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 2.6.31-15-generic x86_64
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I had saved a draft of an email, not much there.  I then saved it as a patch file in /tmp.  when I tried to view the email again from the draft folder Kmail became unresponsive.  I killed it and when it came back the email was still in the draft folder, but I couldn't view it.  I went to delete it, and after many unsuccessful tries kmail eventually cored.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#5  0x00007f2868e2f0c0 in ?? () from /usr/lib/libkmailprivate.so.4
#6  0x00007f2868fe8379 in KMSaveMsgCommand::slotSaveDataReq() () from /usr/lib/libkmailprivate.so.4
#7  0x00007f2868ff8ba7 in KMSaveMsgCommand::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkmailprivate.so.4
#8  0x00007f287e814ddc in QMetaObject::activate (sender=0x43d0250, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0xc005) at kernel/qobject.cpp:3113
#9  0x00007f287cc6e337 in KIO::TransferJob::dataReq (this=0x0, _t1=0x43d0250, _t2=<value optimized out>) at ./jobclasses.moc:371
#10 0x00007f287cc70993 in KIO::TransferJob::slotDataReq (this=0x43d0250) at ../../kio/kio/job.cpp:1065
#11 0x00007f287cc73c41 in KIO::TransferJob::qt_metacall (this=0x43d0250, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff64d00030) at ./jobclasses.moc:345
#12 0x00007f287e814ddc in QMetaObject::activate (sender=0x2990fa0, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0xc005) at kernel/qobject.cpp:3113
#13 0x00007f287cd35c4d in KIO::SlaveInterface::dispatch (this=0x2990fa0, _cmd=101, rawdata=...) at ../../kio/kio/slaveinterface.cpp:166
#14 0x00007f287cd323e3 in KIO::SlaveInterface::dispatch (this=0x2990fa0) at ../../kio/kio/slaveinterface.cpp:91
#15 0x00007f287cd251fd in KIO::Slave::gotInput (this=0x2990fa0) at ../../kio/kio/slave.cpp:322
#16 0x00007f287cd2731c in KIO::Slave::qt_metacall (this=0x2990fa0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff64d003f0) at ./slave.moc:76
#17 0x00007f287e814ddc in QMetaObject::activate (sender=0x29919c0, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0xc005) at kernel/qobject.cpp:3113
#18 0x00007f287cc41f77 in KIO::ConnectionPrivate::dequeue (this=0x2991940) at ../../kio/kio/connection.cpp:82
#19 0x00007f287cc4209d in KIO::Connection::qt_metacall (this=0x29919c0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x4531b10) at ./connection.moc:73
#20 0x00007f287e80f0f9 in QObject::event (this=0x29919c0, e=0x438b680) at kernel/qobject.cpp:1111
#21 0x00007f287f11fefc in QApplicationPrivate::notify_helper (this=0x16333a0, receiver=0x29919c0, e=0x438b680) at kernel/qapplication.cpp:4056
#22 0x00007f287f1271ce in QApplication::notify (this=0x7fff64d00db0, receiver=0x29919c0, e=0x438b680) at kernel/qapplication.cpp:4021
#23 0x00007f287fd56e56 in KApplication::notify (this=0x7fff64d00db0, receiver=0x29919c0, event=0x438b680) at ../../kdeui/kernel/kapplication.cpp:302
#24 0x00007f287e7ffc2c in QCoreApplication::notifyInternal (this=0x7fff64d00db0, receiver=0x29919c0, event=0x438b680) at kernel/qcoreapplication.cpp:610
#25 0x00007f287e80080a in QCoreApplication::sendEvent (receiver=0x0, event_type=<value optimized out>, data=0x15f08f0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#26 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=<value optimized out>, data=0x15f08f0) at kernel/qcoreapplication.cpp:1247
#27 0x00007f287e828533 in QCoreApplication::sendPostedEvents (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#28 postEventSourceDispatch (s=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:210
#29 0x00007f287807abbe in g_main_dispatch (context=0x1624a40) at /build/buildd/glib2.0-2.22.2/glib/gmain.c:1960
#30 IA__g_main_context_dispatch (context=0x1624a40) at /build/buildd/glib2.0-2.22.2/glib/gmain.c:2513
#31 0x00007f287807e588 in g_main_context_iterate (context=0x1624a40, block=<value optimized out>, dispatch=<value optimized out>, self=<value optimized out>)
    at /build/buildd/glib2.0-2.22.2/glib/gmain.c:2591
#32 0x00007f287807e6b0 in IA__g_main_context_iteration (context=0x1624a40, may_block=1) at /build/buildd/glib2.0-2.22.2/glib/gmain.c:2654
#33 0x00007f287e8281a6 in QEventDispatcherGlib::processEvents (this=0x161de60, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#34 0x00007f287f1b44be in QGuiEventDispatcherGlib::processEvents (this=0x0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#35 0x00007f287e7fe532 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#36 0x00007f287e7fe904 in QEventLoop::exec (this=0x7fff64d00cf0, flags=) at kernel/qeventloop.cpp:201
#37 0x00007f287e800ab9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#38 0x0000000000403f47 in _start ()

Reported using DrKonqi