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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - glGenFramebuffersEXT appears to be null on (some?) Mesa 12.0.6 systems"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100425">100425</a>
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<th>Summary</th>
<td>glGenFramebuffersEXT appears to be null on (some?) Mesa 12.0.6 systems
</td>
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<th>Product</th>
<td>Mesa
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<th>Version</th>
<td>12.0
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (All)
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>GLX
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
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<th>Reporter</th>
<td>kainino@chromium.org
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
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<pre>Chromium is seeing GPU process crash reports on Linux with Mesa 12.0.6 in which
the function glGenFramebuffersEXT appears to be null. This is seen on Intel
mostly, some NVIDIA and a few AMD.
We have not tried to reproduce it as we don't have such a system on hand
(sorry). It may be reproducible by running Chrome 57.0 Stable (snapshot below)
on a Mesa 12.0.6 system and using WebGL 2.0: <a href="http://webglreport.com/?v=2">http://webglreport.com/?v=2</a> . See
chrome://gpu for GPU process logs.
<a href="https://commondatastorage.googleapis.com/chromium-browser-snapshots/index.html?prefix=Linux_x64/444952/">https://commondatastorage.googleapis.com/chromium-browser-snapshots/index.html?prefix=Linux_x64/444952/</a>
(chrome-linux.zip)
The glGenFramebuffersEXT call in question:
<a href="https://chromium.googlesource.com/chromium/src/+/57.0.2987.110/gpu/command_buffer/service/feature_info.cc#872">https://chromium.googlesource.com/chromium/src/+/57.0.2987.110/gpu/command_buffer/service/feature_info.cc#872</a>
Here is the generated code for retrieving glGenFramebuffersEXT. Note that it
should be requesting "glGenFramebuffers" on GL 3.0+.
<a href="https://cs.chromium.org/chromium/src/ui/gl/gl_bindings_autogen_gl.cc?l=1206&rcl=57.0.2987.110">https://cs.chromium.org/chromium/src/ui/gl/gl_bindings_autogen_gl.cc?l=1206&rcl=57.0.2987.110</a>
GetGLProcAddress calls g_get_proc_address:
<a href="https://cs.chromium.org/chromium/src/ui/gl/gl_implementation.cc?l=126&rcl=57.0.2987.110">https://cs.chromium.org/chromium/src/ui/gl/gl_implementation.cc?l=126&rcl=57.0.2987.110</a>
Which should be glXGetProcAddress on Linux:
<a href="https://cs.chromium.org/chromium/src/ui/gl/init/gl_initializer_x11.cc?l=58&rcl=57.0.2987.110">https://cs.chromium.org/chromium/src/ui/gl/init/gl_initializer_x11.cc?l=58&rcl=57.0.2987.110</a></pre>
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