Looks like this is happening with 3.8.1-3 as well :(

Only difference I can see if Ubuntu 14 vs 16?

Any ideas of what I can try?

From: Clayton Dukes <cdukes@logzilla.net>
Date: Sunday, January 1, 2017 at 2:56 PM
To: Syslog-ng users' and developers' mailing list <syslog-ng@lists.balabit.hu>
Subject: v3.9: Core dump on python module

Hey guys, just want you to know Ubuntu16 is dumping core on loading the python module.

Ubuntu14 does not do this.

[2017-01-01T19:54:52.576749] Module loaded and initialized successfully; module='mod-python'

Segmentation fault (core dumped)

-Clayton Dukes