KWin from KDE 4.7.0 crashes when trying to use GL ES.

Radeon HD4870, kernel 3.0.0, radeon driver with KMS, libdrm Git master, Mesa Git master with Gallium3D (r600g), xf86-video-ati Git master, X.Org server 1.10.3.

Backtrace:

#6  0x00007f9efdd934d3 in native_create_display (dpy=<value optimized out>,
use_sw=<value optimized out>) at drm/native_drm.c:316
#7  0x00007f9efdd92907 in egl_g3d_initialize (drv=0x2706250, dpy=0x2720cf0) at
common/egl_g3d.c:519
#8  0x000000300be0b17f in _eglMatchAndInitialize (dpy=0x2720cf0) at
egldriver.c:608
#9  0x000000300be0b4c3 in _eglMatchDriver (dpy=0x2720cf0, test_only=0) at
egldriver.c:639
#10 0x000000300be06272 in eglInitialize (dpy=0x2720cf0, major=0x0, minor=0x0)
at eglapi.c:323
#11 0x00007f9efecbc2bc in KWin::CompositingPrefs::initEGLContext
(this=0x1fb82a0) at
/var/tmp/portage/kde-base/kwin-4.7.0/work/kwin-4.7.0/kwin/compositingprefs.cpp:293
#12 0x00007f9efecbc8a8 in KWin::CompositingPrefs::detect (this=0x1fb82a0) at
/var/tmp/portage/kde-base/kwin-4.7.0/work/kwin-4.7.0/kwin/compositingprefs.cpp:166
#13 0x00007f9efecb0026 in KWin::KWinCompositingConfig::updateStatusUI
(this=0x1fb8010, compositingIsPossible=<value optimized out>) at
/var/tmp/portage/kde-base/kwin-4.7.0/work/kwin-4.7.0/kwin/kcmkwin/kwincompositing/main.cpp:415
#14 0x00007f9efecb318b in KWin::KWinCompositingConfig::load (this=0x1fb8010) at
/var/tmp/portage/kde-base/kwin-4.7.0/work/kwin-4.7.0/kwin/kcmkwin/kwincompositing/main.cpp:433
#15 0x00007f9efecaf57e in KWin::KWinCompositingConfig::rearmGlSupport
(this=0x1fb8010) at
/var/tmp/portage/kde-base/kwin-4.7.0/work/kwin-4.7.0/kwin/kcmkwin/kwincompositing/main.cpp:347
#16 0x00007f9efecb40a8 in KWin::KWinCompositingConfig::qt_metacall
(this=0x1fb8010, _c=QMetaObject::InvokeMetaMethod, _id=15, _a=0x7fff025c2d10)
at
/var/tmp/portage/kde-base/kwin-4.7.0/work/kwin-4.7.0_build/kwin/kcmkwin/kwincompositing/main.moc:165
#17 0x0000003005b70537 in QMetaObject::activate(QObject*, QMetaObject const*,
int, void**) () from /usr/lib64/qt4/libQtCore.so.4
#18 0x000000300d9fe722 in QAbstractButton::clicked(bool) () from
/usr/lib64/qt4/libQtGui.so.4
#19 0x000000300d74a40b in ?? () from /usr/lib64/qt4/libQtGui.so.4
#20 0x000000300d74b9cb in ?? () from /usr/lib64/qt4/libQtGui.so.4
#21 0x000000300d74bc3c in QAbstractButton::mouseReleaseEvent(QMouseEvent*) ()
from /usr/lib64/qt4/libQtGui.so.4
#22 0x000000300d40673b in QWidget::event(QEvent*) () from
/usr/lib64/qt4/libQtGui.so.4
#23 0x000000300d3b4e64 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /usr/lib64/qt4/libQtGui.so.4
#24 0x000000300d3ba452 in QApplication::notify(QObject*, QEvent*) () from
/usr/lib64/qt4/libQtGui.so.4
#25 0x0000003015448a86 in KApplication::notify (this=0x7fff025c4370,
receiver=0x1e88920, event=0x7fff025c3810) at
/var/tmp/portage/kde-base/kdelibs-4.7.0/work/kdelibs-4.7.0/kdeui/kernel/kapplication.cpp:311
#26 0x0000003005b5be5b in QCoreApplication::notifyInternal(QObject*, QEvent*)
() from /usr/lib64/qt4/libQtCore.so.4
#27 0x000000300d3b5e75 in QApplicationPrivate::sendMouseEvent(QWidget*,
QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from
/usr/lib64/qt4/libQtGui.so.4
#28 0x000000300d434948 in ?? () from /usr/lib64/qt4/libQtGui.so.4
#29 0x000000300d433009 in QApplication::x11ProcessEvent(_XEvent*) () from
/usr/lib64/qt4/libQtGui.so.4
#30 0x000000300d45a402 in ?? () from /usr/lib64/qt4/libQtGui.so.4
#31 0x00000030036426ae in g_main_context_dispatch () from
/usr/lib64/libglib-2.0.so.0
#32 0x0000003003642e98 in ?? () from /usr/lib64/libglib-2.0.so.0
#33 0x000000300364312d in g_main_context_iteration () from
/usr/lib64/libglib-2.0.so.0
#34 0x0000003005b86d3f in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /usr/lib64/qt4/libQtCore.so.4
#35 0x000000300d45a0ae in ?? () from /usr/lib64/qt4/libQtGui.so.4
#36 0x0000003005b5b222 in
QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib64/qt4/libQtCore.so.4
#37 0x0000003005b5b464 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib64/qt4/libQtCore.so.4
#38 0x0000003005b5f8cb in QCoreApplication::exec() () from
/usr/lib64/qt4/libQtCore.so.4
#39 0x0000000000411289 in _start ()