Because we cache the QBindingStatus in QObjects, and the QObjects might outlive the native thread, we can't bind the lifetime of the QBindingStatus solely to the native thread. Instead, keep it alive while the QThreadData associated with the QObject still exists. This is done by moving the BindingStatusOrList member for QThreadPrivate to QThreadData, and by letting QThreadData own the binding status. Pick-to: 6.10 6.9 6.8 6.5 Fixes: QTBUG-126134 Change-Id: I747ec1778f6b6f376c38d1c678dc5b2f62fcb7ef Reviewed-by: Ivan Solovev <ivan.solovev@qt.io> Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>