Honza, that's already fixed for quite a long time ...
* Thu Apr 23 2009 Ondrej Vasik <email@example.com> 7.2-3
- fix segfaults in join (i18n patch) when using multibyte
Closing CURRENTRELEASE - feel free to reopen, if you experience the issue with RHEL-6 packages.
Ah sorry, I've thought that it also shoul be sorted in proper way.
Sorry for misinterpreptation