Passing along a bug report that's come through the fedora bug reporting system. (Original bug report here: https://bugzilla.redhat.com/show_bug.cgi?id=752569 ). From that bug report, it is suggested that:
"I strongly suspect that it is a bug in impl. of graphite2::Vector. "designed to have a limited subset of the std::vector api". Seriously?! The mind boggles... Just from a peek into the impl., Vector::swap() has two serious bugs: it does not swap (because it takes its argument by value!) and causes double free."