QAP runs out of space inside docker

Giving QAP a list of subjects, say 20 or so, crashes when the docker runs out of space, presumably due to writing internally to /tmp.
I can get around this by specifying: 
-v /tmp:/tmp
in my docker run call, but is this actually the problem or is it something else?
(Double-posting to BIDS-Apps/QAP and preprocessed-connectomes-project/quality-assessment-protocol)