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 2.6.31-17-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
As the title described, I just switched workspace using a keyboard shortcut.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb77d8700 (LWP 2357))]

Thread 2 (Thread 0xac6c4b70 (LWP 2358)):
#0  0x009cd422 in __kernel_vsyscall ()
#1  0x0035de15 in pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:122
#2  0x00aa787d in __pthread_cond_wait (cond=0x99d2c50, mutex=0x99d2c38) at forward.c:139
#3  0x0048fe67 in QWaitConditionPrivate::wait (this=0x99e1d90, mutex=0x99e1d8c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0x99e1d90, mutex=0x99e1d8c, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0x0921f922 in QHostInfoAgent::run (this=0x99e1d80) at kernel/qhostinfo.cpp:260
#6  0x0048ee32 in QThreadPrivate::start (arg=0x99e1d80) at thread/qthread_unix.cpp:188
#7  0x0035980e in start_thread (arg=0xac6c4b70) at pthread_create.c:300
#8  0x00a9a8de in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb77d8700 (LWP 2357)):
[KCrash Handler]
#6  0x00000001 in ?? ()
#7  0x072ade2a in TaskItemLayout::insert (this=0xa78af98, index=3, item=0x9b3aa20) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:125
#8  0x072ae00f in TaskItemLayout::addTaskItem (this=0x9860178, item=0x9b3aa20) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:82
#9  0x072bafa2 in TaskGroupItem::itemAdded (this=0x99af3d0, groupableItem=0xa4eab50) at ../../../../plasma/applets/tasks/taskgroupitem.cpp:477
#10 0x072bb627 in TaskGroupItem::qt_metacall (this=0x99af3d0, _c=QMetaObject::InvokeMetaMethod, _id=29, _a=0xbfe84658) at ./taskgroupitem.moc:113
#11 0x00595263 in QMetaObject::activate (sender=0x98660d8, from_signal_index=21, to_signal_index=21, argv=0xbfe84658) at kernel/qobject.cpp:3113
#12 0x00595ec2 in QMetaObject::activate (sender=0x98660d8, m=0x7bfabf4, local_signal_index=0, argv=0xbfe84658) at kernel/qobject.cpp:3187
#13 0x07bec433 in TaskManager::TaskGroup::itemAdded (this=0x98660d8, _t1=0xa4eab50) at ./taskgroup.moc:145
#14 0x07bece8b in TaskManager::TaskGroup::add (this=0x98660d8, item=0xa4eab50) at ../../../libs/taskmanager/taskgroup.cpp:138
#15 0x07bd4052 in TaskManager::GroupManagerPrivate::addTask (this=0x99247c0, task=) at ../../../libs/taskmanager/groupmanager.cpp:290
#16 0x07bd4a45 in TaskManager::GroupManagerPrivate::actuallyReloadTasks (this=0x99247c0) at ../../../libs/taskmanager/groupmanager.cpp:155
#17 0x07bd63be in TaskManager::GroupManager::qt_metacall (this=0x9866db8, _c=QMetaObject::InvokeMetaMethod, _id=14, _a=0xbfe8486c) at ./groupmanager.moc:108
#18 0x00595263 in QMetaObject::activate (sender=0x9924800, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#19 0x00595ec2 in QMetaObject::activate (sender=0x9924800, m=0x670904, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#20 0x005cf667 in QTimer::timeout (this=0x9924800) at .moc/release-shared/moc_qtimer.cpp:128
#21 0x0059a9ae in QTimer::timerEvent (this=0x9924800, e=0xbfe84d00) at kernel/qtimer.cpp:261
#22 0x0058f3bf in QObject::event (this=0x9924800, e=0xbfe84d00) at kernel/qobject.cpp:1075
#23 0x01368f54 in QApplicationPrivate::notify_helper (this=0x954a7f8, receiver=0x9924800, e=0xbfe84d00) at kernel/qapplication.cpp:4056
#24 0x0137067c in QApplication::notify (this=0x95239f8, receiver=0x9924800, e=0xbfe84d00) at kernel/qapplication.cpp:3603
#25 0x01088bfa in KApplication::notify (this=0x95239f8, receiver=0x9924800, event=0xbfe84d00) at ../../kdeui/kernel/kapplication.cpp:302
#26 0x0057f6cb in QCoreApplication::notifyInternal (this=0x95239f8, receiver=0x9924800, event=0xbfe84d00) at kernel/qcoreapplication.cpp:610
#27 0x005ac7ce in QCoreApplication::sendEvent (this=0x954cfac) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#28 QTimerInfoList::activateTimers (this=0x954cfac) at kernel/qeventdispatcher_unix.cpp:572
#29 0x005aa0e0 in timerSourceDispatch (source=0x954cf78) at kernel/qeventdispatcher_glib.cpp:165
#30 0x00b4be88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#31 0x00b4f730 in ?? () from /lib/libglib-2.0.so.0
#32 0x00b4f863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#33 0x005aa02c in QEventDispatcherGlib::processEvents (this=0x954a5e8, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#34 0x01409be5 in QGuiEventDispatcherGlib::processEvents (this=0x954a5e8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#35 0x0057dc79 in QEventLoop::processEvents (this=0xbfe84fc4, flags=) at kernel/qeventloop.cpp:149
#36 0x0057e0ca in QEventLoop::exec (this=0xbfe84fc4, flags=...) at kernel/qeventloop.cpp:201
#37 0x0058053f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#38 0x01368dd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#39 0x076e280d in kdemain (argc=1, argv=0x950cc10) at ../../../../plasma/shells/desktop/main.cpp:50
#40 0x0804dde1 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x94d6b68 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80511a5 "0") at ../../kinit/kinit.cpp:677
#41 0x0804ea35 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#42 0x0804eeac in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1362
#43 0x0804fbaf in main (argc=2, argv=0xbfe85824, envp=0xbfe85830) at ../../kinit/kinit.cpp:1793

This bug may be a duplicate of or related to bug 222206

Reported using DrKonqi