rhel7: modifyrepo exited abnormally

Issue

Modifyrepo output the following error messages and exited abnormally:

# modifyrepo /var/www/html/repos/rhel7/rhel-7-server-aus-rpms/updateinfo.xml \
    /var/www/html/repos/rhel7/rhel-7-server-aus-rpms/repodata/
       Traceback (most recent call last):
         File "/usr/share/createrepo/modifyrepo.py", line 237, in <module>
           ret = main(sys.argv[1:])
         File "/usr/share/createrepo/modifyrepo.py", line 230, in main
           repomd.add(metadata, mdtype=opts.mdtype)
         File "/usr/share/createrepo/modifyrepo.py", line 130, in add
           newmd.write(md)
         File "/usr/lib64/python2.7/gzip.py", line 235, in write
           self.crc = zlib.crc32(data, self.crc) & 0xffffffffL
       OverflowError: size does not fit in an int