Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.90 (KDE 4.2.90 (KDE 4.3 Beta2))
Qt Version: 4.5.0
Operating System: Linux 2.6.28-11-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
I have activate the desktop effects kwin, i was using firefox3 kmess2 and kontact. i use the effect for see all windows in left up corner and plasma crashed

 -- Backtrace:
Application: Plasma Workspace (kdeinit), signal: Segmentation fault
[Current thread is 0 (LWP 3377)]

Thread 2 (Thread 0x7f8b44a05950 (LWP 3379)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f8b63555939 in QWaitCondition::wait (this=0x24f0540, mutex=0x24f0538, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007f8b623d24cc in QHostInfoAgent::run (this=0x24f0520) at kernel/qhostinfo.cpp:260
#3  0x00007f8b63554952 in QThreadPrivate::start (arg=0x24f0520) at thread/qthread_unix.cpp:189
#4  0x00007f8b5f3d63ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f8b5ffbafcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f8b63b20750 (LWP 3377)):
[KCrash Handler]
#5  0x00007f8b4747084c in TaskManager::AbstractGroupingStrategy::closeGroup (this=0x2f2ded0, group=0x2f7d8d0)
    at /build/buildd/kdebase-workspace-4.2.90/libs/taskmanager/abstractgroupingstrategy.cpp:140
#6  0x00007f8b47477908 in TaskManager::ProgramGroupingStrategy::checkGroup (this=0x2f2ded0) at /build/buildd/kdebase-workspace-4.2.90/libs/taskmanager/strategies/programgroupingstrategy.cpp:193
#7  0x00007f8b474784ed in TaskManager::ProgramGroupingStrategy::qt_metacall (this=0x2f2ded0, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=<value optimized out>)
    at /build/buildd/kdebase-workspace-4.2.90/obj-x86_64-linux-gnu/libs/taskmanager/programgroupingstrategy.moc:68
#8  0x00007f8b636531f2 in QMetaObject::activate (sender=0x2f7d8d0, from_signal_index=<value optimized out>, to_signal_index=22, argv=0x1) at kernel/qobject.cpp:3069
#9  0x00007f8b47489572 in TaskManager::TaskGroup::itemRemoved (this=0x1aaf158, _t1=0x2f09400) at /build/buildd/kdebase-workspace-4.2.90/obj-x86_64-linux-gnu/libs/taskmanager/taskgroup.moc:143
#10 0x00007f8b47472fe2 in TaskManager::GroupManagerPrivate::removeTask (this=0x1fa0070, task={d = 0x7fff6bb535c0}) at /build/buildd/kdebase-workspace-4.2.90/libs/taskmanager/groupmanager.cpp:296
#11 0x00007f8b47473abe in TaskManager::GroupManagerPrivate::reloadTasks (this=0x1fa0070) at /build/buildd/kdebase-workspace-4.2.90/libs/taskmanager/groupmanager.cpp:151
#12 0x00007f8b474750b0 in TaskManager::GroupManager::qt_metacall (this=0x2023320, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff6bb537a0)
    at /build/buildd/kdebase-workspace-4.2.90/obj-x86_64-linux-gnu/libs/taskmanager/groupmanager.moc:95
#13 0x00007f8b636531f2 in QMetaObject::activate (sender=0x2023450, from_signal_index=<value optimized out>, to_signal_index=8, argv=0x1) at kernel/qobject.cpp:3069
#14 0x00007f8b4748c741 in TaskManager::TaskManager::desktopChanged (this=0x1aaf158, _t1=1) at /build/buildd/kdebase-workspace-4.2.90/obj-x86_64-linux-gnu/libs/taskmanager/taskmanager.moc:180
#15 0x00007f8b4748fb9e in TaskManager::TaskManager::qt_metacall (this=0x2023450, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff6bb53950)
    at /build/buildd/kdebase-workspace-4.2.90/obj-x86_64-linux-gnu/libs/taskmanager/taskmanager.moc:111
#16 0x00007f8b636531f2 in QMetaObject::activate (sender=0x1e1acc0, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x1) at kernel/qobject.cpp:3069
#17 0x00007f8b61e374de in KWindowSystem::currentDesktopChanged (this=0x1aaf158, _t1=1) at /build/buildd/kde4libs-4.2.90/obj-x86_64-linux-gnu/kdeui/kwindowsystem.moc:113
#18 0x00007f8b61e39e33 in KWindowSystemPrivate::x11Event (this=0x1e1af50, ev=0x7fff6bb54370) at /build/buildd/kde4libs-4.2.90/kdeui/windowmanagement/kwindowsystem_x11.cpp:139
#19 0x00007f8b61d09483 in KApplication::x11EventFilter (this=<value optimized out>, _event=0x7fff6bb54370) at /build/buildd/kde4libs-4.2.90/kdeui/kernel/kapplication.cpp:911
#20 0x00007f8b58921817 in PlasmaApp::x11EventFilter (this=0x1b01580, event=0x7fff6bb54370) at /build/buildd/kdebase-workspace-4.2.90/plasma/shells/desktop/plasmaapp.cpp:444
#21 0x00007f8b60c23b1f in qt_x11EventFilter (ev=0x7fff6bb54370) at kernel/qapplication_x11.cpp:375
#22 0x00007f8b60c36faf in QApplication::x11ProcessEvent (this=0x1b01580, event=0x7fff6bb54370) at kernel/qapplication_x11.cpp:3273
#23 0x00007f8b60c60464 in x11EventSourceDispatch (s=0x1b44120, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#24 0x00007f8b5f62520a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#25 0x00007f8b5f6288e0 in ?? () from /usr/lib/libglib-2.0.so.0
#26 0x00007f8b5f628a7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#27 0x00007f8b63666e6f in QEventDispatcherGlib::processEvents (this=0x1b40600, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:323
#28 0x00007f8b60c5fbef in QGuiEventDispatcherGlib::processEvents (this=0x1aaf158, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#29 0x00007f8b6363c002 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 1807042144}) at kernel/qeventloop.cpp:149
#30 0x00007f8b6363c3cd in QEventLoop::exec (this=0x7fff6bb546a0, flags={i = 1807042224}) at kernel/qeventloop.cpp:200
#31 0x00007f8b6363e694 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#32 0x00007f8b5890e7eb in kdemain (argc=1, argv=0x1af6650) at /build/buildd/kdebase-workspace-4.2.90/plasma/shells/desktop/main.cpp:50
#33 0x000000000040714e in launch (argc=1, _name=0x1af42f8 "/usr/bin/plasma-desktop", args=<value optimized out>, cwd=0x0, envc=0, envs=0x1af4318 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x40a308 "0") at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:671
#34 0x0000000000407978 in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:1163
#35 0x0000000000407f25 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:1356
#36 0x0000000000408a66 in main (argc=2, argv=0x7fff6bb55538, envp=0x7fff6bb55550) at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:1783

Reported using DrKonqi