Application that crashed: kontact
Version of the application: 4.3.1
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-gentoo x86_64

What I was doing when the application crashed:
after creating new rule (filter by List Id and move to selected folder) and applying it koncact crashes

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[Current thread is 0 (LWP 3536)]

Thread 2 (Thread 0x7fe951e26910 (LWP 3610)):
#0  0x00007fe9697994fd in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe969a06777 in QWaitCondition::wait () from /usr/lib64/qt4/libQtCore.so.4
#2  0x00007fe9699fda29 in QThreadPoolThread::run () from /usr/lib64/qt4/libQtCore.so.4
#3  0x00007fe969a05a14 in QThreadPrivate::start () from /usr/lib64/qt4/libQtCore.so.4
#4  0x00007fe9697952e7 in start_thread () from /lib/libpthread.so.0
#5  0x00007fe968d5e5ad in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fe96fbbb770 (LWP 3536)):
[KCrash Handler]
#5  0x00007fe95858f1f6 in KMReaderWin::parseMsg (this=0x109ece0, aMsg=0x27e77d0) at /var/tmp/portage/kde-base/kmail-4.3.1/work/kmail-4.3.1/kmail/kmreaderwin.cpp:1678
#6  0x00007fe95857e47a in KMReaderWin::displayMessage (this=0x109ece0) at /var/tmp/portage/kde-base/kmail-4.3.1/work/kmail-4.3.1/kmail/kmreaderwin.cpp:1605
#7  0x00007fe95857e654 in KMReaderWin::updateReaderWin (this=0x109ece0) at /var/tmp/portage/kde-base/kmail-4.3.1/work/kmail-4.3.1/kmail/kmreaderwin.cpp:1545
#8  0x00007fe95858a50d in KMReaderWin::qt_metacall (this=0x109ece0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffc1616010)
    at /var/tmp/portage/kde-base/kmail-4.3.1/work/kmail-4.3.1_build/kmail/kmreaderwin.moc:168
#9  0x00007fe969aebdfd in QMetaObject::activate () from /usr/lib64/qt4/libQtCore.so.4
#10 0x00007fe969ae8693 in QObject::event () from /usr/lib64/qt4/libQtCore.so.4
#11 0x00007fe96a89931c in QApplicationPrivate::notify_helper () from /usr/lib64/qt4/libQtGui.so.4
#12 0x00007fe96a89ebc8 in QApplication::notify () from /usr/lib64/qt4/libQtGui.so.4
#13 0x00007fe96b612666 in KApplication::notify (this=0x7fffc16169c0, receiver=0x109ed88, event=0x7fffc1616650)
    at /var/tmp/portage/kde-base/kdelibs-4.3.1-r1/work/kdelibs-4.3.1/kdeui/kernel/kapplication.cpp:302
#14 0x00007fe969ad9cfb in QCoreApplication::notifyInternal () from /usr/lib64/qt4/libQtCore.so.4
#15 0x00007fe969b01f5e in QTimerInfoList::activateTimers () from /usr/lib64/qt4/libQtCore.so.4
#16 0x00007fe969afef3d in timerSourceDispatch () from /usr/lib64/qt4/libQtCore.so.4
#17 0x00007fe9650d4b2d in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#18 0x00007fe9650d82d8 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#19 0x00007fe9650d8400 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#20 0x00007fe969afee9f in QEventDispatcherGlib::processEvents () from /usr/lib64/qt4/libQtCore.so.4
#21 0x00007fe96a91e2ae in QGuiEventDispatcherGlib::processEvents () from /usr/lib64/qt4/libQtGui.so.4
#22 0x00007fe969ad86a2 in QEventLoop::processEvents () from /usr/lib64/qt4/libQtCore.so.4
#23 0x00007fe969ad883c in QEventLoop::exec () from /usr/lib64/qt4/libQtCore.so.4
#24 0x00007fe969ada8dc in QCoreApplication::exec () from /usr/lib64/qt4/libQtCore.so.4
#25 0x000000000040431d in main (argc=<value optimized out>, argv=<value optimized out>) at /var/tmp/portage/kde-base/kontact-4.3.1/work/kontact-4.3.1/kontact/src/main.cpp:218

Reported using DrKonqi