Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.98 (KDE 4.2.98 (KDE 4.3 RC3))
Qt Version: 4.5.2
Operating System: Linux 2.6.30-1-amd64 x86_64
Distribution: Debian GNU/Linux unstable (sid)

What I was doing when the application crashed:
I am not exactly sure what I was doin. 
Either I changed desktops, or I switched to a different task.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fa1ecd89760 (LWP 13711))]

Thread 2 (Thread 0x7fa1da2a2950 (LWP 13714)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00000033bfc6d3e9 in QWaitConditionPrivate::wait (this=<value optimized out>, mutex=<value optimized out>, time=<value optimized out>) at thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=<value optimized out>, mutex=<value optimized out>, time=<value optimized out>) at thread/qwaitcondition_unix.cpp:159
#3  0x00000033c4c86fc4 in QHostInfoAgent::run (this=<value optimized out>) at kernel/qhostinfo.cpp:260
#4  0x00000033bfc6c3f5 in QThreadPrivate::start (arg=<value optimized out>) at thread/qthread_unix.cpp:188
#5  0x00000033b9a06faa in start_thread (arg=<value optimized out>) at pthread_create.c:300
#6  0x00000033b8ece29d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fa1ecd89760 (LWP 13711)):
[KCrash Handler]
#5  0x00000033c11b64e4 in QGraphicsLayoutItem::geometry (this=0x1cf4ba0) at graphicsview/qgraphicslayoutitem.cpp:664
#6  0x00000033c11b9ec5 in QGraphicsWidget::size (this=<value optimized out>) at graphicsview/qgraphicswidget.cpp:336
#7  0x00007fa1dc292c7e in AbstractTaskItem::basicPreferredSize (this=0x1fb1720) at ../../../../plasma/applets/tasks/abstracttaskitem.cpp:106
#8  0x00007fa1dc28f1a6 in TaskItemLayout::preferredColumns (this=0x1222c10) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:206
#9  0x00007fa1dc28fb1c in TaskItemLayout::gridLayoutSize (this=0x1222c10) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:222
#10 0x00007fa1dc28fbab in TaskItemLayout::layoutItems (this=0x7fff784ab5e0) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:245
#11 0x00007fa1dc290744 in TaskItemLayout::insert (this=0x1222c10, index=11, item=0x1c48f20) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:125
#12 0x00007fa1dc290928 in TaskItemLayout::addTaskItem (this=0x1222c10, item=0x1c48f20) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:82
#13 0x00007fa1dc29c318 in TaskGroupItem::itemAdded (this=0x12223a0, groupableItem=0x1f73050) at ../../../../plasma/applets/tasks/taskgroupitem.cpp:477
#14 0x00007fa1dc29c902 in TaskGroupItem::qt_metacall (this=0x12223a0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff784abc50) at ./taskgroupitem.moc:113
#15 0x00000033bfd67602 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
#16 0x00007fa1dc4d547f in TaskManager::TaskGroup::itemAdded (this=0x7fff784ab5e0, _t1=0x1f73050) at ./taskgroup.moc:139
#17 0x00007fa1dc4d5fab in TaskManager::TaskGroup::add (this=0x1151d70, item=0x1f73050) at ../../../libs/taskmanager/taskgroup.cpp:138
#18 0x00007fa1dc4c501f in TaskManager::ProgramGroupingStrategy::handleItem (this=0x1fbdd20, item=0x1f73050) at ../../../libs/taskmanager/strategies/programgroupingstrategy.cpp:154
#19 0x00007fa1dc4beb6d in TaskManager::GroupManagerPrivate::addTask (this=0x11516a0, task=...) at ../../../libs/taskmanager/groupmanager.cpp:288
#20 0x00007fa1dc4bf891 in TaskManager::GroupManagerPrivate::actuallyReloadTasks (this=0x11516a0) at ../../../libs/taskmanager/groupmanager.cpp:155
#21 0x00007fa1dc4c0cd2 in TaskManager::GroupManager::qt_metacall (this=0xeba120, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff784abf10) at ./groupmanager.moc:108
#22 0x00000033bfd67602 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
#23 0x00000033bfd61b73 in QObject::event (this=<value optimized out>, e=<value optimized out>) at kernel/qobject.cpp:1074
#24 0x00000033c0bd77ad in QApplicationPrivate::notify_helper (this=<value optimized out>, receiver=<value optimized out>, e=<value optimized out>) at kernel/qapplication.cpp:4056
#25 0x00000033c0bdf80a in QApplication::notify (this=<value optimized out>, receiver=<value optimized out>, e=<value optimized out>) at kernel/qapplication.cpp:4021
#26 0x00000033c9a23b2b in KApplication::notify (this=<value optimized out>, receiver=<value optimized out>, event=<value optimized out>) at ../../kdeui/kernel/kapplication.cpp:302
#27 0x00000033bfd5249c in QCoreApplication::notifyInternal (this=<value optimized out>, receiver=<value optimized out>, event=<value optimized out>) at kernel/qcoreapplication.cpp:610
#28 0x00000033bfd7e7a6 in QCoreApplication::sendEvent (this=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#29 QTimerInfoList::activateTimers (this=<value optimized out>) at kernel/qeventdispatcher_unix.cpp:572
#30 0x00000033bfd7ac1d in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:165
#31 0x00000033baa397aa in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#32 0x00000033baa3cdf8 in ?? () from /usr/lib/libglib-2.0.so.0
#33 0x00000033baa3cfac in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#34 0x00000033bfd7ab7f in QEventDispatcherGlib::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#35 0x00000033c0c6e5ef in QGuiEventDispatcherGlib::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#36 0x00000033bfd50d62 in QEventLoop::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventloop.cpp:149
#37 0x00000033bfd51134 in QEventLoop::exec (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventloop.cpp:201
#38 0x00000033bfd533a4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#39 0x00000033c183d1bb in kdemain (argc=<value optimized out>, argv=<value optimized out>) at ../../../../plasma/shells/desktop/main.cpp:50
#40 0x0000000000407264 in launch (argc=1, _name=0x963b68 "/usr/bin/plasma-desktop", args=<value optimized out>, cwd=0x0, envc=0, envs=0x963b88 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x40a127 "0") at ../../kinit/kinit.cpp:676
#41 0x0000000000407a28 in handle_launcher_request (sock=7, who=<value optimized out>) at ../../kinit/kinit.cpp:1168
#42 0x0000000000407fae in handle_requests (waitForPid=0) at ../../kinit/kinit.cpp:1361
#43 0x000000000040863b in main (argc=2, argv=0x7fff784ad6e8, envp=0x7fff784ad700) at ../../kinit/kinit.cpp:1788

Reported using DrKonqi