pressed Ctrl+Home to go to the beginning of the file and got a core dump on beta3, linux x64, centos 7.2.
Look for core180904.txt on support for instructions on downloading the compressed core file (too big to upload to support).
The core file is in .tar.xz format for maximum compression. To decompress it, execute:
tar xvf core180904.tar.xz