Application that crashed: kontact
Version of the application: 4.3.0 rc3
KDE Version: 4.2.98 (KDE 4.2.98 (KDE 4.3 RC3))
Qt Version: 4.5.0
Operating System: Linux 2.6.28-14-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
When I clicked ok, on the dialog after kmail disconnected (router failure), it crashed. 

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  0xb703a5fd in KIO::Slave::deref () from /usr/lib/libkio.so.5
#7  0xb703adec in KIO::Slave::gotInput () from /usr/lib/libkio.so.5
#8  0xb703d273 in KIO::Slave::qt_metacall () from /usr/lib/libkio.so.5
#9  0xb5c13ca8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#10 0xb5c14932 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#11 0xb6f47147 in KIO::Connection::readyRead () from /usr/lib/libkio.so.5
#12 0xb6f48ab3 in ?? () from /usr/lib/libkio.so.5
#13 0xb6f48e96 in KIO::Connection::qt_metacall () from /usr/lib/libkio.so.5
#14 0xb5c0c8fb in QMetaCallEvent::placeMetaCall () from /usr/lib/libQtCore.so.4
#15 0xb5c0e3a0 in QObject::event () from /usr/lib/libQtCore.so.4
#16 0xb60dfe9c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#17 0xb60e819e in QApplication::notify () from /usr/lib/libQtGui.so.4
#18 0xb6d065cd in KApplication::notify () from /usr/lib/libkdeui.so.5
#19 0xb5bfda3b in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#20 0xb5bfe695 in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#21 0xb5bfe88d in QCoreApplication::sendPostedEvents () from /usr/lib/libQtCore.so.4
#22 0xb5c297ef in ?? () from /usr/lib/libQtCore.so.4
#23 0xb4cc2b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#24 0xb4cc60eb in ?? () from /usr/lib/libglib-2.0.so.0
#25 0xb4cc6268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#26 0xb5c29438 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#27 0xb6181365 in ?? () from /usr/lib/libQtGui.so.4
#28 0xb5bfc06a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#29 0xb5bfc4aa in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#30 0xb5bfe959 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#31 0xb60dfd17 in QApplication::exec () from /usr/lib/libQtGui.so.4
#32 0x0804bfef in _start ()

Reported using DrKonqi