Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-61356

[REG 5.8->5.9]: Calling delete on a JavaScript object property results in crash

    XMLWordPrintable

    Details

      Description

      This started happening after upgrading from Qt 5.8 to Qt 5.9.0 on Arch Linux.

       

      I have tons of JavaScript objects which are "stripped" before I pass them to a C++ JSON generator. Stripped means that some properties are not wanted in the json produced (Why do I even use JavaScript to strip the object and don't do it in C++ ?  Because manipulating stupid const QJsonObjects on C++ side is madness.)

       

       

      My code looks like this:

      stripList.forEach(function(item) {
          var object = item.entity;
          var property = item.property;
      
          // Some additional filter logic...
      
          // It happens here. Without it everything is good.
          delete object[item.property] // <- Crash here, after hundreds of calls, randomly
      });
      

      I couldn't find any pattern behind the crash, it's a different property each time (I printed them) and I also measured with a counter and it crashes at 300+ or 400+ iterations, etc.

       

      This is a really big deal for me... The only workaround is to have inflated json files. The stacktrace is probably totally useless, because I don't have debug symbols. But it's the same with each crash. It does not happen with previous versions of Qt.

       

      1   ??                                                                                                                  0x7ffff63a309f
      2   QV4::MemoryManager::mark()                                                                                          0x7ffff6282fe3
      3   ??                                                                                                                  0x7ffff628362c
      4   QV4::MemoryManager::allocString(unsigned long)                                                                      0x7ffff62850d8
      5   QV4::ExecutionEngine::newString(QString const&)                                                                     0x7ffff636301a
      6   ??                                                                                                                  0x7ffff63ac0ed
      7   QV4::Runtime::method_callProperty(QV4::ExecutionEngine *, int, QV4::CallData *)                                     0x7ffff6401b0e
      8   ??                                                                                                                  0x7ffff63f8e3d
      9   ??                                                                                                                  0x7ffff63f98b5
      10  QV4::ExecutionContext::call(QV4::Scope&, QV4::CallData *, QV4::Function *, QV4::FunctionObject const *)             0x7ffff637230c
      11  ??                                                                                                                  0x7ffff6397635
      12  QV4::Runtime::method_callActivationProperty(QV4::ExecutionEngine *, int, QV4::CallData *)                           0x7ffff63fe10f
      13  ??                                                                                                                  0x7ffff63f8cf9
      14  ??                                                                                                                  0x7ffff63f98b5
      15  QV4::ExecutionContext::call(QV4::Scope&, QV4::CallData *, QV4::Function *, QV4::FunctionObject const *)             0x7ffff637230c
      16  ??                                                                                                                  0x7ffff6397635
      17  QV4::Runtime::method_callActivationProperty(QV4::ExecutionEngine *, int, QV4::CallData *)                           0x7ffff63fe10f
      18  ??                                                                                                                  0x7ffff63f8cf9
      19  ??                                                                                                                  0x7ffff63f98b5
      20  QV4::ExecutionContext::call(QV4::Scope&, QV4::CallData *, QV4::Function *, QV4::FunctionObject const *)             0x7ffff637230c
      21  ??                                                                                                                  0x7ffff6397635
      22  QV4::Runtime::method_callActivationProperty(QV4::ExecutionEngine *, int, QV4::CallData *)                           0x7ffff63fe10f
      23  ??                                                                                                                  0x7ffff63f8cf9
      24  ??                                                                                                                  0x7ffff63f98b5
      25  QV4::ExecutionContext::call(QV4::Scope&, QV4::CallData *, QV4::Function *, QV4::FunctionObject const *)             0x7ffff637230c
      26  ??                                                                                                                  0x7ffff6397635
      27  QV4::Runtime::method_callActivationProperty(QV4::ExecutionEngine *, int, QV4::CallData *)                           0x7ffff63fe10f
      28  ??                                                                                                                  0x7ffff63f8cf9
      29  ??                                                                                                                  0x7ffff63f98b5
      30  QV4::ExecutionContext::call(QV4::Scope&, QV4::CallData *, QV4::Function *, QV4::FunctionObject const *)             0x7ffff637230c
      31  ??                                                                                                                  0x7ffff6397635
      32  QV4::Runtime::method_callActivationProperty(QV4::ExecutionEngine *, int, QV4::CallData *)                           0x7ffff63fe10f
      33  ??                                                                                                                  0x7ffff63f8cf9
      34  ??                                                                                                                  0x7ffff63f98b5
      35  QV4::ExecutionContext::call(QV4::Scope&, QV4::CallData *, QV4::Function *, QV4::FunctionObject const *)             0x7ffff637230c
      36  ??                                                                                                                  0x7ffff6397635
      37  QV4::Runtime::method_callActivationProperty(QV4::ExecutionEngine *, int, QV4::CallData *)                           0x7ffff63fe10f
      38  ??                                                                                                                  0x7ffff63f8cf9
      39  ??                                                                                                                  0x7ffff63f98b5
      40  QV4::ExecutionContext::call(QV4::Scope&, QV4::CallData *, QV4::Function *, QV4::FunctionObject const *)             0x7ffff637230c
      41  ??                                                                                                                  0x7ffff6397635
      42  QV4::Runtime::method_callProperty(QV4::ExecutionEngine *, int, QV4::CallData *)                                     0x7ffff6401b0e
      43  ??                                                                                                                  0x7ffff63f8e3d
      44  ??                                                                                                                  0x7ffff63f98b5
      45  QV4::ExecutionContext::call(QV4::Scope&, QV4::CallData *, QV4::Function *, QV4::FunctionObject const *)             0x7ffff637230c
      46  ??                                                                                                                  0x7ffff6397635
      47  QV4::Runtime::method_callProperty(QV4::ExecutionEngine *, int, QV4::CallData *)                                     0x7ffff6401b0e
      48  ??                                                                                                                  0x7ffff63f8e3d
      49  ??                                                                                                                  0x7ffff63f98b5
      50  QV4::ExecutionContext::call(QV4::Scope&, QV4::CallData *, QV4::Function *, QV4::FunctionObject const *)             0x7ffff637230c
      51  ??                                                                                                                  0x7ffff6397635
      52  QV4::Runtime::method_callActivationProperty(QV4::ExecutionEngine *, int, QV4::CallData *)                           0x7ffff63fe10f
      53  ??                                                                                                                  0x7ffff63f8cf9
      54  ??                                                                                                                  0x7ffff63f98b5
      55  QV4::ExecutionContext::call(QV4::Scope&, QV4::CallData *, QV4::Function *, QV4::FunctionObject const *)             0x7ffff637230c
      56  ??                                                                                                                  0x7ffff6397635
      57  QV4::Runtime::method_callProperty(QV4::ExecutionEngine *, int, QV4::CallData *)                                     0x7ffff6401b0e
      58  ??                                                                                                                  0x7ffff63f8e3d
      59  ??                                                                                                                  0x7ffff63f98b5
      60  QV4::ExecutionContext::call(QV4::Scope&, QV4::CallData *, QV4::Function *, QV4::FunctionObject const *)             0x7ffff637230c
      61  ??                                                                                                                  0x7ffff6397635
      62  QV4::Runtime::method_callActivationProperty(QV4::ExecutionEngine *, int, QV4::CallData *)                           0x7ffff63fe10f
      63  ??                                                                                                                  0x7ffff63f8cf9
      64  ??                                                                                                                  0x7ffff63f98b5
      65  QV4::ExecutionContext::call(QV4::Scope&, QV4::CallData *, QV4::Function *, QV4::FunctionObject const *)             0x7ffff637230c
      66  QQmlJavaScriptExpression::evaluate(QV4::CallData *, bool *, QV4::Scope&)                                            0x7ffff6494fce
      67  QQmlBoundSignalExpression::evaluate(void * *)                                                                       0x7ffff642e79e
      68  ??                                                                                                                  0x7ffff642fdfb
      69  QQmlNotifier::emitNotify(QQmlNotifierEndpoint *, void * *)                                                          0x7ffff6472a83
      70  QQmlData::signalEmitted(QAbstractDeclarativeData *, QObject *, int, void * *)                                       0x7ffff6411499
      71  QMetaObject::activate(QObject *, int, int, void * *)                                                                0x7ffff55a2c9f
      72  QQmlVMEMetaObject::metaCall(QObject *, QMetaObject::Call, int, void * *)                                            0x7ffff640d9a1
      73  QQmlVMEMetaObject::metaCall(QObject *, QMetaObject::Call, int, void * *)                                            0x7ffff640c9f9
      74  ??                                                                                                                  0x7ffff6468a39
      75  ??                                                                                                                  0x7ffff63e704b
      76  ??                                                                                                                  0x7ffff63e88b2
      77  QV4::QObjectMethod::callInternal(QV4::CallData *, QV4::Scope&) const                                                0x7ffff63e95d9
      78  QV4::Runtime::method_callProperty(QV4::ExecutionEngine *, int, QV4::CallData *)                                     0x7ffff6401b0e
      79  ??                                                                                                                  0x7ffff63f8e3d
      80  ??                                                                                                                  0x7ffff63f98b5
      81  QV4::ExecutionContext::call(QV4::Scope&, QV4::CallData *, QV4::Function *, QV4::FunctionObject const *)             0x7ffff637230c
      82  QQmlJavaScriptExpression::evaluate(QV4::CallData *, bool *, QV4::Scope&)                                            0x7ffff6494fce
      83  QQmlBoundSignalExpression::evaluate(void * *)                                                                       0x7ffff642e79e
      84  ??                                                                                                                  0x7ffff642fdfb
      85  QQmlNotifier::emitNotify(QQmlNotifierEndpoint *, void * *)                                                          0x7ffff6472a83
      86  QQmlData::signalEmitted(QAbstractDeclarativeData *, QObject *, int, void * *)                                       0x7ffff6411499
      87  QMetaObject::activate(QObject *, int, int, void * *)                                                                0x7ffff55a2c9f
      88  ??                                                                                                                  0x7fffd59703af
      89  ??                                                                                                                  0x7fffd597099c
      90  ??                                                                                                                  0x7fffd5970e05
      91  ??                                                                                                                  0x7ffff6468a39
      92  ??                                                                                                                  0x7ffff63e6b29
      93  ??                                                                                                                  0x7ffff63e88ee
      94  QV4::QObjectMethod::callInternal(QV4::CallData *, QV4::Scope&) const                                                0x7ffff63e9961
      95  QV4::Runtime::method_callProperty(QV4::ExecutionEngine *, int, QV4::CallData *)                                     0x7ffff6401b0e
      96  ??                                                                                                                  0x7ffff63f8e3d
      97  ??                                                                                                                  0x7ffff63f98b5
      98  QV4::ExecutionContext::call(QV4::Scope&, QV4::CallData *, QV4::Function *, QV4::FunctionObject const *)             0x7ffff637230c
      99  QQmlJavaScriptExpression::evaluate(QV4::CallData *, bool *, QV4::Scope&)                                            0x7ffff6494fce
      100 QQmlBoundSignalExpression::evaluate(void * *)                                                                       0x7ffff642e79e
      101 ??                                                                                                                  0x7ffff642fdfb
      102 QQmlNotifier::emitNotify(QQmlNotifierEndpoint *, void * *)                                                          0x7ffff6472a83
      103 QQmlData::signalEmitted(QAbstractDeclarativeData *, QObject *, int, void * *)                                       0x7ffff6411499
      104 QMetaObject::activate(QObject *, int, int, void * *)                                                                0x7ffff55a2c9f
      105 QQuickMouseArea::released(QQuickMouseEvent *)                                                                       0x7ffff79fc482
      106 QQuickMouseArea::setPressed(Qt::MouseButton, bool, Qt::MouseEventSource)                                            0x7ffff79fdc4c
      107 QQuickMouseArea::mouseReleaseEvent(QMouseEvent *)                                                                   0x7ffff79fedba
      108 QQuickItem::event(QEvent *)                                                                                         0x7ffff7975018
      109 QApplicationPrivate::notify_helper(QObject *, QEvent *)                                                             0x7ffff709546c
      110 QApplication::notify(QObject *, QEvent *)                                                                           0x7ffff709ccf4
      111 QCoreApplication::notifyInternal2(QObject *, QEvent *)                                                              0x7ffff5574b98
      112 QQuickWindow::sendEvent(QQuickItem *, QEvent *)                                                                     0x7ffff79864f0
      113 QQuickWindowPrivate::deliverMouseEvent(QQuickPointerMouseEvent *)                                                   0x7ffff798af38
      114 QQuickWindowPrivate::deliverPointerEvent(QQuickPointerEvent *)                                                      0x7ffff798b895
      115 QQuickWindowPrivate::handleMouseEvent(QMouseEvent *)                                                                0x7ffff798c0b6
      116 QWindow::event(QEvent *)                                                                                            0x7ffff68df985
      117 QQuickWindow::event(QEvent *)                                                                                       0x7ffff798da75
      118 QApplicationPrivate::notify_helper(QObject *, QEvent *)                                                             0x7ffff709546c
      119 QApplication::notify(QObject *, QEvent *)                                                                           0x7ffff709ccf4
      120 QCoreApplication::notifyInternal2(QObject *, QEvent *)                                                              0x7ffff5574b98
      121 QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent *)                              0x7ffff68d3a93
      122 QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent *)                0x7ffff68d5575
      123 QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>)                               0x7ffff68adc0b
      124 ??                                                                                                                  0x7fffed5e01b0
      125 g_main_context_dispatch                                                                                             0x7ffff20a87b7
      126 ??                                                                                                                  0x7ffff20a8a20
      127 g_main_context_iteration                                                                                            0x7ffff20a8acc
      128 QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)                                          0x7ffff55cce7f
      129 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)                                                             0x7ffff557321a
      130 QCoreApplication::exec()                                                                                            0x7ffff557ba74
      131 main                                                                                                    main.cpp 93 0x4052f1       
      
      

       

       

       

       

        Attachments

        No reviews matched the request. Check your Options in the drop-down menu of this sections header.

          Activity

            People

            Assignee:
            shausman Simon Hausmann
            Reporter:
            supaiku_ Joshua Noack
            Votes:
            4 Vote for this issue
            Watchers:
            15 Start watching this issue

              Dates

              Created:
              Updated:
              Resolved:

                Gerrit Reviews

                There are no open Gerrit changes