Version:            (using KDE 4.4.1)
Installed from:    Gentoo Packages

Hello, after I have activate the desktop effect I have a crash:
Application: Plasma Workspace (kdeinit4), signal: Bus error
Traceback (most recent call last):
  File "/usr/share/gdb/auto-load/usr/lib64/libgobject-2.0.so.0.2200.4-gdb.py", line 9, in <module>
    from gobject import register
  File "/usr/share/glib-2.0/gdb/gobject.py", line 3, in <module>
    import gdb.backtrace
ImportError: No module named backtrace
The current source language is "auto; currently c".
[KCrash Handler]
#5  0x00007f411a2536dd in KPixmapCache::Private::mmapFile (this=0x18cdf00, filename=..., info=0x18cdf50, newsize=33656832)
    at /var/tmp/portage/kde-base/kdelibs-4.4.1-r1/work/kdelibs-4.4.1/kdeui/util/kpixmapcache.cpp:491
#6  0x00007f411a254b5e in KPixmapCache::Private::mmapFiles (this=0x18cdf00) at /var/tmp/portage/kde-base/kdelibs-4.4.1-r1/work/kdelibs-4.4.1/kdeui/util/kpixmapcache.cpp:419
#7  0x00007f411a2548f4 in KPixmapCache::Private::init (this=0x18cdf00) at /var/tmp/portage/kde-base/kdelibs-4.4.1-r1/work/kdelibs-4.4.1/kdeui/util/kpixmapcache.cpp:1061
#8  0x00007f411a255d6a in KPixmapCache::discard (this=0x18e9060) at /var/tmp/portage/kde-base/kdelibs-4.4.1-r1/work/kdelibs-4.4.1/kdeui/util/kpixmapcache.cpp:1279
#9  0x00007f411a256418 in KPixmapCache::deleteCache (name=...) at /var/tmp/portage/kde-base/kdelibs-4.4.1-r1/work/kdelibs-4.4.1/kdeui/util/kpixmapcache.cpp:1255
#10 0x00007f4112cc3970 in Plasma::ThemePrivate::discardCache (this=0x18cc830) at /var/tmp/portage/kde-base/kdelibs-4.4.1-r1/work/kdelibs-4.4.1/plasma/theme.cpp:221
#11 0x00007f4112cc3bfe in Plasma::ThemePrivate::compositingChanged (this=0x18cc830) at /var/tmp/portage/kde-base/kdelibs-4.4.1-r1/work/kdelibs-4.4.1/plasma/theme.cpp:213
#12 0x00007f4112cc53a9 in Plasma::Theme::qt_metacall (this=0x189f3c0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffb5768b40)
    at /var/tmp/portage/kde-base/kdelibs-4.4.1-r1/work/kdelibs-4.4.1_build/plasma/theme.moc:108
#13 0x00007f41199e411f in QMetaObject::activate (sender=0x18cc620, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x7f4119627cd7) at kernel/qobject.cpp:3285
#14 0x00007f411a24a6af in KSelectionWatcher::newOwner (this=0x2588360, _t1=20980837) at /var/tmp/portage/kde-base/kdelibs-4.4.1-r1/work/kdelibs-4.4.1_build/kdeui/kmanagerselection.moc:152
#15 0x00007f411a24a9ea in KSelectionWatcher::owner (this=0x18cc620) at /var/tmp/portage/kde-base/kdelibs-4.4.1-r1/work/kdelibs-4.4.1/kdeui/util/kmanagerselection.cpp:451
#16 0x00007f411a24bc4d in KSelectionWatcher::Private::x11Event (this=<value optimized out>, ev_P=0x0)
    at /var/tmp/portage/kde-base/kdelibs-4.4.1-r1/work/kdelibs-4.4.1/kdeui/util/kmanagerselection.cpp:395
#17 0x00007f411a1bf1a5 in KApplication::x11EventFilter (this=<value optimized out>, _event=0x7fffb5769380)
    at /var/tmp/portage/kde-base/kdelibs-4.4.1-r1/work/kdelibs-4.4.1/kdeui/kernel/kapplication.cpp:953
#18 0x00007f410ddfe054 in PlasmaApp::x11EventFilter (this=0x180e860, event=0x7fffb5769380)
    at /var/tmp/portage/kde-base/plasma-workspace-4.4.1/work/plasma-workspace-4.4.1/plasma/desktop/shell/plasmaapp.cpp:600
#19 0x00007f411883a1bf in qt_x11EventFilter (ev=0x7fffb5769380) at kernel/qapplication_x11.cpp:399
#20 0x00007f411884badf in QApplication::x11ProcessEvent (this=0x180e860, event=0x7fffb5769380) at kernel/qapplication_x11.cpp:3231
#21 0x00007f41188794b2 in x11EventSourceDispatch (s=0x181aed0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#22 0x00007f4114fd3609 in g_main_dispatch (context=0x181a040) at gmain.c:1960
#23 IA__g_main_context_dispatch (context=0x181a040) at gmain.c:2513
#24 0x00007f4114fd7368 in g_main_context_iterate (context=0x181a040, block=1, dispatch=1, self=<value optimized out>) at gmain.c:2591
#25 0x00007f4114fd752c in IA__g_main_context_iteration (context=0x181a040, may_block=1) at gmain.c:2654
#26 0x00007f41199fd71c in QEventDispatcherGlib::processEvents (this=0x18170f0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:412
#27 0x00007f4118878faf in QGuiEventDispatcherGlib::processEvents (this=0x2588360, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#28 0x00007f41199ca572 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#29 0x00007f41199caa14 in QEventLoop::exec (this=0x7fffb57696b0, flags=...) at kernel/qeventloop.cpp:201
#30 0x00007f41199cd444 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#31 0x00007f410dde67b7 in kdemain (argc=1, argv=0x17ff6a0) at /var/tmp/portage/kde-base/plasma-workspace-4.4.1/work/plasma-workspace-4.4.1/plasma/desktop/shell/main.cpp:112
#32 0x000000000040779b in launch (argc=1, _name=0x17c8148 "/usr/bin/plasma-desktop", args=0x17c8160 "", cwd=0x0, envc=0, envs=<value optimized out>, reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x40c64c "0") at /var/tmp/portage/kde-base/kdelibs-4.4.1-r1/work/kdelibs-4.4.1/kinit/kinit.cpp:710
#33 0x0000000000408322 in handle_launcher_request (sock=9, who=<value optimized out>) at /var/tmp/portage/kde-base/kdelibs-4.4.1-r1/work/kdelibs-4.4.1/kinit/kinit.cpp:1202
#34 0x0000000000408a41 in handle_requests (waitForPid=0) at /var/tmp/portage/kde-base/kdelibs-4.4.1-r1/work/kdelibs-4.4.1/kinit/kinit.cpp:1395
#35 0x0000000000408fcd in main (argc=4, argv=0x7fffb576a3b8, envp=0x7fffb576a3e0) at /var/tmp/portage/kde-base/kdelibs-4.4.1-r1/work/kdelibs-4.4.1/kinit/kinit.cpp:1834