Plasma crashed with SIGSEGV in blend_src_generic<RegularSpans>

[zdenek.zikan]

When I pushed the keyboard shortcut to enable effects, the plasma workspace has crashed with following backtrace

Application: Plasma Workspace (plasma), signal SIGSEGV
[Current thread is 0 (LWP 4066)]

Thread 4 (Thread 0xa92f5b90 (LWP 4069)):
#0 0xb7fc7430 in __kernel_vsyscall ()
#1 0xb62f77b1 in select () from /lib/tls/i686/cmov/libc.so.6
#2 0xb65cb380 in QProcessManager::run (this=0x812a410) at io/qprocess_unix.cpp:305
#3 0xb64f996e in QThreadPrivate::start (arg=0x812a410) at thread/qthread_unix.cpp:189
#4 0xb51524ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#5 0xb62ff49e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 3 (Thread 0xa8af4b90 (LWP 4071)):
#0 0xb7fc7430 in __kernel_vsyscall ()
#1 0xb51560e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2 0xb630e2ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3 0xb64fa9b2 in QWaitCondition::wait (this=0x8585ed0, mutex=0x8585ecc, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4 0xb797c152 in QHostInfoAgent::run (this=0x8585ec0) at kernel/qhostinfo.cpp:260
#5 0xb64f996e in QThreadPrivate::start (arg=0x8585ec0) at thread/qthread_unix.cpp:189
#6 0xb51524ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7 0xb62ff49e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread 0xa805db90 (LWP 4072)):
#0 0xb7fc7430 in __kernel_vsyscall ()
#1 0xb51560e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2 0xb630e2ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3 0xb64fa9b2 in QWaitCondition::wait (this=0x844dd20, mutex=0x844dd1c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4 0xa9482b9a in RenderThread::run (this=0x844dd14) at /build/buildd/kdebase-workspace-4.2.2/plasma/wallpapers/image/renderthread.cpp:91
#5 0xb64f996e in QThreadPrivate::start (arg=0x844dd14) at thread/qthread_unix.cpp:189
#6 0xb51524ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7 0xb62ff49e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb4c43710 (LWP 4066)):
[KCrash Handler]
#6 0x00000000 in ?? ()
#7 0xb6a51ee0 in blend_transformed_bilinear_tiled_argb<RegularSpans> (count=175, spans=0xa270d1c, userData=0x8626de8) at painting/qdrawhelper.cpp:5741
#8 0xb6a4e2d0 in qBlendTexture (count=175, spans=0xa270d1c, userData=0x8626de8) at painting/qdrawhelper.cpp:7030
#9 0xb6a951bb in gray_convert_glyph (worker=0xa270908) at painting/qgrayraster.c:1771
#10 0xb6a33936 in QRasterPaintEnginePrivate::rasterize (this=0x9f47c90, outline=0xaf5ae1c, callback=0xb6a4e280 <qBlendTexture(int, QT_FT_Span_ const*, void*)>, userData=0x8626de8)
    at painting/qpaintengine_raster.cpp:3948
#11 0xb6a3cb4f in QRasterPaintEngine::fillPath (this=0x9ee1f30, path=@0xbfae3134, fillData=0x8626de8) at painting/qpaintengine_raster.cpp:1364
#12 0xb6a48a61 in QRasterPaintEngine::drawPath (this=0x9ee1f30, path=@0xbfae3134) at painting/qpaintengine_raster.cpp:1887
#13 0xb69d440c in QPainter::drawPath (this=0xbfae30ac, path=@0xbfae3134) at painting/qpainter.cpp:3218
#14 0xb69ce2af in QPainterPrivate::draw_helper (this=0x88df9b0, originalPath=@0xbfae3134, op=<value optimized out>) at painting/qpainter.cpp:451
#15 0xb69d13aa in QPainter::drawRects (this=0xbfae4440, rects=0xbfae3210, rectCount=1) at painting/qpainter.cpp:3359
#16 0xb69d3b55 in QPainter::drawPixmap (this=0xbfae4440, r=@0xbfae3328, pm=@0xbfae335c, sr=@0xbfae3308) at ../../include/QtGui/../../src/gui/painting/qpainter.h:604
#17 0xb7e61f2f in Plasma::Svg::paint () from /usr/lib/libplasma.so.3
#18 0xb7e8537f in ?? () from /usr/lib/libplasma.so.3
#19 0xb7e851de in Plasma::Meter::paint () from /usr/lib/libplasma.so.3
#20 0xb6eed6e4 in _q_paintItem (item=<value optimized out>, painter=0xbfae4440, option=0x883c8d0, widget=0x87eb398, useWindowOpacity=true, painterStateProtection=true)
    at graphicsview/qgraphicsscene.cpp:4483
#21 0xb6ef2aaa in QGraphicsScenePrivate::drawItemHelper (this=0x81ad280, item=0x89997f8, painter=0xbfae4440, option=0x883c8d0, widget=0x87eb398, painterStateProtection=<value optimized out>)
    at graphicsview/qgraphicsscene.cpp:4552
#22 0xb6ef4c7f in QGraphicsScene::drawItems (this=0x819d180, painter=0xbfae4440, numItems=46, items=0xac21e10, options=0x883c4b0, widget=0x87eb398) at graphicsview/qgraphicsscene.cpp:4957
#23 0xb6f073ec in QGraphicsView::drawItems (this=0x87ea9b8, painter=0xbfae4440, numItems=46, items=0xac21e10, options=0x883c4b0) at graphicsview/qgraphicsview.cpp:3783
#24 0xb6f14e42 in QGraphicsView::paintEvent (this=0x87ea9b8, event=0xbfae49c4) at graphicsview/qgraphicsview.cpp:3542
#25 0xb68f19ae in QWidget::event (this=0x87ea9b8, event=0xbfae49c4) at kernel/qwidget.cpp:7654
#26 0xb6ccbd83 in QFrame::event (this=0x87ea9b8, e=0xbfae49c4) at widgets/qframe.cpp:559
#27 0xb6d6bd3f in QAbstractScrollArea::viewportEvent (this=0x87ea9b8, e=0xbfae0778) at widgets/qabstractscrollarea.cpp:962
#28 0xb6f0f4f2 in QGraphicsView::viewportEvent (this=0x87ea9b8, event=0xbfae49c4) at graphicsview/qgraphicsview.cpp:2933
#29 0xb6d6e345 in QAbstractScrollAreaFilter::eventFilter (this=0x87eb2c0, o=0x87eb398, e=0xbfae49c4) at widgets/qabstractscrollarea_p.h:100
#30 0xb65ecc5a in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x8130ac8, receiver=0x87eb398, event=0xbfae49c4) at kernel/qcoreapplication.cpp:718
#31 0xb689af0a in QApplicationPrivate::notify_helper (this=0x8130ac8, receiver=0x87eb398, e=0xbfae49c4) at kernel/qapplication.cpp:4080
#32 0xb68a3312 in QApplication::notify (this=0x812ea68, receiver=0x87eb398, e=0xbfae49c4) at kernel/qapplication.cpp:4049
#33 0xb76f394d in KApplication::notify (this=0x812ea68, receiver=0x87eb398, event=0xbfae49c4) at /build/buildd/kde4libs-4.2.2/kdeui/kernel/kapplication.cpp:307
#34 0xb65eda3b in QCoreApplication::notifyInternal (this=0x812ea68, receiver=0x87eb398, event=0xbfae49c4) at kernel/qcoreapplication.cpp:602
#35 0xb68a607e in QCoreApplication::sendSpontaneousEvent (receiver=0x87eb398, event=0xbfae0778) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#36 0xb68f97a9 in QWidgetPrivate::drawWidget (this=0x87eb3c0, pdev=0x87ebc74, rgn=@0xbfae4bf0, offset=@0xbfae4bc0, flags=68, sharedPainter=0x0, backingStore=0x87eb280) at kernel/qwidget.cpp:5046
#37 0xb6ab6055 in QWidgetBackingStore::sync (this=0x87eb280) at painting/qbackingstore.cpp:1258
#38 0xb68e9c46 in QWidgetPrivate::syncBackingStore (this=0x87ee8e0) at kernel/qwidget.cpp:1603
#39 0xb68f1e15 in QWidget::event (this=0x87ea9b8, event=0xa308a38) at kernel/qwidget.cpp:7794
#40 0xb6ccbd83 in QFrame::event (this=0x87ea9b8, e=0xa308a38) at widgets/qframe.cpp:559
#41 0xb6d6c83d in QAbstractScrollArea::event (this=0x87ea9b8, e=0xa308a38) at widgets/qabstractscrollarea.cpp:918
#42 0xb6f0f3e6 in QGraphicsView::event (this=0x87ea9b8, event=0xa308a38) at graphicsview/qgraphicsview.cpp:2854
#43 0xb689af2c in QApplicationPrivate::notify_helper (this=0x8130ac8, receiver=0x87ea9b8, e=0xa308a38) at kernel/qapplication.cpp:4084
#44 0xb68a3312 in QApplication::notify (this=0x812ea68, receiver=0x87ea9b8, e=0xa308a38) at kernel/qapplication.cpp:4049
#45 0xb76f394d in KApplication::notify (this=0x812ea68, receiver=0x87ea9b8, event=0xa308a38) at /build/buildd/kde4libs-4.2.2/kdeui/kernel/kapplication.cpp:307
#46 0xb65eda3b in QCoreApplication::notifyInternal (this=0x812ea68, receiver=0x87ea9b8, event=0xa308a38) at kernel/qcoreapplication.cpp:602
#47 0xb65ee695 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x80f12c8) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#48 0xb65ee88d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1132
#49 0xb66197ef in postEventSourceDispatch (s=0x8132b10) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#50 0xb4f50b88 in IA__g_main_context_dispatch (context=0x8132a90) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:1814
#51 0xb4f540eb in g_main_context_iterate (context=0x8132a90, block=1, dispatch=1, self=0x8130628) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2448
#52 0xb4f54268 in IA__g_main_context_iteration (context=0x8132a90, may_block=1) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2511
#53 0xb6619438 in QEventDispatcherGlib::processEvents (this=0x80f40f0, flags={i = -1079094392}) at kernel/qeventdispatcher_glib.cpp:323
#54 0xb693c3f5 in QGuiEventDispatcherGlib::processEvents (this=0x80f40f0, flags={i = -1079094344}) at kernel/qguieventdispatcher_glib.cpp:202
#55 0xb65ec06a in QEventLoop::processEvents (this=0xbfae5430, flags={i = -1079094280}) at kernel/qeventloop.cpp:149
#56 0xb65ec4aa in QEventLoop::exec (this=0xbfae5430, flags={i = -1079094216}) at kernel/qeventloop.cpp:200
#57 0xb65ee959 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#58 0xb689ada7 in QApplication::exec () at kernel/qapplication.cpp:3553
#59 0xb7f69b56 in kdemain (argc=1, argv=0xbfae55e4) at /build/buildd/kdebase-workspace-4.2.2/plasma/shells/desktop/main.cpp:54
#60 0x08048712 in main (argc=151147328, argv=0xb6a4e280) at /build/buildd/kdebase-workspace-4.2.2/obj-i486-linux-gnu/plasma/shells/desktop/plasma_qgv_dummy.cpp:3

[zdenek.zikan (zdenek-zikan)]

Oh, I forgot, it was on Kubuntu 9.04 Jaunty RC with the latest updates.

$ plasma --version
<unknown program name>(4516)/ checkComposite: Plasma has an argb visual 0x919e698 81788929
<unknown program name>(4516)/ checkComposite: Plasma can use COMPOSITE for effects on 0x919df68
Qt: 4.5.0
KDE: 4.2.2 (KDE 4.2.2)
Plasma Workspace: 0.3

Packages versions:
kdebase-workspace-bin: 4:4.2.2-0ubuntu2
libplasma3: 4:4.2.2-0ubuntu5

Anything else you might need to know?

[Jonathan Thomas (echidnaman)]

Looks like a bug in the raster rendering system of Qt.

[Jonathan Thomas (echidnaman)]

Fixed in Qt 4.6.