Application that crashed: kontact
Version of the application: 4.3.4
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.3
Operating System: Linux 2.6.32-3-686 i686
Distribution: Debian GNU/Linux unstable (sid)

What I was doing when the application crashed:
Using the keyboard, I opened (in its own window) one email with the [Enter] key, hit the left arrow to move up to another email, and hit [Enter] again before the first email's window was launched.  KMail and Kontact crashed.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  QList (this=<value optimized out>) at /usr/include/qt4/QtCore/qlist.h:111
#7  KMail::FolderJob::msgList (this=<value optimized out>) at ../../kmail/folderjob.cpp:120
#8  0x48226e5d in KMAcctImap::ignoreJobsForMessage (this=<value optimized out>, msg=<value optimized out>) at ../../kmail/kmacctimap.cpp:217
#9  0x4823dab3 in KMFolderImap::ignoreJobsForMessage (this=) at ../../kmail/kmfolderimap.cpp:1564
#10 0x4815d04b in KMFolder::ignoreJobsForMessage (this=) at ../../kmail/kmfolder.cpp:388
#11 0x483564d4 in KMCommand::transferSelectedMsgs (this=<value optimized out>) at ../../kmail/kmcommands.cpp:334
#12 0x48356a92 in KMCommand::slotStart (this=<value optimized out>) at ../../kmail/kmcommands.cpp:266
#13 0x48346d5b in KMCommand::qt_metacall (this=<value optimized out>, _c=<value optimized out>, _id=<value optimized out>, _a=<value optimized out>) at ./kmcommands.moc:86
#14 0x48347402 in KMReplyToCommand::qt_metacall (this=) at ./kmcommands.moc:844
#15 0x49226963 in QMetaObject::activate (sender=<value optimized out>, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=<value optimized out>)
    at kernel/qobject.cpp:3112
#16 0x492275a2 in QMetaObject::activate (sender=<value optimized out>, m=<value optimized out>, local_signal_index=<value optimized out>, argv=) at kernel/qobject.cpp:3186
#17 0x4922c667 in QSingleShotTimer::timeout (this=) at .moc/release-shared/qtimer.moc:76
#18 0x4922c78c in QSingleShotTimer::timerEvent (this=<value optimized out>) at kernel/qtimer.cpp:298
#19 0x492219ff in QObject::event (this=<value optimized out>, e=<value optimized out>) at kernel/qobject.cpp:1074
#20 0x45a97a34 in QApplicationPrivate::notify_helper (this=<value optimized out>, receiver=<value optimized out>, e=<value optimized out>) at kernel/qapplication.cpp:4065
#21 0x45a9fb8e in QApplication::notify (this=<value optimized out>, receiver=<value optimized out>, e=<value optimized out>) at kernel/qapplication.cpp:3605
#22 0x465d1e2a in KApplication::notify (this=<value optimized out>, receiver=<value optimized out>, event=<value optimized out>) at ../../kdeui/kernel/kapplication.cpp:302
#23 0x4921184b in QCoreApplication::notifyInternal (this=<value optimized out>, receiver=<value optimized out>, event=<value optimized out>) at kernel/qcoreapplication.cpp:610
#24 0x49240481 in QCoreApplication::sendEvent (this=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#25 QTimerInfoList::activateTimers (this=<value optimized out>) at kernel/qeventdispatcher_unix.cpp:580
#26 0x4923c977 in timerSourceDispatch (source=) at kernel/qeventdispatcher_glib.cpp:184
#27 idleTimerSourceDispatch (source=) at kernel/qeventdispatcher_glib.cpp:231
#28 0x48cb3b38 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#29 0x48cb73d0 in ?? () from /lib/libglib-2.0.so.0
#30 0x48cb7503 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#31 0x4923c6a1 in QEventDispatcherGlib::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:407
#32 0x45b372a5 in QGuiEventDispatcherGlib::processEvents (this=) at kernel/qguieventdispatcher_glib.cpp:202
#33 0x4920fe9a in QEventLoop::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventloop.cpp:149
#34 0x492102e2 in QEventLoop::exec (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventloop.cpp:201
#35 0x49212739 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#36 0x45a978b7 in QApplication::exec () at kernel/qapplication.cpp:3525
#37 0x0804b4c6 in main (argc=3, argv=0xbf837544) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi