version 0.8.0 - tornado_http with --track-memory does not terminate

I am running pyperformance run -r -m with a self built CPython 3.7.0 on Ubuntu 18.04.2 LTS. The command stalls at tornado_http.

I believe this was introduced with the last version, as version 0.7.0 works without problem. Without --track-memory the problem does not occur either.