<hunchmode> Perhaps its your version of safe, linuxsecurity.com

safe.pm 2.0.7 and earlier, when used in Perl 5.8.0 and earlier, may allow attackers to break out of safe compartments in (1) Safe::reval or (2) Safe::rdo using a redefined @_ variable, which is not reset between successive calls.

Perhaps perl -T doesn't like that? </hunchmode>