Application: KWin (kwin), signal: Segmentation fault
[KCrash Handler]
#6  0x00007f3cf75ec485 in dri2DrawableGetMSC (psc=0x7f3ce00013d0, pdraw=0x0, ust=0x7fff1ecebed8, msc=0x7fff1ecebed0, sbc=0x7fff1ecebec8) at dri2_glx.c:226
#7  0x00007f3cf75b0288 in __glXGetVideoSyncSGI (count=0x7fff1ecebf2c) at glxcmds.c:2317
#8  0x00007f3cf9b8c5a1 in KWin::SceneOpenGL::waitSync() () from /usr/lib/libkdeinit4_kwin.so
#9  0x00007f3cf9b90b55 in KWin::SceneOpenGL::flushBuffer(int, QRegion) () from /usr/lib/libkdeinit4_kwin.so
#10 0x00007f3cf9b9132a in KWin::SceneOpenGL::paint(QRegion, QList<KWin::Toplevel*>) () from /usr/lib/libkdeinit4_kwin.so
#11 0x00007f3cf9b7d44c in KWin::Workspace::performCompositing() () from /usr/lib/libkdeinit4_kwin.so
#12 0x00007f3cf9b06afd in KWin::Workspace::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkdeinit4_kwin.so
#13 0x00007f3cf6139d9f in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#14 0x00007f3cf613735e in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#15 0x00007f3cf5301854 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#16 0x00007f3cf530593a in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#17 0x00007f3cf9369146 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#18 0x00007f3cf6125d3c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#19 0x00007f3cf61511d2 in ?? () from /usr/lib/libQtCore.so.4
#20 0x00007f3cf6151310 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#21 0x00007f3cf53a1ea2 in ?? () from /usr/lib/libQtGui.so.4
#22 0x00007f3cf6125122 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#23 0x00007f3cf612535c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#24 0x00007f3cf612976b in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#25 0x00007f3cf9b21118 in kdemain () from /usr/lib/libkdeinit4_kwin.so
#26 0x00007f3cf9794c4d in __libc_start_main () from /lib/libc.so.6
#27 0x00000000004005c9 in _start ()