At some point after su was updated runit can no longer manage process started with su and gives runsv not running errors when starting/stoping services. chpst is bundled with runit and is used as a replacement. However mythbackend gives tuner permissions errors when run with chpst on my systems. Using sudo to start mythbackend doesn't give the tuner errors and runit can manage the process. frontend alos uses su but I am not sure of a solution there.