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 2.6.30-020630rc2-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
I'm on Ubuntu 9.04 with KDE4.3 RC1
Plasma crash whe I load softawre even the soft that I load. 
This happen more often with the RC1 than with the Beta2

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 3517)]

Thread 2 (Thread 0xa8d26b90 (LWP 3524)):
#0  0xb806b430 in __kernel_vsyscall ()
#1  0xb65320e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb67122ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7e659b2 in QWaitCondition::wait (this=0xa490330, mutex=0xa49032c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb77a1152 in QHostInfoAgent::run (this=0xa490320) at kernel/qhostinfo.cpp:260
#5  0xb7e6496e in QThreadPrivate::start (arg=0xa490320) at thread/qthread_unix.cpp:189
#6  0xb652e4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb670349e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb603ca10 (LWP 3517)):
[KCrash Handler]
#6  TaskManager::GroupManager::manualSortingRequest (this=0x0, taskItem=0xab80c58, newIndex=0) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:363
#7  0xa94f231b in TaskManager::AbstractGroupingStrategy::closeGroup (this=0xa559c08, group=0xabf2808) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/abstractgroupingstrategy.cpp:167
#8  0xa94f9f27 in TaskManager::ProgramGroupingStrategy::checkGroup (this=0xa559c08) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/strategies/programgroupingstrategy.cpp:204
#9  0xa94fae5b in TaskManager::ProgramGroupingStrategy::qt_metacall (this=0xa559c08, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbfa8576c)
    at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/programgroupingstrategy.moc:68
#10 0xb7f6eca8 in QMetaObject::activate (sender=0xabf2808, from_signal_index=22, to_signal_index=22, argv=0xbfa8576c) at kernel/qobject.cpp:3069
#11 0xb7f6f932 in QMetaObject::activate (sender=0xabf2808, m=0xa951cb74, local_signal_index=1, argv=0xbfa8576c) at kernel/qobject.cpp:3143
#12 0xa950dd83 in TaskManager::TaskGroup::itemRemoved (this=0xabf2808, _t1=0xa451098) at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/taskgroup.moc:146
#13 0xa950e7ab in TaskManager::TaskGroup::remove (this=0xabf2808, item=0xa451098) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/taskgroup.cpp:182
#14 0xa94f4ba5 in TaskManager::GroupManagerPrivate::removeTask (this=0xa1d2b18, task={d = 0xbfa8581c}) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:311
#15 0xa94f746a in TaskManager::GroupManager::qt_metacall (this=0xa1e2490, _c=QMetaObject::InvokeMetaMethod, _id=11, _a=0xbfa858fc)
    at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/groupmanager.moc:105
#16 0xb7f6eca8 in QMetaObject::activate (sender=0xa1d20a8, from_signal_index=5, to_signal_index=5, argv=0xbfa858fc) at kernel/qobject.cpp:3069
#17 0xb7f6f932 in QMetaObject::activate (sender=0xa1d20a8, m=0xa951cd3c, local_signal_index=1, argv=0xbfa858fc) at kernel/qobject.cpp:3143
#18 0xa9511823 in TaskManager::TaskManager::taskRemoved (this=0xa1d20a8, _t1={d = 0xbfa85944}) at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/taskmanager.moc:162
#19 0xa95130cf in TaskManager::TaskManager::windowRemoved (this=0xa1d20a8, w=37766639) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/taskmanager.cpp:279
#20 0xa9514fec in TaskManager::TaskManager::qt_metacall (this=0xa1d20a8, _c=QMetaObject::InvokeMetaMethod, _id=7, _a=0xbfa85a6c)
    at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/taskmanager.moc:110
#21 0xb7f6eca8 in QMetaObject::activate (sender=0xa08d010, from_signal_index=6, to_signal_index=6, argv=0xbfa85a6c) at kernel/qobject.cpp:3069
#22 0xb7f6f932 in QMetaObject::activate (sender=0xa08d010, m=0xb76d726c, local_signal_index=2, argv=0xbfa85a6c) at kernel/qobject.cpp:3143
#23 0xb766f853 in KWindowSystem::windowRemoved (this=0xa08d010, _t1=37766639) at /build/buildd/kde4libs-4.2.95/obj-i486-linux-gnu/kdeui/kwindowsystem.moc:127
#24 0xb76720d6 in KWindowSystemPrivate::removeClient (this=0x9eb1058, w=37766639) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:249
#25 0xb7681753 in NETRootInfo::update (this=0x9eb106c, dirty_props=0xbfa85bb4) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2135
#26 0xb7681b3f in NETRootInfo::event (this=0x9eb106c, event=0xbfa862cc, properties=0xbfa85c98, properties_size=5) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2058
#27 0xb767236d in KWindowSystemPrivate::x11Event (this=0x9eb1058, ev=0xbfa8626c) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#28 0xb75226f9 in KApplication::x11EventFilter (this=0x9dc4fe8, _event=0xbfa8626c) at /build/buildd/kde4libs-4.2.95/kdeui/kernel/kapplication.cpp:911
#29 0xb4a9ae37 in PlasmaApp::x11EventFilter (this=0x9dc4fe8, event=0xbfa8626c) at /build/buildd/kdebase-workspace-4.2.95/plasma/shells/desktop/plasmaapp.cpp:490
#30 0xb6a4bf3e in qt_x11EventFilter (ev=0xbfa8626c) at kernel/qapplication_x11.cpp:375
#31 0xb6a5e6a8 in QApplication::x11ProcessEvent (this=0x9dc4fe8, event=0xbfa8626c) at kernel/qapplication_x11.cpp:3273
#32 0xb6a8ac6a in x11EventSourceDispatch (s=0x9dcdd70, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#33 0xb657bb88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#34 0xb657f0eb in ?? () from /usr/lib/libglib-2.0.so.0
#35 0xb657f268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#36 0xb7f84438 in QEventDispatcherGlib::processEvents (this=0x9dc87e8, flags={i = -1079483352}) at kernel/qeventdispatcher_glib.cpp:323
#37 0xb6a8a365 in QGuiEventDispatcherGlib::processEvents (this=0x9dc87e8, flags={i = -1079483304}) at kernel/qguieventdispatcher_glib.cpp:202
#38 0xb7f5706a in QEventLoop::processEvents (this=0xbfa864d0, flags={i = -1079483240}) at kernel/qeventloop.cpp:149
#39 0xb7f574aa in QEventLoop::exec (this=0xbfa864d0, flags={i = -1079483176}) at kernel/qeventloop.cpp:200
#40 0xb7f59959 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#41 0xb69e8d17 in QApplication::exec () at kernel/qapplication.cpp:3553
#42 0xb4a85510 in kdemain (argc=1, argv=0x9d61b40) at /build/buildd/kdebase-workspace-4.2.95/plasma/shells/desktop/main.cpp:50
#43 0x0804e1c0 in launch (argc=1, _name=0x9d9039c "/usr/bin/plasma-desktop", args=0x9d903b4 "", cwd=0x0, envc=0, envs=0x9d903b8 "", 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=0xbfa86cc4, envp=0xbfa86cd0) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1784

This bug may be a duplicate of or related to bug 198988

Reported using DrKonqi