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 2.6.28-15-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
Switching Kmail's layout to show message previews (quick-viewer?) beside messages instead of underneath messages crashed Kontact/Kmail.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  0xb125c2e1 in ?? () from /usr/lib/libkmailprivate.so.4
#7  0xb0efc71e in ?? () from /usr/lib/libkmailprivate.so.4
#8  0xb122dd27 in ?? () from /usr/lib/libkmailprivate.so.4
#9  0xb1232394 in ?? () from /usr/lib/libkmailprivate.so.4
#10 0xb5c2a1b8 in QMetaObject::activate (sender=0x9e9ea60, from_signal_index=7, to_signal_index=7, argv=0xbffb91fc) at kernel/qobject.cpp:3113
#11 0xb5c2ae42 in QMetaObject::activate (sender=0x9e9ea60, m=0xb5faeda8, local_signal_index=3, argv=0xbffb91fc) at kernel/qobject.cpp:3187
#12 0xb5e510b3 in KJob::result (this=0x9e9ea60, _t1=0x9e9ea60) at /build/buildd/kde4libs-4.3.1/obj-i486-linux-gnu/kdecore/kjob.moc:188
#13 0xb5e51559 in KJob::emitResult (this=0x9e9ea60) at /build/buildd/kde4libs-4.3.1/kdecore/jobs/kjob.cpp:304
#14 0xb6f4f995 in KIO::SimpleJob::slotFinished (this=0x9e9ea60) at /build/buildd/kde4libs-4.3.1/kio/kio/job.cpp:477
#15 0xb6f502d3 in KIO::TransferJob::slotFinished (this=0x9e9ea60) at /build/buildd/kde4libs-4.3.1/kio/kio/job.cpp:948
#16 0xb6f4c87b in KIO::TransferJob::qt_metacall (this=0x9e9ea60, _c=QMetaObject::InvokeMetaMethod, _id=7, _a=0xbffb9438) at /build/buildd/kde4libs-4.3.1/obj-i486-linux-gnu/kio/jobclasses.moc:343
#17 0xb5c2a1b8 in QMetaObject::activate (sender=0x9661028, from_signal_index=8, to_signal_index=8, argv=0x0) at kernel/qobject.cpp:3113
#18 0xb5c2ae42 in QMetaObject::activate (sender=0x9661028, m=0xb70f8f44, local_signal_index=4, argv=0x0) at kernel/qobject.cpp:3187
#19 0xb70158d7 in KIO::SlaveInterface::finished (this=0x9661028) at /build/buildd/kde4libs-4.3.1/obj-i486-linux-gnu/kio/slaveinterface.moc:165
#20 0xb7019617 in KIO::SlaveInterface::dispatch (this=0x9661028, _cmd=104, rawdata=@0xbffb9604) at /build/buildd/kde4libs-4.3.1/kio/kio/slaveinterface.cpp:175
#21 0xb7015db7 in KIO::SlaveInterface::dispatch (this=0x9661028) at /build/buildd/kde4libs-4.3.1/kio/kio/slaveinterface.cpp:91
#22 0xb7007b2d in KIO::Slave::gotInput (this=0x9661028) at /build/buildd/kde4libs-4.3.1/kio/kio/slave.cpp:322
#23 0xb7009fc3 in KIO::Slave::qt_metacall (this=0x9661028, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbffb9718) at /build/buildd/kde4libs-4.3.1/obj-i486-linux-gnu/kio/slave.moc:76
#24 0xb5c2a1b8 in QMetaObject::activate (sender=0x9661aa8, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#25 0xb5c2ae42 in QMetaObject::activate (sender=0x9661aa8, m=0xb70f5880, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#26 0xb6f13697 in KIO::Connection::readyRead (this=0x9661aa8) at /build/buildd/kde4libs-4.3.1/obj-i486-linux-gnu/kio/connection.moc:86
#27 0xb6f15003 in KIO::ConnectionPrivate::dequeue (this=0x96601c0) at /build/buildd/kde4libs-4.3.1/kio/kio/connection.cpp:82
#28 0xb6f153e6 in KIO::Connection::qt_metacall (this=0x9661aa8, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x9526a10) at /build/buildd/kde4libs-4.3.1/obj-i486-linux-gnu/kio/connection.moc:73
#29 0xb5c238cb in QMetaCallEvent::placeMetaCall (this=0x94eda50, object=0x9661aa8) at kernel/qobject.cpp:477
#30 0xb5c253b0 in QObject::event (this=0x9661aa8, e=0x94eda50) at kernel/qobject.cpp:1111
#31 0xb60d7d3c in QApplicationPrivate::notify_helper (this=0x900c7d0, receiver=0x9661aa8, e=0x94eda50) at kernel/qapplication.cpp:4056
#32 0xb60e003e in QApplication::notify (this=0xbffb9ed8, receiver=0x9661aa8, e=0x94eda50) at kernel/qapplication.cpp:3603
#33 0xb6cd185d in KApplication::notify (this=0xbffb9ed8, receiver=0x9661aa8, event=0x94eda50) at /build/buildd/kde4libs-4.3.1/kdeui/kernel/kapplication.cpp:302
#34 0xb5c14bcb in QCoreApplication::notifyInternal (this=0xbffb9ed8, receiver=0x9661aa8, event=0x94eda50) at kernel/qcoreapplication.cpp:610
#35 0xb5c15825 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x8fe7440) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#36 0xb5c15a1d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1140
#37 0xb5c406af in postEventSourceDispatch (s=0x9014d90) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#38 0xb4ce5b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#39 0xb4ce90eb in ?? () from /usr/lib/libglib-2.0.so.0
#40 0xb4ce9268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#41 0xb5c402f8 in QEventDispatcherGlib::processEvents (this=0x8fe7028, flags={i = -1074029144}) at kernel/qeventdispatcher_glib.cpp:327
#42 0xb6179a75 in QGuiEventDispatcherGlib::processEvents (this=0x8fe7028, flags={i = -1074029096}) at kernel/qguieventdispatcher_glib.cpp:202
#43 0xb5c131fa in QEventLoop::processEvents (this=0xbffb9e50, flags={i = -1074029032}) at kernel/qeventloop.cpp:149
#44 0xb5c13642 in QEventLoop::exec (this=0xbffb9e50, flags={i = -1074028968}) at kernel/qeventloop.cpp:201
#45 0xb5c15ae9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#46 0xb60d7bb7 in QApplication::exec () at kernel/qapplication.cpp:3525
#47 0x0804bfef in _start ()

Reported using DrKonqi