Application that crashed: kontact
Version of the application: 4.3.1
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-rc9-sidux-686 i686
Distribution: Debian GNU/Linux unstable (sid)

What I was doing when the application crashed:
I had a gpg encrypted message in the sending folder. When opening the Folder the message is displayed an a pinentry window pops up for the password. While entering the password the message is successfully sended an after hitting the enter-Buttom kmail crashes, because the message isn't there anymore.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  0xb745b86b in QTreeWidgetItem::addChild (this=0x9a492a8, child=0x9627c88) at itemviews/qtreewidget.cpp:1876
#7  0xb745bce0 in QTreeWidgetItem (this=0x9627c88, parent=0x9a492a8, type=0) at itemviews/qtreewidget.cpp:1424
#8  0xb144a3d1 in KMMimePartTreeItem (this=0x9627c88, parent=0x9a492a8, node=0x99997b8, description=..., mimetype=..., encoding=..., size=1713, revertOrder=false)
    at ../../kmail/kmmimeparttree.cpp:378
#9  0xb148e2ce in partNode::fillMimePartTree (this=0x99997b8, parentItem=0x9a492a8, mimePartTree=0x0, labelDescr=..., labelCntType=..., labelEncoding=..., size=0, revertOrder=<value optimized out>)
    at ../../kmail/partNode.cpp:496
#10 0xb147b1b5 in KMail::ObjectTreeParser::insertAndParseNewChildNode (this=0xbf9ac3fc, startNode=..., 
    content=0x8f61280 "Content-Type: multipart/signed;\r\n  boundary=\"nextPart3393709.0i91aAKlds\";\r\n  protocol=\"application/pgp-signature\";\r\n  micalg=pgp-sha1\r\nContent-Transfer-Encoding: 7bit\r\n\r\n--nextPart3393709.0i91aAKlds\r\n"..., cntDesc=0xb17a588b "encrypted data", append=<value optimized out>) at ../../kmail/objecttreeparser.cpp:222
#11 0xb148694e in KMail::ObjectTreeParser::processMultiPartEncryptedSubtype (this=0xbf9ac3fc, node=0x96b1b38, result=...) at ../../kmail/objecttreeparser.cpp:1366
#12 0xb1488e2b in process (this=0x965ff68, otp=0xbf9ac3fc, node=0x96b1b38, result=...) at ../../kmail/bodypartformatter.cpp:121
#13 0xb147a09e in KMail::ObjectTreeParser::parseObjectTree (this=0xbf9ac3fc, node=0x96b1b38) at ../../kmail/objecttreeparser.cpp:293
#14 0xb12e5647 in KMReaderWin::parseMsg (this=0x899a0f8, aMsg=0x8d4e348) at ../../kmail/kmreaderwin.cpp:1672
#15 0xb12d3a0b in KMReaderWin::displayMessage (this=0x899a0f8) at ../../kmail/kmreaderwin.cpp:1605
#16 0xb12d3c20 in KMReaderWin::updateReaderWin (this=0x899a0f8) at ../../kmail/kmreaderwin.cpp:1545
#17 0xb12e0647 in KMReaderWin::qt_metacall (this=0x899a0f8, _c=QMetaObject::InvokeMetaMethod, _id=6, _a=0xbf9ac718) at ./kmreaderwin.moc:168
#18 0xb786fb33 in QMetaObject::activate (sender=0x899a150, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3112
#19 0xb7870782 in QMetaObject::activate (sender=0x899a150, m=0xb794bde4, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3186
#20 0xb78ab177 in QTimer::timeout (this=0x899a150) at .moc/release-shared/moc_qtimer.cpp:128
#21 0xb7875e9e in QTimer::timerEvent (this=0x899a150, e=0xbf9acb9c) at kernel/qtimer.cpp:261
#22 0xb786abcf in QObject::event (this=0x899a150, e=0xbf9acb9c) at kernel/qobject.cpp:1074
#23 0xb6e9a814 in QApplicationPrivate::notify_helper (this=0x82d5398, receiver=0x899a150, e=0xbf9acb9c) at kernel/qapplication.cpp:4056
#24 0xb6ea297e in QApplication::notify (this=0xbf9acf4c, receiver=0x899a150, e=0xbf9acb9c) at kernel/qapplication.cpp:3603
#25 0xb7d5b4ad in KApplication::notify (this=0xbf9acf4c, receiver=0x899a150, event=0xbf9acb9c) at ../../kdeui/kernel/kapplication.cpp:302
#26 0xb785a9cb in QCoreApplication::notifyInternal (this=0xbf9acf4c, receiver=0x899a150, event=0xbf9acb9c) at kernel/qcoreapplication.cpp:610
#27 0xb7889361 in QCoreApplication::sendEvent (this=0x82ce174) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#28 QTimerInfoList::activateTimers (this=0x82ce174) at kernel/qeventdispatcher_unix.cpp:572
#29 0xb7885900 in timerSourceDispatch (source=0x82ce140) at kernel/qeventdispatcher_glib.cpp:165
#30 0xb52b4e98 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#31 0xb52b8623 in ?? () from /lib/libglib-2.0.so.0
#32 0xb52b87a8 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#33 0xb7885858 in QEventDispatcherGlib::processEvents (this=0x82ad6e8, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#34 0xb6f39fd5 in QGuiEventDispatcherGlib::processEvents (this=0x82ad6e8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#35 0xb785901a in QEventLoop::processEvents (this=0xbf9acdc0, flags=...) at kernel/qeventloop.cpp:149
#36 0xb7859462 in QEventLoop::exec (this=0xbf9acdc0, flags=...) at kernel/qeventloop.cpp:201
#37 0xb785b8b9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#38 0xb6e9a697 in QApplication::exec () at kernel/qapplication.cpp:3525
#39 0x0804bd40 in main (argc=3, argv=0xbf9ad144) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi