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  1. Qt
  2. QTBUG-136948

Access violation in QQuickTextControlPrivate::inputMethodEvent

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    • Windows

    Description

      Observing this when analyzing our users' crashes in Sentry. It's never reproduced in our testing environment, so I have no idea about preconditions/steps.

      Unhandled exception at 0x00007FF937ACC296 (Qt6Gui.dll) in 6bfa48f6-948c-4952-b1e4-1428bb68096f.dmp: 0xC0000005: Access violation reading location 0x0000000000000000.

      Call stack:

       	[Inline Frame] Qt6Gui.dll!QTextEngine::preeditAreaText() Line 566	C++
>	Qt6Gui.dll!QTextLayout::preeditAreaText() Line 492	C++
 	Qt6Quick.dll!QQuickTextControlPrivate::inputMethodEvent(QInputMethodEvent * e) Line 1313	C++
 	Qt6Quick.dll!QQuickTextControl::processEvent(QEvent * e, const QPointF & coordinateOffset) Line 707	C++
 	Qt6Quick.dll!QQuickTextEdit::inputMethodEvent(QInputMethodEvent * event) Line 2255	C++
 	Qt6Quick.dll!QQuickItem::event(QEvent * ev) Line 9164	C++
 	Qt6Core.dll!QCoreApplication::notifyInternal2(QObject * receiver, QEvent * event) Line 1177	C++
 	qwindows.dll!QWindowsInputContext::composition(HWND__ * hwnd, __int64 lParamIn) Line 522	C++
 	qwindows.dll!QWindowsContext::windowsProc(HWND__ * hwnd, unsigned int message, QtWindows::WindowsEventType et, unsigned __int64 wParam, __int64 lParam, __int64 * result, QWindowsWindow * * platformWindowPtr) Line 1026	C++
 	qwindows.dll!qWindowsWndProc(HWND__ * hwnd, unsigned int message, unsigned __int64 wParam, __int64 lParam) Line 1500	C++
...

      It looks like that cursor block's layout can be nullptr under some circumstances.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-17213 QTextControlPrivate::inputMethodEvent() crash

          • 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; Flaky tests; 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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              esabraha Eskil Abrahamsen Blomfeldt
              studiosus Vladimir Belyavsky
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                Updated:

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