Directly after starting the program ksudoku the following information is shown in the kde crash handler:

[?1034h(no debugging symbols found)
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[Thread debugging using libthread_db enabled]
[New Thread 0x7f01290a3700 (LWP 4099)]
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[KCrash handler]
#5  0x00007f0122fc6627 in ?? () from /usr/lib64/libQtGui.so.4
#6  0x00007f0122fc6b05 in QCursor::handle () from /usr/lib64/libQtGui.so.4
#7  0x00007f0122fd4a61 in ?? () from /usr/lib64/libQtGui.so.4
#8  0x00007f0122fd8eaa in QWidgetPrivate::create_sys ()
   from /usr/lib64/libQtGui.so.4
#9  0x00007f0122fa7512 in QWidget::create () from /usr/lib64/libQtGui.so.4
#10 0x00007f0122fa7f3d in QWidgetPrivate::setWindowTitle_helper ()
   from /usr/lib64/libQtGui.so.4
#11 0x00007f0122fa812b in QWidget::setWindowTitle ()
   from /usr/lib64/libQtGui.so.4
#12 0x00007f0127c15288 in ?? () from /usr/lib64/libkdeui.so.5
#13 0x00007f0127c156db in KMainWindow::KMainWindow ()
   from /usr/lib64/libkdeui.so.5
#14 0x00007f0127c42d69 in KXmlGuiWindow::KXmlGuiWindow ()
   from /usr/lib64/libkdeui.so.5
#15 0x000000000041a9ee in _start ()
#0  0x00007f012239f210 in nanosleep () from /lib64/libc.so.6