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:
I encounter this bug a lot during my daily use: As soon as I use a more complex feature of a program (as in not just UI-related stuff but more on persistence / input processing side of things) plasma crashes.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[KCrash Handler]
#6  TaskManager::GroupManager::manualSortingRequest (this=0x0, taskItem=0x9d45688, newIndex=2) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:363
#7  0xa852e31b in TaskManager::AbstractGroupingStrategy::closeGroup (this=0x9c09c58, group=0xa846170) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/abstractgroupingstrategy.cpp:167
#8  0xa8535f27 in TaskManager::ProgramGroupingStrategy::checkGroup (this=0x9c09c58) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/strategies/programgroupingstrategy.cpp:204
#9  0xa8536e5b in TaskManager::ProgramGroupingStrategy::qt_metacall (this=0x9c09c58, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbfaa2d2c)
    at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/programgroupingstrategy.moc:68
#10 0xb7e8cca8 in QMetaObject::activate (sender=0xa846170, from_signal_index=22, to_signal_index=22, argv=0xbfaa2d2c) at kernel/qobject.cpp:3069
#11 0xb7e8d932 in QMetaObject::activate (sender=0xa846170, m=0xa8558b74, local_signal_index=1, argv=0xbfaa2d2c) at kernel/qobject.cpp:3143
#12 0xa8549d83 in TaskManager::TaskGroup::itemRemoved (this=0xa846170, _t1=0xa8ae2b8) at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/taskgroup.moc:146
#13 0xa854a7ab in TaskManager::TaskGroup::remove (this=0xa846170, item=0xa8ae2b8) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/taskgroup.cpp:182
#14 0xa8530ba5 in TaskManager::GroupManagerPrivate::removeTask (this=0x9a3be78, task={d = 0xbfaa2ddc}) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:311
#15 0xa853346a in TaskManager::GroupManager::qt_metacall (this=0x9a3ca18, _c=QMetaObject::InvokeMetaMethod, _id=11, _a=0xbfaa2ebc)
    at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/groupmanager.moc:105
#16 0xb7e8cca8 in QMetaObject::activate (sender=0x9a3be60, from_signal_index=5, to_signal_index=5, argv=0xbfaa2ebc) at kernel/qobject.cpp:3069
#17 0xb7e8d932 in QMetaObject::activate (sender=0x9a3be60, m=0xa8558d3c, local_signal_index=1, argv=0xbfaa2ebc) at kernel/qobject.cpp:3143
#18 0xa854d823 in TaskManager::TaskManager::taskRemoved (this=0x9a3be60, _t1={d = 0xbfaa2f04}) at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/taskmanager.moc:162
#19 0xa854f0cf in TaskManager::TaskManager::windowRemoved (this=0x9a3be60, w=63052828) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/taskmanager.cpp:279
#20 0xa8550fec in TaskManager::TaskManager::qt_metacall (this=0x9a3be60, _c=QMetaObject::InvokeMetaMethod, _id=7, _a=0xbfaa302c)
    at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/taskmanager.moc:110
#21 0xb7e8cca8 in QMetaObject::activate (sender=0x98bb5a0, from_signal_index=6, to_signal_index=6, argv=0xbfaa302c) at kernel/qobject.cpp:3069
#22 0xb7e8d932 in QMetaObject::activate (sender=0x98bb5a0, m=0xb75f526c, local_signal_index=2, argv=0xbfaa302c) at kernel/qobject.cpp:3143
#23 0xb758d853 in KWindowSystem::windowRemoved (this=0x98bb5a0, _t1=63052828) at /build/buildd/kde4libs-4.2.95/obj-i486-linux-gnu/kdeui/kwindowsystem.moc:127
#24 0xb75900d6 in KWindowSystemPrivate::removeClient (this=0x97251a0, w=63052828) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:249
#25 0xb759f7c2 in NETRootInfo::update (this=0x97251b4, dirty_props=0xbfaa3174) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2131
#26 0xb759fb3f in NETRootInfo::event (this=0x97251b4, event=0xbfaa388c, properties=0xbfaa3258, properties_size=5) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2058
#27 0xb759036d in KWindowSystemPrivate::x11Event (this=0x97251a0, ev=0xbfaa382c) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#28 0xb74406f9 in KApplication::x11EventFilter (this=0x9618830, _event=0xbfaa382c) at /build/buildd/kde4libs-4.2.95/kdeui/kernel/kapplication.cpp:911
#29 0xb3b6ae37 in PlasmaApp::x11EventFilter (this=0x9618830, event=0xbfaa382c) at /build/buildd/kdebase-workspace-4.2.95/plasma/shells/desktop/plasmaapp.cpp:490
#30 0xb6969f3e in qt_x11EventFilter (ev=0xbfaa382c) at kernel/qapplication_x11.cpp:375
#31 0xb697c6a8 in QApplication::x11ProcessEvent (this=0x9618830, event=0xbfaa382c) at kernel/qapplication_x11.cpp:3273
#32 0xb69a8c6a in x11EventSourceDispatch (s=0x962eb00, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#33 0xb6499b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#34 0xb649d0eb in ?? () from /usr/lib/libglib-2.0.so.0
#35 0xb649d268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#36 0xb7ea2438 in QEventDispatcherGlib::processEvents (this=0x962b560, flags={i = -1079363096}) at kernel/qeventdispatcher_glib.cpp:323
#37 0xb69a8365 in QGuiEventDispatcherGlib::processEvents (this=0x962b560, flags={i = -1079363048}) at kernel/qguieventdispatcher_glib.cpp:202
#38 0xb7e7506a in QEventLoop::processEvents (this=0xbfaa3a90, flags={i = -1079362984}) at kernel/qeventloop.cpp:149
#39 0xb7e754aa in QEventLoop::exec (this=0xbfaa3a90, flags={i = -1079362920}) at kernel/qeventloop.cpp:200
#40 0xb7e77959 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#41 0xb6906d17 in QApplication::exec () at kernel/qapplication.cpp:3553
#42 0xb3b55510 in kdemain (argc=1, argv=0x96281e0) at /build/buildd/kdebase-workspace-4.2.95/plasma/shells/desktop/main.cpp:50
#43 0x0804e1c0 in launch (argc=1, _name=0x95bfc18 "plasma-desktop", args=0x0, cwd=0x0, envc=0, envs=0x0, 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 0x0804fa3d in main (argc=2, argv=0xbfaa3f44, envp=0xbfaa3f50) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1755

This bug may be a duplicate of or related to bug 199466

Reported using DrKonqi