?? () from /usr/lib/compiz/libunitymtgrabhandles.so
unity::MT::GrabHandleGroup::forEachHandle(std::function<void (boost::shared_ptr<unity::MT::GrabHandle> const&)> const&) () from /usr/lib/compiz/libunitymtgrabhandles.so
UnityMTGrabHandlesWindow::restackHandles() () from /usr/lib/compiz/libunitymtgrabhandles.so
UnityMTGrabHandlesScreen::handleEvent(_XEvent*) () from /usr/lib/compiz/libunitymtgrabhandles.so
CompScreen::handleEvent(_XEvent*) () from /usr/lib/libcompiz_core.so.ABI-20120305