https://bugs.openldap.org/show_bug.cgi?id=10299
--- Comment #2 from Ondřej Kuzník ondra@mistotebe.net --- Hi Greg, thanks for the report and configuration. The crash comes down to you having ACLs with group membership testing needs to pull the group entry but with the DB not being initialised due to dry-run (-u) you'll see the crash.
Don't know if there is a way to refuse this if a group ACL is encountered in dry-run mode, Howard?