Details
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Bug
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Resolution: Unresolved
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P1: Critical
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None
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6.6.3, 6.7.1
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None
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Windows 11 Pro, Qt 6.7.1 MSVC 2019 64bit
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Windows
Description
There is an issue where qmlAttachedPropertiesObject<QQuickAccessibleAttached>
may consistently return nullptr.
When debugging textedit_bug.zip
in Qt 6.7.1, within the
QQuickTextEditPrivate::accessibilityActiveChanged
function, the accessibleAttached variable is found to be nullptr.
The function
template<typename T> QObject *qmlAttachedPropertiesObject(const QObject *obj, bool create = true)
is initially called from QtWebEngine, causing the const static variable func to be nullptr because the QML engine is not initialized.
backtrace is:
1 qmlAttachedPropertiesObject<QQuickAccessibleAttached> qqml.h 670 0x7ffbca64fa4a 2 QQuickAccessibleAttached::attachedProperties qquickaccessibleattached_p.h 118 0x7ffbca650fc6 3 QQuickAccessibleAttached::findAccessible qquickaccessibleattached_p.h 142 0x7ffbca651c70 4 QQuickItem::geometryChange qquickitem.cpp 3896 0x7ffbca6cd2c8 5 QtWebEngineCore::RenderWidgetHostViewQtDelegateItem::geometryChange render_widget_host_view_qt_delegate_item.cpp 313 0x7ffb5d298e28 6 QQuickItem::setSize qquickitem.cpp 7685 0x7ffbca6c5e59 7 QtWebEngineCore::RenderWidgetHostViewQtDelegateItem::resize render_widget_host_view_qt_delegate_item.cpp 135 0x7ffb5d29ae08 8 QtWebEngineCore::RenderWidgetHostViewQt::SetSize render_widget_host_view_qt.cpp 274 0x7ffb5d274bf1 9 content::WebContentsImpl::CreateRenderWidgetHostViewForRenderManager web_contents_impl.cc 8635 0x7ffb6974ec50 10 content::WebContentsImpl::CreateRenderViewForRenderManager web_contents_impl.cc 8657 0x7ffb6974e5b4 11 QtWebEngineCore::WebContentsAdapter::initialize web_contents_adapter.cpp 512 0x7ffb5d338bf2 12 QtWebEngineCore::WebContentsAdapter::load web_contents_adapter.cpp 643 0x7ffb5d33a625 13 QtWebEngineCore::WebContentsAdapter::load web_contents_adapter.cpp 633 0x7ffb5d33a529 14 QWebEnginePage::load qwebenginepage.cpp 1880 0x7ffb5cfdef93 15 QWebEnginePage::setUrl qwebenginepage.cpp 1935 0x7ffb5cfdf3f8 16 QWebEngineView::setUrl qwebengineview.cpp 1104 0x7ffc11338bce 17 main main.cpp 13 0x7ff7ff162bdf 18 qtEntryPoint qtentrypoint_win.cpp 50 0x7ff7ff167477 19 WinMain qtentrypoint_win.cpp 60 0x7ff7ff16727e 20 invoke_main exe_common.inl 107 0x7ff7ff165382 ...
I think this behavior is likely related to the change in QWebEngineView::load to synchronous processing.
In Qt 6.5.5, qmlAttachedPropertiesObject<QQuickAccessibleAttached> returns a valid pointer.
In Qt 6.6.3 and Qt 6.7.0, this leads to a crash due to null pointer dereference. The following commits are related:
- https://codereview.qt-project.org/c/qt/qtdeclarative/+/513599
- https://codereview.qt-project.org/c/qt/qtdeclarative/+/551356