Could you post the entire log from journalctl from Sep 19 19:03:04 onwards please. You might want to utilise fpaste as describe here:
Also, please post the output from coredumpctl list setroubleshootd so we can see if the thing is actually dumping a corefile when it segfaults. We can then take a look at that dumpfile assuming a dump is produced which may point the finger at the root cuase of the seg fault.