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 2.6.27-gentoo-r8 x86_64

What I was doing when the application crashed:
Log in, Kontakt start with 2 Windows (KMail 2 IMAP Konto), i close one, and Error.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[Current thread is 0 (LWP 1092)]

Thread 2 (Thread 0x7f932e437950 (LWP 1139)):
#0  0x00007f934a52003d in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007f934a78d327 in QWaitCondition::wait () from /usr/lib64/qt4/libQtCore.so.4
#2  0x00007f934a784721 in ?? () from /usr/lib64/qt4/libQtCore.so.4
#3  0x00007f934a78c604 in ?? () from /usr/lib64/qt4/libQtCore.so.4
#4  0x00007f934a51c007 in start_thread () from /lib/libpthread.so.0
#5  0x00007f9349aec48d in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f935093e760 (LWP 1092)):
[KCrash Handler]
#5  0x00007f9335302625 in KMMainWidget::slotCheckMail () from /usr/lib64/libkmailprivate.so.4
#6  0x00007f9335325694 in KMMainWidget::qt_metacall () from /usr/lib64/libkmailprivate.so.4
#7  0x00007f934a870f05 in QMetaObject::activate () from /usr/lib64/qt4/libQtCore.so.4
#8  0x00007f934b6117b7 in QAction::triggered () from /usr/lib64/qt4/libQtGui.so.4
#9  0x00007f934b612a10 in QAction::activate () from /usr/lib64/qt4/libQtGui.so.4
#10 0x00007f934b936a3a in ?? () from /usr/lib64/qt4/libQtGui.so.4
#11 0x00007f934b936cad in QAbstractButton::mouseReleaseEvent () from /usr/lib64/qt4/libQtGui.so.4
#12 0x00007f934b9f2a8a in QToolButton::mouseReleaseEvent () from /usr/lib64/qt4/libQtGui.so.4
#13 0x00007f934b662d78 in QWidget::event () from /usr/lib64/qt4/libQtGui.so.4
#14 0x00007f934b616a5d in QApplicationPrivate::notify_helper () from /usr/lib64/qt4/libQtGui.so.4
#15 0x00007f934b61e933 in QApplication::notify () from /usr/lib64/qt4/libQtGui.so.4
#16 0x00007f934c3a384b in KApplication::notify () from /usr/lib64/libkdeui.so.5
#17 0x00007f934a85f023 in QCoreApplication::notifyInternal () from /usr/lib64/qt4/libQtCore.so.4
#18 0x00007f934b61fdb8 in QApplicationPrivate::sendMouseEvent () from /usr/lib64/qt4/libQtGui.so.4
#19 0x00007f934b6781dc in ?? () from /usr/lib64/qt4/libQtGui.so.4
#20 0x00007f934b676d56 in QApplication::x11ProcessEvent () from /usr/lib64/qt4/libQtGui.so.4
#21 0x00007f934b69af6c in ?? () from /usr/lib64/qt4/libQtGui.so.4
#22 0x00007f9345c2fe51 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#23 0x00007f9345c333e8 in ?? () from /usr/lib/libglib-2.0.so.0
#24 0x00007f9345c3359c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#25 0x00007f934a883bef in QEventDispatcherGlib::processEvents () from /usr/lib64/qt4/libQtCore.so.4
#26 0x00007f934b69a83f in ?? () from /usr/lib64/qt4/libQtGui.so.4
#27 0x00007f934a85da22 in QEventLoop::processEvents () from /usr/lib64/qt4/libQtCore.so.4
#28 0x00007f934a85dbbc in QEventLoop::exec () from /usr/lib64/qt4/libQtCore.so.4
#29 0x00007f934a85fbb4 in QCoreApplication::exec () from /usr/lib64/qt4/libQtCore.so.4
#30 0x0000000000404b41 in _start ()

Reported using DrKonqi