Application that crashed: kontact
Version of the application: 4.3.0 pre
KDE Version: 4.2.90 (KDE 4.2.90 (KDE 4.3 Beta2))
Qt Version: 4.5.1
Operating System: Linux 2.6.30-9-generic i686
Distribution: Ubuntu karmic (development branch)

What I was doing when the application crashed:
Kontact crashed on exit from kmail systray context menu.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  0x00c101ac in Kontact::Plugin::identifier (this=0x8ff45c0) at /usr/include/qt4/QtCore/qstring.h:711
#7  0x00db74ee in Kontact::MainWindow::activatePluginModule (this=0x8c7b7d8) at ../../../kontact/src/mainwindow.cpp:300
#8  0x00db75a4 in Kontact::MainWindow::setActivePluginModule (this=0x8c7b7d8, module=@0xbf85a428) at ../../../kontact/src/mainwindow.cpp:278
#9  0x0804bcef in KontactApp::newInstance (this=0xbf85b054) at ../../../kontact/src/main.cpp:147
#10 0x00851740 in KUniqueApplicationAdaptor::newInstance (this=0x8c6c8b8, asn_id=@0x9ef2ad0, args=@0xa570650) at ../../kdeui/kernel/kuniqueapplication.cpp:454
#11 0x00851e52 in KUniqueApplicationAdaptor::qt_metacall (this=0x8c6c8b8, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbf85a67c) at ./kuniqueapplication_p.moc:75
#12 0x00478c64 in QDBusConnectionPrivate::deliverCall (this=0x8c57e60, object=0x8c6c8b8, msg=@0x8e15c68, metaTypes=@0x8d37dbc, slotIdx=4) at qdbusintegrator.cpp:891
#13 0x00479e85 in QDBusConnectionPrivate::activateCall (this=0x8c57e60, object=0x8c6c8b8, flags=337, msg=@0x8e15c68) at qdbusintegrator.cpp:803
#14 0x0047a704 in QDBusConnectionPrivate::activateObject (this=0x8c57e60, node=@0x8e15c54, msg=@0x8e15c68, pathStartPos=16) at qdbusintegrator.cpp:1352
#15 0x0047a9ca in QDBusActivateObjectEvent::placeMetaCall (this=0x8e15c28) at qdbusintegrator.cpp:1469
#16 0x018f7eee in QObject::event (this=0xbf85b054, e=0x8e15c28) at kernel/qobject.cpp:1118
#17 0x018e743b in QCoreApplication::event (this=0xbf85b054, e=0x8e15c28) at kernel/qcoreapplication.cpp:1434
#18 0x00ef7746 in QApplication::event (this=0xbf85b054, e=0x8e15c28) at kernel/qapplication.cpp:2318
#19 0x00ef1c1c in QApplicationPrivate::notify_helper (this=0x8c745a8, receiver=0xbf85b054, e=0x8e15c28) at kernel/qapplication.cpp:4057
#20 0x00ef93f4 in QApplication::notify (this=0xbf85b054, receiver=0xbf85b054, e=0x8e15c28) at kernel/qapplication.cpp:4022
#21 0x0084a04a in KApplication::notify (this=0xbf85b054, receiver=0xbf85b054, event=0x8e15c28) at ../../kdeui/kernel/kapplication.cpp:302
#22 0x018e7b1b in QCoreApplication::notifyInternal (this=0xbf85b054, receiver=0xbf85b054, event=0x8e15c28) at kernel/qcoreapplication.cpp:610
#23 0x018e85e8 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x8c3f278) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#24 0x018e87bd in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1140
#25 0x0191336f in postEventSourceDispatch (s=0x8c768c0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#26 0x01ea2ad8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#27 0x01ea6070 in ?? () from /usr/lib/libglib-2.0.so.0
#28 0x01ea61a3 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#29 0x01912f9c in QEventDispatcherGlib::processEvents (this=0x8c5e898, flags={i = 36}) at kernel/qeventdispatcher_glib.cpp:324
#30 0x00f93975 in QGuiEventDispatcherGlib::processEvents (this=0x8c5e898, flags={i = 36}) at kernel/qguieventdispatcher_glib.cpp:202
#31 0x018e60a9 in QEventLoop::processEvents (this=0xbf85afb4, flags=) at kernel/qeventloop.cpp:149
#32 0x018e64f2 in QEventLoop::exec (this=0xbf85afb4, flags={i = 0}) at kernel/qeventloop.cpp:200
#33 0x018e887f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#34 0x00ef1a97 in QApplication::exec () at kernel/qapplication.cpp:3526
#35 0x0804b4d6 in main (argc=1, argv=0xbf85b254) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi