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Description of problem:
Please upgrade immediately CLucene 0.9.21 to 0.9.21b to avoid multithread
problems. CLucene 0.9.21b contains a binary compatible fix which fixes a 
potential segfault when used in a multithreaded application. Further details
here: http://sourceforge.net/project/shownotes.php?release_id=635383

CLucene 0.9.21b will be required for Zarafa 6.40.0 hitting the EPEL 6 beta
repository soon. Without CLucene 0.9.21b, the multithreaded zarafa-indexer
is going to crash (reproducible here with 0.9.21).

Version-Release number of selected component (if applicable):
clucene-0.9.21-5.el6

How reproducible:
Everytime

Actual results:
clucene-0.9.21-5.el6

Expected results:
clucene-0.9.21b-1.el6 or better... ;-)

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.

Technical note added. If any revisions are required, please edit the "Technical Notes" field
accordingly. All revisions will be proofread by the Engineering Content Services team.

New Contents:
CLucene has been upgraded to binary compatible version 0.9.21b, fixing multithreading issues (old CLucene wasn't thread safe).

Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.