slapd error 49685 in LDAP log

I have the following errors for slapd in the LDAP log, what is wrong?

Jul 24 10:59:28 valencia.cascadaab.se slapd[49685]: => bdb_idl_insert_key: c_get failed: DB_LOCK_DEADLOCK: Locker killed to resolve a deadlock (-30994)

Jul 24 10:59:28 valencia.cascadaab.se slapd[49685]: => bdb_idl_delete_key: c_get failed: DB_LOCK_DEADLOCK: Locker killed to resolve a deadlock (-30994)

Jul 24 10:59:28 valencia.cascadaab.se slapd[49685]: conn=1443 op=5: attribute "entryCSN" index add failure

Jul 24 10:59:28 valencia.cascadaab.se slapd[49685]: conn=1443 op=4: attribute "entryCSN" index delete failure

Jul 24 10:59:28 valencia.cascadaab.se slapd[49685]: conn=1445 op=0 do_extended: unsupported operation "1.3.6.1.4.1.1466.20037"

Jul 24 10:59:28 valencia.cascadaab.se slapd[49685]: => bdb_idl_delete_key: c_get failed: DB_LOCK_DEADLOCK: Locker killed to resolve a deadlock (-30994)

Jul 24 10:59:28 valencia.cascadaab.se slapd[49685]: => bdb_idl_insert_key: c_get failed: DB_LOCK_DEADLOCK: Locker killed to resolve a deadlock (-30994)

I have tried to rebuild the Kerberos configuration, with these instructions, but that does not seem to have helped.

Everything else on my system seems to work fine, network users can log in, DNS is working, web server is working, e-mail is working, backing up with Time Machine on the server (network users) is also working.

I think that my DNS is set up properly, I have done a lot of checking and adjustments to the DNS settings on the server, in the Server app and on the network computers, so that should be ok as I see it. Everything done according to instructions sent to my by Linc Davis.

Regards

Jonas Möller Nielsen

Sweden