Application that crashed: kmail
Version of the application: 1.12.3
KDE Version: 4.3.3 (KDE 4.3.3)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-14-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I was trying to delete three mails. 2 of them were gpg encrypted. 1 was plain. I selected them. GPG dialog came up. I closed it be pressing ESC and than i hit the DEL key.
-> crash

 -- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[KCrash Handler]
#6  0x005893d4 in QListData::shared_null () from /usr/lib/libQtCore.so.4
#7  0x00eee362 in KMReaderWin::parseMsg (this=0x9361ea8, aMsg=0xa579040) at ../../kmail/kmreaderwin.cpp:1688
#8  0x00edb6c9 in KMReaderWin::displayMessage (this=0x9361ea8) at ../../kmail/kmreaderwin.cpp:1608
#9  0x00edb8bb in KMReaderWin::updateReaderWin (this=0x9361ea8) at ../../kmail/kmreaderwin.cpp:1548
#10 0x00eea468 in KMReaderWin::update (this=0x9361ea8, observable=0xa7846b8) at ../../kmail/kmreaderwin.cpp:950
#11 0x0113eec2 in KMail::ISubject::notify (this=0xa5790b0) at ../../kmail/isubject.cpp:33
#12 0x00ddcf12 in KMMessage::updateBodyPart (this=0xa579040, partSpecifier=..., data=...) at ../../kmail/kmmessage.cpp:3237
#13 0x0110ff10 in KMail::ImapJob::slotGetMessageResult (this=0xa80ac08, job=0xa2fe8d8) at ../../kmail/imapjob.cpp:435
#14 0x0111474f in KMail::ImapJob::qt_metacall (this=0xa80ac08, _c=QMetaObject::InvokeMetaMethod, _id=12, _a=0xbff46628) at ./imapjob.moc:82
#15 0x004ad263 in QMetaObject::activate (sender=0xa2fe8d8, from_signal_index=7, to_signal_index=7, argv=0xbff46628) at kernel/qobject.cpp:3113
#16 0x004adec2 in QMetaObject::activate (sender=0xa2fe8d8, m=0x34fd68, local_signal_index=3, argv=0xbff46628) at kernel/qobject.cpp:3187
#17 0x001e9ff3 in KJob::result (this=0xa2fe8d8, _t1=0xa2fe8d8) at ./kjob.moc:188
#18 0x001ea479 in KJob::emitResult (this=0xa2fe8d8) at ../../kdecore/jobs/kjob.cpp:304
#19 0x016bb7b0 in KIO::SimpleJob::slotFinished (this=0xa2fe8d8) at ../../kio/kio/job.cpp:477
#20 0x016bbcca in KIO::TransferJob::slotFinished (this=0xa2fe8d8) at ../../kio/kio/job.cpp:948
#21 0x016b99f3 in KIO::TransferJob::qt_metacall (this=0xa2fe8d8, _c=QMetaObject::InvokeMetaMethod, _id=47, _a=0xbff4688c) at ./jobclasses.moc:343
#22 0x004ad263 in QMetaObject::activate (sender=0x9bef9c0, from_signal_index=8, to_signal_index=8, argv=0x0) at kernel/qobject.cpp:3113
#23 0x004adec2 in QMetaObject::activate (sender=0x9bef9c0, m=0x186df64, local_signal_index=4, argv=0x0) at kernel/qobject.cpp:3187
#24 0x017856a7 in KIO::SlaveInterface::finished (this=0x9bef9c0) at ./slaveinterface.moc:165
#25 0x0178959d in KIO::SlaveInterface::dispatch (this=0x9bef9c0, _cmd=104, rawdata=...) at ../../kio/kio/slaveinterface.cpp:175
#26 0x01785b63 in KIO::SlaveInterface::dispatch (this=0x9bef9c0) at ../../kio/kio/slaveinterface.cpp:91
#27 0x01777c3a in KIO::Slave::gotInput (this=0x9bef9c0) at ../../kio/kio/slave.cpp:322
#28 0x0177a033 in KIO::Slave::qt_metacall (this=0x9bef9c0, _c=QMetaObject::InvokeMetaMethod, _id=30, _a=0xbff46b6c) at ./slave.moc:76
#29 0x004ad263 in QMetaObject::activate (sender=0x9e44828, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#30 0x004adec2 in QMetaObject::activate (sender=0x9e44828, m=0x186a8a0, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#31 0x01682057 in KIO::Connection::readyRead (this=0x9e44828) at ./connection.moc:86
#32 0x01683e1e in KIO::ConnectionPrivate::dequeue (this=0xa303510) at ../../kio/kio/connection.cpp:82
#33 0x01683f4e in KIO::Connection::qt_metacall (this=0x9e44828, _c=QMetaObject::InvokeMetaMethod, _id=5, _a=0x9acfb60) at ./connection.moc:73
#34 0x004a5f0b in QMetaCallEvent::placeMetaCall (this=0x99e1758, object=0x9e44828) at kernel/qobject.cpp:477
#35 0x004a75fe in QObject::event (this=0x9e44828, e=0x99e1758) at kernel/qobject.cpp:1111
#36 0x0324bf54 in QApplicationPrivate::notify_helper (this=0x9237018, receiver=0x9e44828, e=0x99e1758) at kernel/qapplication.cpp:4056
#37 0x0325367c in QApplication::notify (this=0xbff474a0, receiver=0x9e44828, e=0x99e1758) at kernel/qapplication.cpp:3603
#38 0x00b5914a in KApplication::notify (this=0xbff474a0, receiver=0x9e44828, event=0x99e1758) at ../../kdeui/kernel/kapplication.cpp:302
#39 0x004976cb in QCoreApplication::notifyInternal (this=0xbff474a0, receiver=0x9e44828, event=0x99e1758) at kernel/qcoreapplication.cpp:610
#40 0x004982b2 in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x91e93d0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#41 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x91e93d0) at kernel/qcoreapplication.cpp:1247
#42 0x0049847d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1140
#43 0x004c23ff in QCoreApplication::sendPostedEvents (s=0x920c1a8) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#44 postEventSourceDispatch (s=0x920c1a8) at kernel/qeventdispatcher_glib.cpp:210
#45 0x02945e78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#46 0x02949720 in ?? () from /lib/libglib-2.0.so.0
#47 0x02949853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#48 0x004c202c in QEventDispatcherGlib::processEvents (this=0x9205a50, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#49 0x032ecbe5 in QGuiEventDispatcherGlib::processEvents (this=0x9205a50, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#50 0x00495c79 in QEventLoop::processEvents (this=0xbff47364, flags=) at kernel/qeventloop.cpp:149
#51 0x004960ca in QEventLoop::exec (this=0xbff47364, flags=...) at kernel/qeventloop.cpp:201
#52 0x0049853f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#53 0x0324bdd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#54 0x0804a702 in main (argc=3, argv=0xbff47654) at ../../kmail/main.cpp:146

Reported using DrKonqi