[CentOS] systemd-journald corruption

I have several recently-installed CentOS 7 servers that keep having
systemd-journald corruption (which stops ALL logging, including syslog).
Interestingly, they are all spam-scanning servers running amavisd-new
(so could be some particular pattern is triggering it).

Is there a "supported" way to just cut systemd-journald out of the
picture and have log entries go straight to rsyslogd?

Has anyone else seen this?
-- 
Chris Adams <linux at cmadams.net>