https://bugs.openldap.org/show_bug.cgi?id=10320
--- Comment #1 from sergej sergej+openldap@p5n.pp.ru --- It can be reproduced quite easy on massive groupOfUniqueNames modification, when I try to add user to several group by preparing file with modifications and run `ldapmodify` command.
Obviously no autogroups included directly in these modifications but there are some autogroups that depends on new membership in these modifications.