Application that crashed: kontact
Version of the application: 4.3.5
KDE Version: 4.3.5 (KDE 4.3.5)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-17-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
As above. This hasn't happened before, though am now running 4.3.5

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[Current thread is 1 (Thread 0xb77fc700 (LWP 1732))]

Thread 2 (Thread 0xaad78b70 (LWP 10363)):
#0  0x00ccb422 in __kernel_vsyscall ()
#1  0x00d1de15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x00e5587d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x0207ae67 in QWaitConditionPrivate::wait (this=0x8ed6848, mutex=0x8ed6844, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0x8ed6848, mutex=0x8ed6844, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0x01ba3922 in QHostInfoAgent::run (this=0x8ed6838) at kernel/qhostinfo.cpp:260
#6  0x02079e32 in QThreadPrivate::start (arg=0x8ed6838) at thread/qthread_unix.cpp:188
#7  0x00d1980e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0x00e488de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb77fc700 (LWP 1732)):
[KCrash Handler]
#6  0x004d004e in vtable for KCMultiDialog () from /usr/lib/libkutils.so.4
#7  0xb44b0e8c in KMMessage::replaceHeadersInString (this=0xb712750, s=...) at ../../kmail/kmmessage.cpp:1303
#8  0xb44c3b53 in KMMessage::createMDN (this=0xb712750, a=KMime::MDN::ManualAction, d=KMime::MDN::Displayed, allowGUI=true, m=...) at ../../kmail/kmmessage.cpp:1222
#9  0xb45b0397 in KMReaderWin::slotTouchMessage (this=0x8fcff48) at ../../kmail/kmreaderwin.cpp:1956
#10 0xb45c51f9 in KMReaderWin::qt_metacall (this=0x8fcff48, _c=QMetaObject::InvokeMetaMethod, _id=36, _a=0xbff44c8c) at ./kmreaderwin.moc:198
#11 0x02180263 in QMetaObject::activate (sender=0x8fcffd0, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#12 0x02180ec2 in QMetaObject::activate (sender=0x8fcffd0, m=0x225b904, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#13 0x021ba667 in QTimer::timeout (this=0x8fcffd0) at .moc/release-shared/moc_qtimer.cpp:128
#14 0x021859ae in QTimer::timerEvent (this=0x8fcffd0, e=0xbff45120) at kernel/qtimer.cpp:261
#15 0x0217a3bf in QObject::event (this=0x8fcffd0, e=0xbff45120) at kernel/qobject.cpp:1075
#16 0x0102df54 in QApplicationPrivate::notify_helper (this=0x88be438, receiver=0x8fcffd0, e=0xbff45120) at kernel/qapplication.cpp:4056
#17 0x0103567c in QApplication::notify (this=0xbff45484, receiver=0x8fcffd0, e=0xbff45120) at kernel/qapplication.cpp:3603
#18 0x0091525a in KApplication::notify (this=0xbff45484, receiver=0x8fcffd0, event=0xbff45120) at ../../kdeui/kernel/kapplication.cpp:302
#19 0x0216a6cb in QCoreApplication::notifyInternal (this=0xbff45484, receiver=0x8fcffd0, event=0xbff45120) at kernel/qcoreapplication.cpp:610
#20 0x021977ce in QCoreApplication::sendEvent (this=0x88ad774) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#21 QTimerInfoList::activateTimers (this=0x88ad774) at kernel/qeventdispatcher_unix.cpp:572
#22 0x021950e0 in timerSourceDispatch (source=0x88ad740) at kernel/qeventdispatcher_glib.cpp:165
#23 0x0426ae88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#24 0x0426e730 in ?? () from /lib/libglib-2.0.so.0
#25 0x0426e863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#26 0x0219502c in QEventDispatcherGlib::processEvents (this=0x888c9f8, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#27 0x010cebe5 in QGuiEventDispatcherGlib::processEvents (this=0x888c9f8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#28 0x02168c79 in QEventLoop::processEvents (this=0xbff453e4, flags=) at kernel/qeventloop.cpp:149
#29 0x021690ca in QEventLoop::exec (this=0xbff453e4, flags=...) at kernel/qeventloop.cpp:201
#30 0x0216b53f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#31 0x0102ddd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#32 0x0804b4e6 in main (argc=1, argv=0xbff456a4) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi