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When slapd is running with cn=config, and "olcMirrorMode: TRUE" is set, whenever you modify an "olcSyncrepl" attribute, the server is silently taken out of MirrorMode, and you are no longer able to edit the cn=config database until slapd is restarted.

This is observed with openldap-servers-2.4.23-20.el6.x86_64

Steps to Reproduce:
1. Create a server with "olcMirrorMode: TRUE" and perform a modification on an "olcSyncrepl" attribute.
2. Then try to modify anything in the cn=config database.

 
Actual results:
"shadow context; no update referral"


Expected results:
No error


Additional info:
This has been reported and fixed upstream
http://www.openldap.org/its/index.cgi/Software%20Bugs?id=7077
http://www.openldap.org/devel/gitweb.cgi?p=openldap.git;a=commitdiff;h=b8f4e78414d59e76d626b3f0ae1c113ba1b1fc2c

This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.

Confirming. Upstream patch can be applied.

Resolved in: openldap-2.4.23-29.el6

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2013-0364.html