Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-14-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
while I was installing new packages recommended by nepomuk app, I clicked on desktop 2, in order to switch to an empty workspace.
Plasma crashed and restarted.I am not sure if this happened because I change my desktop wallpaper a few seconds before starting to install the new packages.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb77d9700 (LWP 1795))]

Thread 2 (Thread 0xab84db70 (LWP 1837)):
#0  0x00246422 in __kernel_vsyscall ()
#1  0x0036de15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x08c4e78d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x003cee67 in QWaitConditionPrivate::wait (this=0x9aeb578, mutex=0x9aeb574, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0x9aeb578, mutex=0x9aeb574, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0x01551922 in QHostInfoAgent::run (this=0x9aeb568) at kernel/qhostinfo.cpp:260
#6  0x003cde32 in QThreadPrivate::start (arg=0x9aeb568) at thread/qthread_unix.cpp:188
#7  0x0036980e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0x08c417ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb77d9700 (LWP 1795)):
[KCrash Handler]
#6  0x0035003c in ?? () from /usr/lib/liblzma.so.0
#7  0x02bd62d0 in Plasma::ToolTipManager::setContent (this=0x935b598, widget=0x96a8950, data=...) at ../../plasma/tooltipmanager.cpp:225
#8  0x087b6cf5 in Pager::updateToolTip (this=0x96a8950) at ../../../../plasma/applets/pager/pager.cpp:1293
#9  0x087b72c7 in Pager::handleHoverMove (this=0x96a8950, pos=...) at ../../../../plasma/applets/pager/pager.cpp:875
#10 0x087b7654 in Pager::hoverEnterEvent (this=0x96a8950, event=0xbf9a56fc) at ../../../../plasma/applets/pager/pager.cpp:922
#11 0x04ead87a in QGraphicsItem::sceneEvent (this=0x96a8958, event=0xbf9a56fc) at graphicsview/qgraphicsitem.cpp:5015
#12 0x04efa9ef in QGraphicsWidget::sceneEvent (this=0x96a8950, event=0xbf9a56fc) at graphicsview/qgraphicswidget.cpp:1110
#13 0x04ecfe14 in QGraphicsScenePrivate::sendEvent (this=0x9335290, item=0x96a8958, event=0xbf9a56fc) at graphicsview/qgraphicsscene.cpp:1159
#14 0x04ed172e in QGraphicsScenePrivate::sendHoverEvent (this=0x9335290, type=QEvent::GraphicsSceneHoverEnter, item=0x96a8958, hoverEvent=0xbf9a580c) at graphicsview/qgraphicsscene.cpp:1206
#15 0x04edc118 in QGraphicsScenePrivate::dispatchHoverEvent (this=0x9335290, hoverEvent=0xbf9a580c) at graphicsview/qgraphicsscene.cpp:4266
#16 0x04edc508 in QGraphicsScene::mouseMoveEvent (this=0x931d350, mouseEvent=0xbf9a5c70) at graphicsview/qgraphicsscene.cpp:4414
#17 0x04eddfc7 in QGraphicsScene::event (this=0x931d350, event=0xbf9a5c70) at graphicsview/qgraphicsscene.cpp:3802
#18 0x048a1f54 in QApplicationPrivate::notify_helper (this=0x9274f50, receiver=0x931d350, e=0xbf9a5c70) at kernel/qapplication.cpp:4056
#19 0x048a967c in QApplication::notify (this=0x924e0e8, receiver=0x931d350, e=0xbf9a5c70) at kernel/qapplication.cpp:3603
#20 0x00eedbfa in KApplication::notify (this=0x924e0e8, receiver=0x931d350, event=0xbf9a5c70) at ../../kdeui/kernel/kapplication.cpp:302
#21 0x004be6cb in QCoreApplication::notifyInternal (this=0x924e0e8, receiver=0x931d350, event=0xbf9a5c70) at kernel/qcoreapplication.cpp:610
#22 0x04eeae9f in QCoreApplication::sendEvent (this=0x972bd28, event=0xbf9a6300) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#23 QGraphicsViewPrivate::mouseMoveEventHandler (this=0x972bd28, event=0xbf9a6300) at graphicsview/qgraphicsview.cpp:605
#24 0x04eefd83 in QGraphicsView::mouseMoveEvent (this=0x92a0cf0, event=0xbf9a6300) at graphicsview/qgraphicsview.cpp:3321
#25 0x048f6e63 in QWidget::event (this=0x92a0cf0, event=0xbf9a6300) at kernel/qwidget.cpp:7534
#26 0x04ca6633 in QFrame::event (this=0x92a0cf0, e=0xbf9a6300) at widgets/qframe.cpp:559
#27 0x04d45494 in QAbstractScrollArea::viewportEvent (this=0x96a8958, e=0x2a0cf000) at widgets/qabstractscrollarea.cpp:962
#28 0x04eef51f in QGraphicsView::viewportEvent (this=0x92a0cf0, event=0xbf9a6300) at graphicsview/qgraphicsview.cpp:2919
#29 0x04d47a95 in QAbstractScrollAreaPrivate::viewportEvent (this=0x972fa30, o=0x971c630, e=0xbf9a6300) at widgets/qabstractscrollarea_p.h:100
#30 QAbstractScrollAreaFilter::eventFilter (this=0x972fa30, o=0x971c630, e=0xbf9a6300) at widgets/qabstractscrollarea_p.h:111
#31 0x004bd83a in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x9274f50, receiver=0x971c630, event=0xbf9a6300) at kernel/qcoreapplication.cpp:726
#32 0x048a1f2c in QApplicationPrivate::notify_helper (this=0x9274f50, receiver=0x971c630, e=0xbf9a6300) at kernel/qapplication.cpp:4052
#33 0x048aa033 in QApplication::notify (this=0x924e0e8, receiver=0x971c630, e=0xbf9a6300) at kernel/qapplication.cpp:3758
#34 0x00eedbfa in KApplication::notify (this=0x924e0e8, receiver=0x971c630, event=0xbf9a6300) at ../../kdeui/kernel/kapplication.cpp:302
#35 0x004be6cb in QCoreApplication::notifyInternal (this=0x924e0e8, receiver=0x971c630, event=0xbf9a6300) at kernel/qcoreapplication.cpp:610
#36 0x048a8f6e in QCoreApplication::sendSpontaneousEvent (receiver=0x971c630, event=0xbf9a6300, alienWidget=0x971c630, nativeWidget=0x92a0cf0, buttonDown=0x511caa0, lastMouseReceiver=...)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#37 QApplicationPrivate::sendMouseEvent (receiver=0x971c630, event=0xbf9a6300, alienWidget=0x971c630, nativeWidget=0x92a0cf0, buttonDown=0x511caa0, lastMouseReceiver=...)
    at kernel/qapplication.cpp:2924
#38 0x049177c0 in QETWidget::translateMouseEvent (this=0x92a0cf0, event=0xbf9a794c) at kernel/qapplication_x11.cpp:4409
#39 0x04916c4b in QApplication::x11ProcessEvent (this=0x924e0e8, event=0xbf9a794c) at kernel/qapplication_x11.cpp:3428
#40 0x04943502 in x11EventSourceDispatch (s=0x9277b68, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#41 0x0027fe78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#42 0x00283720 in ?? () from /lib/libglib-2.0.so.0
#43 0x00283853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#44 0x004e902c in QEventDispatcherGlib::processEvents (this=0x9274d40, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#45 0x04942be5 in QGuiEventDispatcherGlib::processEvents (this=0x9274d40, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#46 0x004bcc79 in QEventLoop::processEvents (this=0xbf9a7c44, flags=) at kernel/qeventloop.cpp:149
#47 0x004bd0ca in QEventLoop::exec (this=0xbf9a7c44, flags=...) at kernel/qeventloop.cpp:201
#48 0x004bf53f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#49 0x048a1dd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#50 0x041bd80d in kdemain (argc=1, argv=0x9237518) at ../../../../plasma/shells/desktop/main.cpp:50
#51 0x0804dde1 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x9237728 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80511a5 "0") at ../../kinit/kinit.cpp:677
#52 0x0804ea35 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#53 0x0804eeac in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1362
#54 0x0804fbaf in main (argc=2, argv=0xbf9a84a4, envp=0xbf9a84b0) at ../../kinit/kinit.cpp:1793

This bug may be a duplicate of or related to bug 212483

Reported using DrKonqi