https://bugs.openldap.org/show_bug.cgi?id=10333
--- Comment #1 from Howard Chu hyc@openldap.org --- A fault at mdb.c:2310 would mean the np pointer was invalid.
https://git.openldap.org/openldap/openldap/-/blob/LMDB_0.9.29/libraries/libl...
It's set at either line 2295 or 2297. Are you using WRITEMAP?
SIGBUS is pretty rare on x86, what CPU arch is this?