Application that crashed: kontact
Version of the application: 4.3.1
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.3
Operating System: Linux 2.6.30-gentoo-r5v20091104-r01 x86_64

What I was doing when the application crashed:
Kontact crashed directly after I tried to detach the single open tab in the Akregator Plugin. This crash occurs sporadically, so far I haven't found a way to reliably reproduce it.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#5  QObjectPrivate::removeReceiver (this=0x298e3a0, signal=<value optimized out>, receiver=0x29b27d0) at kernel/qobject.cpp:293
#6  0x00007f4d8183b3f8 in ~QObject (this=0x29b27d0) at kernel/qobject.cpp:814
#7  0x00007f4d825e1ba7 in ~QActionGroup (this=0x298e3a0) at kernel/qactiongroup.cpp:159
#8  0x00007f4d8329799a in ~KSelectActionPrivate (this=0x3ac6700) at /var/tmp/portage/kde-base/kdelibs-4.3.1-r2/work/kdelibs-4.3.1/kdeui/actions/kselectaction_p.h:65
#9  0x00007f4d83298961 in ~KSelectAction (this=0x2932ea0) at /var/tmp/portage/kde-base/kdelibs-4.3.1-r2/work/kdelibs-4.3.1/kdeui/actions/kselectaction.cpp:100
#10 0x00007f4d81834a70 in QObjectPrivate::deleteChildren (this=0x28130d0) at kernel/qobject.cpp:1838
#11 0x00007f4d8183b307 in ~QObject (this=0x3ad1220) at kernel/qobject.cpp:836
#12 0x00007f4d825df693 in ~QAction (this=0x3ad1220) at kernel/qaction.cpp:629
#13 0x00007f4d8263463a in ~QWidgetAction (this=0x3ad1220) at kernel/qwidgetaction.cpp:130
#14 0x00007f4d8328dfb3 in ~KCodecAction (this=0x3ad1220) at /var/tmp/portage/kde-base/kdelibs-4.3.1-r2/work/kdelibs-4.3.1/kdeui/actions/kcodecaction.cpp:86
#15 0x00007f4d81834a70 in QObjectPrivate::deleteChildren (this=0x3e045b0) at kernel/qobject.cpp:1838
#16 0x00007f4d8183b307 in ~QObject (this=0x29b19b0) at kernel/qobject.cpp:836
#17 0x00007f4d8438d2c3 in ~Part (this=0x29b19b0, __vtt_parm=0x7f4d876d5ff0) at /var/tmp/portage/kde-base/kdelibs-4.3.1-r2/work/kdelibs-4.3.1/kparts/part.cpp:212
#18 0x00007f4d8701289d in ~KHTMLPart (this=0x29b19b0) at /var/tmp/portage/kde-base/kdelibs-4.3.1-r2/work/kdelibs-4.3.1/khtml/khtml_part.cpp:625
#19 0x00007f4d693e5f5c in ~Private (this=0x27e9f10) at /var/tmp/portage/kde-base/akregator-4.3.1/work/akregator-4.3.1/akregator/src/browserframe_p.cpp:50
#20 0x00007f4d693e2ad0 in ~BrowserFrame (this=0x28475a0) at /var/tmp/portage/kde-base/akregator-4.3.1/work/akregator-4.3.1/akregator/src/browserframe.cpp:63
#21 0x00007f4d693e19e6 in Akregator::FrameManager::slotRemoveFrame (this=0x2d36710, id=1) at /var/tmp/portage/kde-base/akregator-4.3.1/work/akregator-4.3.1/akregator/src/framemanager.cpp:108
#22 0x00007f4d693e22d7 in Akregator::FrameManager::qt_metacall (this=0x2d36710, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7ffff7811890)
    at /var/tmp/portage/kde-base/akregator-4.3.1/work/akregator-4.3.1_build/akregator/src/framemanager.moc:149
#23 0x00007f4d818397f6 in QMetaObject::activate (sender=0x2ab9d80, from_signal_index=<value optimized out>, to_signal_index=69, argv=0x3c660a0) at kernel/qobject.cpp:3101
#24 0x00007f4d694012e1 in Akregator::TabWidget::signalRemoveFrameRequest (this=0x298e3a0, _t1=1)
    at /var/tmp/portage/kde-base/akregator-4.3.1/work/akregator-4.3.1_build/akregator/src/tabwidget.moc:147
#25 0x00007f4d69401a65 in Akregator::TabWidget::slotCloseTab (this=0x2ab9d80) at /var/tmp/portage/kde-base/akregator-4.3.1/work/akregator-4.3.1/akregator/src/tabwidget.cpp:389
#26 0x00007f4d69403c71 in Akregator::TabWidget::slotDetachTab (this=0x2ab9d80) at /var/tmp/portage/kde-base/akregator-4.3.1/work/akregator-4.3.1/akregator/src/tabwidget.cpp:364
#27 0x00007f4d69403ddd in Akregator::TabWidget::qt_metacall (this=0x2ab9d80, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7ffff7811ae0)
    at /var/tmp/portage/kde-base/akregator-4.3.1/work/akregator-4.3.1_build/akregator/src/tabwidget.moc:123
#28 0x00007f4d818397f6 in QMetaObject::activate (sender=0x27ff020, from_signal_index=<value optimized out>, to_signal_index=6, argv=0x3c660a0) at kernel/qobject.cpp:3101
#29 0x00007f4d825dd647 in QAction::triggered (this=0x298e3a0, _t1=false) at .moc/release-shared/moc_qaction.cpp:236
#30 0x00007f4d825de8e0 in QAction::activate (this=0x27ff020, event=<value optimized out>) at kernel/qaction.cpp:1167
#31 0x00007f4d8296282c in QMenuPrivate::activateCausedStack (this=0x45ea450, causedStack=@0x7ffff7811c00, action=0x27ff020, action_e=QAction::Trigger, self=true) at widgets/qmenu.cpp:967
#32 0x00007f4d829684db in QMenuPrivate::activateAction (this=0x45ea450, action=0x27ff020, action_e=45461376, self=true) at widgets/qmenu.cpp:1060
#33 0x00007f4d8342efe1 in KMenu::mouseReleaseEvent (this=0x2b5af80, e=0x7ffff7812720) at /var/tmp/portage/kde-base/kdelibs-4.3.1-r2/work/kdelibs-4.3.1/kdeui/widgets/kmenu.cpp:456
#34 0x00007f4d8262f548 in QWidget::event (this=0x2b5af80, event=0x7ffff7812720) at kernel/qwidget.cpp:7554
#35 0x00007f4d82969aab in QMenu::event (this=0x2b5af80, e=0x7ffff7812720) at widgets/qmenu.cpp:2358
#36 0x00007f4d825e299d in QApplicationPrivate::notify_helper (this=0x1c14ce0, receiver=0x2b5af80, e=0x7ffff7812720) at kernel/qapplication.cpp:4065
#37 0x00007f4d825ea9ab in QApplication::notify (this=<value optimized out>, receiver=0x2b5af80, e=0x7ffff7812720) at kernel/qapplication.cpp:3767
#38 0x00007f4d8335defb in KApplication::notify (this=0x7ffff7816ed0, receiver=0x2b5af80, event=0x7ffff7812720)
    at /var/tmp/portage/kde-base/kdelibs-4.3.1-r2/work/kdelibs-4.3.1/kdeui/kernel/kapplication.cpp:302
#39 0x00007f4d81827a1b in QCoreApplication::notifyInternal (this=0x7ffff7816ed0, receiver=0x2b5af80, event=0x7ffff7812720) at kernel/qcoreapplication.cpp:606
#40 0x00007f4d825ebe98 in QApplicationPrivate::sendMouseEvent (receiver=0x2b5af80, event=0x7ffff7812720, alienWidget=0x0, nativeWidget=0x2b5af80, buttonDown=<value optimized out>, 
    lastMouseReceiver=@0x7f4d82ef1ef0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#41 0x00007f4d82644e6b in QETWidget::translateMouseEvent (this=0x2b5af80, event=<value optimized out>) at kernel/qapplication_x11.cpp:4345
#42 0x00007f4d82643856 in QApplication::x11ProcessEvent (this=0x7ffff7816ed0, event=0x7ffff7814110) at kernel/qapplication_x11.cpp:3552
#43 0x00007f4d8266807c in x11EventSourceDispatch (s=0x1c0f080, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#44 0x00007f4d7ce2d4a9 in IA__g_main_context_dispatch (context=0x1c0e120) at gmain.c:1824
#45 0x00007f4d7ce30ae8 in g_main_context_iterate (context=0x1c0e120, block=1, dispatch=1, self=<value optimized out>) at gmain.c:2455
#46 0x00007f4d7ce30c9c in IA__g_main_context_iteration (context=0x1c0e120, may_block=1) at gmain.c:2518
#47 0x00007f4d8184c43f in QEventDispatcherGlib::processEvents (this=0x1c03a70, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#48 0x00007f4d8266793f in QGuiEventDispatcherGlib::processEvents (this=0x298e3a0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#49 0x00007f4d81826402 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -142523392}) at kernel/qeventloop.cpp:149
#50 0x00007f4d8182659c in QEventLoop::exec (this=0x7ffff7814440, flags={i = -142523296}) at kernel/qeventloop.cpp:197
#51 0x00007f4d82969947 in QMenu::exec (this=<value optimized out>, p=@0x7ffff7814690, action=0x0) at widgets/qmenu.cpp:1998
#52 0x00007f4d6940140d in Akregator::TabWidget::contextMenu (this=0x2ab9d80, i=<value optimized out>, p=@0x7ffff7814690)
    at /var/tmp/portage/kde-base/akregator-4.3.1/work/akregator-4.3.1/akregator/src/tabwidget.cpp:351
#53 0x00007f4d8344e219 in KTabWidget::qt_metacall (this=0x2ab9d80, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7ffff7814620)
    at /var/tmp/portage/kde-base/kdelibs-4.3.1-r2/work/kdelibs-4.3.1_build/kdeui/ktabwidget.moc:152
#54 0x00007f4d69403d35 in Akregator::TabWidget::qt_metacall (this=0x298e3a0, _c=QMetaObject::QueryPropertyUser, _id=63331888, _a=0x3c660a0)
    at /var/tmp/portage/kde-base/akregator-4.3.1/work/akregator-4.3.1_build/akregator/src/tabwidget.moc:101
#55 0x00007f4d818397f6 in QMetaObject::activate (sender=0x2bcd490, from_signal_index=<value optimized out>, to_signal_index=37, argv=0x3c660a0) at kernel/qobject.cpp:3101
#56 0x00007f4d8344b703 in KTabBar::contextMenu (this=0x298e3a0, _t1=1, _t2=<value optimized out>) at /var/tmp/portage/kde-base/kdelibs-4.3.1-r2/work/kdelibs-4.3.1_build/kdeui/ktabbar.moc:117
#57 0x00007f4d8344c4f0 in KTabBar::mousePressEvent (this=0x2bcd490, event=<value optimized out>) at /var/tmp/portage/kde-base/kdelibs-4.3.1-r2/work/kdelibs-4.3.1/kdeui/widgets/ktabbar.cpp:111
#58 0x00007f4d8262f6e3 in QWidget::event (this=0x2bcd490, event=0x7ffff7815010) at kernel/qwidget.cpp:7550
#59 0x00007f4d8298d3da in QTabBar::event (this=0x2bcd490, event=0x7ffff7815010) at widgets/qtabbar.cpp:1453
#60 0x00007f4d825e299d in QApplicationPrivate::notify_helper (this=0x1c14ce0, receiver=0x2bcd490, e=0x7ffff7815010) at kernel/qapplication.cpp:4065
#61 0x00007f4d825ea9ab in QApplication::notify (this=<value optimized out>, receiver=0x2bcd490, e=0x7ffff7815010) at kernel/qapplication.cpp:3767
#62 0x00007f4d8335defb in KApplication::notify (this=0x7ffff7816ed0, receiver=0x2bcd490, event=0x7ffff7815010)
    at /var/tmp/portage/kde-base/kdelibs-4.3.1-r2/work/kdelibs-4.3.1/kdeui/kernel/kapplication.cpp:302
#63 0x00007f4d81827a1b in QCoreApplication::notifyInternal (this=0x7ffff7816ed0, receiver=0x2bcd490, event=0x7ffff7815010) at kernel/qcoreapplication.cpp:606
#64 0x00007f4d825ebe98 in QApplicationPrivate::sendMouseEvent (receiver=0x2bcd490, event=0x7ffff7815010, alienWidget=0x0, nativeWidget=0x2bcd490, buttonDown=<value optimized out>, 
    lastMouseReceiver=@0x7f4d82ef1ef0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#65 0x00007f4d82644cbc in QETWidget::translateMouseEvent (this=0x2bcd490, event=<value optimized out>) at kernel/qapplication_x11.cpp:4411
#66 0x00007f4d82643856 in QApplication::x11ProcessEvent (this=0x7ffff7816ed0, event=0x7ffff7816a00) at kernel/qapplication_x11.cpp:3552
#67 0x00007f4d8266807c in x11EventSourceDispatch (s=0x1c0f080, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#68 0x00007f4d7ce2d4a9 in IA__g_main_context_dispatch (context=0x1c0e120) at gmain.c:1824
#69 0x00007f4d7ce30ae8 in g_main_context_iterate (context=0x1c0e120, block=1, dispatch=1, self=<value optimized out>) at gmain.c:2455
#70 0x00007f4d7ce30c9c in IA__g_main_context_iteration (context=0x1c0e120, may_block=1) at gmain.c:2518
#71 0x00007f4d8184c43f in QEventDispatcherGlib::processEvents (this=0x1c03a70, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#72 0x00007f4d8266793f in QGuiEventDispatcherGlib::processEvents (this=0x298e3a0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#73 0x00007f4d81826402 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -142512912}) at kernel/qeventloop.cpp:149
#74 0x00007f4d8182659c in QEventLoop::exec (this=0x7ffff7816d30, flags={i = -142512832}) at kernel/qeventloop.cpp:197
#75 0x00007f4d818285ec in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#76 0x0000000000404b49 in main (argc=1, argv=0x7ffff78174a8) at /var/tmp/portage/kde-base/kontact-4.3.1/work/kontact-4.3.1/kontact/src/main.cpp:218

Reported using DrKonqi