[Qt-interest] Problems with Valgrind and Qt / QWS (*NOT* memory "leaks")

[Atlant Schmidt]

Folks:

  NB: This question *IS NOT* about Valgrind reporting memory leaks.

  We're testing one of our apps with Valgrind. It's a fairly vanilla Qt
  app compiled and run against Qt 4.6.2* and using the QWS window
  server.

  Valgrind reports a number of errors that appear to arise within Qt:


 *   A whole cascade** of "uninitialized value" errors relating to
QTextFormatCollection::createObjectIndex()
calling QTextFormatCollection::indexForFormat().


 *   Lots of "Invalid read of size 1" errors that all seem to be related
to font processing (mostly QPF font processing).


  Are these errors familiar to anyone? Are they real? Are they corrected
  in a later version of Qt/QWS?

                                      Atlant


* We'd be using a newer version of Qt but when 4.6.3 came out, we
  encountered a font problem that prevented us from moving to that
  version and so for the moment, we've "locked in" at 4.6.2.


** Details:

Use of uninitialised value of size 4
   at 0xFC90DEC: QHashData::nextNode(QHashData::Node*) (in /usr/lib/libQtCore.so.4.6.2)
   by 0xF644CE3: QTextFormatCollection::indexForFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF644DF7: QTextFormatCollection::createObjectIndex(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF65B7D7: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF65BBEB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF67E90F: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF67F3BB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF660D03: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF64F277: QTextDocument::setHtml(QString const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A75B: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A993: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81ABBB: ??? (in /usr/lib/libQtGui.so.4.6.2)

Conditional jump or move depends on uninitialised value(s)
   at 0xF6449A8: QTextFormatCollection::indexForFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF68B027: QTextCursor::insertText(QString const&, QTextCharFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF68EB37: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF6924F3: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF64F297: QTextDocument::setHtml(QString const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A75B: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A993: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81ABBB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81B363: QLabel::paintEvent(QPaintEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF45782F: QWidget::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF8156C7: QFrame::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81945F: QLabel::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)

Conditional jump or move depends on uninitialised value(s)
   at 0xF644C18: QTextFormatCollection::indexForFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF68B027: QTextCursor::insertText(QString const&, QTextCharFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF68EB37: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF6924F3: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF64F297: QTextDocument::setHtml(QString const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A75B: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A993: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81ABBB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81B363: QLabel::paintEvent(QPaintEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF45782F: QWidget::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF8156C7: QFrame::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81945F: QLabel::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)

Use of uninitialised value of size 4
   at 0xF644978: QTextFormatCollection::indexForFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF6483F7: QTextObject::setFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81AA4B: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81ABBB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81B363: QLabel::paintEvent(QPaintEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF45782F: QWidget::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF8156C7: QFrame::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81945F: QLabel::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF3F2273: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF3FB653: QApplication::notify(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0x100343FB: ??? (in /dialysis/ui/bin/uiclinician_g)
   by 0xFD7DBAB: QCoreApplication::notifyInternal(QObject*, QEvent*) (in /usr/lib/libQtCore.so.4.6.2)

Use of uninitialised value of size 4
   at 0xF644C00: QTextFormatCollection::indexForFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF6483F7: QTextObject::setFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81AA4B: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81ABBB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81B363: QLabel::paintEvent(QPaintEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF45782F: QWidget::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF8156C7: QFrame::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81945F: QLabel::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF3F2273: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF3FB653: QApplication::notify(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0x100343FB: ??? (in /dialysis/ui/bin/uiclinician_g)
   by 0xFD7DBAB: QCoreApplication::notifyInternal(QObject*, QEvent*) (in /usr/lib/libQtCore.so.4.6.2)

Use of uninitialised value of size 4
   at 0xF644C44: QTextFormatCollection::indexForFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF6483F7: QTextObject::setFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81AA4B: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81ABBB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81B363: QLabel::paintEvent(QPaintEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF45782F: QWidget::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF8156C7: QFrame::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81945F: QLabel::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF3F2273: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF3FB653: QApplication::notify(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0x100343FB: ??? (in /dialysis/ui/bin/uiclinician_g)
   by 0xFD7DBAB: QCoreApplication::notifyInternal(QObject*, QEvent*) (in /usr/lib/libQtCore.so.4.6.2)

Later...

Conditional jump or move depends on uninitialised value(s)
   at 0xF644A24: QTextFormatCollection::indexForFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF65ED77: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF660C57: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF64F277: QTextDocument::setHtml(QString const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A75B: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A993: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81ABBB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81B363: QLabel::paintEvent(QPaintEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF45782F: QWidget::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF8156C7: QFrame::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81945F: QLabel::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF3F2273: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.6.2)

Conditional jump or move depends on uninitialised value(s)
   at 0xF644A24: QTextFormatCollection::indexForFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF65ED9B: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF660C57: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF64F277: QTextDocument::setHtml(QString const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A75B: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A993: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81ABBB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81B363: QLabel::paintEvent(QPaintEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF45782F: QWidget::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF8156C7: QFrame::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81945F: QLabel::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF3F2273: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.6.2)

Conditional jump or move depends on uninitialised value(s)
   at 0xF644A24: QTextFormatCollection::indexForFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF644DF7: QTextFormatCollection::createObjectIndex(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF65B7D7: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF65BBEB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF67E90F: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF67F3BB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF660D03: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF64F277: QTextDocument::setHtml(QString const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A75B: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A993: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81ABBB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81B363: QLabel::paintEvent(QPaintEvent*) (in /usr/lib/libQtGui.so.4.6.2)

Conditional jump or move depends on uninitialised value(s)
   at 0xFC90DE4: QHashData::nextNode(QHashData::Node*) (in /usr/lib/libQtCore.so.4.6.2)
   by 0xF644CE3: QTextFormatCollection::indexForFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF644DF7: QTextFormatCollection::createObjectIndex(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF65B7D7: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF65BBEB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF67E90F: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF67F3BB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF660D03: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF64F277: QTextDocument::setHtml(QString const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A75B: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A993: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81ABBB: ??? (in /usr/lib/libQtGui.so.4.6.2)

Use of uninitialised value of size 4
   at 0xFC90DEC: QHashData::nextNode(QHashData::Node*) (in /usr/lib/libQtCore.so.4.6.2)
   by 0xF644CE3: QTextFormatCollection::indexForFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF644DF7: QTextFormatCollection::createObjectIndex(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF65B7D7: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF65BBEB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF67E90F: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF67F3BB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF660D03: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF64F277: QTextDocument::setHtml(QString const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A75B: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A993: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81ABBB: ??? (in /usr/lib/libQtGui.so.4.6.2)

Conditional jump or move depends on uninitialised value(s)
   at 0xF6449A8: QTextFormatCollection::indexForFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF68B027: QTextCursor::insertText(QString const&, QTextCharFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF68EB37: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF6924F3: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF64F297: QTextDocument::setHtml(QString const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A75B: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A993: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81ABBB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81B363: QLabel::paintEvent(QPaintEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF45782F: QWidget::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF8156C7: QFrame::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81945F: QLabel::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)

Conditional jump or move depends on uninitialised value(s)
   at 0xF644C18: QTextFormatCollection::indexForFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF68B027: QTextCursor::insertText(QString const&, QTextCharFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF68EB37: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF6924F3: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF64F297: QTextDocument::setHtml(QString const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A75B: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81A993: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81ABBB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81B363: QLabel::paintEvent(QPaintEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF45782F: QWidget::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF8156C7: QFrame::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81945F: QLabel::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)

Use of uninitialised value of size 4
   at 0xF644978: QTextFormatCollection::indexForFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF6483F7: QTextObject::setFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81AA4B: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81ABBB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81B363: QLabel::paintEvent(QPaintEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF45782F: QWidget::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF8156C7: QFrame::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81945F: QLabel::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF3F2273: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF3FB653: QApplication::notify(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0x100343FB: ??? (in /dialysis/ui/bin/uiclinician_g)
   by 0xFD7DBAB: QCoreApplication::notifyInternal(QObject*, QEvent*) (in /usr/lib/libQtCore.so.4.6.2)

Use of uninitialised value of size 4
   at 0xF644C00: QTextFormatCollection::indexForFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF6483F7: QTextObject::setFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81AA4B: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81ABBB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81B363: QLabel::paintEvent(QPaintEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF45782F: QWidget::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF8156C7: QFrame::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81945F: QLabel::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF3F2273: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF3FB653: QApplication::notify(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0x100343FB: ??? (in /dialysis/ui/bin/uiclinician_g)
   by 0xFD7DBAB: QCoreApplication::notifyInternal(QObject*, QEvent*) (in /usr/lib/libQtCore.so.4.6.2)

Use of uninitialised value of size 4
   at 0xF644C44: QTextFormatCollection::indexForFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF6483F7: QTextObject::setFormat(QTextFormat const&) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81AA4B: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81ABBB: ??? (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81B363: QLabel::paintEvent(QPaintEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF45782F: QWidget::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF8156C7: QFrame::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF81945F: QLabel::event(QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF3F2273: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0xF3FB653: QApplication::notify(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.6.2)
   by 0x100343FB: ??? (in /dialysis/ui/bin/uiclinician_g)
   by 0xFD7DBAB: QCoreApplication::notifyInternal(QObject*, QEvent*) (in /usr/lib/libQtCore.so.4.6.2)


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