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  1. Qt
  2. QTBUG-67152

Assert when using Material or Universal Style in Qt Quick Designer

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      Description

      When using the Universal or Material style in the Qt Quick Designer and dragging a Combobox into the form I get the following assert:

                                                                                                                                ucrtbased                           0x5cf5eae4 
      15 qt_message_fatal                                                                                                                               qlogging.cpp                   1828 0x6630ac87 
      16 QMessageLogger::fatal                                                                                                                          qlogging.cpp                   877  0x663098ad 
      17 qt_assert                                                                                                                                      qglobal.cpp                    3180 0x662fd87e 
      18 QQuickItemLayer::componentComplete                                                                                                             qquickitem.cpp                 8157 0xffa8899  
      19 QQuickItem::componentComplete                                                                                                                  qquickitem.cpp                 4988 0xffa69a6  
      20 QQmlObjectCreator::finalize                                                                                                                    qqmlobjectcreator.cpp          1350 0x65a4266e 
      21 QQmlComponentPrivate::complete                                                                                                                 qqmlcomponent.cpp              926  0x65998c1c 
      22 QQmlComponentPrivate::completeDeferred                                                                                                         qqmlcomponent.cpp              917  0x65998be3 
      23 QtQuickPrivate::completeDeferred                                                                                                               qquickdeferredexecute.cpp      141  0xc2b3c37  
      24 quickCompleteDeferred<QQuickItem>                                                                                                              qquickdeferredexecute_p_p.h    82   0xc2851e6  
      25 QQuickPopupItemPrivate::executeBackground                                                                                                      qquickpopupitem.cpp            152  0xc2e789f  
      26 QQuickControl::componentComplete                                                                                                               qquickcontrol.cpp              1455 0xc2af5e6  
      27 QmlDesigner::Internal::QmlPrivateGate::doComponentCompleteRecursive                                                                            qmlprivategate_56.cpp          262  0x1091c29  
      28 QmlDesigner::Internal::QmlPrivateGate::doComponentCompleteRecursive                                                                            qmlprivategate_56.cpp          257  0x1091be5  
      29 QmlDesigner::Internal::QmlPrivateGate::doComponentCompleteRecursive                                                                            qmlprivategate_56.cpp          257  0x1091be5  
      30 QmlDesigner::Internal::ObjectNodeInstance::doComponentComplete                                                                                 objectnodeinstance.cpp         928  0x106347e  
      31 QmlDesigner::Internal::QuickItemNodeInstance::doComponentComplete                                                                              quickitemnodeinstance.cpp      196  0x103e0a0  
      32 QmlDesigner::ServerNodeInstance::doComponentComplete                                                                                           servernodeinstance.cpp         595  0x106a864  
      33 QmlDesigner::NodeInstanceServer::completeComponent                                                                                             nodeinstanceserver.cpp         403  0x1045e34  
      34 QmlDesigner::NodeInstanceClientProxy::completeComponent                                                                                        nodeinstanceclientproxy.cpp    390  0x101cb15  
      35 QmlDesigner::NodeInstanceClientProxy::dispatchCommand                                                                                          nodeinstanceclientproxy.cpp    469  0x101c6c6  
      36 QmlDesigner::NodeInstanceClientProxy::readDataStream                                                                                           nodeinstanceclientproxy.cpp    309  0x101d074  
      37 QtPrivate::FunctorCall<QtPrivate::IndexesList<>,QtPrivate::List<>,void,void (__thiscall QmlDesigner::NodeInstanceClientProxy:: *)(void)>::call qobjectdefs_impl.h             134  0x102954d  
      38 QtPrivate::FunctionPointer<void (__thiscall QmlDesigner::NodeInstanceClientProxy:: *)(void)>::call<QtPrivate::List<>,void>                     qobjectdefs_impl.h             167  0x101e4e8  
      39 QtPrivate::QSlotObject<void (__thiscall QmlDesigner::NodeInstanceClientProxy:: *)(void),QtPrivate::List<>,void>::impl                          qobjectdefs_impl.h             396  0x102ae25  
      40 QtPrivate::QSlotObjectBase::call                                                                                                               qobjectdefs_impl.h             376  0x665ac86f 
      41 QMetaObject::activate                                                                                                                          qobject.cpp                    3757 0x665e02b1 
      42 QMetaObject::activate                                                                                                                          qobject.cpp                    3631 0x665dfdc1 
      43 QIODevice::readyRead                                                                                                                           moc_qiodevice.cpp              185  0x6649dc59 
      44 QIODevice::qt_static_metacall                                                                                                                  moc_qiodevice.cpp              91   0x6649b638 
      45 QMetaObject::activate                                                                                                                          qobject.cpp                    3769 0x665e038c 
      46 QMetaObject::activate                                                                                                                          qobject.cpp                    3631 0x665dfdc1 
      47 QWindowsPipeReader::readyRead                                                                                                                  moc_qwindowspipereader_p.cpp   166  0x666dafe9 
      48 QWindowsPipeReader::emitPendingReadyRead                                                                                                       qwindowspipereader.cpp         308  0x66527078 
      49 QtPrivate::FunctorCall<QtPrivate::IndexesList<>,QtPrivate::List<>,void,void (__thiscall QWindowsPipeReader:: *)(void)>::call                   qobjectdefs_impl.h             134  0x6652767a 
      50 QtPrivate::FunctionPointer<void (__thiscall QWindowsPipeReader:: *)(void)>::call<QtPrivate::List<>,void>                                       qobjectdefs_impl.h             167  0x66527384 
      51 QtPrivate::QSlotObject<void (__thiscall QWindowsPipeReader:: *)(void),QtPrivate::List<>,void>::impl                                            qobjectdefs_impl.h             396  0x665276fe 
      52 QtPrivate::QSlotObjectBase::call                                                                                                               qobjectdefs_impl.h             376  0x665ac86f 
      53 QMetaCallEvent::placeMetaCall                                                                                                                  qobject.cpp                    502  0x665e7197 
      54 QObject::event                                                                                                                                 qobject.cpp                    1250 0x665e18a6 
      55 QCoreApplicationPrivate::notify_helper                                                                                                         qcoreapplication.cpp           1198 0x665991fc 
      56 doNotify                                                                                                                                       qcoreapplication.cpp           1138 0x6659a5d3 
      57 QCoreApplication::notify                                                                                                                       qcoreapplication.cpp           1124 0x66596fa3 
      58 QGuiApplication::notify                                                                                                                        qguiapplication.cpp            1739 0x37c4028  
      59 QCoreApplication::notifyInternal2                                                                                                              qcoreapplication.cpp           1048 0x6659859c 
      60 QCoreApplication::sendEvent                                                                                                                    qcoreapplication.h             234  0x665a19f9 
      61 QCoreApplicationPrivate::sendPostedEvents                                                                                                      qcoreapplication.cpp           1745 0x66599979 
      62 QEventDispatcherWin32::sendPostedEvents                                                                                                        qeventdispatcher_win.cpp       1084 0x666340c4 
      63 QWindowsGuiEventDispatcher::sendPostedEvents                                                                                                   qwindowsguieventdispatcher.cpp 82   0x5a6e5f0  
      64 qt_internal_proc                                                                                                                               qeventdispatcher_win.cpp       239  0x666326e3 
      65 AddClipboardFormatListener                                                                                                                     USER32                              0x765be0bb 
      66 EndTask                                                                                                                                        USER32                              0x765c8849 
      67 EndTask                                                                                                                                        USER32                              0x765cb145 
      68 DispatchMessageW                                                                                                                               USER32                              0x765b90dc 
      69 DispatchMessageW                                                                                                                               USER32                              0x765b8c20 
      70 QEventDispatcherWin32::processEvents                                                                                                           qeventdispatcher_win.cpp       630  0x66632e89 
      71 QWindowsGuiEventDispatcher::processEvents                                                                                                      qwindowsguieventdispatcher.cpp 74   0x5a6e5c8  
      72 QEventLoop::processEvents                                                                                                                      qeventloop.cpp                 137  0x6659383c 
      73 QEventLoop::exec                                                                                                                               qeventloop.cpp                 214  0x66593a47 
      74 QCoreApplication::exec                                                                                                                         qcoreapplication.cpp           1336 0x66596772 
      75 QGuiApplication::exec                                                                                                                          qguiapplication.cpp            1730 0x37c3fe8  
      76 internalMain                                                                                                                                   qml2puppetmain.cpp             128  0x1093eab  
      77 main                                                                                                                                           qml2puppetmain.cpp             145  0x1093fc9  
      78 invoke_main                                                                                                                                    exe_common.inl                 64   0x1097b7e  
      79 __scrt_common_main_seh                                                                                                                         exe_common.inl                 253  0x1097a00  
      80 __scrt_common_main                                                                                                                             exe_common.inl                 296  0x109789d  
      81 mainCRTStartup                                                                                                                                 exe_main.cpp                   17   0x1097b98  
      82 BaseThreadInitThunk                                                                                                                            KERNEL32                            0x772a8654 
      83 RtlGetAppContainerNamedObjectPath                                                                                                              ntdll                               0x77964a77 
      84 RtlGetAppContainerNamedObjectPath                                                                                                              ntdll                               0x77964a47 
      

      I also get the assert with Qt 5.10.1 but not with Qt 5.10.0

      This is most likely related to deferred properties.

      With the default error everything seems to work.

      See also: QTCREATORBUG-20034 and QTCREATORBUG-20033

      https://codereview.qt-project.org/#/c/219430/ does fix the assert, but the background of the Combobox is not rendered anymore. The default style is not affected.

      Stack trace for Button which seems to assert in any style.

      16 QMessageLogger::fatal                                                                                                                          qlogging.cpp                         877  0x666c98ad 
      17 qt_assert                                                                                                                                      qglobal.cpp                          3180 0x666bd87e 
      18 QQuickItemLayer::componentComplete                                                                                                             qquickitem.cpp                       8157 0x10158899 
      19 QQuickItem::componentComplete                                                                                                                  qquickitem.cpp                       4988 0x101569a6 
      20 QQmlObjectCreator::finalize                                                                                                                    qqmlobjectcreator.cpp                1350 0x6540266e 
      21 QQmlComponentPrivate::complete                                                                                                                 qqmlcomponent.cpp                    926  0x65358c1c 
      22 QQmlComponentPrivate::completeDeferred                                                                                                         qqmlcomponent.cpp                    917  0x65358be3 
      23 QtQuickPrivate::completeDeferred                                                                                                               qquickdeferredexecute.cpp            141  0xfcf3c37  
      24 quickCompleteDeferred<QQuickItem>                                                                                                              qquickdeferredexecute_p_p.h          82   0xfcc51e6  
      25 QQuickControlPrivate::executeBackground                                                                                                        qquickcontrol.cpp                    697  0xfcf1e2b  
      26 QQuickControl::componentComplete                                                                                                               qquickcontrol.cpp                    1455 0xfcef5e6  
      27 QQuickAbstractButton::componentComplete                                                                                                        qquickabstractbutton.cpp             958  0xfcc2839  
      28 QmlDesigner::Internal::QmlPrivateGate::doComponentCompleteRecursive                                                                            qmlprivategate_56.cpp                262  0xc01c29   
      29 QmlDesigner::Internal::ObjectNodeInstance::doComponentComplete                                                                                 objectnodeinstance.cpp               928  0xbd347e   
      30 QmlDesigner::Internal::QuickItemNodeInstance::doComponentComplete                                                                              quickitemnodeinstance.cpp            196  0xbae0a0   
      31 QmlDesigner::ServerNodeInstance::doComponentComplete                                                                                           servernodeinstance.cpp               595  0xbda864   
      32 QmlDesigner::NodeInstanceServer::completeComponent                                                                                             nodeinstanceserver.cpp               403  0xbb5e34   
      33 QmlDesigner::Qt5InformationNodeInstanceServer::completeComponent                                                                               qt5informationnodeinstanceserver.cpp 268  0xba74e4   
      34 QmlDesigner::NodeInstanceClientProxy::completeComponent                                                                                        nodeinstanceclientproxy.cpp          390  0xb8cb15   
      35 QmlDesigner::NodeInstanceClientProxy::dispatchCommand                                                                                          nodeinstanceclientproxy.cpp     
      

      https://codereview.qt-project.org/#/c/223764/ ensures that the qml2puppet does not read deferred properties before completing the qobject. This is not enough to fix the issue.

      But together with https://codereview.qt-project.org/#/c/224070/ the issue seems to be fixed.

      The patch https://codereview.qt-project.org/#/c/224070 is required because when finalizing the component creating certain bindings are evaluated that trigger quickBeginDeferred().
      To ensure defined behavior we have to avoid calling quickBeginDeferred() while component complete is blocked.

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        # Subject Branch Project Status CR V

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            • Assignee:
              thohartm Thomas Hartmann
              Reporter:
              thohartm Thomas Hartmann
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