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 2.6.28-15-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
Kontact was in the systray and updated automatically mails for a disconnected imap account. A message box appeared, saying that the connection was lost with the server. I clicked on Ok and Kontact crashed.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#5  KIO::Slave::deref (this=0x1ff06c0) at /build/buildd/kde4libs-4.3.1/kio/kio/slave.cpp:242
#6  0x00007feb494d1f6f in KIO::Slave::gotInput (this=0x1ff06c0) at /build/buildd/kde4libs-4.3.1/kio/kio/slave.cpp:335
#7  0x00007feb494d41c8 in KIO::Slave::qt_metacall (this=0x1ff06c0, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x7fff54a7e210) at /build/buildd/kde4libs-4.3.1/obj-x86_64-linux-gnu/kio/slave.moc:76
#8  0x00007feb46fcfea2 in QMetaObject::activate (sender=0x1f32160, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x36d6ac0) at kernel/qobject.cpp:3113
#9  0x00007feb493eedb1 in KIO::ConnectionPrivate::dequeue (this=0x22b5ab0) at /build/buildd/kde4libs-4.3.1/kio/kio/connection.cpp:82
#10 0x00007feb493ef20a in KIO::Connection::qt_metacall (this=0x1f32160, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x3bdd560)
    at /build/buildd/kde4libs-4.3.1/obj-x86_64-linux-gnu/kio/connection.moc:73
#11 0x00007feb46fca5d8 in QObject::event (this=0x1f32160, e=0x21784b0) at kernel/qobject.cpp:1111
#12 0x00007feb47b3af4d in QApplicationPrivate::notify_helper (this=0x1aea5d0, receiver=0x1f32160, e=0x21784b0) at kernel/qapplication.cpp:4056
#13 0x00007feb47b4318a in QApplication::notify (this=0x7fff54a7ec70, receiver=0x1f32160, e=0x21784b0) at kernel/qapplication.cpp:4021
#14 0x00007feb48f3fdeb in KApplication::notify (this=0x7fff54a7ec70, receiver=0x1f32160, event=0x21784b0) at /build/buildd/kde4libs-4.3.1/kdeui/kernel/kapplication.cpp:302
#15 0x00007feb46fba6ac in QCoreApplication::notifyInternal (this=0x7fff54a7ec70, receiver=0x1f32160, event=0x21784b0) at kernel/qcoreapplication.cpp:610
#16 0x00007feb46fbb31a in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x1abe850) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#17 0x00007feb46fe3e03 in postEventSourceDispatch (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#18 0x00007feb4070b20a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#19 0x00007feb4070e8e0 in ?? () from /usr/lib/libglib-2.0.so.0
#20 0x00007feb4070ea7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#21 0x00007feb46fe3a8f in QEventDispatcherGlib::processEvents (this=0x1abe0a0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#22 0x00007feb47bd3bdf in QGuiEventDispatcherGlib::processEvents (this=0x20, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#23 0x00007feb46fb8f42 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 1420290960}) at kernel/qeventloop.cpp:149
#24 0x00007feb46fb9314 in QEventLoop::exec (this=0x7fff54a7ebd0, flags={i = 1420291040}) at kernel/qeventloop.cpp:201
#25 0x00007feb46fbb5e4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#26 0x0000000000404945 in main (argc=1, argv=0x7fff54a7f358) at /build/buildd/kdepim-4.3.1/kontact/src/main.cpp:218

Reported using DrKonqi