<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - [SKL, bisected] ASTC dEQP tests segfault" href="https://bugs.freedesktop.org/show_bug.cgi?id=93257#c1">Comment # 1</a> on <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - [SKL, bisected] ASTC dEQP tests segfault" href="https://bugs.freedesktop.org/show_bug.cgi?id=93257">bug 93257</a> from <a class="email" href="mailto:neil@linux.intel.com" title="Neil Roberts <neil@linux.intel.com>"> Neil Roberts</a> <pre>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: <a href="http://patchwork.freedesktop.org/patch/67357/">http://patchwork.freedesktop.org/patch/67357/</a> And a piglit test case here: <a href="http://patchwork.freedesktop.org/patch/67356/">http://patchwork.freedesktop.org/patch/67356/</a></pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>