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(ITS#8669) Slapd service becomes unresponsive intermittently

Full_Name: JM Estrada
Version: 2.4.39
OS: RHEL Linux
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (

I am trying to determine if a problem we are having is a bug or some other issue
with OpenLDAP 2.4.39. 

We have two servers configured as a Master/Slave using syncrepl. Both servers
are running 2.4.39 and at random times, sometimes weeks apart, we are having
issues where the slapd service becomes unresponsive for a period of about 10 to
15 minutes.

When the problem occurs, we see numerous entries in the logs which show an
UNBIND and then a close entry. We then find that the slapd is unresponsive and
will not accept any requests, at the same time the CPU load for slapd skyrockets
to about 100% or very close to it. This lasts for about 10-15 minutes and then
the server recovers itself and again begins responding to requests. 

The problem is intermittent and doesn't seem to coincide with periods of heavy
use versus lower usage.

Is there a known bug with this version that could be causing this?