Application: plasma-desktop (0.3)
KDE Platform Version: 4.3.90 (KDE 4.3.90 (KDE 4.4 RC1))
Qt Version: 4.6.0
Operating System: Linux 2.6.32-10-generic-pae i686
Distribution: Ubuntu lucid (development branch)

-- Information about the crash:
Leading up to this crash, I removed a newly-added battery applet and shortly after closed the widget explorer. Right as I clicked the close button on the widget explorer plasma-desktop crashed. Might be a Qt bug.

The crash does not seem to be reproducible.

 -- Backtrace:
Application: Plasma Workspace (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0xb36d1760 (LWP 5999))]

Thread 2 (Thread 0xa6adbb70 (LWP 6000)):
#0  0xb78da430 in __kernel_vsyscall ()
#1  0xb5a59f55 in pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:122
#2  0xb77f26dd in __pthread_cond_wait (cond=0xa105cc0, mutex=0xa105ca8) at forward.c:139
#3  0xb5ad02e7 in QWaitConditionPrivate::wait (this=0xa108c48, mutex=0xa108c44, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0xa108c48, mutex=0xa108c44, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0xb44d4e82 in QHostInfoAgent::run (this=0xa108c38) at kernel/qhostinfo.cpp:252
#6  0xb5acf38e in QThreadPrivate::start (arg=0xa108c38) at thread/qthread_unix.cpp:244
#7  0xb5a558de in start_thread (arg=0xa6adbb70) at pthread_create.c:300
#8  0xb77e573e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb36d1760 (LWP 5999)):
[KCrash Handler]
#6  QGraphicsItemPrivate::combineOpacityFromParent (this=0x96e2728, item=0xa9b9958, exposeRect=..., intersector=0x96e5e40, items=0xbf91848c, viewTransform=..., mode=Qt::IntersectsItemShape, 
    parentOpacity=1) at graphicsview/qgraphicsitem_p.h:391
#7  QGraphicsSceneIndexPrivate::recursive_items_helper (this=0x96e2728, item=0xa9b9958, exposeRect=..., intersector=0x96e5e40, items=0xbf91848c, viewTransform=..., mode=Qt::IntersectsItemShape, 
    parentOpacity=1) at graphicsview/qgraphicssceneindex.cpp:281
#8  0xb654ea7e in QGraphicsSceneIndexPrivate::items_helper (this=0x96b3790, rect=..., mode=Qt::IntersectsItemShape, order=Qt::DescendingOrder, deviceTransform=...)
    at graphicsview/qgraphicssceneindex_p.h:159
#9  QGraphicsSceneIndex::items (this=0x96b3790, rect=..., mode=Qt::IntersectsItemShape, order=Qt::DescendingOrder, deviceTransform=...) at graphicsview/qgraphicssceneindex.cpp:457
#10 0xb652330b in QGraphicsScene::items (this=0x96e59a0, rect=..., mode=Qt::IntersectsItemShape, order=Qt::DescendingOrder, deviceTransform=...) at graphicsview/qgraphicsscene.cpp:2024
#11 0xb652aa45 in QGraphicsScenePrivate::itemsAtPosition (this=0x96e2930, screenPos=..., scenePos=..., widget=0x9fc5a20) at graphicsview/qgraphicsscene.cpp:1023
#12 0xb652af10 in QGraphicsScenePrivate::dispatchHoverEvent (this=0x96e2930, hoverEvent=0xbf9184dc) at graphicsview/qgraphicsscene.cpp:3768
#13 0xb652b1c8 in QGraphicsScene::mouseMoveEvent (this=0x96e59a0, mouseEvent=0xbf9189f4) at graphicsview/qgraphicsscene.cpp:3976
#14 0xb653a3ed in QGraphicsScene::event (this=0x96e59a0, event=0xbf9189f4) at graphicsview/qgraphicsscene.cpp:3341
#15 0xb5e951dc in QApplicationPrivate::notify_helper (this=0x9606378, receiver=0x96e59a0, e=0xbf9189f4) at kernel/qapplication.cpp:4242
#16 0xb5e9be37 in QApplication::notify (this=0x95f7f50, receiver=0x96e59a0, e=0xbf9189f4) at kernel/qapplication.cpp:3661
#17 0xb6c1038a in KApplication::notify (this=0x95f7f50, receiver=0x96e59a0, event=0xbf9189f4) at ../../kdeui/kernel/kapplication.cpp:302
#18 0xb5bd06fb in QCoreApplication::notifyInternal (this=0x95f7f50, receiver=0x96e59a0, event=0xbf9189f4) at kernel/qcoreapplication.cpp:704
#19 0xb5e960be in QCoreApplication::sendSpontaneousEvent (receiver=0x96e59a0, event=0xa964c18) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#20 qt_sendSpontaneousEvent (receiver=0x96e59a0, event=0xa964c18) at kernel/qapplication.cpp:5219
#21 0xb655a822 in QGraphicsViewPrivate::mouseMoveEventHandler (this=0x9fc45a0, event=0xbf9191c0) at graphicsview/qgraphicsview.cpp:617
#22 0xb655aa66 in QGraphicsView::mouseMoveEvent (this=0x9fc6ac0, event=0xbf9191c0) at graphicsview/qgraphicsview.cpp:3157
#23 0xb5ef1fa6 in QWidget::event (this=0x9fc6ac0, event=0xbf9191c0) at kernel/qwidget.cpp:7959
#24 0xb62eb1a3 in QFrame::event (this=0x9fc6ac0, e=0xbf9191c0) at widgets/qframe.cpp:557
#25 0xb6384bb2 in QAbstractScrollArea::viewportEvent (this=0x96e2728, e=0xa964c18) at widgets/qabstractscrollarea.cpp:1032
#26 0xb655836b in QGraphicsView::viewportEvent (this=0x9fc6ac0, event=0xbf9191c0) at graphicsview/qgraphicsview.cpp:2747
#27 0xb6387495 in QAbstractScrollAreaPrivate::viewportEvent (this=0x9fec020, o=0x9fc5a20, e=0xbf9191c0) at widgets/qabstractscrollarea_p.h:100
#28 QAbstractScrollAreaFilter::eventFilter (this=0x9fec020, o=0x9fc5a20, e=0xbf9191c0) at widgets/qabstractscrollarea_p.h:116
#29 0xb5bcf99a in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x9606378, receiver=0x9fc5a20, event=0xbf9191c0) at kernel/qcoreapplication.cpp:819
#30 0xb5e951b9 in QApplicationPrivate::notify_helper (this=0x9606378, receiver=0x9fc5a20, e=0xbf9191c0) at kernel/qapplication.cpp:4238
#31 0xb5e9c7ab in QApplication::notify (this=0x95f7f50, receiver=0x9fc5a20, e=0xbf9191c0) at kernel/qapplication.cpp:3822
#32 0xb6c1038a in KApplication::notify (this=0x95f7f50, receiver=0x9fc5a20, event=0xbf9191c0) at ../../kdeui/kernel/kapplication.cpp:302
#33 0xb5bd06fb in QCoreApplication::notifyInternal (this=0x95f7f50, receiver=0x9fc5a20, event=0xbf9191c0) at kernel/qcoreapplication.cpp:704
#34 0xb5e9b762 in QCoreApplication::sendEvent (receiver=0x9fc5a20, event=0xbf9191c0, alienWidget=0x9fc5a20, nativeWidget=0x9fc6ac0, buttonDown=0xb67d1060, lastMouseReceiver=..., spontaneous=true)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#35 QApplicationPrivate::sendMouseEvent (receiver=0x9fc5a20, event=0xbf9191c0, alienWidget=0x9fc5a20, nativeWidget=0x9fc6ac0, buttonDown=0xb67d1060, lastMouseReceiver=..., spontaneous=true)
    at kernel/qapplication.cpp:2956
#36 0xb5f24cc8 in QETWidget::translateMouseEvent (this=0x9fc6ac0, event=0xbf9196dc) at kernel/qapplication_x11.cpp:4368
#37 0xb5f241b1 in QApplication::x11ProcessEvent (this=0x95f7f50, event=0xbf9196dc) at kernel/qapplication_x11.cpp:3379
#38 0xb5f5307a in x11EventSourceDispatch (s=0x9609200, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#39 0xb4061fd8 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#40 0x09609200 in ?? ()
#41 0xb4065880 in ?? () from /lib/libglib-2.0.so.0
#42 0xb40659b3 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#43 0x00000001 in ?? ()
#44 0xb5bfc3f5 in QEventDispatcherGlib::processEvents (this=0x9605fd0, flags=...) at kernel/qeventdispatcher_glib.cpp:407
#45 0xb5f52ba5 in QGuiEventDispatcherGlib::processEvents (this=0x9605fd0, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#46 0xb5bced19 in QEventLoop::processEvents (this=0xbf9199d4, flags=) at kernel/qeventloop.cpp:149
#47 0xb5bcf16a in QEventLoop::exec (this=0xbf9199d4, flags=...) at kernel/qeventloop.cpp:201
#48 0xb5bd335f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#49 0xb5e95277 in QApplication::exec () at kernel/qapplication.cpp:3570
#50 0xb7892c3e in kdemain (argc=1, argv=0xbf919bd4) at ../../../../plasma/desktop/shell/main.cpp:112
#51 0x080485cb in main (argc=1, argv=0xbf919bd4) at plasma-desktop_dummy.cpp:3

Reported using DrKonqi