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  1. Qt
  2. QTBUG-76923

[regression 5.12.3 - > 5.12.4] crash in qwidgetbackingstore (qt_scrollarea_viewport) in QListView

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    • deac052a40c93633041da058d5c73c9e91aa76c7

    Description

      Qt crashes if a QListView (or QListWidget) is scrolled when the containing window (QWidget) is opened another time. Opening the containing QWidget the first time scrolling a QListView (or QListWidget) works fine.

      Crash in class: QWidgetBackingStore
      function: markDirtyOnScreen(const QRegion &region, QWidget *widget, const QPoint &topLevelOffset)
      line: 727

      from QWidgetBackingStore.cpp

              QWidget *nativeParent = widget->nativeParentWidget();        // Alien widgets with the top-level as the native parent (common case).
        if (nativeParent == tlw) {
            if (!widget->testAttribute(Qt::WA_WState_InPaintEvent))
                dirtyOnScreen += region.translated(topLevelOffset);
            return;
        }        

        // Alien widgets with native parent != tlw.
        QWidgetPrivate *nativeParentPrivate = nativeParent->d_func();

      nativeParent seems to be null.

       

      from QWidget (nativeParentWidget might return 0):

      QWidget *QWidget::nativeParentWidget() const
{
    QWidget *parent = parentWidget();
    while (parent && !parent->internalWinId())
        parent = parent->parentWidget();
    return parent;
}
      /*! 
    \fn QWidget *QWidget::parentWidget() const 

    Returns the parent of this widget, or 0 if it does not have any parent 
    widget. 
*/

       

      steps to reproduce with attached example (scrollview-example.zip)
      (tested on macos, windows):

      1) run the project with Qt 5.12.4
      2) click on "Open Window"
      3) in the new window press button "add" multiple times until the listview scrolls
      4) verify scrolling works fine
      5) close the window
      6) press button "Open Window"
      7) try to scroll -> crash

       

      Attachments

        1. backtrace.rtf
          54 kB
        2. scrollview-example.zip
          4 kB
        3. stack.tasks
          4 kB

        Issue Links

          duplicates

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-76661 Segmentation Fault When Scrolling Window Contents

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTCREATORBUG-22735 Crashes when moving mouse wheel after few tries

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-76661 Segmentation Fault When Scrolling Window Contents

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTCREATORBUG-22688 Crash when opening help and scroll before loading is finished

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed
          replaces

          Bug - A problem which impairs or prevents the functions of the product. QTCREATORBUG-22767 Sudden crash in QWidget::mapTo

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTCREATORBUG-22816 Crash in locator bar

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed
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              qt.team.quick.subscriptions Qt Quick and Widgets Team
              i.n.g.o. Ingo Randolf
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              Dates

                Created:
                Updated:
                Resolved:

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