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 was using the taskmanager

 -- Backtrace:
Application: Plasma Workspace (kdeinit), signal: Segmentation fault
[Current thread is 0 (LWP 3384)]

Thread 2 (Thread 0x7fae9e6ac950 (LWP 3387)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007faebd1fc939 in QWaitCondition::wait (this=0x2118fa0, mutex=0x2118f98, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007faebc0794cc in QHostInfoAgent::run (this=0x2118f80) at kernel/qhostinfo.cpp:260
#3  0x00007faebd1fb952 in QThreadPrivate::start (arg=0x2118f80) at thread/qthread_unix.cpp:189
#4  0x00007faeb907d3ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007faeb9c61fcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7faebd7c7750 (LWP 3384)):
[KCrash Handler]
#5  0x00007faea111784c in TaskManager::AbstractGroupingStrategy::closeGroup (this=0x24aa820, group=0x251d810)
    at /build/buildd/kdebase-workspace-4.2.90/libs/taskmanager/abstractgroupingstrategy.cpp:140
#6  0x00007faea111e908 in TaskManager::ProgramGroupingStrategy::checkGroup (this=0x24aa820) at /build/buildd/kdebase-workspace-4.2.90/libs/taskmanager/strategies/programgroupingstrategy.cpp:193
#7  0x00007faea111f4ed in TaskManager::ProgramGroupingStrategy::qt_metacall (this=0x24aa820, _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  0x00007faebd2fa1f2 in QMetaObject::activate (sender=0x251d810, from_signal_index=<value optimized out>, to_signal_index=22, argv=0x1) at kernel/qobject.cpp:3069
#9  0x00007faea1130572 in TaskManager::TaskGroup::itemRemoved (this=0x1755158, _t1=0x2515940) at /build/buildd/kdebase-workspace-4.2.90/obj-x86_64-linux-gnu/libs/taskmanager/taskgroup.moc:143
#10 0x00007faea1119fe2 in TaskManager::GroupManagerPrivate::removeTask (this=0x1be13d0, task={d = 0x7fffc57f9fd0}) at /build/buildd/kdebase-workspace-4.2.90/libs/taskmanager/groupmanager.cpp:296
#11 0x00007faea111bf7d in TaskManager::GroupManager::qt_metacall (this=0x1be1070, _c=<value optimized out>, _id=<value optimized out>, _a=0x7fffc57fa110)
    at /build/buildd/kdebase-workspace-4.2.90/obj-x86_64-linux-gnu/libs/taskmanager/groupmanager.moc:103
#12 0x00007faebd2fa1f2 in QMetaObject::activate (sender=0x1be11a0, from_signal_index=<value optimized out>, to_signal_index=5, argv=0x1) at kernel/qobject.cpp:3069
#13 0x00007faea11337e5 in TaskManager::TaskManager::taskRemoved (this=0x1755158, _t1=<value optimized out>)
    at /build/buildd/kdebase-workspace-4.2.90/obj-x86_64-linux-gnu/libs/taskmanager/taskmanager.moc:159
#14 0x00007faea1134cee in TaskManager::TaskManager::windowRemoved (this=0x1be11a0, w=29362460) at /build/buildd/kdebase-workspace-4.2.90/libs/taskmanager/taskmanager.cpp:279
#15 0x00007faea1136bef in TaskManager::TaskManager::qt_metacall (this=0x1be11a0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffc57fa330)
    at /build/buildd/kdebase-workspace-4.2.90/obj-x86_64-linux-gnu/libs/taskmanager/taskmanager.moc:108
#16 0x00007faebd2fa1f2 in QMetaObject::activate (sender=0x1a5aea0, from_signal_index=<value optimized out>, to_signal_index=6, argv=0x1) at kernel/qobject.cpp:3069
#17 0x00007faebbade462 in KWindowSystem::windowRemoved (this=0x1755158, _t1=29362460) at /build/buildd/kde4libs-4.2.90/obj-x86_64-linux-gnu/kdeui/kwindowsystem.moc:127
#18 0x00007faebbae09ab in KWindowSystemPrivate::removeClient (this=0x1a5b130, w=29362460) at /build/buildd/kde4libs-4.2.90/kdeui/windowmanagement/kwindowsystem_x11.cpp:249
#19 0x00007faebbaef9e0 in NETRootInfo::update (this=0x1a5b158, dirty_props=<value optimized out>) at /build/buildd/kde4libs-4.2.90/kdeui/windowmanagement/netwm.cpp:2126
#20 0x00007faebbaefd1b in NETRootInfo::event (this=0x1a5b158, event=<value optimized out>, properties=0x7fffc57fa620, properties_size=5)
    at /build/buildd/kde4libs-4.2.90/kdeui/windowmanagement/netwm.cpp:2053
#21 0x00007faebbae0c7b in KWindowSystemPrivate::x11Event (this=0x1a5b130, ev=0x7fffc57fb010) at /build/buildd/kde4libs-4.2.90/kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#22 0x00007faebb9b0483 in KApplication::x11EventFilter (this=<value optimized out>, _event=0x7fffc57fb010) at /build/buildd/kde4libs-4.2.90/kdeui/kernel/kapplication.cpp:911
#23 0x00007faeb25c8817 in PlasmaApp::x11EventFilter (this=0x17a75c0, event=0x7fffc57fb010) at /build/buildd/kdebase-workspace-4.2.90/plasma/shells/desktop/plasmaapp.cpp:444
#24 0x00007faeba8cab1f in qt_x11EventFilter (ev=0x7fffc57fb010) at kernel/qapplication_x11.cpp:375
#25 0x00007faeba8ddfaf in QApplication::x11ProcessEvent (this=0x17a75c0, event=0x7fffc57fb010) at kernel/qapplication_x11.cpp:3273
#26 0x00007faeba907464 in x11EventSourceDispatch (s=0x17ea160, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#27 0x00007faeb92cc20a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#28 0x00007faeb92cf8e0 in ?? () from /usr/lib/libglib-2.0.so.0
#29 0x00007faeb92cfa7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#30 0x00007faebd30de6f in QEventDispatcherGlib::processEvents (this=0x17e6630, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:323
#31 0x00007faeba906bef in QGuiEventDispatcherGlib::processEvents (this=0x1755158, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#32 0x00007faebd2e3002 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -981486848}) at kernel/qeventloop.cpp:149
#33 0x00007faebd2e33cd in QEventLoop::exec (this=0x7fffc57fb340, flags={i = -981486768}) at kernel/qeventloop.cpp:200
#34 0x00007faebd2e5694 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#35 0x00007faeb25b57eb in kdemain (argc=1, argv=0x1753aa0) at /build/buildd/kdebase-workspace-4.2.90/plasma/shells/desktop/main.cpp:50
#36 0x000000000040714e in launch (argc=1, _name=0x179c5a8 "/usr/bin/plasma-desktop", args=<value optimized out>, cwd=0x0, envc=0, envs=0x179c5c8 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x40a308 "0") at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:671
#37 0x0000000000407978 in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:1163
#38 0x0000000000407f25 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:1356
#39 0x0000000000408a66 in main (argc=2, argv=0x7fffc57fc1d8, envp=0x7fffc57fc1f0) at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:1783

Reported using DrKonqi