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bdb_locker_id: err Cannot allocate memory(12)


I have a problem with an OpenLDAP server version 2.3.30. It is configured
with many databases (more than 100), and when I try a search I get this
error message:
bdb_locker_id: err Cannot allocate memory(12)

I tried to play with different parameters of DB_CONFIG (locks, cache_size,
etc.) and slapd.conf (threads in particular) but without any result.

Looking at the code I found that the function ldap_pvt_thread_pool_setkey
(where it seems the error is from) doesn't allocate memory, but uses a
fixed size table ctx of length MAXKEYS.
Do you think I need to increase the MAXKEYS value, or that the problem is
from somewhere else?

Thanks in advance for your help,
Raphaël Ouazana.