The following layout test is extremely flaky on Mountain Lion WK2 and crashes frequently on Mavericks WK2 fast/dom/Geolocation/notimer-after-unload.html See http://webkit-test-results.appspot.com/dashboards/flakiness_dashboard.html#showAllRuns=true&revision=159343&showExpectations=true&tests=fast%2Fdom%2FGeolocation%2Fnotimer-after-unload.html ASSERTION FAILED: m_frame->document()->parsing() /Volumes/Data/slave/mavericks-debug/build/Source/WebCore/loader/DocumentLoader.cpp(810) : void WebCore::DocumentLoader::commitData(const char *, size_t)
http://trac.webkit.org/changeset/159350
<rdar://problem/15482642>
This doesn't seem to happen any more.