Valgrind Memory Analyzer is crashing Qt Creator

Guerrian · 23 Oct 2019, 15:34

Running "Analyzer -> Valgrind Memory Analyzer" in Qt Creator 3.5.1 on Linux Mint 18.3, is mostly crashing Qt. The main window of Qt disappears when this happens.

When it doesn't crash the only issues that are reported by the analyzer for my application are "external errors".

Is there a crash log I can look at? Should I worry?

Here is one of the issues:

9 bytes in 1 blocks are definitely lost in loss record 282 of 8,078
  in SolveDialog::showSolution(Model&amp;, MD&amp;, int*) in /home/daniel/Documents/Qt/exxx/solvedialog.cpp:127
  1: malloc in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so
  2: /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0
  3: _XmbTextListToTextProperty in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0
  4: 0x40b438e
  5: QWindow::setTitle(QString const&amp;) in /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.5.1
  6: QWidgetPrivate::setWindowTitle_helper(QString const&amp;) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.5.1
  7: QWidget::create(unsigned long long, bool, bool) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.5.1
  8: QWidget::setVisible(bool) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.5.1
  9: QDialog::setVisible(bool) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.5.1
  10: QDialog::exec() in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.5.1
  11: SolveDialog::showSolution(Model&amp;, MD&amp;, int*) in /home/daniel/Documents/Qt/exxx/solvedialog.cpp:127
  12: MainWindow::viewSolution() in /home/daniel/Documents/Qt/exxx/mainwindow.cpp:298
  13: MainWindow::solved() in /home/daniel/Documents/Qt/exxx/mainwindow.cpp:424
  14: QObject::event(QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.5.1
  15: QWidget::event(QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.5.1
  16: QMainWindow::event(QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.5.1
  17: QApplicationPrivate::notify_helper(QObject*, QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.5.1
  18: QApplication::notify(QObject*, QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.5.1
  19: Application::notify(QObject*, QEvent*) in /home/daniel/Documents/Qt/exxx/main.cpp:107
  20: QCoreApplication::notifyInternal(QObject*, QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.5.1
  21: QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) in /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.5.1
  22: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.5.1
  23: g_main_context_dispatch in /lib/x86_64-linux-gnu/libglib-2.0.so.0.4800.2
  24: /lib/x86_64-linux-gnu/libglib-2.0.so.0.4800.2
  25: g_main_context_iteration in /lib/x86_64-linux-gnu/libglib-2.0.so.0.4800.2

The line where this is reported is on an exec command for a dialog. The dialog has code such as:

SolveDialog::SolveDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::SolveDialog)
{
    ui->setupUi(this);
    ui->tableWidget->setHorizontalHeaderLabels(QStringList() << tr("Class") << tr("Item Index") << tr("Item Name")
        << tr("Item Cost") << tr("Item Value"));
    setWindowFlags(Qt::Window | Qt::WindowMaximizeButtonHint | Qt::WindowCloseButtonHint);
}

SolveDialog::~SolveDialog()
{
    delete ui;
}

aha_1980 · wrote on 23 Oct 2019, 15:34

@Guerrian

Creator 3.5.1

You should upgrade! We have 4.10.1 and a 4.11 beta.

Regards

Guerrian · 23 Oct 2019, 17:43

Hi. I installed Qt with the Software Manager in Linux Mint. Do you have a link to some instructions for upgrading Qt / Qt Creator?

All I have found is:
link text

Thanks

aha_1980 · wrote on 23 Oct 2019, 17:43

@Guerrian

http://download.qt.io/official_releases/qtcreator has standalone installers. You can even put that in your $HOME.

Guerrian · wrote on 23 Oct 2019, 22:14

I upgraded to Qt Creator 4.10.1 and recompiled my app. I get an actual reported error now as opposed to a crash. So I'm marking this as solved.