When the qtMainLoopThread calls QSGThreadedRenderLoop::polishAndSync(), it waits for the QSGRenderThread. In the QSGRenderThread, QAndroidPlatformOpenGLWindow::eglSurface() calls QtAndroid::createSurface() and waits for the "android main thread" to return a valid surface. When the "android main thread" now calls "runInObjectContext" (e.g. by calling QtAndroidAccessibility::childIdListForAccessibleObject()) it waits for the qtMainLoopThread and the program is stuck in a deadlock. To prevent this, we protect all BlockedQueuedConnection from the "android main thread" to the qtMainLoopThread by acquiring the AndroidDeadlockProtector. When QAndroidPlatformOpenGLWindow::eglSurface() already acquired the AndroidDeadlockProtector we abort the current A11y call with an emtpy or default value. Note: b8a95275440b8a143ee648466fd8b5401ee1e839 already tried to fix this by checking "getSurfaceCount() != 0", but there are situations, where a new surface is being created while an old surface is still present. Task-number: QTBUG-105958 Pick-to: 6.5 6.4 6.3 6.2 5.15 Change-Id: Ie40e8654c99aace9e69b0b8412952fa22c89f071 Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>