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  1. Qt
  2. QTBUG-97496

Crash in QV4::QObjectSlotDispatcher aka Loader does not disconnect signals

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    Description

      Application will crash when signal is delivered to already deleted Item that was loaded through Loader.

      Example stack:

      ...
    frame #6: 0x00000001099d051f isllight`QV4::ArrowFunction::virtualCall(QV4::FunctionObject const*, QV4::Value const*, QV4::Value const*, int) + 367
    frame #7: 0x0000000109a0f1be isllight`QV4::QObjectSlotDispatcher::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) + 718
    frame #8: 0x0000000108f56102 isllight`void doActivate<false>(QObject*, int, void**) + 1138
    frame #9: 0x00000001090d07cf isllight`QGuiApplicationPrivate::processActivatedEvent(QWindowSystemInterfacePrivate::ActivatedWindowEvent*) + 927
    frame #10: 0x00000001090b7ee3 isllight`bool QWindowSystemInterfacePrivate::handleWindowSystemEvent<QWindowSystemInterface::SynchronousDelivery>(QWindowSystemInterfacePrivate::WindowSystemEvent*) + 115
    frame #11: 0x000000010985f63e isllight`QCocoaWindow::windowDidBecomeKey() + 238
...
    frame #13: 0x0000000109862dc1 isllight`___ZL30qRegisterNotificationCallbacksv_block_invoke + 2529
...
    frame #22: 0x00007fff2eb550ec AppKit`-[NSWindow becomeKeyWindow] + 1117

      Sample app - shows wrong behavior but does not crash: qt_bug_connect_crash.qml. There should be no CRASH string in console log.

      To reproduce application coredump connect qApp signal to a component initialized through QML Loader, switch source with QQuickView::setSource and issue the qApp signal.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-65169 Crash when using connect() (presumably from dynamic created item in a Loader)

          • 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.
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              qtqmlteam Qt Qml Team User
              gasper Gašper Lah
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                Created:
                Updated:
                Resolved:

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