<![CDATA[Application crashes with Qt 5.14/5.13 but runs correclty with 5.5]]>Hi, I have an issue with my project when I compile it with Qt 5.13.x or 5.14.x versions, it crashes immediatly after startup without a clear stack trace.
If I compile the code with Qt 5.5, it runs correclty without any issues. I don't have any warning about deprecated code or anything, the code itself is well tested and mantained, I was testing the upgrade to a newer Qt version.

I'm compiling on a ZBook 15 G5 on Ubuntu 22.04 (X11 with Nvidia Quadro P2000 GPU), plenty of RAM and performance available.

The stack trace is the following:

1  QObject::objectName() const                                                                              0x7ffff40bf110 
2  QQmlEngineDebugServiceImpl::valueContents(QVariant) const                                                0x7fffcf40f42d 
3  QQmlEngineDebugServiceImpl::propertyChanged(int, int, QMetaProperty const&, QVariant const&)             0x7fffcf411ea0 
4  void doActivate<false>(QObject *, int, void * *)                                                         0x7ffff40ca5f0 
5  QQmlWatchProxy::notifyValueChanged()                                                                     0x7fffcf4147e3 
6  QQmlWatcher::addPropertyWatch(int, QObject *, unsigned int, QMetaProperty const&)                        0x7fffcf414f79 
7  QQmlWatcher::addWatch(int, unsigned int)                                                                 0x7fffcf4150ef 
8  QQmlEngineDebugServiceImpl::processMessage(QByteArray const&)                                            0x7fffcf411454 
9  QObject::event(QEvent *)                                                                                 0x7ffff40c2c13 
10 QCoreApplication::notifyInternal2(QObject *, QEvent *)                                                   0x7ffff4093c48 
11 QCoreApplicationPrivate::sendPostedEvents(QObject *, int, QThreadData *)                                 0x7ffff40971da 
12 postEventSourceDispatch(_GSource *, int ( *)(void *), void *)                                            0x7ffff40ed0a3 
13 g_main_context_dispatch                                                                                  0x7fffef31bd1b 
14 ??                                                                                                       0x7fffef3706f8 
15 g_main_context_iteration                                                                                 0x7fffef3193c3 
16 QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)                               0x7ffff40ec73c 
17 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)                                                  0x7ffff4092662 
18 QCoreApplication::exec()                                                                                 0x7ffff409b590 
19 main                                                                                         main.cpp 56 0x55555555c318

EDIT I've found a totally different stack trace with the same crash at startup, this seems more "related" to Gstreamer and QML

                                                                                                                                  
                                                                                                                                  
1  ??                                                                                                              0x7fff5cde458f 
2  ??                                                                                                              0x7fff5cdd8ec5 
3  ??                                                                                                              0x7fff5cdbe19b 
4  ??                                                                                                              0x7fff5d095a6c 
5  ??                                                                                                              0x7fff5cf860c9 
6  vaPutImage                                                                                                      0x7fffa569b4b0 
7  ??                                                                                                              0x7fffa498ab23 
8  ??                                                                                                              0x7fffa494a1a9 
9  ??                                                                                                              0x7fffa4958e70 
10 ??                                                                                                              0x7fffc07b1056 
11 gst_element_change_state                                                                                        0x7fffc0070649 
12 ??                                                                                                              0x7fffc0070d55 
13 QGstreamerVideoOverlay::QGstreamerVideoOverlay(QObject *, QByteArray const&)                                    0x7fff5dc30864 
14 QGstreamerVideoWidgetControl::QGstreamerVideoWidgetControl(QObject *, QByteArray const&)                        0x7fff5dc3d410 
15 QGstreamerPlayerService::QGstreamerPlayerService(QObject *)                                                     0x7fff5e004bb1 
16 QGstreamerPlayerServicePlugin::create(QString const&)                                                           0x7fff5e00e6df 
17 QPluginServiceProvider::requestService(QByteArray const&, QMediaServiceProviderHint const&)                     0x7ffff1458401 
18 QMediaPlayer::QMediaPlayer(QObject *, QFlags<QMediaPlayer::Flag>)                                               0x7ffff149b212 
19 QDeclarativeAudio::classBegin()                                                                                 0x7fff5f81faea 
20 QQmlObjectCreator::createInstance(int, QObject *, bool)                                                         0x7ffff3eef8c8 
21 QQmlObjectCreator::setPropertyBinding(QQmlPropertyData const *, QV4::CompiledData::Binding const *)             0x7ffff3ef1fe6 
22 QQmlObjectCreator::setupBindings(bool)                                                                          0x7ffff3ef2543 
23 QQmlObjectCreator::populateInstance(int, QObject *, QObject *, QQmlPropertyData const *)                        0x7ffff3eeed5d 
24 QQmlObjectCreator::createInstance(int, QObject *, bool)                                                         0x7ffff3eefd7d 
25 QQmlObjectCreator::create(int, QObject *, QQmlInstantiationInterrupt *, int)                                    0x7ffff3ef2f56 
26 QQmlObjectCreator::createInstance(int, QObject *, bool)                                                         0x7ffff3ef0189 
27 QQmlObjectCreator::setPropertyBinding(QQmlPropertyData const *, QV4::CompiledData::Binding const *)             0x7ffff3ef1fe6 
28 QQmlObjectCreator::setupBindings(bool)                                                                          0x7ffff3ef2543 
29 QQmlObjectCreator::populateInstance(int, QObject *, QObject *, QQmlPropertyData const *)                        0x7ffff3eeed5d 
30 QQmlObjectCreator::createInstance(int, QObject *, bool)                                                         0x7ffff3eefd7d 
31 QQmlObjectCreator::create(int, QObject *, QQmlInstantiationInterrupt *, int)                                    0x7ffff3ef2f56 
32 QQmlObjectCreator::createInstance(int, QObject *, bool)                                                         0x7ffff3ef0189 
33 QQmlObjectCreator::setPropertyBinding(QQmlPropertyData const *, QV4::CompiledData::Binding const *)             0x7ffff3ef1fe6 
34 QQmlObjectCreator::setupBindings(bool)                                                                          0x7ffff3ef2543 
35 QQmlObjectCreator::populateInstance(int, QObject *, QObject *, QQmlPropertyData const *)                        0x7ffff3eeed5d 
36 QQmlObjectCreator::createInstance(int, QObject *, bool)                                                         0x7ffff3eefd7d 
37 QQmlObjectCreator::setPropertyBinding(QQmlPropertyData const *, QV4::CompiledData::Binding const *)             0x7ffff3ef1fe6 
38 QQmlObjectCreator::setupBindings(bool)                                                                          0x7ffff3ef2543 
39 QQmlObjectCreator::populateInstance(int, QObject *, QObject *, QQmlPropertyData const *)                        0x7ffff3eeed5d 
40 QQmlObjectCreator::createInstance(int, QObject *, bool)                                                         0x7ffff3eefd7d 
41 QQmlObjectCreator::create(int, QObject *, QQmlInstantiationInterrupt *, int)                                    0x7ffff3ef2f56 
42 QQmlIncubatorPrivate::incubate(QQmlInstantiationInterrupt&)                                                     0x7ffff3e7ade6 
43 QQmlEnginePrivate::incubate(QQmlIncubator&, QQmlContextData *)                                                  0x7ffff3e7b904 
44 QQmlComponent::create(QQmlIncubator&, QQmlContext *, QQmlContext *)                                             0x7ffff3e749ad 
45 QQuickLoaderPrivate::_q_sourceLoaded()                                                                          0x7ffff1ab9ff9 
46 QQuickLoader::qt_static_metacall(QObject *, QMetaObject::Call, int, void * *)                                   0x7ffff1abaff9 
47 void doActivate<false>(QObject *, int, void * *)                                                                0x7ffff36d5ddf 
48 QQmlComponent::statusChanged(QQmlComponent::Status)                                                             0x7ffff3e73abe 
49 QQmlComponentPrivate::typeDataReady(QQmlTypeData *)                                                             0x7ffff3e75f6a 
50 QQmlTypeData::completed()                                                                                       0x7ffff3e50051 
51 QQmlTypeLoaderThread::callCompletedMain(QQmlDataBlob *)                                                         0x7ffff3e5a1fd 
52 QQmlThreadPrivate::mainEvent()                                                                                  0x7ffff3f1ac6c 
53 QQmlThreadPrivate::MainObject::event(QEvent *)                                                                  0x7ffff3f1b3fe 
54 QCoreApplication::notifyInternal2(QObject *, QEvent *)                                                          0x7ffff369d808 
55 QCoreApplicationPrivate::sendPostedEvents(QObject *, int, QThreadData *)                                        0x7ffff36a0882 
56 postEventSourceDispatch(_GSource *, int ( *)(void *), void *)                                                   0x7ffff36f9b33 
57 g_main_context_dispatch                                                                                         0x7fffee91bd1b 
58 ??                                                                                                              0x7fffee9706f8 
59 g_main_context_iteration                                                                                        0x7fffee9193c3 
60 QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)                                      0x7ffff36f91cc 
61 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)                                                         0x7ffff369c21a 
62 QCoreApplication::exec()                                                                                        0x7ffff36a51d3 
63 main                                                                                                main.cpp 83 0x55555556755a

I can't find the root cause of this, I've tried to swith to Wayland to see if it's anything related to the graphics but it doesn't matter.
Did you have had some experience with this issues?
Thanks!

]]>https://forum.qt.io/topic/137172/application-crashes-with-qt-5-14-5-13-but-runs-correclty-with-5-5RSS for NodeSun, 19 Jul 2026 02:41:50 GMTMon, 13 Jun 2022 05:50:31 GMT60<![CDATA[Reply to Application crashes with Qt 5.14/5.13 but runs correclty with 5.5 on Sun, 19 Jun 2022 12:38:02 GMT]]>@DavideG said in Application crashes with Qt 5.14/5.13 but runs correclty with 5.5:

QQmlEngineDebugServiceImpl

It looks like it chokes in the part that implements the QML/JS debugger and profiler infrastructure. If you don't need it, you can try launchign your app without -qmljsdebugger command line argument. If you launch your app from Qt Creator, you achieve this by disabling the 'QML debugging and profiling' in the build settings.

]]>https://forum.qt.io/post/718202https://forum.qt.io/post/718202Sun, 19 Jun 2022 12:38:02 GMT<![CDATA[Reply to Application crashes with Qt 5.14/5.13 but runs correclty with 5.5 on Wed, 22 Jun 2022 07:38:03 GMT]]>I'm sure I can reproduce the probem on Qt 5.15, I haven't tried on Qt 6.x also because I don't know if my code is compatible with them.
I'll give it a try and open a bug if it's the case, thanks!

]]>https://forum.qt.io/post/718544https://forum.qt.io/post/718544Wed, 22 Jun 2022 07:38:03 GMT<![CDATA[Reply to Application crashes with Qt 5.14/5.13 but runs correclty with 5.5 on Mon, 20 Jun 2022 11:11:29 GMT]]>@DavideG said in Application crashes with Qt 5.14/5.13 but runs correclty with 5.5:

Can you point me to some sort of support page to check the packages needed on my system?

There's no external dependencies for the QML engine. What you might have hit, however, is a bug in Qt itself. You can report it; but before this, you should a) check whether it is still reproducible with Qt 5.15 or Qt 6.2/6.3.

]]>https://forum.qt.io/post/718319https://forum.qt.io/post/718319Mon, 20 Jun 2022 11:11:29 GMT<![CDATA[Reply to Application crashes with Qt 5.14/5.13 but runs correclty with 5.5 on Mon, 20 Jun 2022 07:34:48 GMT]]>It worked! By disabling the QML debugger the project runs correclty! Many many thanks :) I'll put the thread as "solved" but now I'm wondering what am I missing to let QML Debugger runs correclty
Can you point me to some sort of support page to check the packages needed on my system?
Thanks again!

]]>https://forum.qt.io/post/718267https://forum.qt.io/post/718267Mon, 20 Jun 2022 07:34:48 GMT<![CDATA[Reply to Application crashes with Qt 5.14/5.13 but runs correclty with 5.5 on Sun, 19 Jun 2022 12:38:02 GMT]]>@DavideG said in Application crashes with Qt 5.14/5.13 but runs correclty with 5.5:

QQmlEngineDebugServiceImpl

It looks like it chokes in the part that implements the QML/JS debugger and profiler infrastructure. If you don't need it, you can try launchign your app without -qmljsdebugger command line argument. If you launch your app from Qt Creator, you achieve this by disabling the 'QML debugging and profiling' in the build settings.

]]>https://forum.qt.io/post/718202https://forum.qt.io/post/718202Sun, 19 Jun 2022 12:38:02 GMT<![CDATA[Reply to Application crashes with Qt 5.14/5.13 but runs correclty with 5.5 on Fri, 17 Jun 2022 15:52:12 GMT]]>@DavideG Which gstreamer version did you use With Qt 5.5? Try to use the same version of gstreamer. GStreamer Core Library version 1.20.1 is pretty new.

]]>https://forum.qt.io/post/718047https://forum.qt.io/post/718047Fri, 17 Jun 2022 15:52:12 GMT<![CDATA[Reply to Application crashes with Qt 5.14/5.13 but runs correclty with 5.5 on Fri, 17 Jun 2022 07:08:30 GMT]]>What do I need to check? I've already compiled with both 5.14 and 5.15 version, same results.
Do you think it could be helpful to see the env variable set in Build/Run env ?

]]>https://forum.qt.io/post/717978https://forum.qt.io/post/717978Fri, 17 Jun 2022 07:08:30 GMT<![CDATA[Reply to Application crashes with Qt 5.14/5.13 but runs correclty with 5.5 on Thu, 16 Jun 2022 17:51:51 GMT]]>Strange... can you check with 5.15 ?

]]>https://forum.qt.io/post/717925https://forum.qt.io/post/717925Thu, 16 Jun 2022 17:51:51 GMT<![CDATA[Reply to Application crashes with Qt 5.14/5.13 but runs correclty with 5.5 on Thu, 16 Jun 2022 14:54:44 GMT]]>Yes I don't see other version with 'update-alternatives' and with 'apt'
I've removed a couple of gstreamer0.1 packages but nothing changed

]]>https://forum.qt.io/post/717905https://forum.qt.io/post/717905Thu, 16 Jun 2022 14:54:44 GMT<![CDATA[Reply to Application crashes with Qt 5.14/5.13 but runs correclty with 5.5 on Wed, 15 Jun 2022 20:05:07 GMT]]>Do you have only one version of GStreamer installed ?

]]>https://forum.qt.io/post/717761https://forum.qt.io/post/717761Wed, 15 Jun 2022 20:05:07 GMT<![CDATA[Reply to Application crashes with Qt 5.14/5.13 but runs correclty with 5.5 on Wed, 15 Jun 2022 06:19:22 GMT]]>I've checked and it seems updated to the latest available

gst-launch-1.0 --gst-version
GStreamer Core Library version 1.20.1

Do I need to install a specific version for Qt 5.14/15 ?

]]>https://forum.qt.io/post/717627https://forum.qt.io/post/717627Wed, 15 Jun 2022 06:19:22 GMT<![CDATA[Reply to Application crashes with Qt 5.14/5.13 but runs correclty with 5.5 on Mon, 13 Jun 2022 21:01:27 GMT]]>Hi and welcome to devnet,

If memory serves well, these versions of Qt are using different versions of GStreamer. Did you check that ?

]]>https://forum.qt.io/post/717415https://forum.qt.io/post/717415Mon, 13 Jun 2022 21:01:27 GMT