Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.95 (KDE 4.2.95 (KDE 4.3 RC1))
Qt Version: 4.5.0
Operating System: Linux 2.6.28-13-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
When trying to set the configuration for the screensaver, desktop crashes. I installed the packages kscreensaver, kscreensaver-xsavers, kscreensaver-xsavers-extra and kscreensaver-xsavers-webcollage. I opened Screensaver Preferences, selected HyperCube and tested it selecting Lock Screen Now from the File Menu. Then desktop crashed.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 5453)]

Thread 2 (Thread 0xa9002b90 (LWP 5520)):
#0  0xb7f6a430 in __kernel_vsyscall ()
#1  0xb64370e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb66172ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7d6a9b2 in QWaitCondition::wait (this=0x8fe5d78, mutex=0x8fe5d74, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb76a6152 in QHostInfoAgent::run (this=0x8fe5d68) at kernel/qhostinfo.cpp:260
#5  0xb7d6996e in QThreadPrivate::start (arg=0x8fe5d68) at thread/qthread_unix.cpp:189
#6  0xb64334ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb660849e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb5f41a10 (LWP 5453)):
[KCrash Handler]
#6  TaskManager::GroupManager::manualSortingRequest (this=0x0, taskItem=0x9a10860, newIndex=3) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:363
#7  0xa946531b in TaskManager::AbstractGroupingStrategy::closeGroup (this=0x8f751a0, group=0x996f7a0) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/abstractgroupingstrategy.cpp:167
#8  0xa946cf27 in TaskManager::ProgramGroupingStrategy::checkGroup (this=0x8f751a0) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/strategies/programgroupingstrategy.cpp:204
#9  0xa946de5b in TaskManager::ProgramGroupingStrategy::qt_metacall (this=0x8f751a0, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbfe8744c)
    at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/programgroupingstrategy.moc:68
#10 0xb7e73ca8 in QMetaObject::activate (sender=0x996f7a0, from_signal_index=22, to_signal_index=22, argv=0xbfe8744c) at kernel/qobject.cpp:3069
#11 0xb7e74932 in QMetaObject::activate (sender=0x996f7a0, m=0xa948fb74, local_signal_index=1, argv=0xbfe8744c) at kernel/qobject.cpp:3143
#12 0xa9480d83 in TaskManager::TaskGroup::itemRemoved (this=0x996f7a0, _t1=0x913b698) at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/taskgroup.moc:146
#13 0xa94817ab in TaskManager::TaskGroup::remove (this=0x996f7a0, item=0x913b698) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/taskgroup.cpp:182
#14 0xa9467ba5 in TaskManager::GroupManagerPrivate::removeTask (this=0x8f1e7a0, task={d = 0xbfe874fc}) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:311
#15 0xa946a46a in TaskManager::GroupManager::qt_metacall (this=0x8f76318, _c=QMetaObject::InvokeMetaMethod, _id=11, _a=0xbfe875dc)
    at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/groupmanager.moc:105
#16 0xb7e73ca8 in QMetaObject::activate (sender=0x8f796f8, from_signal_index=5, to_signal_index=5, argv=0xbfe875dc) at kernel/qobject.cpp:3069
#17 0xb7e74932 in QMetaObject::activate (sender=0x8f796f8, m=0xa948fd3c, local_signal_index=1, argv=0xbfe875dc) at kernel/qobject.cpp:3143
#18 0xa9484823 in TaskManager::TaskManager::taskRemoved (this=0x8f796f8, _t1={d = 0xbfe87624}) at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/taskmanager.moc:162
#19 0xa94860cf in TaskManager::TaskManager::windowRemoved (this=0x8f796f8, w=48236815) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/taskmanager.cpp:279
#20 0xa9487fec in TaskManager::TaskManager::qt_metacall (this=0x8f796f8, _c=QMetaObject::InvokeMetaMethod, _id=7, _a=0xbfe8774c)
    at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/taskmanager.moc:110
#21 0xb7e73ca8 in QMetaObject::activate (sender=0x8b1c4d0, from_signal_index=6, to_signal_index=6, argv=0xbfe8774c) at kernel/qobject.cpp:3069
#22 0xb7e74932 in QMetaObject::activate (sender=0x8b1c4d0, m=0xb75dc26c, local_signal_index=2, argv=0xbfe8774c) at kernel/qobject.cpp:3143
#23 0xb7574853 in KWindowSystem::windowRemoved (this=0x8b1c4d0, _t1=48236815) at /build/buildd/kde4libs-4.2.95/obj-i486-linux-gnu/kdeui/kwindowsystem.moc:127
#24 0xb75770d6 in KWindowSystemPrivate::removeClient (this=0x89bdf10, w=48236815) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:249
#25 0xb7586753 in NETRootInfo::update (this=0x89bdf24, dirty_props=0xbfe87894) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2135
#26 0xb7586b3f in NETRootInfo::event (this=0x89bdf24, event=0xbfe87fac, properties=0xbfe87978, properties_size=5) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2058
#27 0xb757736d in KWindowSystemPrivate::x11Event (this=0x89bdf10, ev=0xbfe87f4c) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#28 0xb74276f9 in KApplication::x11EventFilter (this=0x88a88f0, _event=0xbfe87f4c) at /build/buildd/kde4libs-4.2.95/kdeui/kernel/kapplication.cpp:911
#29 0xb4aafe37 in PlasmaApp::x11EventFilter (this=0x88a88f0, event=0xbfe87f4c) at /build/buildd/kdebase-workspace-4.2.95/plasma/shells/desktop/plasmaapp.cpp:490
#30 0xb6950f3e in qt_x11EventFilter (ev=0xbfe87f4c) at kernel/qapplication_x11.cpp:375
#31 0xb69636a8 in QApplication::x11ProcessEvent (this=0x88a88f0, event=0xbfe87f4c) at kernel/qapplication_x11.cpp:3273
#32 0xb698fc6a in x11EventSourceDispatch (s=0x88cec70, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#33 0xb6480b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#34 0xb64840eb in ?? () from /usr/lib/libglib-2.0.so.0
#35 0xb6484268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#36 0xb7e89438 in QEventDispatcherGlib::processEvents (this=0x88c96f8, flags={i = -1075281656}) at kernel/qeventdispatcher_glib.cpp:323
#37 0xb698f365 in QGuiEventDispatcherGlib::processEvents (this=0x88c96f8, flags={i = -1075281608}) at kernel/qguieventdispatcher_glib.cpp:202
#38 0xb7e5c06a in QEventLoop::processEvents (this=0xbfe881b0, flags={i = -1075281544}) at kernel/qeventloop.cpp:149
#39 0xb7e5c4aa in QEventLoop::exec (this=0xbfe881b0, flags={i = -1075281480}) at kernel/qeventloop.cpp:200
#40 0xb7e5e959 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#41 0xb68edd17 in QApplication::exec () at kernel/qapplication.cpp:3553
#42 0xb4a9a510 in kdemain (argc=1, argv=0x8893bd0) at /build/buildd/kdebase-workspace-4.2.95/plasma/shells/desktop/main.cpp:50
#43 0x0804e1c0 in launch (argc=1, _name=0x88b31bc "/usr/bin/plasma-desktop", args=0x88b31d4 "", cwd=0x0, envc=0, envs=0x88b31d8 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80512d1 "0") at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:672
#44 0x0804e99d in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1164
#45 0x0804ef25 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1357
#46 0x0804fb0a in main (argc=2, argv=0xbfe889a4, envp=0xbfe889b0) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1784

Reported using DrKonqi