OK, I was able to compile a set of Debian packages for version 2.4.19 using the source obtained from openldap.org.

I have set up a mirror of our production environment (less a few servers). I have two provider servers in mirrormode, and configured for multimaster syncrepl.

So far, no locks, no replication issues, everything seems peachy. Though, in real-life, the problem has a tendency to reappear sometimes a week after a slapd-restart. We'll see what happens. I will continue to update this ticket, detailing any further developments.

Thanks again Pierangelo and Gibson, I appreciate your help.

Jeff