Application: kwin (4.11.9)
KDE Platform Version: 4.11.2
Qt Version: 4.8.5
Operating System: Linux 3.11.10-11-default x86_64
Distribution: "openSUSE 13.1 (Bottle) (x86_64)"

-- Information about the crash:
- What I was doing when the application crashed:

When changing "Compositing type" from XRender/Native to OpenGL 3.1/Raster, happens after Apply.  The is in a VirtualBox VM (version 4.3.12.r93733/Tools 4.3.13-93885.iso)

Attempting to use KWin extended features.

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fa11e7d5880 (LWP 2332))]

Thread 3 (Thread 0x7fa0fbdca700 (LWP 2342)):
#0  0x00007fa117faa0af in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fa11d19d8cb in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x7fa11d49bf00 <QTWTF::pageheap_memory>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007fa11d19d909 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007fa117fa60db in start_thread () from /lib64/libpthread.so.0
#4  0x00007fa11dfa190d in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7fa07b0cd700 (LWP 2352)):
#0  0x00007fa11df7258d in nanosleep () from /lib64/libc.so.6
#1  0x00007fa07b31a116 in RTThreadSleep () from /usr/lib64/dri/vboxvideo_dri.so
#2  0x00007fa07b2e5d83 in ?? () from /usr/lib64/dri/vboxvideo_dri.so
#3  0x00007fa07b31c47c in ?? () from /usr/lib64/dri/vboxvideo_dri.so
#4  0x00007fa07b3287ad in ?? () from /usr/lib64/dri/vboxvideo_dri.so
#5  0x00007fa117fa60db in start_thread () from /lib64/libpthread.so.0
#6  0x00007fa11dfa190d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fa11e7d5880 (LWP 2332)):
[KCrash Handler]
#5  0x00007fa079cac568 in ?? () from /usr/lib64/VBoxOGLpackspu.so
#6  0x00007fa119062abe in KWin::GLTexture::GLTexture (this=0x7fff693b8710, width=982, height=626) at /usr/src/debug/kde-workspace-4.11.9/kwin/libkwineffects/kwingltexture.cpp:106
#7  0x00007fa07add90f3 in KWin::BlurEffect::BlurEffect (this=0x151db00) at /usr/src/debug/kde-workspace-4.11.9/kwin/effects/blur/blur.cpp:45
#8  0x00007fa07add93a6 in KWin::effect_create_kwin4_effect_blur () at /usr/src/debug/kde-workspace-4.11.9/kwin/effects/blur/blur.cpp:35
#9  0x00007fa11e35d06c in KWin::EffectsHandlerImpl::loadEffect (this=this@entry=0x133a8f0, name=..., checkDefault=<optimized out>) at /usr/src/debug/kde-workspace-4.11.9/kwin/effects.cpp:1456
#10 0x00007fa11e35db5f in KWin::EffectsHandlerImpl::slotEffectsQueried (this=0x133a8f0) at /usr/src/debug/kde-workspace-4.11.9/kwin/effects.cpp:348
#11 0x00007fa11e2b8eb5 in KWin::EffectsHandlerImpl::qt_static_metacall (_o=0x8058, _id=32993, _a=0x7fff693b8b00, _c=<optimized out>) at /usr/src/debug/kde-workspace-4.11.9/build/kwin/moc_effects.cpp:168
#12 0x00007fa118350d68 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib64/libQtCore.so.4
#13 0x00007fa11822e458 in QFutureWatcherBase::event(QEvent*) () from /usr/lib64/libQtCore.so.4
#14 0x00007fa1174bc8ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#15 0x00007fa1174c2e70 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#16 0x00007fa11cbef18a in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#17 0x00007fa11833d0ad in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQtCore.so.4
#18 0x00007fa1183400ff in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib64/libQtCore.so.4
#19 0x00007fa11755a0ac in ?? () from /usr/lib64/libQtGui.so.4
#20 0x00007fa11833bd0f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#21 0x00007fa11833c005 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#22 0x00007fa11834113b in QCoreApplication::exec() () from /usr/lib64/libQtCore.so.4
#23 0x00007fa11e2e8186 in kdemain (argc=2, argv=0x7fff693b9448) at /usr/src/debug/kde-workspace-4.11.9/kwin/main.cpp:597
#24 0x00007fa11dedbbe5 in __libc_start_main () from /lib64/libc.so.6
#25 0x0000000000400761 in _start () at ../sysdeps/x86_64/start.S:122

Possible duplicates by query: bug 320000.

Reported using DrKonqi