[Bug 93257] [SKL, bisected] ASTC dEQP tests segfault

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93257

--- Comment #1 from Neil Roberts <neil at linux.intel.com> ---
It looks like this is a bug with GL_KHR_surfaceless_context which deqp is using
when the target is DRM. With this extension the read and draw surfaces can be
NULL. When glViewport is called the i965 driver tries to invalidate these two
surfaces so it crashes on the NULL pointer.

Ben's patch makes it hit this bug because glViewport is called when restoring
the saved meta state after doing a fast clear. The saved meta state is using
the window system draw buffer which in this case will be NULL.

I've made a patch for this here:

http://patchwork.freedesktop.org/patch/67357/

And a piglit test case here:

http://patchwork.freedesktop.org/patch/67356/

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