Application that crashed: kontact
Version of the application: 4.3.3
KDE Version: 4.3.3 (KDE 4.3.3)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-14-generic-pae i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I have a large number of messages in the folder, the filter still had about 2500 left to go through, and was clicking through some new messages.  I deleted a couple without issue, then immediately after I deleted one it crashed.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  QBasicAtomicInt::ref (this=0xd6cba00) at /usr/include/qt4/QtCore/qatomic_i386.h:120
#7  QList (this=0xd6cba00) at /usr/include/qt4/QtCore/qlist.h:111
#8  KMail::FolderJob::msgList (this=0xd6cba00) at ../../kmail/folderjob.cpp:120
#9  0xaf7987cd in KMAcctImap::ignoreJobsForMessage (this=0xa52d330, msg=0x102a5ba8) at ../../kmail/kmacctimap.cpp:215
#10 0xaf7afb53 in KMFolderImap::ignoreJobsForMessage (this=0xa4e9f50, msg=0x102a5ba8) at ../../kmail/kmfolderimap.cpp:1564
#11 0xaf8ca49c in KMMoveCommand::execute (this=0x1087b190) at ../../kmail/kmcommands.cpp:2095
#12 0xaf8aece2 in KMCommand::slotPostTransfer (this=0x1087b190, result=KMCommand::OK) at ../../kmail/kmcommands.cpp:274
#13 0xaf8b929f in KMCommand::qt_metacall (this=0x1087b190, _c=QMetaObject::InvokeMetaMethod, _id=9, _a=0xbfd84ca8) at ./kmcommands.moc:87
#14 0xaf8cb73a in KMMoveCommand::qt_metacall (this=0x1087b190, _c=QMetaObject::InvokeMetaMethod, _id=9, _a=0xbfd84ca8) at ./kmcommands.moc:1706
#15 0xb65a7263 in QMetaObject::activate (sender=0x1087b190, from_signal_index=4, to_signal_index=4, argv=0xbfd84ca8) at kernel/qobject.cpp:3113
#16 0xb65a7ec2 in QMetaObject::activate (sender=0x1087b190, m=0xafce7634, local_signal_index=0, argv=0xbfd84ca8) at kernel/qobject.cpp:3187
#17 0xaf8aad13 in KMCommand::messagesTransfered (this=0x1087b190, _t1=KMCommand::OK) at ./kmcommands.moc:102
#18 0xaf8c8296 in KMCommand::transferSelectedMsgs (this=0x1087b190) at ../../kmail/kmcommands.cpp:368
#19 0xaf8c84e2 in KMCommand::slotStart (this=0x1087b190) at ../../kmail/kmcommands.cpp:266
#20 0xaf8b927b in KMCommand::qt_metacall (this=0x1087b190, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbfd84eac) at ./kmcommands.moc:86
#21 0xaf8cb73a in KMMoveCommand::qt_metacall (this=0x1087b190, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbfd84eac) at ./kmcommands.moc:1706
#22 0xb65a7263 in QMetaObject::activate (sender=0x102a68c8, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#23 0xb65a7ec2 in QMetaObject::activate (sender=0x102a68c8, m=0xb6681908, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#24 0xb65ac387 in QSingleShotTimer::timeout (this=0x102a68c8) at .moc/release-shared/qtimer.moc:76
#25 0xb65ac49c in QSingleShotTimer::timerEvent (this=0x102a68c8) at kernel/qtimer.cpp:298
#26 0xb65a13bf in QObject::event (this=0x102a68c8, e=0xbfd85340) at kernel/qobject.cpp:1075
#27 0xb69edf54 in QApplicationPrivate::notify_helper (this=0x9f963f8, receiver=0x102a68c8, e=0xbfd85340) at kernel/qapplication.cpp:4056
#28 0xb69f567c in QApplication::notify (this=0xbfd856a4, receiver=0x102a68c8, e=0xbfd85340) at kernel/qapplication.cpp:3603
#29 0xb743e14a in KApplication::notify (this=0xbfd856a4, receiver=0x102a68c8, event=0xbfd85340) at ../../kdeui/kernel/kapplication.cpp:302
#30 0xb65916cb in QCoreApplication::notifyInternal (this=0xbfd856a4, receiver=0x102a68c8, event=0xbfd85340) at kernel/qcoreapplication.cpp:610
#31 0xb65be7ce in QCoreApplication::sendEvent (this=0x9f912b4) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#32 QTimerInfoList::activateTimers (this=0x9f912b4) at kernel/qeventdispatcher_unix.cpp:572
#33 0xb65bc0e0 in timerSourceDispatch (source=0x9f91280) at kernel/qeventdispatcher_glib.cpp:165
#34 0xb48bae78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#35 0xb48be720 in ?? () from /lib/libglib-2.0.so.0
#36 0xb48be853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#37 0xb65bc02c in QEventDispatcherGlib::processEvents (this=0x9f6e9f8, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#38 0xb6a8ebe5 in QGuiEventDispatcherGlib::processEvents (this=0x9f6e9f8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#39 0xb658fc79 in QEventLoop::processEvents (this=0xbfd85604, flags=) at kernel/qeventloop.cpp:149
#40 0xb65900ca in QEventLoop::exec (this=0xbfd85604, flags=...) at kernel/qeventloop.cpp:201
#41 0xb659253f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#42 0xb69eddd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#43 0x0804b4e6 in main (argc=1, argv=0xbfd858c4) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi