Job still running after "Done. Your build exited with 0."

On Windows, using bash as language and installing bundler from there given that there is no support for Ruby yet.

The build kept running after it finished with 0 status, and eventually failed because “No output has been received in 10m”.

Accordng to Windows build hangs after Done exit 0, this happens if some background processes are still running.

To compare process lists before and after, e.g. run ps -W | sort at appropriate moments, then diff the outputs. To get the command line of the culprit, read /proc/<pid>/cmdline as per