tarbuck@futurewest.ca writes:

backtrace shows what looks to be a double free() call from lber. This is a production system, so I don't have a whole lot of information (fixing was the priority).

Well, can you show that backtrace? Otherwise there's no chance at all of investigating this further. slapd uses liblber for a lot of its allocations, so the double free could come from just about anywhere.