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The upstream problem should be fixed in glibc 2.19 by this commit:

commit b957ced8890a4438c8efe2c15e5abf4e327f25cf
Author: Andreas Schwab <schwab@suse.de>
Date:   Tue Oct 15 10:21:13 2013 +0200

    Don't use gethostbyaddr to determine canonical name