Application that crashed: kontact
Version of the application: 4.3.0 rc2
KDE Version: 4.2.96 (KDE 4.2.96 (KDE 4.3 RC2))
Qt Version: 4.5.2
Operating System: Linux 2.6.30.1 i686

What I was doing when the application crashed:
I right-clicked a folder and selected "Mark as Read."

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  QEventLoop::exec (this=0xa43d160, flags={i = -1075117600}) at ../../include/QtCore/../../src/corelib/tools/qvector.h:129
#7  0xb1fdd299 in KMAccount::runPrecommand (this=0x9844b70, precommand=@0x9844b84) at /var/tmp/portage/kde-base/kmail-4.2.96/work/kmail-4.2.96/kmail/kmaccount.cpp:407
#8  0xb2077a9b in KMAcctLocal::preProcess (this=0x9844b70) at /var/tmp/portage/kde-base/kmail-4.2.96/work/kmail-4.2.96/kmail/kmacctlocal.cpp:134
#9  0xb2078860 in KMAcctLocal::processNewMail (this=0x9844b70) at /var/tmp/portage/kde-base/kmail-4.2.96/work/kmail-4.2.96/kmail/kmacctlocal.cpp:70
#10 0xb206d933 in KMail::AccountManager::processNextCheck (this=0x981b1e0, _newMail=false) at /var/tmp/portage/kde-base/kmail-4.2.96/work/kmail-4.2.96/kmail/accountmanager.cpp:230
#11 0xb206e400 in KMail::AccountManager::singleCheckMail (this=0x981b1e0, account=0x9844b70, interactive=false)
    at /var/tmp/portage/kde-base/kmail-4.2.96/work/kmail-4.2.96/kmail/accountmanager.cpp:157
#12 0xb1fd9bfe in KMAccount::mailCheck (this=0x9844b70) at /var/tmp/portage/kde-base/kmail-4.2.96/work/kmail-4.2.96/kmail/kmaccount.cpp:445
#13 0xb1fda143 in KMAccount::qt_metacall (this=0x9844b70, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbfeb0568)
    at /var/tmp/portage/kde-base/kmail-4.2.96/work/kmail-4.2.96_build/kmail/kmaccount.moc:147
#14 0xb6fab461 in QMetaObject::activate (sender=0x984b240, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x1) at kernel/qobject.cpp:3101
#15 0xb6faba23 in QMetaObject::activate (sender=0x984b240, m=0xb7044924, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3178
#16 0xb6fe3298 in QTimer::timeout (this=0x984b240) at .moc/release-shared/moc_qtimer.cpp:128
#17 0xb6fb22ae in QTimer::timerEvent (this=0x984b240, e=0xbfeb09fc) at kernel/qtimer.cpp:261
#18 0xb6fa816f in QObject::event (this=0x984b240, e=0xbfeb09fc) at kernel/qobject.cpp:1066
#19 0xb73a50cc in QApplicationPrivate::notify_helper (this=0x957c4e8, receiver=0x984b240, e=0xbfeb09fc) at kernel/qapplication.cpp:4056
#20 0xb73adbb3 in QApplication::notify (this=0xbfeb0d9c, receiver=0x984b240, e=0xbfeb09fc) at kernel/qapplication.cpp:3603
#21 0xb7c3d59e in KApplication::notify (this=0xbfeb0d9c, receiver=0x984b240, event=0xbfeb09fc) at /var/tmp/portage/kde-base/kdelibs-4.2.96/work/kdelibs-4.2.96/kdeui/kernel/kapplication.cpp:302
#22 0xb6f98c52 in QCoreApplication::notifyInternal (this=0xbfeb0d9c, receiver=0x984b240, event=0xbfeb09fc) at kernel/qcoreapplication.cpp:606
#23 0xb6fc3bf1 in QTimerInfoList::activateTimers (this=0x957bf24) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#24 0xb6fc0831 in timerSourceDispatch (source=0x957bef0) at kernel/qeventdispatcher_glib.cpp:165
#25 0xb596e43f in IA__g_main_context_dispatch (context=0x957bd90) at gmain.c:1824
#26 0xb5971b8b in g_main_context_iterate (context=0x957bd90, block=1, dispatch=1, self=0x957bb80) at gmain.c:2455
#27 0xb5971d19 in IA__g_main_context_iteration (context=0x957bd90, may_block=1) at gmain.c:2518
#28 0xb6fc0789 in QEventDispatcherGlib::processEvents (this=0x957c260, flags={i = -1075115144}) at kernel/qeventdispatcher_glib.cpp:327
#29 0xb74354d6 in QGuiEventDispatcherGlib::processEvents (this=0x957c260, flags={i = -1075115096}) at kernel/qguieventdispatcher_glib.cpp:202
#30 0xb6f9739b in QEventLoop::processEvents (this=0xbfeb0c10, flags={i = -1075115032}) at kernel/qeventloop.cpp:149
#31 0xb6f9757a in QEventLoop::exec (this=0xbfeb0c10, flags={i = -1075114984}) at kernel/qeventloop.cpp:197
#32 0xb6f997f1 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#33 0xb73a4f38 in QApplication::exec () at kernel/qapplication.cpp:3525
#34 0x0804bfd7 in main (argc=3, argv=0xbfeb0f94) at /var/tmp/portage/kde-base/kontact-4.2.96/work/kontact-4.2.96/kontact/src/main.cpp:218

Reported using DrKonqi