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(ITS#6242) PCache cache corruption

Full_Name: Luben Karavelov
Version: 2.4.11-CVS-HEAD
OS: Linux
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (

We are trying to deploy openldap in a e-main and web hosting system for
centralized management of authentication and configuration. The architecture is
one DB server with all the information exposed to slapd server through views and
two or three slapd servers for fail-over and load balancing. Each slapd is
configured to cache positive and negative responses in bdb backend in order to
speed up the LDAP queries (pcache overlay).

The Problem:
Sometimes there appears a cache corruption : after some correct responses the
server starts to reply like there is no such record. The corrupted record does
not expire.

Tested versions:
openldap 2.4.11 (Debian lenny), 2.4.15 (Debian sid), 2.4.17 (compiled from
sources), CVS-HEAD
bdb-4.2, bdb-4.6. bdb-4.7

Current configuration and details follow in next posts.