Version:            (using Devel)
OS:                Linux
Installed from:    Compiled sources

I update from KDE 4.3 beta 2 to KDE 4.3 RC on my kubuntu. Then I noticed plasma-desktop used unexpectabily 40-60% of CPU charge. As said on ubuntu forum I erase all plasma configuration files. I reboot my computer which restart normally. When KDE finished to load, I had this crash.

I had this message :

Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 4029)]

Thread 2 (Thread 0xa821eb90 (LWP 4034)):
#0  0xb7f28430 in __kernel_vsyscall ()
#1  0xb63ef0e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb65cf2ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7d229b2 in QWaitCondition::wait (this=0x9746fb0, mutex=0x9746fac, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb765e152 in QHostInfoAgent::run (this=0x9746fa0) at kernel/qhostinfo.cpp:260
#5  0xb7d2196e in QThreadPrivate::start (arg=0x9746fa0) at thread/qthread_unix.cpp:189
#6  0xb63eb4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb65c049e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb5ef9a10 (LWP 4029)):
[KCrash Handler]
#6  0xb6ed3a9a in QGraphicsItem::isWidget (this=0x9d32df8) at graphicsview/qgraphicsitem.cpp:1145
#7  0xb6f09b27 in QGraphicsScene::event (this=0x90c66e8, event=0xbfb45720) at graphicsview/qgraphicsscene.cpp:3703
#8  0xb68a5e9c in QApplicationPrivate::notify_helper (this=0x8ffb0a8, receiver=0x90c66e8, e=0xbfb45720) at kernel/qapplication.cpp:4084
#9  0xb68ae19e in QApplication::notify (this=0x8ff5288, receiver=0x90c66e8, e=0xbfb45720) at kernel/qapplication.cpp:3631
#10 0xb73e03dd in KApplication::notify (this=0x8ff5288, receiver=0x90c66e8, event=0xbfb45720) at /build/buildd/kde4libs-4.2.95/kdeui/kernel/kapplication.cpp:302
#11 0xb7e15a3b in QCoreApplication::notifyInternal (this=0x8ff5288, receiver=0x90c66e8, event=0xbfb45720) at kernel/qcoreapplication.cpp:602
#12 0xb6f1a1c5 in QGraphicsView::viewportEvent (this=0x9890198, event=0xbfb45720) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#13 0xb6d78f55 in QAbstractScrollAreaFilter::eventFilter (this=0x98c4950, o=0x988eda0, e=0xbfb45720) at widgets/qabstractscrollarea_p.h:100
#14 0xb7e14c5a in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x8ffb0a8, receiver=0x988eda0, event=0xbfb45720) at kernel/qcoreapplication.cpp:718
#15 0xb68a5e7a in QApplicationPrivate::notify_helper (this=0x8ffb0a8, receiver=0x988eda0, e=0xbfb45720) at kernel/qapplication.cpp:4080
#16 0xb68ae282 in QApplication::notify (this=0x8ff5288, receiver=0x988eda0, e=0xbfb45720) at kernel/qapplication.cpp:4049
#17 0xb73e03dd in KApplication::notify (this=0x8ff5288, receiver=0x988eda0, event=0xbfb45720) at /build/buildd/kde4libs-4.2.95/kdeui/kernel/kapplication.cpp:302
#18 0xb7e15a3b in QCoreApplication::notifyInternal (this=0x8ff5288, receiver=0x988eda0, event=0xbfb45720) at kernel/qcoreapplication.cpp:602
#19 0xb68fc61d in QWidget::event (this=0x9890198, event=0xbfb45720) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#20 0xb6cd6993 in QFrame::event (this=0x9890198, e=0xbfb45720) at widgets/qframe.cpp:559
#21 0xb6d7744d in QAbstractScrollArea::event (this=0x9890198, e=0xbfb45720) at widgets/qabstractscrollarea.cpp:918
#22 0xb6f19ff6 in QGraphicsView::event (this=0x9890198, event=0xbfb45720) at graphicsview/qgraphicsview.cpp:2854
#23 0xb68a5e9c in QApplicationPrivate::notify_helper (this=0x8ffb0a8, receiver=0x9890198, e=0xbfb45720) at kernel/qapplication.cpp:4084
#24 0xb68ae282 in QApplication::notify (this=0x8ff5288, receiver=0x9890198, e=0xbfb45720) at kernel/qapplication.cpp:4049
#25 0xb73e03dd in KApplication::notify (this=0x8ff5288, receiver=0x9890198, event=0xbfb45720) at /build/buildd/kde4libs-4.2.95/kdeui/kernel/kapplication.cpp:302
#26 0xb7e15a3b in QCoreApplication::notifyInternal (this=0x8ff5288, receiver=0x9890198, event=0xbfb45720) at kernel/qcoreapplication.cpp:602
#27 0xb68acd9e in QApplication::setActiveWindow (act=0x9890198) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#28 0xb691c56c in QApplication::x11ProcessEvent (this=0x8ff5288, event=0xbfb45c1c) at kernel/qapplication_x11.cpp:3462
#29 0xb6947c6a in x11EventSourceDispatch (s=0x8ffde70, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#30 0xb6438b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0xb643c0eb in ?? () from /usr/lib/libglib-2.0.so.0
#32 0xb643c268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#33 0xb7e41438 in QEventDispatcherGlib::processEvents (this=0x8ffa588, flags={i = -1078698536}) at kernel/qeventdispatcher_glib.cpp:323
#34 0xb6947365 in QGuiEventDispatcherGlib::processEvents (this=0x8ffa588, flags={i = -1078698488}) at kernel/qguieventdispatcher_glib.cpp:202
#35 0xb7e1406a in QEventLoop::processEvents (this=0xbfb45e80, flags={i = -1078698424}) at kernel/qeventloop.cpp:149
#36 0xb7e144aa in QEventLoop::exec (this=0xbfb45e80, flags={i = -1078698360}) at kernel/qeventloop.cpp:200
#37 0xb7e16959 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#38 0xb68a5d17 in QApplication::exec () at kernel/qapplication.cpp:3553
#39 0xb3af1510 in kdemain (argc=1, argv=0x8fca410) at /build/buildd/kdebase-workspace-4.2.95/plasma/shells/desktop/main.cpp:50
#40 0x0804e1c0 in launch (argc=1, _name=0x8fcc6d4 "/usr/bin/plasma-desktop", args=0x8fcc6ec "", cwd=0x0, envc=0, envs=0x8fcc6f0 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80512d1 "0") at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:672
#41 0x0804e99d in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1164
#42 0x0804ef25 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1357
#43 0x0804fb0a in main (argc=2, argv=0xbfb46674, envp=0xbfb46680) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1784