diff -r 000000000000 -r 1918ee327afb tests/benchmarks/qiodevice/main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/benchmarks/qiodevice/main.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,107 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#include <QDebug>
+#include <QIODevice>
+#include <QFile>
+#include <QString>
+
+#include <qtest.h>
+
+
+class tst_qiodevice : public QObject
+{
+    Q_OBJECT
+private slots:
+    void read_old();
+    void read_old_data() { read_data(); }
+    //void read_new();
+    //void read_new_data() { read_data(); }
+private:
+    void read_data();
+};
+
+
+void tst_qiodevice::read_data()
+{
+    QTest::addColumn<qint64>("size");
+    QTest::newRow("10k")      << qint64(10 * 1024);
+    QTest::newRow("100k")     << qint64(100 * 1024);
+    QTest::newRow("1000k")    << qint64(1000 * 1024);
+    QTest::newRow("10000k")   << qint64(10000 * 1024);
+#ifndef Q_OS_SYMBIAN // Symbian devices don't (yet) have enough available RAM to run these
+    QTest::newRow("100000k")  << qint64(100000 * 1024);
+    QTest::newRow("1000000k") << qint64(1000000 * 1024);
+#endif
+}
+
+void tst_qiodevice::read_old()
+{
+    QFETCH(qint64, size);
+
+    QString name = "tmp" + QString::number(size);
+
+    {
+        QFile file(name);
+        file.open(QIODevice::WriteOnly);
+        file.seek(size);
+        file.write("x", 1);
+        file.close();
+    }
+
+    QBENCHMARK {
+        QFile file(name);
+        file.open(QIODevice::ReadOnly);
+        QByteArray ba;
+        qint64 s = size - 1024;
+        file.seek(512);
+        ba = file.read(s);  // crash happens during this read / assignment operation
+    }
+
+    {
+        QFile file(name);
+        file.remove();
+    }
+}
+
+
+QTEST_MAIN(tst_qiodevice)
+
+#include "main.moc"