Comment # 6 on bug 78669 from David Heidelberger (okias)

try with -O3, then it's permanently

PIGLIT: {'result': 'fail' }

I tried:
while true; do
/home/okias/projects/piglit/bin/gl-3.2-layered-rendering-clear-color-all-types
3d single_level -fbo -auto | grep result; done

and always fail