Warning "Invalid socket XX and type 'Read', disabling..." issued when QProcess is restarted from slot connected to QProcess::stateChanged

#include <QCoreApplication>
#include <QStringList>
#include <QObject>
#include <QProcess>
#include <QtDebug>


class Foo: public QObject
{
    Q_OBJECT
public:

    Foo(QObject* parent=0):
        QObject(parent)
    {
        _coprocess = new QProcess(this);

        _coprocess->setProcessChannelMode(QProcess::ForwardedChannels);

        this->connect(
            _coprocess, SIGNAL(stateChanged(QProcess::ProcessState)),
            SLOT(onCoprocessStateChanged(QProcess::ProcessState))
        );
    }

    void startCoprocess()
    {
        _coprocess->start("ps");
    }

private slots:

    void onCoprocessStateChanged(QProcess::ProcessState state)
    {
        qDebug() << "coprocess state changed to" << state;

        if (state == QProcess::NotRunning)
            startCoprocess();
    }

private:
    QProcess* _coprocess;
};


int main(int argc, char* argv[])
{
    QCoreApplication app(argc, argv);

    Foo foo;

    foo.startCoprocess();

    return app.exec();
}


#include "main.moc"