Hi,
that happens from time to time because while running a job in there, the jenkins connection between jenkins master and slave fails. As a result, jenkins decides it's a good idea to kill -9 osmo-gsm-tester process, leaving as a result its child processes alive without anybody controlling them.
I usually take care myself of removing those processes (ps -ef | grep osmo, kill) and cleaning state (rm /var/tmp/osmo-gsm-tester/state/*) when I see lots of tests failing with UNKNOWN during the more-or-less daily jenkins job. Unfortunately, due to being on sick leave these days it may take longer than usual to have this work done after a conn failure, my apologies.
Thanks Neels for taking care of the issue.
Kind regards, Pau