Application that crashed: kmail
Version of the application: 1.12.1
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-11-generic i686
Distribution: Ubuntu karmic (development branch)

What I was doing when the application crashed:
I've opened my gmail account with KMail, move some mails out of the spam folder, then moved the last one in this folder (which took some time).
While it was still moving, I've selected the messages above (~20 maybe) and pressed "f", because I wanted to forward them.
KMail then crashed.

 -- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[KCrash Handler]
#6  QList (this=0x49) at /usr/include/qt4/QtCore/qlist.h:111
#7  KMail::FolderJob::msgList (this=0x49) at ../../kmail/folderjob.cpp:120
#8  0x00e5971d in KMAcctImap::ignoreJobsForMessage (this=0x8536d18, msg=0x9d12178) at ../../kmail/kmacctimap.cpp:215
#9  0x00e70aa3 in KMFolderImap::ignoreJobsForMessage (this=0x8baee58, msg=0x9d12178) at ../../kmail/kmfolderimap.cpp:1564
#10 0x00d8eaeb in KMFolder::ignoreJobsForMessage (this=0x8ba4bd0, m=0x9d12178) at ../../kmail/kmfolder.cpp:393
#11 0x00f88354 in KMCommand::transferSelectedMsgs (this=0x96d8868) at ../../kmail/kmcommands.cpp:334
#12 0x00f88912 in KMCommand::slotStart (this=0x96d8868) at ../../kmail/kmcommands.cpp:266
#13 0x00f794bb in KMCommand::qt_metacall (this=0x96d8868, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbf967d1c) at ./kmcommands.moc:86
#14 0x00f799e2 in KMForwardAttachedCommand::qt_metacall (this=0x96d8868, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbf967d1c) at ./kmcommands.moc:1102
#15 0x055f2253 in QMetaObject::activate (sender=0x96d8360, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#16 0x055f2eb2 in QMetaObject::activate (sender=0x96d8360, m=0x56cd908, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#17 0x055f7377 in QSingleShotTimer::timeout (this=0x96d8360) at .moc/release-shared/qtimer.moc:76
#18 0x055f748c in QSingleShotTimer::timerEvent (this=0x96d8360) at kernel/qtimer.cpp:298
#19 0x055ec3af in QObject::event (this=0x96d8360, e=0xbf9681b0) at kernel/qobject.cpp:1075
#20 0x01f73f44 in QApplicationPrivate::notify_helper (this=0x82e9fb0, receiver=0x96d8360, e=0xbf9681b0) at kernel/qapplication.cpp:4056
#21 0x01f7b66c in QApplication::notify (this=0xbf9685a0, receiver=0x96d8360, e=0xbf9681b0) at kernel/qapplication.cpp:3603
#22 0x00369f8a in KApplication::notify (this=0xbf9685a0, receiver=0x96d8360, event=0xbf9681b0) at ../../kdeui/kernel/kapplication.cpp:302
#23 0x055dc6bb in QCoreApplication::notifyInternal (this=0xbf9685a0, receiver=0x96d8360, event=0xbf9681b0) at kernel/qcoreapplication.cpp:610
#24 0x056097be in QCoreApplication::sendEvent (this=0x82ee29c) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#25 QTimerInfoList::activateTimers (this=0x82ee29c) at kernel/qeventdispatcher_unix.cpp:572
#26 0x056070d0 in timerSourceDispatch (source=0x82ee268) at kernel/qeventdispatcher_glib.cpp:165
#27 0x02bd4e78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#28 0x02bd8720 in ?? () from /lib/libglib-2.0.so.0
#29 0x02bd8853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#30 0x0560701c in QEventDispatcherGlib::processEvents (this=0x82b6180, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#31 0x02014ad5 in QGuiEventDispatcherGlib::processEvents (this=0x82b6180, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#32 0x055dac69 in QEventLoop::processEvents (this=0xbf968474, flags=) at kernel/qeventloop.cpp:149
#33 0x055db0ba in QEventLoop::exec (this=0xbf968474, flags=...) at kernel/qeventloop.cpp:201
#34 0x055dd52f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#35 0x01f73dc7 in QApplication::exec () at kernel/qapplication.cpp:3525
#36 0x0804a702 in main (argc=3, argv=0xbf968754) at ../../kmail/main.cpp:146

Reported using DrKonqi