Please check:
http://testresults.qt.io/ci/QtBase_dev_Integration/latest-success/macx-clang_developer-build_OSX_10.9/log.txt.gz
It happened also at https://codereview.qt-project.org/109467
QTBUG-45319 Regression: tst_QDBusMarshall::sendSignalErrors() fails on OS X