Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.30-1-686 i686

What I was doing when the application crashed:
I don't have much to add to the original report.  I clicked (right-clicked, I think) on the notifications icon; at the time there were no active notifications.  And ho, crash.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb5f9b700 (LWP 3138))]

Thread 2 (Thread 0xa95e0b90 (LWP 3140)):
#0  0xb7faa424 in __kernel_vsyscall ()
#1  0xb66d0f65 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i686/cmov/libpthread.so.0
#2  0xb68aa85d in pthread_cond_wait () from /lib/i686/cmov/libc.so.6
#3  0xb7db4562 in QWaitConditionPrivate::wait (this=0x8e78b20, mutex=0x8e78b1c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0x8e78b20, mutex=0x8e78b1c, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0xb65d667a in QHostInfoAgent::run (this=0x8e78b10) at kernel/qhostinfo.cpp:260
#6  0xb7db3582 in QThreadPrivate::start (arg=0x8e78b10) at thread/qthread_unix.cpp:188
#7  0xb66cd4b5 in start_thread () from /lib/i686/cmov/libpthread.so.0
#8  0xb689ba5e in clone () from /lib/i686/cmov/libc.so.6

Thread 1 (Thread 0xb5f9b700 (LWP 3138)):
[KCrash Handler]
#6  0xb5d2dd1d in Plasma::ExtenderItem::config (this=0x9644e48) at ../../plasma/extenderitem.cpp:153
#7  0xb5d2f8a3 in Plasma::ExtenderItem::isGroup (this=0x9644e48) at ../../plasma/extenderitem.cpp:337
#8  0xb5d25b9a in Plasma::Extender::isEmpty (this=0x8de2368) at ../../plasma/extender.cpp:717
#9  0xb5d3e730 in Plasma::PopupAppletPrivate::internalTogglePopup (this=0x8de4720) at ../../plasma/popupapplet.cpp:543
#10 0xb5d3ecb3 in Plasma::PopupApplet::qt_metacall (this=0x8ddb240, _c=QMetaObject::InvokeMetaMethod, _id=3, _a=0xbfa30a58) at ./popupapplet.moc:85
#11 0xa96a27da in SystemTray::Applet::qt_metacall (this=0x8ddb240, _c=QMetaObject::InvokeMetaMethod, _id=39, _a=0xbfa30a58) at ./applet.moc:77
#12 0xb7eb9b33 in QMetaObject::activate (sender=0x8f1b408, from_signal_index=5, to_signal_index=5, argv=0x0) at kernel/qobject.cpp:3112
#13 0xb7eba782 in QMetaObject::activate (sender=0x8f1b408, m=0xb5e53e0c, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3186
#14 0xb5da9707 in Plasma::BusyWidget::clicked (this=0x8f1b408) at ./busywidget.moc:118
#15 0xb5da973d in Plasma::BusyWidget::mousePressEvent (this=0x8f1b408, event=0xbfa31164) at ../../plasma/widgets/busywidget.cpp:207
#16 0xb714ba72 in QGraphicsItem::sceneEvent (this=0x8f1b410, event=0xbfa31164) at graphicsview/qgraphicsitem.cpp:5022
#17 0xb719ba3f in QGraphicsWidget::sceneEvent (this=0x8f1b408, event=0xbfa31164) at graphicsview/qgraphicswidget.cpp:1110
#18 0xb7170ed4 in QGraphicsScenePrivate::sendEvent (this=0x8bc5088, item=0x8f1b410, event=0xbfa31164) at graphicsview/qgraphicsscene.cpp:1159
#19 0xb71724be in QGraphicsScenePrivate::sendMouseEvent (this=0x8bc5088, mouseEvent=0xbfa31164) at graphicsview/qgraphicsscene.cpp:1230
#20 0xb717d853 in QGraphicsScenePrivate::mousePressEventHandler (this=0x8bc5088, mouseEvent=0xbfa31164) at graphicsview/qgraphicsscene.cpp:1319
#21 0xb717e48a in QGraphicsScene::event (this=0x8b72320, event=0xbfa31164) at graphicsview/qgraphicsscene.cpp:3805
#22 0xb6b4c814 in QApplicationPrivate::notify_helper (this=0x8b30c40, receiver=0x8b72320, e=0xbfa31164) at kernel/qapplication.cpp:4056
#23 0xb6b5497e in QApplication::notify (this=0x8b09ca0, receiver=0x8b72320, e=0xbfa31164) at kernel/qapplication.cpp:3603
#24 0xb75954ad in KApplication::notify (this=0x8b09ca0, receiver=0x8b72320, event=0xbfa31164) at ../../kdeui/kernel/kapplication.cpp:302
#25 0xb7ea49cb in QCoreApplication::notifyInternal (this=0x8b09ca0, receiver=0x8b72320, event=0xbfa31164) at kernel/qcoreapplication.cpp:610
#26 0xb718c203 in QCoreApplication::sendEvent (this=0x8f144b8, event=0xbfa3182c) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#27 QGraphicsView::mousePressEvent (this=0x8f144b8, event=0xbfa3182c) at graphicsview/qgraphicsview.cpp:3212
#28 0xb6ba287e in QWidget::event (this=0x8f144b8, event=0xbfa3182c) at kernel/qwidget.cpp:7545
#29 0xb6f48f53 in QFrame::event (this=0x8f144b8, e=0xbfa3182c) at widgets/qframe.cpp:559
#30 0xb6fe7f6f in QAbstractScrollArea::viewportEvent (this=0x8f144b8, e=0x9644e48) at widgets/qabstractscrollarea.cpp:962
#31 0xb7190c52 in QGraphicsView::viewportEvent (this=0x8f144b8, event=0xbfa3182c) at graphicsview/qgraphicsview.cpp:2919
#32 0xb6fea545 in QAbstractScrollAreaPrivate::viewportEvent (this=0x8dabff8, o=0x8f8fca0, e=0xbfa3182c) at widgets/qabstractscrollarea_p.h:100
#33 QAbstractScrollAreaFilter::eventFilter (this=0x8dabff8, o=0x8f8fca0, e=0xbfa3182c) at widgets/qabstractscrollarea_p.h:111
#34 0xb7ea3bfa in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x8b30c40, receiver=0x8f8fca0, event=0xbfa3182c) at kernel/qcoreapplication.cpp:726
#35 0xb6b4c7ec in QApplicationPrivate::notify_helper (this=0x8b30c40, receiver=0x8f8fca0, e=0xbfa3182c) at kernel/qapplication.cpp:4052
#36 0xb6b552e1 in QApplication::notify (this=0x8b09ca0, receiver=0x8f8fca0, e=0xbfa3182c) at kernel/qapplication.cpp:3758
#37 0xb75954ad in KApplication::notify (this=0x8b09ca0, receiver=0x8f8fca0, event=0xbfa3182c) at ../../kdeui/kernel/kapplication.cpp:302
#38 0xb7ea49cb in QCoreApplication::notifyInternal (this=0x8b09ca0, receiver=0x8f8fca0, event=0xbfa3182c) at kernel/qcoreapplication.cpp:610
#39 0xb6b5436e in QCoreApplication::sendSpontaneousEvent (receiver=0x8f8fca0, event=0xbfa3182c, alienWidget=0x8f8fca0, nativeWidget=0x8f144b8, buttonDown=0xb73c2aa0, lastMouseReceiver=...)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#40 QApplicationPrivate::sendMouseEvent (receiver=0x8f8fca0, event=0xbfa3182c, alienWidget=0x8f8fca0, nativeWidget=0x8f144b8, buttonDown=0xb73c2aa0, lastMouseReceiver=...)
    at kernel/qapplication.cpp:2924
#41 0xb6bc2ea5 in QETWidget::translateMouseEvent (this=0x8f144b8, event=0xbfa32ddc) at kernel/qapplication_x11.cpp:4409
#42 0xb6bc2386 in QApplication::x11ProcessEvent (this=0x8b09ca0, event=0xbfa32ddc) at kernel/qapplication_x11.cpp:3428
#43 0xb6bec892 in x11EventSourceDispatch (s=0x8b33800, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#44 0xb671ae98 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#45 0xb671e623 in ?? () from /lib/libglib-2.0.so.0
#46 0xb671e7a8 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#47 0xb7ecf858 in QEventDispatcherGlib::processEvents (this=0x8b30a30, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#48 0xb6bebfd5 in QGuiEventDispatcherGlib::processEvents (this=0x8b30a30, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#49 0xb7ea301a in QEventLoop::processEvents (this=0xbfa33040, flags=...) at kernel/qeventloop.cpp:149
#50 0xb7ea3462 in QEventLoop::exec (this=0xbfa33040, flags=...) at kernel/qeventloop.cpp:201
#51 0xb7ea58b9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#52 0xb6b4c697 in QApplication::exec () at kernel/qapplication.cpp:3525
#53 0xb4b73f40 in kdemain (argc=1, argv=0x8aba320) at ../../../../plasma/shells/desktop/main.cpp:50
#54 0x0804e291 in launch (argc=1, _name=0x8ad326c "/usr/bin/plasma-desktop", args=0x8ad3284 "", cwd=0x0, envc=0, envs=0x8ad3288 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x805109f "0") at ../../kinit/kinit.cpp:677
#55 0x0804ea15 in handle_launcher_request (sock=7, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#56 0x0804ef3f in handle_requests (waitForPid=0) at ../../kinit/kinit.cpp:1362
#57 0x0804f6c9 in main (argc=2, argv=0xbfa338c4, envp=0xbfa338d0) at ../../kinit/kinit.cpp:1793

This bug may be a duplicate of or related to bug 197016

Reported using DrKonqi