loglevel -1 - has not given the infornation.
Slapd - die silent. :(
loglevel in slapd.conf goes to syslog. It needs to be enabled
with something like
# OpenLDAP local4.* /var/log/openldap.log
in /etc/syslog.conf. (After that change, restart syslogd with kill
However, for testing you can intead just do
slapd -h ldap://localhost:3890/ -d -1
Does the end of that output say something useful?