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  1. Qt
  2. QTBUG-127065

Memory leak in Loader during debugging via QML debugger

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    • Linux/X11, Linux/Yocto
    • d978f34dc (dev)

      During debugging of an application created using QML, which includes the Loader component, compiled in a debugging configuration in the QML object tree, ScreenInfo objects are accumulated in the program window object. After a critical memory consumption value, Qt creator crashes with the message malloc_consolidate(): invalid chunk size

      Below is the code of a minimal program to reproduce the problem

      import QtQuick 2.15
import QtQuick.Window 2.15

Window {
    id: page
    width: 640
    height: 480
    visible: true
    
    Loader {
        anchors.fill: parent
        id: loader
    }
    
    Component {
        id: c1
        
        Rectangle {
            color: "red"
        }
    }
    
    Component {
        id: c2
        
        Rectangle {
            color: "green"
        }
    }
    
    Timer {
        property bool c: false
        interval: 500
        running: true
        repeat: true
        onTriggered: {
        if (c) {
            loader.sourceComponent = c1
        }
        else {
            loader.sourceComponent = c2
        }
        c = !c
        }
    }
}

       

      Playback steps
      1. Build the project in a debug configuration
      2. Run the project in debug mode
      3. Switch to QML debugger mode
      4. Pay attention to the tree of QML objects, new ScreenInfo objects will appear in the page object, the amount of memory consumed will increase.

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            diseraluca Luca Di Sera
            m.lyubimov Maxim Lyubimov
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              Created:
              Updated:
              Resolved:

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