Version:            (using KDE 4.2.4)
OS:                Linux
Installed from:    Gentoo Packages

Crash after few time. I don't know if is asame bug than other.

The backtrace:
Application: Plasma Workspace (plasma), signal SIGSEGV
0x00007fa85b15c881 in nanosleep () from /lib/libc.so.6
Current language:  auto; currently c
[Current thread is 0 (LWP 6607)]

Thread 5 (Thread 0x7fa8426ca910 (LWP 6608)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007fa85e1feb75 in QWaitCondition::wait (this=0x18df680, mutex=0x18df678, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007fa85f80de4c in QHostInfoAgent::run (this=0x18df660) at kernel/qhostinfo.cpp:260
#3  0x00007fa85e1fdf24 in QThreadPrivate::start (arg=0x18df660) at thread/qthread_unix.cpp:188
#4  0x00007fa85df892f7 in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007fa85b18d7ad in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7fa841483910 (LWP 6609)):
#0  0x00007fa85b186bd2 in select () from /lib/libc.so.6
#1  0x00007fa85e2cb962 in QProcessManager::run (this=0x137cf20) at io/qprocess_unix.cpp:296
#2  0x00007fa85e1fdf24 in QThreadPrivate::start (arg=0x137cf20) at thread/qthread_unix.cpp:188
#3  0x00007fa85df892f7 in start_thread (arg=<value optimized out>) at pthread_create.c:297
#4  0x00007fa85b18d7ad in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()
Current language:  auto; currently asm

Thread 3 (Thread 0x7fa840a73910 (LWP 6611)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007fa85e1feb75 in QWaitCondition::wait (this=0x14bc380, mutex=0x14bc378, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007fa842fd01ae in RenderThread::run (this=0x14bc368) at /var/tmp/portage/kde-base/plasma-workspace-4.2.4/work/plasma-workspace-4.2.4/plasma/wallpapers/image/renderthread.cpp:91
#3  0x00007fa85e1fdf24 in QThreadPrivate::start (arg=0x14bc368) at thread/qthread_unix.cpp:188
#4  0x00007fa85df892f7 in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007fa85b18d7ad in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()
Current language:  auto; currently c

Thread 2 (Thread 0x7fa83b443910 (LWP 6612)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007fa85e1feb75 in QWaitCondition::wait (this=0x17da080, mutex=0x17da078, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007fa842fd01ae in RenderThread::run (this=0x17da068) at /var/tmp/portage/kde-base/plasma-workspace-4.2.4/work/plasma-workspace-4.2.4/plasma/wallpapers/image/renderthread.cpp:91
#3  0x00007fa85e1fdf24 in QThreadPrivate::start (arg=0x17da068) at thread/qthread_unix.cpp:188
#4  0x00007fa85df892f7 in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007fa85b18d7ad in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()
Current language:  auto; currently asm

Thread 1 (Thread 0x7fa860c49790 (LWP 6607)):
[KCrash Handler]
#5  0x0000000000000000 in ?? ()
#6  0x00007fa85d4c9044 in blend_src_generic<RegularSpans> (count=21, spans=0x7fff088343d0, userData=<value optimized out>) at painting/qdrawhelper.cpp:3388
#7  0x00007fa85d4cccae in blend_transformed_tiled_argb<RegularSpans> (count=142795168, spans=0x7fff088321a0, userData=0x6cbf670) at painting/qdrawhelper.cpp:6343
#8  0x00007fa85d47b380 in QRasterizer::rasterize (this=0x688c670, path=@0x7fff08834d30, fillRule=<value optimized out>) at painting/qrasterizer.cpp:105
#9  0x00007fa85d4ab0a7 in QRasterPaintEngine::fillPath (this=0x66aa730, path=@0x7fff088353d0, fillData=0x6cbf670) at painting/qpaintengine_raster.cpp:1398
#10 0x00007fa85d4b6ca1 in QRasterPaintEngine::drawPath (this=0x66aa730, path=@0x7fff088353d0) at painting/qpaintengine_raster.cpp:1933
#11 0x00007fa85d4357fd in QPainterPrivate::draw_helper (this=0x6d86400, originalPath=@0x7fff088353d0, op=<value optimized out>) at painting/qpainter.cpp:451
#12 0x00007fa85d438a06 in QPainter::drawRects (this=<value optimized out>, rects=<value optimized out>, rectCount=1) at painting/qpainter.cpp:3355
#13 0x00007fa85d43abe7 in QPainter::drawPixmap (this=0x7fff08836150, r=<value optimized out>, pm=@0x7fff08835620, sr=<value optimized out>)
    at ../../include/QtGui/../../src/gui/painting/qpainter.h:604
#14 0x00007fa85d3aa5d2 in QPixmapIconEngine::paint (this=<value optimized out>, painter=0x7fff08836150, rect=@0x7fff08835680, mode=<value optimized out>, state=<value optimized out>)
    at ../../include/QtGui/../../src/gui/painting/qpainter.h:809
#15 0x00007fa85d3aa47f in QIcon::paint (this=0x7fff08835c20, painter=0x7fff08836150, rect=@0x7fff08835ac0, alignment={i = 142826640}, mode=QIcon::Normal, state=QIcon::Off) at image/qicon.cpp:759
#16 0x00007fa86059e59a in Plasma::Delegate::paint (this=0x6a63d90, painter=0x7fff08836150, option=@0x7fff08836050, index=@0x7fff088360e0)
    at /var/tmp/portage/kde-base/kdelibs-4.2.4-r3/work/kdelibs-4.2.4/plasma/delegate.cpp:270
#17 0x00007fa8365a1362 in ItemDelegate::paint (this=0x7fff0882e1a0, painter=0x7fff088321a0, option=@0x6cbf670, index=@0x0) at /home/user/gx_mail_notify-0.4.1/itemdelegate.cpp:54
#18 0x00007fa83659eacf in MailCheckerView::paintEvent (this=0x68486a0, event=<value optimized out>) at /home/user/gx_mail_notify-0.4.1/mail_checker_view.cpp:463
#19 0x00007fa85d36a1a6 in QWidget::event (this=0x68486a0, event=0x7fff08836c10) at kernel/qwidget.cpp:7687
#20 0x00007fa85d6ea79c in QFrame::event (this=0x68486a0, e=0x7fff08836c10) at widgets/qframe.cpp:559
#21 0x00007fa85d820ead in QAbstractItemView::viewportEvent (this=0x68486a0, event=0x7fff08836c10) at itemviews/qabstractitemview.cpp:1476
#22 0x00007fa85e2ebe87 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<value optimized out>, receiver=0x699dcc0, event=0x7fff08836c10) at kernel/qcoreapplication.cpp:726
#23 0x00007fa85d30f5bc in QApplicationPrivate::notify_helper (this=0x1389e10, receiver=0x699dcc0, e=0x7fff08836c10) at kernel/qapplication.cpp:4052
#24 0x00007fa85d31841e in QApplication::notify (this=0x1383090, receiver=0x699dcc0, e=0x7fff08836c10) at kernel/qapplication.cpp:4021
#25 0x00007fa85eede330 in KApplication::notify (this=0x1383090, receiver=0x699dcc0, event=0x7fff08836c10)
    at /var/tmp/portage/kde-base/kdelibs-4.2.4-r3/work/kdelibs-4.2.4/kdeui/kernel/kapplication.cpp:307
#26 0x00007fa85e2ec46b in QCoreApplication::notifyInternal (this=0x1383090, receiver=0x699dcc0, event=0x7fff08836c10) at kernel/qcoreapplication.cpp:606
#27 0x00007fa85d36cfed in QWidgetPrivate::drawWidget (this=0x6b68f20, pdev=0x1af4098, rgn=@0x7fff08836e60, offset=@0x7fff08836e50, flags=<value optimized out>, sharedPainter=0x7fff08838980, 
    backingStore=0x0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#28 0x00007fa85d36d8c9 in QWidgetPrivate::paintSiblingsRecursive (this=0x1d4e5f0, pdev=0x1af4098, siblings=@0x1d4e608, index=0, rgn=@0x7fff088371a0, offset=@0x7fff08837190, flags=14, 
    sharedPainter=0x7fff08838980, backingStore=0x0) at kernel/qwidget.cpp:5189
#29 0x00007fa85d36ccd9 in QWidgetPrivate::drawWidget (this=0x1d4e5f0, pdev=0x1af4098, rgn=@0x7fff088371a0, offset=@0x7fff08837190, flags=14, sharedPainter=0x7fff08838980, backingStore=0x0)
    at kernel/qwidget.cpp:5128
#30 0x00007fa85d36d8c9 in QWidgetPrivate::paintSiblingsRecursive (this=0x6c85550, pdev=0x1af4098, siblings=@0x6c85568, index=1, rgn=@0x7fff088374d0, offset=@0x7fff088374c0, flags=14, 
    sharedPainter=0x7fff08838980, backingStore=0x0) at kernel/qwidget.cpp:5189
#31 0x00007fa85d36ccd9 in QWidgetPrivate::drawWidget (this=0x6c85550, pdev=0x1af4098, rgn=@0x7fff088374d0, offset=@0x7fff088374c0, flags=14, sharedPainter=0x7fff08838980, backingStore=0x0)
    at kernel/qwidget.cpp:5128
#32 0x00007fa85d36db2d in QWidget::render (this=<value optimized out>, target=0x1af4098, targetOffset=@0x7fff088377d0, sourceRegion=<value optimized out>, renderFlags={i = 142833344})
    at kernel/qwidget.cpp:4762
#33 0x00007fa85d36e890 in QWidget::render (this=0x6c376d0, painter=0x7fff08838980, targetOffset=@0x7fff088377d0, sourceRegion=<value optimized out>, renderFlags={i = 142833648})
    at kernel/qwidget.cpp:4848
#34 0x00007fa85d938e1a in QGraphicsProxyWidget::paint (this=<value optimized out>, painter=0x7fff08838980, option=<value optimized out>, widget=<value optimized out>)
    at graphicsview/qgraphicsproxywidget.cpp:1418
#35 0x00007fa85d8f09b5 in _q_paintItem (item=<value optimized out>, painter=0x7fff08838980, option=0x1b38c80, widget=0x1af4060, useWindowOpacity=true, painterStateProtection=true)
    at graphicsview/qgraphicsscene.cpp:4630
#36 0x00007fa85d8f89fc in QGraphicsScenePrivate::drawItemHelper (this=<value optimized out>, item=0x5afaca0, painter=0x7fff08838980, option=0x1b38c80, widget=0x1af4060, painterStateProtection=true)
    at graphicsview/qgraphicsscene.cpp:4699
#37 0x00007fa85d8faa6b in QGraphicsScene::drawItems (this=<value optimized out>, painter=0x7fff08838980, numItems=3, items=0x669cfd0, options=0x1b38b60, widget=0x1af4060)
    at graphicsview/qgraphicsscene.cpp:5102
#38 0x00007fa85d91966c in QGraphicsView::paintEvent (this=0x18016e0, event=<value optimized out>) at graphicsview/qgraphicsview.cpp:3528
#39 0x00007fa85d36a1a6 in QWidget::event (this=0x18016e0, event=0x7fff08839150) at kernel/qwidget.cpp:7687
#40 0x00007fa85d6ea79c in QFrame::event (this=0x18016e0, e=0x7fff08839150) at widgets/qframe.cpp:559
#41 0x00007fa85d9170ab in QGraphicsView::viewportEvent (this=0x18016e0, event=0x7fff08839150) at graphicsview/qgraphicsview.cpp:2919
#42 0x00007fa85e2ebe87 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<value optimized out>, receiver=0x1af4060, event=0x7fff08839150) at kernel/qcoreapplication.cpp:726
#43 0x00007fa85d30f5bc in QApplicationPrivate::notify_helper (this=0x1389e10, receiver=0x1af4060, e=0x7fff08839150) at kernel/qapplication.cpp:4052
#44 0x00007fa85d31841e in QApplication::notify (this=0x1383090, receiver=0x1af4060, e=0x7fff08839150) at kernel/qapplication.cpp:4021
#45 0x00007fa85eede330 in KApplication::notify (this=0x1383090, receiver=0x1af4060, event=0x7fff08839150)
    at /var/tmp/portage/kde-base/kdelibs-4.2.4-r3/work/kdelibs-4.2.4/kdeui/kernel/kapplication.cpp:307
#46 0x00007fa85e2ec46b in QCoreApplication::notifyInternal (this=0x1383090, receiver=0x1af4060, event=0x7fff08839150) at kernel/qcoreapplication.cpp:606
#47 0x00007fa85d36cfed in QWidgetPrivate::drawWidget (this=0x1af4e60, pdev=0x1af4098, rgn=@0x7fff088395e0, offset=@0x7fff088395d0, flags=<value optimized out>, sharedPainter=0x0, 
    backingStore=0x1af5690) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#48 0x00007fa85d4f862d in QWidgetBackingStore::sync (this=0x1af5690) at painting/qbackingstore.cpp:1261
#49 0x00007fa85d35ef43 in QWidgetPrivate::syncBackingStore (this=0x1af20a0) at kernel/qwidget.cpp:1603
#50 0x00007fa85d36a0ad in QWidget::event (this=0x18016e0, event=0x5255270) at kernel/qwidget.cpp:7827
#51 0x00007fa85d6ea79c in QFrame::event (this=0x18016e0, e=0x5255270) at widgets/qframe.cpp:559
#52 0x00007fa85d77de61 in QAbstractScrollArea::event (this=0x18016e0, e=0x5255270) at widgets/qabstractscrollarea.cpp:918
#53 0x00007fa85d30f5dd in QApplicationPrivate::notify_helper (this=0x1389e10, receiver=0x18016e0, e=0x5255270) at kernel/qapplication.cpp:4056
#54 0x00007fa85d31841e in QApplication::notify (this=0x1383090, receiver=0x18016e0, e=0x5255270) at kernel/qapplication.cpp:4021
#55 0x00007fa85eede330 in KApplication::notify (this=0x1383090, receiver=0x18016e0, event=0x5255270) at /var/tmp/portage/kde-base/kdelibs-4.2.4-r3/work/kdelibs-4.2.4/kdeui/kernel/kapplication.cpp:307
#56 0x00007fa85e2ec46b in QCoreApplication::notifyInternal (this=0x1383090, receiver=0x18016e0, event=0x5255270) at kernel/qcoreapplication.cpp:606
#57 0x00007fa85e2efcd5 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x134a790) at kernel/qcoreapplication.h:213
#58 0x00007fa85e317193 in postEventSourceDispatch (s=<value optimized out>) at kernel/qcoreapplication.h:218
#59 0x00007fa858206739 in IA__g_main_context_dispatch (context=0x138c440) at gmain.c:2144
#60 0x00007fa85820a0ad in g_main_context_iterate (context=0x138c440, block=1, dispatch=1, self=<value optimized out>) at gmain.c:2778
#61 0x00007fa85820a25d in IA__g_main_context_iteration (context=0x138c440, may_block=1) at gmain.c:2841
#62 0x00007fa85e316e4f in QEventDispatcherGlib::processEvents (this=0x1389b30, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#63 0x00007fa85d3a78e8 in QGuiEventDispatcherGlib::processEvents (this=0x7fff0882e1a0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#64 0x00007fa85e2ead72 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 142843936}) at kernel/qeventloop.cpp:149
#65 0x00007fa85e2eaf5c in QEventLoop::exec (this=0x7fff0883a060, flags={i = 142844016}) at kernel/qeventloop.cpp:197
#66 0x00007fa85e2eff9e in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#67 0x00007fa8609207eb in kdemain (argc=1, argv=0x7fff0883a378) at /var/tmp/portage/kde-base/plasma-workspace-4.2.4/work/plasma-workspace-4.2.4/plasma/shells/desktop/main.cpp:54
#68 0x00007fa85b0d9a26 in __libc_start_main (main=0x400a40 <main>, argc=1, ubp_av=0x7fff0883a378, init=0x400aa0 <__libc_csu_init>, fini=<value optimized out>, rtld_fini=<value optimized out>, 
    stack_end=0x7fff0883a368) at libc-start.c:220
#69 0x0000000000400929 in _start () at ../sysdeps/x86_64/elf/start.S:113
#0  0x00007fa85b15c881 in nanosleep () from /lib/libc.so.6
Current language:  auto; currently c