RHEL6: inconsistent behavior with chgrp and setuid / setgid bits on files

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Issue

RHEL6.5 has inconsistent behavior with chgrp and setuid / setgid bits. A chgrp on file clears setuid bit, but chgrp does not clear setgid bit.

Environment

Red Hat Enterprise Linux 6
- seen on RHEL6.5, at least kernel 2.6.32-431.32.1.el6
NFS or ext4 filesystem (other filesystems likely affected)

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