How to Dump
Creating Dump File
You can either:
Using Visual Studio, run in debug mode (or attach VS: Visual Studio > Debug > Attach to Process > DSGameServer.exe)
and then Visual Studio > Debug > Save Dump As...
Or use Task Manager to create a dump file Task Manager > Processes > DSGameServer.exe (right-click) > Create Dump File
Stick the dmp, exe, pdb, and log\map-server.log in a 7z archive and post a link to the dump in a new issue in the tracker on github. Including the log is optional, but it does help if if there's a log around the time of the crash.