drillbit.sh can start / stop drillbit. Stop command will stop drillbit softly. If drillbit is not stopped during pre-defined time, it it will be killed forcefully (-9).
There is also restart command which basically behaves like stop + start. But in this case stop command is called without kill forcefully flag. This leads to the cases when executing restart it hangs since driilbit is not be able to be killed softly and retries to do it forever.