Application: plasma-desktop (0.3)
KDE Platform Version: 4.3.95 (KDE 4.3.95 (KDE 4.4 RC2))
Qt Version: 4.6.0
Operating System: Linux 2.6.31-18-generic i686
Distribution: Ubuntu 9.10

-- Information about the crash:
I added the Show desktop widget then I closed the Panel settings. I clicked on the Show desktop widget and the widget unexpectedly crashed. This bug is reproducible.

The crash can be reproduced every time.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb78ab760 (LWP 8088))]

Thread 2 (Thread 0xaa0d5b70 (LWP 8090)):
#0  0x00903422 in __kernel_vsyscall ()
#1  0x00379e15 in pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:122
#2  0x00697307 in QWaitConditionPrivate::wait (this=0x90df358, mutex=0x90df354, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#3  QWaitCondition::wait (this=0x90df358, mutex=0x90df354, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#4  0x08597102 in QHostInfoAgent::run (this=0x90df348) at kernel/qhostinfo.cpp:252
#5  0x006963ae in QThreadPrivate::start (arg=0x90df348) at thread/qthread_unix.cpp:244
#6  0x0037580e in start_thread (arg=0xaa0d5b70) at pthread_create.c:300
#7  0x009d08de in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb78ab760 (LWP 8088)):
[KCrash Handler]
#6  qt_closestLeaf (start=<value optimized out>, end=<value optimized out>, t=@0x99c9888, lessThan=<value optimized out>) at graphicsview/qgraphicsitem_p.h:718
#7  qt_notclosestLeaf (start=<value optimized out>, end=<value optimized out>, t=@0x99c9888, lessThan=<value optimized out>) at graphicsview/qgraphicsitem_p.h:730
#8  qSortHelper<QList<QGraphicsItem*>::iterator, QGraphicsItem*, bool (*)(QGraphicsItem const*, QGraphicsItem const*)> (start=<value optimized out>, end=<value optimized out>, t=@0x99c9888, 
    lessThan=<value optimized out>) at ../../include/QtCore/../../src/corelib/tools/qalgorithms.h:366
#9  0x024be2e4 in qSort<QList<QGraphicsItem*>::iterator, bool (*)(QGraphicsItem const*, QGraphicsItem const*)> (this=0x89d0360, rect=..., order=Qt::AscendingOrder)
    at ../../include/QtCore/../../src/corelib/tools/qalgorithms.h:187
#10 QGraphicsScenePrivate::ensureSortedTopLevelItems (this=0x89d0360, rect=..., order=Qt::AscendingOrder) at graphicsview/qgraphicsscene_p.h:268
#11 QGraphicsSceneIndex::estimateTopLevelItems (this=0x89d0360, rect=..., order=Qt::AscendingOrder) at graphicsview/qgraphicssceneindex.cpp:545
#12 0x024bea28 in QGraphicsSceneIndexPrivate::items_helper (this=0x89d0360, rect=..., mode=Qt::IntersectsItemShape, order=Qt::DescendingOrder, deviceTransform=...)
    at graphicsview/qgraphicssceneindex_p.h:157
#13 QGraphicsSceneIndex::items (this=0x89d0360, rect=..., mode=Qt::IntersectsItemShape, order=Qt::DescendingOrder, deviceTransform=...) at graphicsview/qgraphicssceneindex.cpp:457
#14 0x0249331b in QGraphicsScene::items (this=0x89fe5e8, rect=..., mode=Qt::IntersectsItemShape, order=Qt::DescendingOrder, deviceTransform=...) at graphicsview/qgraphicsscene.cpp:2024
#15 0x0249aa55 in QGraphicsScenePrivate::itemsAtPosition (this=0x89ab4a0, screenPos=..., scenePos=..., widget=0x93669e0) at graphicsview/qgraphicsscene.cpp:1023
#16 0x0249af20 in QGraphicsScenePrivate::dispatchHoverEvent (this=0x89ab4a0, hoverEvent=0xbfd4847c) at graphicsview/qgraphicsscene.cpp:3768
#17 0x0249b1d8 in QGraphicsScene::mouseMoveEvent (this=0x89fe5e8, mouseEvent=0xbfd48994) at graphicsview/qgraphicsscene.cpp:3976
#18 0x024aa3cd in QGraphicsScene::event (this=0x89fe5e8, event=0xbfd48994) at graphicsview/qgraphicsscene.cpp:3341
#19 0x01e0519c in QApplicationPrivate::notify_helper (this=0x893a648, receiver=0x89fe5e8, e=0xbfd48994) at kernel/qapplication.cpp:4242
#20 0x01e0bdf7 in QApplication::notify (this=0x8934540, receiver=0x89fe5e8, e=0xbfd48994) at kernel/qapplication.cpp:3661
#21 0x010c4a1a in KApplication::notify (this=0x8934540, receiver=0x89fe5e8, event=0xbfd48994) at ../../kdeui/kernel/kapplication.cpp:302
#22 0x00797eab in QCoreApplication::notifyInternal (this=0x8934540, receiver=0x89fe5e8, event=0xbfd48994) at kernel/qcoreapplication.cpp:704
#23 0x01e0607e in QCoreApplication::sendSpontaneousEvent (receiver=0x89fe5e8, event=0x99c98a0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#24 qt_sendSpontaneousEvent (receiver=0x89fe5e8, event=0x99c98a0) at kernel/qapplication.cpp:5219
#25 0x024ca852 in QGraphicsViewPrivate::mouseMoveEventHandler (this=0x9353718, event=0xbfd49160) at graphicsview/qgraphicsview.cpp:617
#26 0x024caa96 in QGraphicsView::mouseMoveEvent (this=0x9353238, event=0xbfd49160) at graphicsview/qgraphicsview.cpp:3157
#27 0x01e61fd6 in QWidget::event (this=0x9353238, event=0xbfd49160) at kernel/qwidget.cpp:7959
#28 0x0225b433 in QFrame::event (this=0x9353238, e=0xbfd49160) at widgets/qframe.cpp:557
#29 0x022f4cf2 in QAbstractScrollArea::viewportEvent (this=0x9ada148, e=0x99c98a0) at widgets/qabstractscrollarea.cpp:1032
#30 0x024c839b in QGraphicsView::viewportEvent (this=0x9353238, event=0xbfd49160) at graphicsview/qgraphicsview.cpp:2747
#31 0x022f75e5 in QAbstractScrollAreaPrivate::viewportEvent (this=0x9364d70, o=0x93669e0, e=0xbfd49160) at widgets/qabstractscrollarea_p.h:100
#32 QAbstractScrollAreaFilter::eventFilter (this=0x9364d70, o=0x93669e0, e=0xbfd49160) at widgets/qabstractscrollarea_p.h:116
#33 0x0079714a in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x893a648, receiver=0x93669e0, event=0xbfd49160) at kernel/qcoreapplication.cpp:819
#34 0x01e05179 in QApplicationPrivate::notify_helper (this=0x893a648, receiver=0x93669e0, e=0xbfd49160) at kernel/qapplication.cpp:4238
#35 0x01e0c76b in QApplication::notify (this=0x8934540, receiver=0x93669e0, e=0xbfd49160) at kernel/qapplication.cpp:3822
#36 0x010c4a1a in KApplication::notify (this=0x8934540, receiver=0x93669e0, event=0xbfd49160) at ../../kdeui/kernel/kapplication.cpp:302
#37 0x00797eab in QCoreApplication::notifyInternal (this=0x8934540, receiver=0x93669e0, event=0xbfd49160) at kernel/qcoreapplication.cpp:704
#38 0x01e0b71f in QCoreApplication::sendEvent (receiver=0x93669e0, event=0xbfd49160, alienWidget=0x93669e0, nativeWidget=0x9353238, buttonDown=0x2740060, lastMouseReceiver=..., spontaneous=true)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#39 QApplicationPrivate::sendMouseEvent (receiver=0x93669e0, event=0xbfd49160, alienWidget=0x93669e0, nativeWidget=0x9353238, buttonDown=0x2740060, lastMouseReceiver=..., spontaneous=true)
    at kernel/qapplication.cpp:2956
#40 0x01e94d18 in QETWidget::translateMouseEvent (this=0x9353238, event=0xbfd4967c) at kernel/qapplication_x11.cpp:4368
#41 0x01e93d14 in QApplication::x11ProcessEvent (this=0x8934540, event=0xbfd4967c) at kernel/qapplication_x11.cpp:3501
#42 0x01ec304a in x11EventSourceDispatch (s=0x893cd08, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#43 0x058b1e88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#44 0x058b5730 in ?? () from /lib/libglib-2.0.so.0
#45 0x058b5863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#46 0x007c3bd5 in QEventDispatcherGlib::processEvents (this=0x893a438, flags=...) at kernel/qeventdispatcher_glib.cpp:407
#47 0x01ec2b75 in QGuiEventDispatcherGlib::processEvents (this=0x893a438, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#48 0x007964c9 in QEventLoop::processEvents (this=0xbfd49974, flags=) at kernel/qeventloop.cpp:149
#49 0x0079691a in QEventLoop::exec (this=0xbfd49974, flags=...) at kernel/qeventloop.cpp:201
#50 0x0079ab0f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#51 0x01e05237 in QApplication::exec () at kernel/qapplication.cpp:3570
#52 0x014511ee in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#53 0x0804dff7 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x892b6a8 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x8051429 "0") at ../../kinit/kinit.cpp:706
#54 0x0804ec15 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1198
#55 0x0804f08c in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1391
#56 0x0804fe27 in main (argc=4, argv=0xbfd4a424, envp=0xbfd4a438) at ../../kinit/kinit.cpp:1830

Possible duplicates by query: bug 224802, bug 224493, bug 224461, bug 223991.

Reported using DrKonqi