MDB_BAD_RSLOT while executing slapacl

Hello. Today I run slapacl to test access rights and saw this: ldap3# sudo slapacl -F /etc/openldap/slapd.d/ ... ... 52a8ae51 mdb_opinfo_get: err MDB_BAD_RSLOT: Invalid reuse of reader locktable slot(-30783) read access to o: ALLOWED At http://symas.com/mdb/doc/group__errors.html#ga1b6cbb28da30e28c48c9df66dd3... I read explanation that this error means: Txn has too many dirty pages. slapd 2.4.36 with Linux kernel 3.7.10 x86_64. In my slapd I have single database with mdb backend: dn: olcDatabase={1}mdb,config ... olcDbNoSync: FALSE olcDbMaxSize: 1073741824 olcDbMode: 0600 olcDbSearchStack: 16 Two questions: 0. What might cause this error? 1. Should I worry about this?