If you try to run suphp from apache or from the command line it glibc detects a double free and it crashes. It looks like the patch for bug 192415 was included in the source rpm but never actually applied in the spec file before compiling. This is mod_suphp-0.6.1-3.fc6.
An updated version has been pushed to the buildsystem, fixing this oversight. Thx for the heads-up.