Application that crashed: kmail
Version of the application: 1.12.2
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-16-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
In Kmail>Setting>Kmail Configure >Appearance> Layout > Shor folder list + Show favourite folder view + Show folder quick search 
this makes it crash 1st time then it runs fine 

 -- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[KCrash Handler]
#6  0x00da5acf in ?? () from /usr/lib/libkmailprivate.so.4
#7  0x00a43e62 in ?? () from /usr/lib/libkmailprivate.so.4
#8  0x00d76dd0 in ?? () from /usr/lib/libkmailprivate.so.4
#9  0x00d7b60f in ?? () from /usr/lib/libkmailprivate.so.4
#10 0x0697a263 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#11 0x0697aec2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#12 0x007bcfe3 in KJob::result(KJob*) () from /usr/lib/libkdecore.so.5
#13 0x007bd469 in KJob::emitResult() () from /usr/lib/libkdecore.so.5
#14 0x01a0a660 in KIO::SimpleJob::slotFinished() () from /usr/lib/libkio.so.5
#15 0x01a0ab7a in KIO::TransferJob::slotFinished() () from /usr/lib/libkio.so.5
#16 0x01a088a3 in KIO::TransferJob::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#17 0x0697a263 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#18 0x0697aec2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#19 0x01ad4557 in KIO::SlaveInterface::finished() () from /usr/lib/libkio.so.5
#20 0x01ad844d in KIO::SlaveInterface::dispatch(int, QByteArray const&) () from /usr/lib/libkio.so.5
#21 0x01ad4a13 in KIO::SlaveInterface::dispatch() () from /usr/lib/libkio.so.5
#22 0x01ac6aea in KIO::Slave::gotInput() () from /usr/lib/libkio.so.5
#23 0x01ac8ee3 in KIO::Slave::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#24 0x0697a263 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#25 0x0697aec2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#26 0x019d0f97 in KIO::Connection::readyRead() () from /usr/lib/libkio.so.5
#27 0x019d2d5e in ?? () from /usr/lib/libkio.so.5
#28 0x019d2e8e in KIO::Connection::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#29 0x06972f0b in QMetaCallEvent::placeMetaCall(QObject*) () from /usr/lib/libQtCore.so.4
#30 0x069745fe in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#31 0x04b19f54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#32 0x04b2167c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#33 0x00523bfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#34 0x069646cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#35 0x069652b2 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#36 0x0696547d in QCoreApplication::sendPostedEvents(QObject*, int) () from /usr/lib/libQtCore.so.4
#37 0x0698f3ff in ?? () from /usr/lib/libQtCore.so.4
#38 0x02316e78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#39 0x0231a720 in ?? () from /lib/libglib-2.0.so.0
#40 0x0231a853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#41 0x0698f02c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#42 0x04bbabe5 in ?? () from /usr/lib/libQtGui.so.4
#43 0x06962c79 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#44 0x069630ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#45 0x0696553f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#46 0x04b19dd7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#47 0x0804a702 in _start ()

Reported using DrKonqi