[Interest] click on QComboBox caused application to crash in Windows Server 2012

Mehrdad Momeny mehrdad.momeny at gmail.com
Tue Aug 6 03:53:14 CEST 2013

Hi everyone,
Recently I encountered a weird issue on Windows Server 2012, when user
clicks on a Combo box to open it, it causes the application to crash, our
app uses a specific stylesheet, but removing that stylesheet didn't change

We are using Qt 4.8.3 (I tried with 4.8.5 but no difference)
and I didn't find anyone else (anyone who spoke about it on the internet)
having this issue :/

Here is the back trace of crash which stops in line 2563 of qcombobox.cpp
calling view()->scrollTo(view()->currentIndex(), ...)
Generated by Visual Studio 2008

QtGuid4.dll!QComboBox::showPopup()  Line 2563 + 0x2e bytes	C++
QtGuid4.dll!QComboBox::mousePressEvent(QMouseEvent * e=0x00919f20)
Line 2901	C++
QtGuid4.dll!QWidget::event(QEvent * event=0x00919f20)  Line 8368	C++
QtGuid4.dll!QComboBox::event(QEvent * event=0x00919f20)  Line 2873	C++
QtGuid4.dll!QApplicationPrivate::notify_helper(QObject *
receiver=0x08119788, QEvent * e=0x00919f20)  Line 4557 + 0x11
bytes	C++
QtGuid4.dll!QApplication::notify(QObject * receiver=0x08119788, QEvent
* e=0x00919f20)  Line 4100 + 0x2f bytes	C++
QtCored4.dll!QCoreApplication::notifyInternal(QObject *
receiver=0x08119788, QEvent * event=0x00919f20)  Line 915 + 0x15
bytes	C++
QtCored4.dll!QCoreApplication::sendSpontaneousEvent(QObject *
receiver=0x08119788, QEvent * event=0x00919f20)  Line 234 + 0x38
bytes	C++
QtGuid4.dll!QApplicationPrivate::sendMouseEvent(QWidget *
receiver=0x08119788, QMouseEvent * event=0x00919f20, QWidget *
alienWidget=0x08119788, QWidget * nativeWidget=0x00e89c08, QWidget * *
buttonDown=0x709236ec, QPointer<QWidget> & lastMouseReceiver={...},
bool spontaneous=true)  Line 3166 + 0xe bytes	C++
QtGuid4.dll!QETWidget::translateMouseEvent(const tagMSG & msg={...})
Line 3365 + 0x2a bytes	C++
QtGuid4.dll!QtWndProc(HWND__ * hwnd=0x002201de, unsigned int
message=513, unsigned int wParam=1, long lParam=2818723)  Line 1698 +
0xc bytes	C++

Any idea what may be wrong here!?

Thanks in advance,
Mehrdad Momeny
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