Application that crashed: kontact
Version of the application: 4.3.4
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.3
Operating System: Linux 2.6.32-trunk-686 i686
Distribution: Debian GNU/Linux unstable (sid)

What I was doing when the application crashed:
minimizing kmail and trying to restart it by command ends in a crash

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  0xb77ec20c in QString (this=0x9cf8368) at /usr/include/qt4/QtCore/qstring.h:711
#7  Kontact::Plugin::identifier (this=0x9cf8368) at ../../kontactinterfaces/plugin.cpp:97
#8  0xb780451e in Kontact::MainWindow::activatePluginModule (this=0x9a66130) at ../../../kontact/src/mainwindow.cpp:303
#9  0xb78045d4 in Kontact::MainWindow::setActivePluginModule (this=0x9a66130, module=...) at ../../../kontact/src/mainwindow.cpp:281
#10 0x0804bcef in KontactApp::newInstance (this=0xbffdf044) at ../../../kontact/src/main.cpp:147
#11 0xb7513130 in KUniqueApplicationAdaptor::newInstance (this=0x9abd9b0, asn_id=..., args=...) at ../../kdeui/kernel/kuniqueapplication.cpp:459
#12 0xb7513842 in KUniqueApplicationAdaptor::qt_metacall (this=0x9abd9b0, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbffde638) at ./kuniqueapplication_p.moc:75
#13 0xb58f2be5 in QDBusConnectionPrivate::deliverCall (this=0x9a59ea8, object=0x9abd9b0, msg=..., metaTypes=..., slotIdx=4) at qdbusintegrator.cpp:891
#14 0xb58f3e31 in QDBusConnectionPrivate::activateCall (this=0x9a59ea8, object=0x9abd9b0, flags=337, msg=...) at qdbusintegrator.cpp:803
#15 0xb58f4254 in QDBusConnectionPrivate::activateObject (this=0x9a59ea8, node=..., msg=..., pathStartPos=16) at qdbusintegrator.cpp:1370
#16 0xb58f473a in QDBusActivateObjectEvent::placeMetaCall (this=0xa35e790) at qdbusintegrator.cpp:1464
#17 0xb700b5e0 in QObject::event (this=0xbffdf044, e=0xa35e790) at kernel/qobject.cpp:1110
#18 0xb6ffab8b in QCoreApplication::event (this=0xbffdf044, e=0xa35e790) at kernel/qcoreapplication.cpp:1434
#19 0xb66402c9 in QApplication::event (this=0xbffdf044, e=0xa35e790) at kernel/qapplication.cpp:2317
#20 0xb663aa94 in QApplicationPrivate::notify_helper (this=0x9a616b8, receiver=0xbffdf044, e=0xa35e790) at kernel/qapplication.cpp:4065
#21 0xb6642bee in QApplication::notify (this=0xbffdf044, receiver=0xbffdf044, e=0xa35e790) at kernel/qapplication.cpp:3605
#22 0xb750be2a in KApplication::notify (this=0xbffdf044, receiver=0xbffdf044, event=0xa35e790) at ../../kdeui/kernel/kapplication.cpp:302
#23 0xb6ffb1eb in QCoreApplication::notifyInternal (this=0xbffdf044, receiver=0xbffdf044, event=0xa35e790) at kernel/qcoreapplication.cpp:610
#24 0xb6ffbe2e in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x9a42388) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#25 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x9a42388) at kernel/qcoreapplication.cpp:1247
#26 0xb6ffc00d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1140
#27 0xb70264cf in QCoreApplication::sendPostedEvents (s=0x9a62f90) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#28 postEventSourceDispatch (s=0x9a62f90) at kernel/qeventdispatcher_glib.cpp:276
#29 0xb4a112e5 in g_main_dispatch (context=0x9a62f10) at /build/buildd-glib2.0_2.24.0-1-i386-o5zIuQ/glib2.0-2.24.0/glib/gmain.c:1960
#30 IA__g_main_context_dispatch (context=0x9a62f10) at /build/buildd-glib2.0_2.24.0-1-i386-o5zIuQ/glib2.0-2.24.0/glib/gmain.c:2513
#31 0xb4a15000 in g_main_context_iterate (context=0x9a62f10, block=<value optimized out>, dispatch=1, self=0x9a5f158) at /build/buildd-glib2.0_2.24.0-1-i386-o5zIuQ/glib2.0-2.24.0/glib/gmain.c:2591
#32 0xb4a15198 in IA__g_main_context_iteration (context=0x9a62f10, may_block=1) at /build/buildd-glib2.0_2.24.0-1-i386-o5zIuQ/glib2.0-2.24.0/glib/gmain.c:2654
#33 0xb7026041 in QEventDispatcherGlib::processEvents (this=0x9a420d8, flags=...) at kernel/qeventdispatcher_glib.cpp:407
#34 0xb66da305 in QGuiEventDispatcherGlib::processEvents (this=0x9a420d8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#35 0xb6ff983a in QEventLoop::processEvents (this=0xbffdefc0, flags=...) at kernel/qeventloop.cpp:149
#36 0xb6ff9c82 in QEventLoop::exec (this=0xbffdefc0, flags=...) at kernel/qeventloop.cpp:201
#37 0xb6ffc0d9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#38 0xb663a917 in QApplication::exec () at kernel/qapplication.cpp:3525
#39 0x0804b4c6 in main (argc=1, argv=0xbffdf244) at ../../../kontact/src/main.cpp:218

This bug may be a duplicate of or related to bug 218930

Reported using DrKonqi