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:
Plasma crashes randomly, with any application, without doing anything in special. It doesn't crash very often. It started to happen when I upgrade to KDE 4.3 RC

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 4291)]

Thread 3 (Thread 0xa830db90 (LWP 4292)):
#0  0xb7ff1430 in __kernel_vsyscall ()
#1  0xb66827b1 in select () from /lib/tls/i686/cmov/libc.so.6
#2  0xb7ebd380 in QProcessManager::run (this=0x8439770) at io/qprocess_unix.cpp:305
#3  0xb7deb96e in QThreadPrivate::start (arg=0x8439770) at thread/qthread_unix.cpp:189
#4  0xb64b54ff in start_thread (arg=0xa830db90) at pthread_create.c:297
#5  0xb668a49e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 2 (Thread 0xa79e6b90 (LWP 4294)):
#0  0xb7ff1430 in __kernel_vsyscall ()
#1  0xb64b90e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb66992ed in __pthread_cond_wait (cond=0x8cc4d60, mutex=0x8cc4d48) at forward.c:139
#3  0xb7dec9b2 in QWaitCondition::wait (this=0x8d16780, mutex=0x8d1677c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb7728152 in QHostInfoAgent::run (this=0x8d16770) at kernel/qhostinfo.cpp:260
#5  0xb7deb96e in QThreadPrivate::start (arg=0x8d16770) at thread/qthread_unix.cpp:189
#6  0xb64b54ff in start_thread (arg=0xa79e6b90) at pthread_create.c:297
#7  0xb668a49e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb5fc3a10 (LWP 4291)):
[KCrash Handler]
#6  TaskManager::GroupManager::manualSortingRequest (this=0x0, taskItem=0x9160410, newIndex=1) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:363
#7  0xa84cf31b in TaskManager::AbstractGroupingStrategy::closeGroup (this=0x8b907b0, group=0x91b3778) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/abstractgroupingstrategy.cpp:167
#8  0xa84d6f27 in TaskManager::ProgramGroupingStrategy::checkGroup (this=0x8b907b0) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/strategies/programgroupingstrategy.cpp:204
#9  0xa84d7e5b in TaskManager::ProgramGroupingStrategy::qt_metacall (this=0x8b907b0, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbfe0e2fc)
    at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/programgroupingstrategy.moc:68
#10 0xb7ef5ca8 in QMetaObject::activate (sender=0x91b3778, from_signal_index=22, to_signal_index=22, argv=0xbfe0e2fc) at kernel/qobject.cpp:3069
#11 0xb7ef6932 in QMetaObject::activate (sender=0x91b3778, m=0xa84f9b74, local_signal_index=1, argv=0xbfe0e2fc) at kernel/qobject.cpp:3143
#12 0xa84ead83 in TaskManager::TaskGroup::itemRemoved (this=0x91b3778, _t1=0x89b8190) at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/taskgroup.moc:146
#13 0xa84eb7ab in TaskManager::TaskGroup::remove (this=0x91b3778, item=0x89b8190) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/taskgroup.cpp:182
#14 0xa84d1ba5 in TaskManager::GroupManagerPrivate::removeTask (this=0x88d78a0, task={d = 0xbfe0e3ac}) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:311
#15 0xa84d446a in TaskManager::GroupManager::qt_metacall (this=0x87f4000, _c=QMetaObject::InvokeMetaMethod, _id=11, _a=0xbfe0e48c)
    at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/groupmanager.moc:105
#16 0xb7ef5ca8 in QMetaObject::activate (sender=0x88db9b8, from_signal_index=5, to_signal_index=5, argv=0xbfe0e48c) at kernel/qobject.cpp:3069
#17 0xb7ef6932 in QMetaObject::activate (sender=0x88db9b8, m=0xa84f9d3c, local_signal_index=1, argv=0xbfe0e48c) at kernel/qobject.cpp:3143
#18 0xa84ee823 in TaskManager::TaskManager::taskRemoved (this=0x88db9b8, _t1={d = 0xbfe0e4d4}) at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/taskmanager.moc:162
#19 0xa84f00cf in TaskManager::TaskManager::windowRemoved (this=0x88db9b8, w=50338148) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/taskmanager.cpp:279
#20 0xa84f1fec in TaskManager::TaskManager::qt_metacall (this=0x88db9b8, _c=QMetaObject::InvokeMetaMethod, _id=7, _a=0xbfe0e5fc)
    at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/taskmanager.moc:110
#21 0xb7ef5ca8 in QMetaObject::activate (sender=0x86df4f0, from_signal_index=6, to_signal_index=6, argv=0xbfe0e5fc) at kernel/qobject.cpp:3069
#22 0xb7ef6932 in QMetaObject::activate (sender=0x86df4f0, m=0xb765e26c, local_signal_index=2, argv=0xbfe0e5fc) at kernel/qobject.cpp:3143
#23 0xb75f6853 in KWindowSystem::windowRemoved (this=0x86df4f0, _t1=50338148) at /build/buildd/kde4libs-4.2.95/obj-i486-linux-gnu/kdeui/kwindowsystem.moc:127
#24 0xb75f90d6 in KWindowSystemPrivate::removeClient (this=0x850c7a8, w=50338148) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:249
#25 0xb7608753 in NETRootInfo::update (this=0x850c7bc, dirty_props=0xbfe0e744) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2135
#26 0xb7608b3f in NETRootInfo::event (this=0x850c7bc, event=0xbfe0ee5c, properties=0xbfe0e828, properties_size=5) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2058
#27 0xb75f936d in KWindowSystemPrivate::x11Event (this=0x850c7a8, ev=0xbfe0edfc) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#28 0xb74a96f9 in KApplication::x11EventFilter (this=0x84303d8, _event=0xbfe0edfc) at /build/buildd/kde4libs-4.2.95/kdeui/kernel/kapplication.cpp:911
#29 0xb3bd1e37 in PlasmaApp::x11EventFilter (this=0x84303d8, event=0xbfe0edfc) at /build/buildd/kdebase-workspace-4.2.95/plasma/shells/desktop/plasmaapp.cpp:490
#30 0xb69d2f3e in qt_x11EventFilter (ev=0xbfe0edfc) at kernel/qapplication_x11.cpp:375
#31 0xb69e56a8 in QApplication::x11ProcessEvent (this=0x84303d8, event=0xbfe0edfc) at kernel/qapplication_x11.cpp:3273
#32 0xb6a11c6a in x11EventSourceDispatch (s=0x84390b0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#33 0xb6502b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#34 0xb65060eb in ?? () from /usr/lib/libglib-2.0.so.0
#35 0xb6506268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#36 0xb7f0b438 in QEventDispatcherGlib::processEvents (this=0x8433c10, flags={i = -1075777608}) at kernel/qeventdispatcher_glib.cpp:323
#37 0xb6a11365 in QGuiEventDispatcherGlib::processEvents (this=0x8433c10, flags={i = -1075777560}) at kernel/qguieventdispatcher_glib.cpp:202
#38 0xb7ede06a in QEventLoop::processEvents (this=0xbfe0f060, flags={i = -1075777496}) at kernel/qeventloop.cpp:149
#39 0xb7ede4aa in QEventLoop::exec (this=0xbfe0f060, flags={i = -1075777432}) at kernel/qeventloop.cpp:200
#40 0xb7ee0959 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#41 0xb696fd17 in QApplication::exec () at kernel/qapplication.cpp:3553
#42 0xb3bbc510 in kdemain (argc=1, argv=0x83b4b40) at /build/buildd/kdebase-workspace-4.2.95/plasma/shells/desktop/main.cpp:50
#43 0x0804e1c0 in launch (argc=1, _name=0x841b17c "/usr/bin/plasma-desktop", args=0x841b194 "", cwd=0x0, envc=0, envs=0x841b198 "", 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=0xbfe0f854, envp=0xbfe0f860) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1784

This bug may be a duplicate of or related to bug 198760

Reported using DrKonqi