Version:            (using KDE 4.2.2)
Compiler:          gcc (Gentoo 4.3.3-r2 p1.1, pie-10.1.5) 4.3.3 CFLAGS="-march=athlon64 -O2 -ggdb -pipe"
OS:                Linux
Installed from:    Gentoo Packages

I dont know when this bug happens. When i got up i see this:

0x00007f4f5ffb78d1 in nanosleep () from /lib/libc.so.6
[Current thread is 0 (LWP 4758)]

Thread 4 (Thread 0x7f4f47933950 (LWP 4759)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f4f62f73439 in QWaitCondition::wait (this=0x24f0a80, mutex=0x24f0a78, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007f4f644afc24 in QHostInfoAgent::run (this=0x24f0a60) at kernel/qhostinfo.cpp:260
#3  0x00007f4f62f726f9 in QThreadPrivate::start (arg=0x24f0a60) at thread/qthread_unix.cpp:189
#4  0x00007f4f62d02007 in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f4f5ffe7f4d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f4f464dd950 (LWP 4760)):
#0  0x00007f4f5ffe1652 in select () from /lib/libc.so.6
#1  0x00007f4f63028775 in QProcessManager::run (this=0x232d2f0) at io/qprocess_unix.cpp:305
#2  0x00007f4f62f726f9 in QThreadPrivate::start (arg=0x232d2f0) at thread/qthread_unix.cpp:189
#3  0x00007f4f62d02007 in start_thread (arg=<value optimized out>) at pthread_create.c:297
#4  0x00007f4f5ffe7f4d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()
Current language:  auto; currently asm

Thread 2 (Thread 0x7f4f458bc950 (LWP 4762)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f4f62f73439 in QWaitCondition::wait (this=0x2618770, mutex=0x2618768, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007f4f48a566de in ?? () from /usr/kde/4.2/lib64/kde4/plasma_wallpaper_image.so
#3  0x00007f4f62f726f9 in QThreadPrivate::start (arg=0x2618758) at thread/qthread_unix.cpp:189
#4  0x00007f4f62d02007 in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f4f5ffe7f4d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()
Current language:  auto; currently c

Thread 1 (Thread 0x7f4f6592f760 (LWP 4758)):
[KCrash Handler]
#5  0x0000000000000000 in ?? ()
#6  0x00007f4f622cccac in blend_src_generic<RegularSpans> (count=<value optimized out>, spans=0x41dfc78, userData=<value optimized out>) at painting/qdrawhelper.cpp:3389
#7  0x00007f4f622ce89e in blend_transformed_bilinear_tiled_argb<RegularSpans> (count=1838627168, spans=0x7fff6d977960, userData=0x3e5e2c0) at painting/qdrawhelper.cpp:5741
#8  0x00007f4f6230df17 in gray_convert_glyph (worker=0x41df500) at painting/qgrayraster.c:1771
#9  0x00007f4f622b4787 in QRasterPaintEnginePrivate::rasterize (this=0x3dfff70, outline=0x3b4c2f0, callback=0x7f4f622cb730 <qBlendTexture(int, QT_FT_Span_ const*, void*)>, 
    userData=<value optimized out>) at painting/qpaintengine_raster.cpp:3958
#10 0x00007f4f622bb979 in QRasterPaintEngine::fillPath (this=0x3952d40, path=@0x7fff6d97a590, fillData=0x3e5e2c0) at painting/qpaintengine_raster.cpp:1367
#11 0x00007f4f622c57b5 in QRasterPaintEngine::drawPath (this=0x3952d40, path=@0x7fff6d97a590) at painting/qpaintengine_raster.cpp:1897
#12 0x00007f4f622591d7 in QPainterPrivate::draw_helper (this=0x37a8e60, originalPath=@0x7fff6d97a590, op=<value optimized out>) at painting/qpainter.cpp:451
#13 0x00007f4f6225bcae in QPainter::drawRects (this=<value optimized out>, rects=<value optimized out>, rectCount=1) at painting/qpainter.cpp:3334
#14 0x00007f4f6225dcd7 in QPainter::drawPixmap (this=0x7fff6d97bce0, r=<value optimized out>, pm=@0x7fff6d97a790, sr=<value optimized out>)
    at ../../include/QtGui/../../src/gui/painting/qpainter.h:604
#15 0x00007f4f6521533f in Plasma::Svg::paint (this=<value optimized out>, painter=0x7fff6d97bce0, rect=@0x7fff6d97a7e0, elementID=<value optimized out>)
    at /var/tmp/portage/kde-base/kdelibs-4.2.2-r1/work/kdelibs-4.2.2/plasma/svg.cpp:457
#16 0x00007f4f65234f54 in Plasma::MeterPrivate::paint (this=0x2dc7a90, p=0x7fff6d97bce0, elementID=@0x7fff6d97aa10)
    at /var/tmp/portage/kde-base/kdelibs-4.2.2-r1/work/kdelibs-4.2.2/plasma/widgets/meter.cpp:83
#17 0x00007f4f65234e19 in Plasma::Meter::paint (this=0x2dc9290, p=0x7fff6d97bce0, option=<value optimized out>, widget=<value optimized out>)
    at /var/tmp/portage/kde-base/kdelibs-4.2.2-r1/work/kdelibs-4.2.2/plasma/widgets/meter.cpp:526
#18 0x00007f4f626adc55 in _q_paintItem (item=<value optimized out>, painter=0x7fff6d97bce0, option=0x2cd7af0, widget=0x2c66d50, useWindowOpacity=true, painterStateProtection=true)
    at graphicsview/qgraphicsscene.cpp:4635
#19 0x00007f4f626b28ae in QGraphicsScenePrivate::drawItemHelper (this=<value optimized out>, item=0x2dc92a0, painter=0x7fff6d97bce0, option=0x2cd7af0, widget=0x2c66d50, painterStateProtection=true)
    at graphicsview/qgraphicsscene.cpp:4704
#20 0x00007f4f626b47e5 in QGraphicsScene::drawItems (this=<value optimized out>, painter=0x7fff6d97bce0, numItems=7, items=0x30425e0, options=<value optimized out>, widget=0x2c66d50)
    at graphicsview/qgraphicsscene.cpp:5115
#21 0x00007f4f626d0994 in QGraphicsView::paintEvent (this=0x2bed420, event=<value optimized out>) at graphicsview/qgraphicsview.cpp:3506
#22 0x00007f4f621a35be in QWidget::event (this=0x2bed420, event=0x7fff6d97c490) at kernel/qwidget.cpp:7659
#23 0x00007f4f624e4d6b in QFrame::event (this=0x2bed420, e=0x7fff6d97c490) at widgets/qframe.cpp:559
#24 0x00007f4f626d314b in QGraphicsView::viewportEvent (this=0x2bed420, event=0x7fff6d97c490) at graphicsview/qgraphicsview.cpp:2897
#25 0x00007f4f63044047 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<value optimized out>, receiver=0x2c66d50, event=0x7fff6d97c490) at kernel/qcoreapplication.cpp:726
#26 0x00007f4f621567ec in QApplicationPrivate::notify_helper (this=0x231e310, receiver=0x2c66d50, e=0x7fff6d97c490) at kernel/qapplication.cpp:4053
#27 0x00007f4f6215f0ea in QApplication::notify (this=0x2314e10, receiver=0x2c66d50, e=0x7fff6d97c490) at kernel/qapplication.cpp:4022
#28 0x00007f4f63bf84cb in KApplication::notify (this=0x2314e10, receiver=0x2c66d50, event=0x7fff6d97c490)
    at /var/tmp/portage/kde-base/kdelibs-4.2.2-r1/work/kdelibs-4.2.2/kdeui/kernel/kapplication.cpp:307
#29 0x00007f4f63044ce3 in QCoreApplication::notifyInternal (this=0x2314e10, receiver=0x2c66d50, event=0x7fff6d97c490) at kernel/qcoreapplication.cpp:606
#30 0x00007f4f621a62f7 in QWidgetPrivate::drawWidget (this=0x2c8eed0, pdev=0x2c99af8, rgn=@0x7fff6d97c8d0, offset=@0x7fff6d97c8c0, flags=<value optimized out>, sharedPainter=0x0, 
    backingStore=0x2bbc630) at kernel/qwidget.cpp:5052
#31 0x00007f4f62328044 in QWidgetBackingStore::sync (this=0x2bbc630) at painting/qbackingstore.cpp:1260
#32 0x00007f4f6219899a in QWidgetPrivate::syncBackingStore (this=0x2c9dcb0) at kernel/qwidget.cpp:1602
#33 0x00007f4f621a34c5 in QWidget::event (this=0x2bed420, event=0x3b52ee0) at kernel/qwidget.cpp:7799
#34 0x00007f4f624e4d6b in QFrame::event (this=0x2bed420, e=0x3b52ee0) at widgets/qframe.cpp:559
#35 0x00007f4f625686f9 in QAbstractScrollArea::event (this=0x2bed420, e=0x3b52ee0) at widgets/qabstractscrollarea.cpp:918
#36 0x00007f4f6215681d in QApplicationPrivate::notify_helper (this=0x231e310, receiver=0x2bed420, e=0x3b52ee0) at kernel/qapplication.cpp:4057
#37 0x00007f4f6215f0ea in QApplication::notify (this=0x2314e10, receiver=0x2bed420, e=0x3b52ee0) at kernel/qapplication.cpp:4022
#38 0x00007f4f63bf84cb in KApplication::notify (this=0x2314e10, receiver=0x2bed420, event=0x3b52ee0) at /var/tmp/portage/kde-base/kdelibs-4.2.2-r1/work/kdelibs-4.2.2/kdeui/kernel/kapplication.cpp:307
#39 0x00007f4f63044ce3 in QCoreApplication::notifyInternal (this=0x2314e10, receiver=0x2bed420, event=0x3b52ee0) at kernel/qcoreapplication.cpp:606
#40 0x00007f4f630455e6 in QCoreApplicationPrivate::sendPostedEvents (receiver=<value optimized out>, event_type=0, data=0x22da1d0)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#41 0x00007f4f63069f73 in postEventSourceDispatch (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#42 0x00007f4f5d0c8142 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#43 0x00007f4f5d0cb85d in ?? () from /usr/lib/libglib-2.0.so.0
#44 0x00007f4f5d0cba1b in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#45 0x00007f4f63069c1f in QEventDispatcherGlib::processEvents (this=0x231dd20, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:324
#46 0x00007f4f621dba5f in QGuiEventDispatcherGlib::processEvents (this=0x7fff6d973960, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#47 0x00007f4f630436e2 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 1838666512}) at kernel/qeventloop.cpp:149
#48 0x00007f4f63043875 in QEventLoop::exec (this=0x7fff6d97d350, flags={i = 1838666592}) at kernel/qeventloop.cpp:196
#49 0x00007f4f63045874 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#50 0x00007f4f6551f5fb in kdemain () from /usr/kde/4.2/lib64/libkdeinit4_plasma.so
#51 0x00007f4f5ff365c6 in __libc_start_main (main=0x4009f0 <_start+240>, argc=1, ubp_av=0x7fff6d97d658, init=0x400a20 <__libc_csu_init>, fini=<value optimized out>, rtld_fini=<value optimized out>, 
    stack_end=0x7fff6d97d648) at libc-start.c:226
#52 0x0000000000400929 in _start ()
Current language:  auto; currently asm
#0  0x00007f4f5ffb78d1 in nanosleep () from /lib/libc.so.6
Current language:  auto; currently c