https://bugs.openldap.org/show_bug.cgi?id=10552
--- Comment #3 from donxenapo@gmail.com --- There was definitely no OS crashing and no power failures involved in any of the user reports, but there is a possibility that our process crashed during the transaction. This is the only flag we pass into LMDB that seems possibly relevant:
mdb_env_open(env.get(), location.c_str(), MDB_NOMETASYNC, 0644)