Locker does not exist

[Bruno Solo <bo.guerin@free.fr>]

Hello

What means those messages in log files (loglevel 256)

Jun 28 21:20:24 viviane slapd[3826]: bdb(o=broceliande): Lock table is
out of available locker entries
Jun 28 21:20:24 viviane slapd[3826]: => bdb_idl_fetch_key: get failed:
Cannot allocate memory (12)
Jun 28 21:20:24 viviane slapd[3854]: bdb(o=broceliande): Locker does not
exist

whith Openldap-2.1.2 and back-bdb.

The slapd freeze and the load average grows up.

is it a matter of threads and/or concurrency.