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 2.6.31-17-generic-pae i686
Distribution: Ubuntu 9.10

-- Information about the crash:
Plasma workspace consistently crashes when an attempt is made to add an (ill-behaving or incompatible?) widget to a panel. In my case, both fancy tasks and smooth tasks cause this crash.

Even though this is not stricty a problem caused by the KDE infrastrcture, I believe that the workspace should be more robust against such widgets. I could, for example, warn the user or prohibit the use of such a plugin, instead of crashing.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb567f700 (LWP 5336))]

Thread 2 (Thread 0xa533db70 (LWP 5337)):
#0  0xb782f430 in __kernel_vsyscall ()
#1  0xb6b83e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb6bfa307 in QWaitConditionPrivate::wait (this=0x9889e80, mutex=0x9889e7c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#3  QWaitCondition::wait (this=0x9889e80, mutex=0x9889e7c, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#4  0xb5e2c102 in QHostInfoAgent::run (this=0x9889e70) at kernel/qhostinfo.cpp:252
#5  0xb6bf93ae in QThreadPrivate::start (arg=0x9889e70) at thread/qthread_unix.cpp:244
#6  0xb6b7f80e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb5f9b8de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb567f700 (LWP 5336)):
[KCrash Handler]
#6  0x00000001 in ?? ()
#7  0xa6ce3f62 in ?? () from /usr/lib/kde4/plasma_applet_fancytasks.so
#8  0xb5393047 in Plasma::Containment::addApplet (this=0xa60a010, applet=0xa60a010, pos=..., delayInit=false) at ../../plasma/containment.cpp:961
#9  0xb53933cd in Plasma::ContainmentPrivate::addApplet (this=0x93046e8, name=..., args=..., appletGeometry=..., id=0, delayInit=<value optimized out>) at ../../plasma/containment.cpp:2283
#10 0xb5393649 in Plasma::Containment::addApplet (this=0x9338fc8, name=..., args=..., appletGeometry=...) at ../../plasma/containment.cpp:892
#11 0xb20d3180 in Plasma::WidgetExplorer::addApplet (this=0x94305c8, appletItem=0xa52f8c8) at ../../../libs/plasmagenericshell/widgetsExplorer/widgetexplorer.cpp:374
#12 0xb20d5b1f in Plasma::WidgetExplorer::qt_metacall (this=0x94305c8, _c=QMetaObject::InvokeMetaMethod, _id=17, _a=0xbf9bb928) at ./widgetexplorer.moc:89
#13 0xb6d0011a in QMetaObject::metacall (object=0x94305c8, cl=174201024, idx=17, argv=0xbf9bb928) at kernel/qmetaobject.cpp:237
#14 0xb6d0e89b in QMetaObject::activate (sender=0x947d290, m=0xb20dd470, local_signal_index=0, argv=0xbf9bb928) at kernel/qobject.cpp:3294
#15 0xb20aeb73 in AppletsListWidget::appletDoubleClicked (this=0x947d290, _t1=0xa52f8c8) at moc_appletslist.cpp:132
#16 0xb20cf5ec in AppletsListWidget::appletIconDoubleClicked (this=0x947d290, applet=0xa524350) at ../../../libs/plasmagenericshell/widgetsExplorer/appletslist.cpp:428
#17 0xb20af3f7 in AppletsListWidget::qt_metacall (this=0x947d290, _c=QMetaObject::InvokeMetaMethod, _id=23, _a=0xbf9bba78) at moc_appletslist.cpp:113
#18 0xb6d0011a in QMetaObject::metacall (object=0x947d290, cl=174201024, idx=23, argv=0xbf9bba78) at kernel/qmetaobject.cpp:237
#19 0xb6d0e89b in QMetaObject::activate (sender=0xa524350, m=0xb20dd480, local_signal_index=3, argv=0xbf9bba78) at kernel/qobject.cpp:3294
#20 0xb20aea33 in AppletIconWidget::doubleClicked (this=0xa524350, _t1=0xa524350) at moc_appleticon.cpp:115
#21 0xb20c8a9a in AppletIconWidget::mouseDoubleClickEvent (this=0xa524350, event=0xbf9bc294) at ../../../libs/plasmagenericshell/widgetsExplorer/appleticon.cpp:131
#22 0xb68aa79e in QGraphicsItem::sceneEvent (this=0xa524358, event=0xbf9bc294) at graphicsview/qgraphicsitem.cpp:6534
#23 0xb69072b7 in QGraphicsWidget::sceneEvent (this=0xa524350, event=0xbf9bc294) at graphicsview/qgraphicswidget.cpp:1131
#24 0xb68cbf6f in QGraphicsScenePrivate::sendEvent (this=0x9067888, item=0xa524358, event=0xbf9bc294) at graphicsview/qgraphicsscene.cpp:1138
#25 0xb68ce64b in QGraphicsScenePrivate::sendMouseEvent (this=0x9067888, mouseEvent=0xbf9bc294) at graphicsview/qgraphicsscene.cpp:1212
#26 0xb68dd8f2 in QGraphicsScenePrivate::mousePressEventHandler (this=0x9067888, mouseEvent=0xbf9bc294) at graphicsview/qgraphicsscene.cpp:1335
#27 0xb68e1334 in QGraphicsScene::event (this=0x8ffc990, event=0xbf9bc294) at graphicsview/qgraphicsscene.cpp:3351
#28 0xb623c19c in QApplicationPrivate::notify_helper (this=0x8f5b028, receiver=0x8ffc990, e=0xbf9bc294) at kernel/qapplication.cpp:4242
#29 0xb6242df7 in QApplication::notify (this=0x8f54910, receiver=0x8ffc990, e=0xbf9bc294) at kernel/qapplication.cpp:3661
#30 0xb6fee67a in KApplication::notify (this=0x8f54910, receiver=0x8ffc990, event=0xbf9bc294) at ../../kdeui/kernel/kapplication.cpp:302
#31 0xb6cfaeab in QCoreApplication::notifyInternal (this=0x8f54910, receiver=0x8ffc990, event=0xbf9bc294) at kernel/qcoreapplication.cpp:704
#32 0xb623d07e in QCoreApplication::sendSpontaneousEvent (receiver=0x8ffc990, event=0xbf9bb440) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#33 qt_sendSpontaneousEvent (receiver=0x8ffc990, event=0xbf9bb440) at kernel/qapplication.cpp:5219
#34 0xb6900fad in QGraphicsView::mouseDoubleClickEvent (this=0xa3c0398, event=0xbf9bc990) at graphicsview/qgraphicsview.cpp:3003
#35 0xb6298fba in QWidget::event (this=0xa3c0398, event=0xbf9bc990) at kernel/qwidget.cpp:7978
#36 0xb6692433 in QFrame::event (this=0xa3c0398, e=0xbf9bc990) at widgets/qframe.cpp:557
#37 0xb672bcf2 in QAbstractScrollArea::viewportEvent (this=0xa6218c0, e=0xbf9bb440) at widgets/qabstractscrollarea.cpp:1032
#38 0xb68ff39b in QGraphicsView::viewportEvent (this=0xa3c0398, event=0xbf9bc990) at graphicsview/qgraphicsview.cpp:2747
#39 0xb672e5e5 in QAbstractScrollAreaPrivate::viewportEvent (this=0xa080058, o=0x9dd5798, e=0xbf9bc990) at widgets/qabstractscrollarea_p.h:100
#40 QAbstractScrollAreaFilter::eventFilter (this=0xa080058, o=0x9dd5798, e=0xbf9bc990) at widgets/qabstractscrollarea_p.h:116
#41 0xb6cfa14a in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x8f5b028, receiver=0x9dd5798, event=0xbf9bc990) at kernel/qcoreapplication.cpp:819
#42 0xb623c179 in QApplicationPrivate::notify_helper (this=0x8f5b028, receiver=0x9dd5798, e=0xbf9bc990) at kernel/qapplication.cpp:4238
#43 0xb624376b in QApplication::notify (this=0x8f54910, receiver=0x9dd5798, e=0xbf9bc990) at kernel/qapplication.cpp:3822
#44 0xb6fee67a in KApplication::notify (this=0x8f54910, receiver=0x9dd5798, event=0xbf9bc990) at ../../kdeui/kernel/kapplication.cpp:302
#45 0xb6cfaeab in QCoreApplication::notifyInternal (this=0x8f54910, receiver=0x9dd5798, event=0xbf9bc990) at kernel/qcoreapplication.cpp:704
#46 0xb624271f in QCoreApplication::sendEvent (receiver=0x9dd5798, event=0xbf9bc990, alienWidget=0x9dd5798, nativeWidget=0xa3637a8, buttonDown=0xb6b77060, lastMouseReceiver=..., spontaneous=true)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#47 QApplicationPrivate::sendMouseEvent (receiver=0x9dd5798, event=0xbf9bc990, alienWidget=0x9dd5798, nativeWidget=0xa3637a8, buttonDown=0xb6b77060, lastMouseReceiver=..., spontaneous=true)
    at kernel/qapplication.cpp:2956
#48 0xb62cbd18 in QETWidget::translateMouseEvent (this=0xa3637a8, event=0xbf9bceac) at kernel/qapplication_x11.cpp:4368
#49 0xb62cb1f1 in QApplication::x11ProcessEvent (this=0x8f54910, event=0xbf9bceac) at kernel/qapplication_x11.cpp:3379
#50 0xb62fa04a in x11EventSourceDispatch (s=0x8f5d0c8, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#51 0xb5a17e88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#52 0xb5a1b730 in ?? () from /lib/libglib-2.0.so.0
#53 0xb5a1b863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#54 0xb6d26bd5 in QEventDispatcherGlib::processEvents (this=0x8f5a300, flags=...) at kernel/qeventdispatcher_glib.cpp:407
#55 0xb62f9b75 in QGuiEventDispatcherGlib::processEvents (this=0x8f5a300, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#56 0xb6cf94c9 in QEventLoop::processEvents (this=0xbf9bd1a4, flags=) at kernel/qeventloop.cpp:149
#57 0xb6cf991a in QEventLoop::exec (this=0xbf9bd1a4, flags=...) at kernel/qeventloop.cpp:201
#58 0xb6cfdb0f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#59 0xb623c237 in QApplication::exec () at kernel/qapplication.cpp:3570
#60 0xb2431c7e in kdemain (argc=1, argv=0x8f4c1b0) at ../../../../plasma/desktop/shell/main.cpp:112
#61 0x0804dff7 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x8f48c40 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x8051429 "0") at ../../kinit/kinit.cpp:706
#62 0x0804ec15 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1198
#63 0x0804f08c in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1391
#64 0x0804fe27 in main (argc=4, argv=0xbf9bdc54, envp=0xbf9bdc68) at ../../kinit/kinit.cpp:1830

Possible duplicates by query: bug 219644, bug 219243, bug 218470, bug 218412, bug 217327.

Reported using DrKonqi