Application: kontact (4.4 rc2)
KDE Platform Version: 4.3.98 (KDE 4.3.98 (KDE 4.4 RC3)) "release 218"
Qt Version: 4.6.1
Operating System: Linux 2.6.31.8-0.1-desktop x86_64
Distribution: "openSUSE 11.2 (x86_64)"

-- Information about the crash:
I have started Kontact twice, because Kontact was already active and after closing both, the application chrashed

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#5  KMKernel::abortMailCheck (this=0x0) at /usr/src/debug/kdepim-4.3.98/kmail/kmkernel.cpp:2442
#6  0x00007f80df1320cc in KMailPart::~KMailPart (this=0x1387d50, __in_chrg=<value optimized out>, __vtt_parm=<value optimized out>) at /usr/src/debug/kdepim-4.3.98/kmail/kmail_part.cpp:139
#7  0x00007f80f71e0bde in KontactInterface::Plugin::~Plugin() () from /usr/lib64/libkontactinterface.so.4
#8  0x00007f80dfe101a5 in KMailPlugin::~KMailPlugin (this=0x0, __in_chrg=<value optimized out>, __vtt_parm=<value optimized out>)
    at /usr/src/debug/kdepim-4.3.98/kontact/plugins/kmail/kmail_plugin.cpp:159
#9  0x00007f80f77859ef in Kontact::MainWindow::~MainWindow (this=0x12a8360, __in_chrg=<value optimized out>, __vtt_parm=<value optimized out>)
    at /usr/src/debug/kdepim-4.3.98/kontact/src/mainwindow.cpp:258
#10 0x00007f80f6070b5d in QObject::event(QEvent*) () from /usr/lib64/libQtCore.so.4
#11 0x00007f80f54755ef in QWidget::event(QEvent*) () from /usr/lib64/libQtGui.so.4
#12 0x00007f80f58354db in QMainWindow::event(QEvent*) () from /usr/lib64/libQtGui.so.4
#13 0x00007f80f6a84c23 in KXmlGuiWindow::event(QEvent*) () from /usr/lib64/libkdeui.so.5
#14 0x00007f80f541fc9c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#15 0x00007f80f542627b in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#16 0x00007f80f69bdba6 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#17 0x00007f80f6060dfc in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQtCore.so.4
#18 0x00007f80f6063577 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib64/libQtCore.so.4
#19 0x00007f80f608a7e3 in ?? () from /usr/lib64/libQtCore.so.4
#20 0x00007f80ed87cdee in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#21 0x00007f80ed8807b8 in ?? () from /usr/lib64/libglib-2.0.so.0
#22 0x00007f80ed8808e0 in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#23 0x00007f80f608a323 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#24 0x00007f80f54cddce in ?? () from /usr/lib64/libQtGui.so.4
#25 0x00007f80f605f712 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#26 0x00007f80f605faec in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#27 0x00007f80f606383b in QCoreApplication::exec() () from /usr/lib64/libQtCore.so.4
#28 0x0000000000403ed7 in main (argc=<value optimized out>, argv=<value optimized out>) at /usr/src/debug/kdepim-4.3.98/kontact/src/main.cpp:221

Reported using DrKonqi