Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.3
Operating System: Linux 2.6.31.9-174.fc12.i686.PAE i686

What I was doing when the application crashed:
KDE desktop crashed with no reason while I was using firefox. I was not attempting to do anything on the desktop at the time.
I have 2 instances of firefox running plus one console open but I was just reading an online article at the time.

 -- Backtrace:
Application: Plasma Workspace (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0xb77c77d0 (LWP 1967))]

Thread 2 (Thread 0xac5f6b70 (LWP 1968)):
#0  0x00c8b424 in __kernel_vsyscall ()
#1  0x0097ac45 in pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S:122
#2  0x07686e5f in wait (time=<value optimized out>, this=<value optimized out>) at thread/qwaitcondition_unix.cpp:87
#3  QWaitCondition::wait (time=<value optimized out>, this=<value optimized out>) at thread/qwaitcondition_unix.cpp:159
#4  0x078f7e42 in QHostInfoAgent::run (this=<value optimized out>) at kernel/qhostinfo.cpp:260
#5  0x07685de3 in QThreadPrivate::start (arg=<value optimized out>) at thread/qthread_unix.cpp:188
#6  0x00976ab5 in start_thread (arg=<value optimized out>) at pthread_create.c:297
#7  0x008cd83e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb77c77d0 (LWP 1967)):
[KCrash Handler]
#6  0x040fe08c in QGraphicsLayoutItem::geometry (this=0x7878590) at graphicsview/qgraphicslayoutitem.cpp:664
#7  0x04101d20 in QGraphicsWidget::size (this=<value optimized out>) at graphicsview/qgraphicswidget.cpp:336
#8  0x0106830c in AbstractTaskItem::basicPreferredSize (this=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.3.4/plasma/applets/tasks/abstracttaskitem.cpp:105
#9  0x0106387b in TaskItemLayout::preferredColumns (this=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.3.4/plasma/applets/tasks/taskitemlayout.cpp:211
#10 0x0106469b in TaskItemLayout::gridLayoutSize (this=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.3.4/plasma/applets/tasks/taskitemlayout.cpp:227
#11 0x0106475a in TaskItemLayout::layoutItems (this=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.3.4/plasma/applets/tasks/taskitemlayout.cpp:250
#12 0x01065139 in TaskItemLayout::insert (this=<value optimized out>, index=<value optimized out>, item=0x9234b88)
    at /usr/src/debug/kdebase-workspace-4.3.4/plasma/applets/tasks/taskitemlayout.cpp:129
#13 0x0106534f in TaskItemLayout::addTaskItem (this=<value optimized out>, item=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.3.4/plasma/applets/tasks/taskitemlayout.cpp:82
#14 0x010728a2 in TaskGroupItem::itemAdded (this=<value optimized out>, groupableItem=0x8c33ec0) at /usr/src/debug/kdebase-workspace-4.3.4/plasma/applets/tasks/taskgroupitem.cpp:477
#15 0x01072f37 in TaskGroupItem::qt_metacall (this=<value optimized out>, _c=<value optimized out>, _id=<value optimized out>, _a=<value optimized out>)
    at /usr/src/debug/kdebase-workspace-4.3.4/i686-redhat-linux-gnu/plasma/applets/tasks/taskgroupitem.moc:113
#16 0x0778cc0c in QMetaObject::activate (sender=<value optimized out>, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=<value optimized out>)
    at kernel/qobject.cpp:3112
#17 0x0778d843 in QMetaObject::activate (sender=<value optimized out>, m=<value optimized out>, local_signal_index=<value optimized out>, argv=<value optimized out>) at kernel/qobject.cpp:3186
#18 0x07df48e4 in TaskManager::TaskGroup::itemAdded (this=<value optimized out>, _t1=0x8c33ec0) at /usr/src/debug/kdebase-workspace-4.3.4/i686-redhat-linux-gnu/libs/taskmanager/taskgroup.moc:145
#19 0x07df536b in TaskManager::TaskGroup::add (this=<value optimized out>, item=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.3.4/libs/taskmanager/taskgroup.cpp:138
#20 0x07ddc122 in TaskManager::GroupManagerPrivate::addTask (this=<value optimized out>, task=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.3.4/libs/taskmanager/groupmanager.cpp:290
#21 0x07ddcb05 in TaskManager::GroupManagerPrivate::actuallyReloadTasks (this=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.3.4/libs/taskmanager/groupmanager.cpp:155
#22 0x07dde42e in TaskManager::GroupManager::qt_metacall (this=<value optimized out>, _c=<value optimized out>, _id=14, _a=<value optimized out>)
    at /usr/src/debug/kdebase-workspace-4.3.4/i686-redhat-linux-gnu/libs/taskmanager/groupmanager.moc:108
#23 0x0778cc0c in QMetaObject::activate (sender=<value optimized out>, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=<value optimized out>)
    at kernel/qobject.cpp:3112
#24 0x0778d843 in QMetaObject::activate (sender=<value optimized out>, m=<value optimized out>, local_signal_index=<value optimized out>, argv=<value optimized out>) at kernel/qobject.cpp:3186
#25 0x077c72f8 in QTimer::timeout (this=<value optimized out>) at .moc/release-shared/moc_qtimer.cpp:128
#26 0x0779232e in QTimer::timerEvent (this=<value optimized out>, e=<value optimized out>) at kernel/qtimer.cpp:261
#27 0x07786d3f in QObject::event (this=<value optimized out>, e=<value optimized out>) at kernel/qobject.cpp:1074
#28 0x03aaab24 in QApplicationPrivate::notify_helper (this=<value optimized out>, receiver=<value optimized out>, e=<value optimized out>) at kernel/qapplication.cpp:4065
#29 0x03ab2281 in QApplication::notify (this=<value optimized out>, receiver=<value optimized out>, e=<value optimized out>) at kernel/qapplication.cpp:3605
#30 0x029b207b in KApplication::notify (this=<value optimized out>, receiver=<value optimized out>, event=<value optimized out>) at /usr/src/debug/kdelibs-4.3.4/kdeui/kernel/kapplication.cpp:302
#31 0x07776d73 in QCoreApplication::notifyInternal (this=<value optimized out>, receiver=<value optimized out>, event=<value optimized out>) at kernel/qcoreapplication.cpp:610
#32 0x077a42be in sendEvent (event=<value optimized out>, receiver=<value optimized out>) at kernel/qcoreapplication.h:213
#33 QTimerInfoList::activateTimers (event=<value optimized out>, receiver=<value optimized out>) at kernel/qeventdispatcher_unix.cpp:580
#34 0x077a1c21 in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:165
#35 0x00b8f128 in g_main_dispatch (context=<value optimized out>) at gmain.c:1960
#36 IA__g_main_context_dispatch (context=<value optimized out>) at gmain.c:2513
#37 0x00b92a58 in g_main_context_iterate (context=<value optimized out>, block=<value optimized out>, dispatch=<value optimized out>, self=<value optimized out>) at gmain.c:2591
#38 0x00b92b84 in IA__g_main_context_iteration (context=0x81f7490, may_block=<value optimized out>) at gmain.c:2654
#39 0x077a1b6d in QEventDispatcherGlib::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#40 0x03b4a356 in QGuiEventDispatcherGlib::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#41 0x077752aa in QEventLoop::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventloop.cpp:149
#42 0x0777570a in QEventLoop::exec (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventloop.cpp:201
#43 0x07777bf7 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#44 0x03aaa9a8 in QApplication::exec () at kernel/qapplication.cpp:3525
#45 0x026245e7 in kdemain (argc=<value optimized out>, argv=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.3.4/plasma/shells/desktop/main.cpp:50
#46 0x080486fc in main (argc=<value optimized out>, argv=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.3.4/i686-redhat-linux-gnu/plasma/shells/desktop/plasma-desktop_dummy.cpp:3

Reported using DrKonqi