Application that crashed: kontact
Version of the application: 4.3.2
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-17-generic x86_64
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I was in the spam folder of my IMAP'd Gmail account, highlighted all the messages and pushed the Delete key.  That's when the crash happened. 
*Kubuntu 9.10

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
The current source language is "auto; currently c".
[KCrash Handler]
#5  QBasicAtomicInt::ref (this=0x2223ca0) at /usr/include/qt4/QtCore/qatomic_x86_64.h:121
#6  QList (this=0x2223ca0) at /usr/include/qt4/QtCore/qlist.h:111
#7  KMail::FolderJob::msgList (this=0x2223ca0) at ../../kmail/folderjob.cpp:120
#8  0x00007f2f71a26c23 in KMAcctImap::ignoreJobsForMessage (this=0x12d4e70, msg=0x26e8ea0) at ../../kmail/kmacctimap.cpp:215
#9  0x00007f2f71b40727 in KMMoveCommand::execute (this=0x2f2b650) at ../../kmail/kmcommands.cpp:2095
#10 0x00007f2f71b262ca in KMCommand::slotPostTransfer (this=0x2f2b650, result=KMCommand::OK) at ../../kmail/kmcommands.cpp:274
#11 0x00007f2f71b304d3 in KMCommand::qt_metacall (this=0x2f2b650, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff507f6900) at ./kmcommands.moc:87
#12 0x00007f2f71b41810 in KMMoveCommand::qt_metacall (this=0x7fff507f6490, _c=35798176, _id=7, _a=0x2bc8110) at ./kmcommands.moc:1706
#13 0x00007f2f874f3ddc in QMetaObject::activate (sender=0x2f2b650, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x2bc8110) at kernel/qobject.cpp:3113
#14 0x00007f2f71b2344e in KMCommand::messagesTransfered (this=0x7fff507f6490, _t1=KMCommand::OK) at ./kmcommands.moc:102
#15 0x00007f2f71b3e648 in KMCommand::transferSelectedMsgs (this=0x2f2b650) at ../../kmail/kmcommands.cpp:368
#16 0x00007f2f71b3e86f in KMCommand::slotStart (this=0x2f2b650) at ../../kmail/kmcommands.cpp:266
#17 0x00007f2f71b304b6 in KMCommand::qt_metacall (this=0x2f2b650, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff507f6b60) at ./kmcommands.moc:86
#18 0x00007f2f71b41810 in KMMoveCommand::qt_metacall (this=0x7fff507f6490, _c=35798176, _id=7, _a=0x2bc8110) at ./kmcommands.moc:1706
#19 0x00007f2f874f3ddc in QMetaObject::activate (sender=0x25e4520, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x2bc8110) at kernel/qobject.cpp:3113
#20 0x00007f2f874f8e1f in QSingleShotTimer::timerEvent (this=0x25e4520) at kernel/qtimer.cpp:298
#21 0x00007f2f874edd83 in QObject::event (this=0x25e4520, e=0x2223ca0) at kernel/qobject.cpp:1075
#22 0x00007f2f87dfeefc in QApplicationPrivate::notify_helper (this=0xc945c0, receiver=0x25e4520, e=0x7fff507f7170) at kernel/qapplication.cpp:4056
#23 0x00007f2f87e061ce in QApplication::notify (this=0x7fff507f74d0, receiver=0x25e4520, e=0x7fff507f7170) at kernel/qapplication.cpp:4021
#24 0x00007f2f88a35ab6 in KApplication::notify (this=0x7fff507f74d0, receiver=0x25e4520, event=0x7fff507f7170) at ../../kdeui/kernel/kapplication.cpp:302
#25 0x00007f2f874dec2c in QCoreApplication::notifyInternal (this=0x7fff507f74d0, receiver=0x25e4520, event=0x7fff507f7170) at kernel/qcoreapplication.cpp:610
#26 0x00007f2f87509862 in QCoreApplication::sendEvent (this=0xc8dda0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#27 QTimerInfoList::activateTimers (this=0xc8dda0) at kernel/qeventdispatcher_unix.cpp:572
#28 0x00007f2f8750725d in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:165
#29 0x00007f2f80d58bce in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#30 0x00007f2f80d5c598 in ?? () from /lib/libglib-2.0.so.0
#31 0x00007f2f80d5c6c0 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#32 0x00007f2f875071a6 in QEventDispatcherGlib::processEvents (this=0xc62cb0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#33 0x00007f2f87e934be in QGuiEventDispatcherGlib::processEvents (this=0x7fff507f6490, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#34 0x00007f2f874dd532 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#35 0x00007f2f874dd904 in QEventLoop::exec (this=0x7fff507f7410, flags=) at kernel/qeventloop.cpp:201
#36 0x00007f2f874dfab9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#37 0x0000000000403f47 in main (argc=<value optimized out>, argv=<value optimized out>) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi