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 2.6.30.8-64.fc11.x86_64 x86_64
Distribution: "Fedora release 11 (Leonidas)"

What I was doing when the application crashed:
On many occasions, Switching desktops causes plasma desktop to crash. Can't correlate crash to any specific event. I have 8 virtual desktops configured.

 -- Backtrace:
Application: Plasma Workspace (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f6480afe820 (LWP 3237))]

Thread 2 (Thread 0x7f646a01f910 (LWP 3238)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x0000003854e5adfb in QWaitConditionPrivate::wait (time=<value optimized out>, this=<value optimized out>) at thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (time=<value optimized out>, this=<value optimized out>) at thread/qwaitcondition_unix.cpp:159
#3  0x0000003855c818e4 in QHostInfoAgent::run (this=0x2ac2440) at kernel/qhostinfo.cpp:260
#4  0x0000003854e59d45 in QThreadPrivate::start (arg=0x2ac2440) at thread/qthread_unix.cpp:188
#5  0x0000003c3f40686a in start_thread (arg=<value optimized out>) at pthread_create.c:297
#6  0x0000003c3e8de3bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f6480afe820 (LWP 3237)):
[KCrash Handler]
#5  0x0000000000000000 in ?? ()
#6  0x0000003856d20c2a in QGraphicsItem::setParentItem (this=0x34c01a0, parent=0x2b9e120) at graphicsview/qgraphicsitem.cpp:1024
#7  0x0000003856d705ea in QGraphicsGridLayout::addItem (this=0x2a0f2c0, item=0x34c01a0, row=<value optimized out>, column=<value optimized out>, rowSpan=<value optimized out>, 
    columnSpan=<value optimized out>, alignment={i = 0}) at graphicsview/qgraphicsgridlayout.cpp:158
#8  0x00007f646eedd26d in TaskItemLayout::layoutItems (this=0x2a0f2c0) at /usr/src/debug/kdebase-workspace-4.3.1/plasma/applets/tasks/taskitemlayout.cpp:370
#9  0x00007f646eedd95f in TaskItemLayout::insert (this=0x2a0f2c0, index=<value optimized out>, item=0x31029c0) at /usr/src/debug/kdebase-workspace-4.3.1/plasma/applets/tasks/taskitemlayout.cpp:125
#10 0x00007f646eeddb30 in TaskItemLayout::addTaskItem (this=0x2a0f2c0, item=0x31029c0) at /usr/src/debug/kdebase-workspace-4.3.1/plasma/applets/tasks/taskitemlayout.cpp:82
#11 0x00007f646eee9848 in TaskGroupItem::itemAdded (this=0x2b9e110, groupableItem=0x35fe5e0) at /usr/src/debug/kdebase-workspace-4.3.1/plasma/applets/tasks/taskgroupitem.cpp:477
#12 0x00007f646eee9e94 in TaskGroupItem::qt_metacall (this=0x2b9e110, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff66046b70)
    at /usr/src/debug/kdebase-workspace-4.3.1/x86_64-redhat-linux-gnu/plasma/applets/tasks/taskgroupitem.moc:113
#13 0x0000003854f547dc in QMetaObject::activate (sender=0x29fc980, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x7fff660465b0) at kernel/qobject.cpp:3113
#14 0x0000003ff8430fbf in TaskManager::TaskGroup::itemAdded (this=0x7fff660465c0, _t1=0x35fe5e0) at /usr/src/debug/kdebase-workspace-4.3.1/x86_64-redhat-linux-gnu/libs/taskmanager/taskgroup.moc:139
#15 0x0000003ff843189b in TaskManager::TaskGroup::add (this=0x29fc980, item=0x35fe5e0) at /usr/src/debug/kdebase-workspace-4.3.1/libs/taskmanager/taskgroup.cpp:138
#16 0x0000003ff8418705 in TaskManager::AbstractGroupingStrategy::closeGroup (this=0x361f800, group=0x3623e70)
    at /usr/src/debug/kdebase-workspace-4.3.1/libs/taskmanager/abstractgroupingstrategy.cpp:168
#17 0x0000003ff841f66b in TaskManager::ProgramGroupingStrategy::checkGroup (this=0x361f800) at /usr/src/debug/kdebase-workspace-4.3.1/libs/taskmanager/strategies/programgroupingstrategy.cpp:204
#18 0x0000003ff84202b5 in TaskManager::ProgramGroupingStrategy::qt_metacall (this=0x361f800, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=<value optimized out>)
    at /usr/src/debug/kdebase-workspace-4.3.1/x86_64-redhat-linux-gnu/libs/taskmanager/programgroupingstrategy.moc:68
#19 0x0000003854f547dc in QMetaObject::activate (sender=0x3623e70, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x7fff660465b0) at kernel/qobject.cpp:3113
#20 0x0000003ff8430f82 in TaskManager::TaskGroup::itemRemoved (this=0x7fff660465c0, _t1=0x361f360) at /usr/src/debug/kdebase-workspace-4.3.1/x86_64-redhat-linux-gnu/libs/taskmanager/taskgroup.moc:146
#21 0x0000003ff8431651 in TaskManager::TaskGroup::remove (this=0x3623e70, item=0x361f360) at /usr/src/debug/kdebase-workspace-4.3.1/libs/taskmanager/taskgroup.cpp:182
#22 0x0000003ff841b34b in TaskManager::GroupManagerPrivate::removeTask (this=0x29e1360, task={d = 0x2a8bb00}) at /usr/src/debug/kdebase-workspace-4.3.1/libs/taskmanager/groupmanager.cpp:311
#23 0x0000003ff841cfca in TaskManager::GroupManager::qt_metacall (this=0x2973370, _c=<value optimized out>, _id=<value optimized out>, _a=0x7fff66047010)
    at /usr/src/debug/kdebase-workspace-4.3.1/x86_64-redhat-linux-gnu/libs/taskmanager/groupmanager.moc:105
#24 0x0000003854f547dc in QMetaObject::activate (sender=0x29d4a90, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x7fff660465b0) at kernel/qobject.cpp:3113
#25 0x0000003ff84343c5 in TaskManager::TaskManager::taskRemoved (this=0x7fff660465c0, _t1=<value optimized out>)
    at /usr/src/debug/kdebase-workspace-4.3.1/x86_64-redhat-linux-gnu/libs/taskmanager/taskmanager.moc:162
#26 0x0000003ff8435f8d in TaskManager::TaskManager::windowRemoved (this=0x29d4a90, w=46137394) at /usr/src/debug/kdebase-workspace-4.3.1/libs/taskmanager/taskmanager.cpp:278
#27 0x0000003ff8437727 in TaskManager::TaskManager::qt_metacall (this=0x29d4a90, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff66047250)
    at /usr/src/debug/kdebase-workspace-4.3.1/x86_64-redhat-linux-gnu/libs/taskmanager/taskmanager.moc:110
#28 0x0000003854f547dc in QMetaObject::activate (sender=0x2898530, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x7fff660465b0) at kernel/qobject.cpp:3113
#29 0x0000003ff653cab2 in KWindowSystem::windowRemoved (this=0x7fff660465c0, _t1=46137394) at /usr/src/debug/kdelibs-4.3.1/x86_64-redhat-linux-gnu/kdeui/kwindowsystem.moc:127
#30 0x0000003ff653f8ba in KWindowSystemPrivate::removeClient (this=0x28927c0, w=46137394) at /usr/src/debug/kdelibs-4.3.1/kdeui/windowmanagement/kwindowsystem_x11.cpp:249
#31 0x0000003ff654d41d in NETRootInfo::update (this=0x28927e8, dirty_props=<value optimized out>) at /usr/src/debug/kdelibs-4.3.1/kdeui/windowmanagement/netwm.cpp:2183
#32 0x0000003ff654e153 in NETRootInfo::event (this=0x28927e8, event=<value optimized out>, properties=0x7fff66047560, properties_size=5)
    at /usr/src/debug/kdelibs-4.3.1/kdeui/windowmanagement/netwm.cpp:2058
#33 0x0000003ff653fb6c in KWindowSystemPrivate::x11Event (this=0x28927c0, ev=0x7fff66048f30) at /usr/src/debug/kdelibs-4.3.1/kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#34 0x0000003ff6411006 in KAppX11HackWidget::publicx11Event (e=<value optimized out>, this=<value optimized out>) at /usr/src/debug/kdelibs-4.3.1/kdeui/kernel/kapplication.cpp:900
#35 KApplication::x11EventFilter (e=<value optimized out>, this=<value optimized out>) at /usr/src/debug/kdelibs-4.3.1/kdeui/kernel/kapplication.cpp:950
#36 0x0000003ff6a4e277 in PlasmaApp::x11EventFilter (this=0x25dda40, event=0x7fff66048f30) at /usr/src/debug/kdebase-workspace-4.3.1/plasma/shells/desktop/plasmaapp.cpp:490
#37 0x00000038567e96c1 in qt_x11EventFilter (ev=0x7fff66048f30) at kernel/qapplication_x11.cpp:375
#38 0x00000038567f9a81 in QApplication::x11ProcessEvent (this=<value optimized out>, event=0x7fff66048f30) at kernel/qapplication_x11.cpp:3266
#39 0x00000038568227dc in x11EventSourceDispatch (s=<value optimized out>, callback=<value optimized out>, user_data=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:146
#40 0x0000003853e3790e in g_main_dispatch (context=<value optimized out>) at gmain.c:1824
#41 IA__g_main_context_dispatch (context=<value optimized out>) at gmain.c:2377
#42 0x0000003853e3b0e8 in g_main_context_iterate (context=0x25fa520, block=<value optimized out>, dispatch=<value optimized out>, self=<value optimized out>) at gmain.c:2455
#43 0x0000003853e3b20a in IA__g_main_context_iteration (context=0x25fa520, may_block=1) at gmain.c:2518
#44 0x0000003854f67936 in QEventDispatcherGlib::processEvents (this=0x25c57f0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#45 0x0000003856821f8e in QGuiEventDispatcherGlib::processEvents (this=0x7fff660465c0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#46 0x0000003854f3ded2 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 36}) at kernel/qeventloop.cpp:149
#47 0x0000003854f3e2a4 in QEventLoop::exec (this=0x7fff66049260, flags={i = 0}) at kernel/qeventloop.cpp:201
#48 0x0000003854f40439 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#49 0x0000003ff6a3af4f in kdemain (argc=<value optimized out>, argv=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.3.1/plasma/shells/desktop/main.cpp:50
#50 0x0000003c3e81ea2d in __libc_start_main (main=<value optimized out>, argc=<value optimized out>, ubp_av=<value optimized out>, init=<value optimized out>, fini=<value optimized out>, 
    rtld_fini=<value optimized out>, stack_end=0x7fff66049568) at libc-start.c:220
#51 0x0000000000400779 in _start ()

Reported using DrKonqi