Details
-
Bug
-
Resolution: Unresolved
-
P1: Critical
-
None
-
5.15.2
-
None
-
Linux/X11
Description
I added a 3D model preview function to my application that is built on top of Qt3D. When user hovers their mouse over an .obj file entry in a separate piece of GUI I load that file for preview using Qt3DRender::QSceneLoader. That is when I found this bug - if we change loader's "source" property too quickly our application crashes.
Probably, the crash happens when we change the loader's source before it has time to finish loading the previous model.
I reproduced this bug in a separate tiny application attached below.
The test app uses a QML Timer object to switch a SceneLoader's source between two paths to .obj files embedded into the app's resources. It works fine if the timer's "interval" property is big enough (say 300 milliseconds), but crashes when the interval is small. Set it to 1 ms to guarantee an instant crash.
Here is stacktrace of the crash:
Qt3DCore::QNodePrivate::get(Qt3DCore::QNode*) 0x00007f425fcc1b60 Qt3DRender::Render::OpenGL::Renderer::sendShaderChangesToFrontend(Qt3DCore::QAspectManager*) 0x00007f424f4bc183 Qt3DRender::Render::GenericLambdaJobAndPostFramePrivate<std::function<void ()>, std::function<void (Qt3DCore::QAspectManager*)> >::postFrame(Qt3DCore::QAspectManager*) 0x00007f424f4c692f Qt3DCore::QScheduler::scheduleAndWaitForFrameAspectJobs(long long, bool) 0x00007f425fca94d9 Qt3DCore::QAspectManager::processFrame() 0x00007f425fcb9dba QtPrivate::QFunctorSlotObject<Qt3DCore::QAspectManager::enterSimulationLoop()::{lambda()#1}, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void*, bool) 0x00007f425fcb9e99 void doActivate<false>(QObject*, int, void**) 0x00007f425ea79e80 QAbstractAnimation::stop() 0x00007f425e83d2af QUnifiedTimer::updateAnimationTimers(long long) 0x00007f425e83d6be QAnimationDriver::advanceAnimation(long long) 0x00007f425e83e2cc QObject::event(QEvent*) 0x00007f425ea70cab QCoreApplication::notifyInternal2(QObject*, QEvent*) 0x00007f425ea418f8 QTimerInfoList::activateTimers() 0x00007f425ea9c5d9 idleTimerSourceDispatch(_GSource*, int (void*), void*) 0x00007f425ea9cde9 g_main_context_dispatch 0x00007f425b78ef2e <unknown> 0x00007f425b78f1c8 g_main_context_iteration 0x00007f425b78f25c QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) 0x00007f425ea9d11c QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) 0x00007f425ea4030a QCoreApplication::exec() 0x00007f425ea492b3 main main.cpp:11 __libc_start_main 0x00007f425e2a409b _start 0x0000564dcb1eb1ba
Thank you for your time!