Application: systemsettings (1.0)
KDE Platform Version: 4.8.3 (4.8.3) "release 504"
Qt Version: 4.8.1
Operating System: Linux 3.1.10-1.9-desktop x86_64
Distribution: "openSUSE 12.1 (x86_64)"

-- Information about the crash:
KDE desktop environment was starting up normally. Compositing crashes also when re-enabling it from Configure Desktop->Desktop Effects->General->Re-enable OpenGL detection.

The crash can be reproduced every time.

-- Backtrace:
Application: System Settings (systemsettings), signal: Segmentation fault
[KCrash Handler]
#6  0x00007f8e4ca7e397 in nv50_screen_fence_update (pscreen=0xc7ba60) at nv50_screen.c:269
#7  0x00007f8e4cabe323 in nouveau_fence_update (screen=0xc7ba60, flushed=1 '\001') at nouveau_fence.c:141
#8  0x00007f8e4ca8021b in nv50_default_flush_notify (chan=<optimized out>) at nv50_context.c:68
#9  0x00007f8e4c67482c in nouveau_pushbuf_flush (chan=0xe27300, min=0) at nouveau_pushbuf.c:276
#10 0x00007f8e4c674b32 in FIRE_RING (chan=0xe27300) at nouveau_pushbuf.h:101
#11 nouveau_grobj_free (grobj=<optimized out>) at nouveau_grobj.c:102
#12 0x00007f8e4ca7e56e in nv50_screen_destroy (pscreen=0xc7ba60) at nv50_screen.c:235
#13 0x00007f8e4ca3f010 in dri_destroy_screen_helper (screen=0xca9730) at dri_screen.c:352
#14 0x00007f8e4ca3f0a0 in dri_destroy_screen (sPriv=0xca9500) at dri_screen.c:362
#15 0x00007f8e4ca3b270 in driDestroyScreen (psp=0xca9500) at ../common/dri_util.c:732
#16 0x00007f8e4e800d4b in dri2_terminate (drv=<optimized out>, disp=0xe255d0) at egl_dri2.c:582
#17 0x00007f8e4e7f984d in eglTerminate (dpy=0xe255d0) at eglapi.c:351
#18 0x00007f8e4ec9ecb6 in KWin::CompositingPrefs::deleteEGLContext (this=0xbef568) at /usr/src/debug/kde-workspace-4.8.3/kwin/compositingprefs.cpp:372
#19 0x00007f8e4ec9ef64 in KWin::CompositingPrefs::detect (this=0xbef568) at /usr/src/debug/kde-workspace-4.8.3/kwin/compositingprefs.cpp:173
#20 0x00007f8e4ec936ac in KWin::KWinCompositingConfig::updateStatusUI (this=0xbef300, compositingIsPossible=<optimized out>) at /usr/src/debug/kde-workspace-4.8.3/kwin/kcmkwin/kwincompositing/main.cpp:369
#21 0x00007f8e4ec95e97 in KWin::KWinCompositingConfig::load (this=0xbef300) at /usr/src/debug/kde-workspace-4.8.3/kwin/kcmkwin/kwincompositing/main.cpp:387
#22 0x00007f8e4ec92d61 in KWin::KWinCompositingConfig::rearmGlSupport (this=0xbef300) at /usr/src/debug/kde-workspace-4.8.3/kwin/kcmkwin/kwincompositing/main.cpp:303
#23 0x00007f8e5fe410f1 in QMetaObject::activate (sender=0xbf6700, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fff775a73e0) at kernel/qobject.cpp:3556
#24 0x00007f8e6114a992 in QAbstractButton::clicked (this=<optimized out>, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:220
#25 0x00007f8e60e8960e in QAbstractButtonPrivate::emitClicked (this=<optimized out>) at widgets/qabstractbutton.cpp:548
#26 0x00007f8e60e8a94b in QAbstractButtonPrivate::click (this=0xbff880) at widgets/qabstractbutton.cpp:541
#27 0x00007f8e60e8abbc in QAbstractButton::mouseReleaseEvent (this=0xbf6700, e=0x7fff775a7cb0) at widgets/qabstractbutton.cpp:1123
#28 0x00007f8e60b107e4 in QWidget::event (this=0xbf6700, event=0x7fff775a7cb0) at kernel/qwidget.cpp:8362
#29 0x00007f8e60ac00d4 in notify_helper (e=0x7fff775a7cb0, receiver=0xbf6700, this=0x64a1b0) at kernel/qapplication.cpp:4554
#30 QApplicationPrivate::notify_helper (this=0x64a1b0, receiver=0xbf6700, e=0x7fff775a7cb0) at kernel/qapplication.cpp:4526
#31 0x00007f8e60ac5823 in QApplication::notify (this=<optimized out>, receiver=0xbf6700, e=0x7fff775a7cb0) at kernel/qapplication.cpp:4097
#32 0x00007f8e618048f6 in KApplication::notify (this=0x7fff775a89b0, receiver=0xbf6700, event=0x7fff775a7cb0) at /usr/src/debug/kdelibs-4.8.3/kdeui/kernel/kapplication.cpp:311
#33 0x00007f8e5fe2d22c in QCoreApplication::notifyInternal (this=0x7fff775a89b0, receiver=0xbf6700, event=0x7fff775a7cb0) at kernel/qcoreapplication.cpp:876
#34 0x00007f8e60ac10a2 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../src/corelib/kernel/qcoreapplication.h:231
#35 QApplicationPrivate::sendMouseEvent (receiver=0xbf6700, event=0x7fff775a7cb0, alienWidget=0xbf6700, nativeWidget=0x7c1e10, buttonDown=0xbf6700, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3165
#36 0x00007f8e60b3ce85 in QETWidget::translateMouseEvent (this=0x7c1e10, event=<optimized out>) at kernel/qapplication_x11.cpp:4513
#37 0x00007f8e60b3bd4a in QApplication::x11ProcessEvent (this=0x7fff775a89b0, event=0x7fff775a8570) at kernel/qapplication_x11.cpp:3636
#38 0x00007f8e60b63ae2 in x11EventSourceDispatch (s=0x64dba0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#39 0x00007f8e5cda258d in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#40 0x00007f8e5cda2d88 in ?? () from /usr/lib64/libglib-2.0.so.0
#41 0x00007f8e5cda2f59 in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#42 0x00007f8e5fe5c27f in QEventDispatcherGlib::processEvents (this=0x61e110, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#43 0x00007f8e60b6376e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#44 0x00007f8e5fe2c012 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#45 0x00007f8e5fe2c267 in QEventLoop::exec (this=0x7fff775a8940, flags=...) at kernel/qeventloop.cpp:204
#46 0x00007f8e5fe30dc5 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#47 0x000000000040b235 in ?? ()
#48 0x00007f8e5f63423d in __libc_start_main () from /lib64/libc.so.6
#49 0x000000000040b289 in _start ()

Reported using DrKonqi