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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - GLSL disk cache: blob format changes may cause segfaults etc."
href="https://bugs.freedesktop.org/show_bug.cgi?id=107096">107096</a>
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<th>Summary</th>
<td>GLSL disk cache: blob format changes may cause segfaults etc.
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>glsl-compiler
</td>
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>bugspam@moreofthesa.me.uk
</td>
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
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<p>
<div>
<pre>Test case: “Deus Ex: Mankind Divided”. GPU is RX 470.
This was working fine with Mesa 18.1.1 installed but stopped working (symptom
was a strcmp() segfaulting due to one parameter being NULL) with 18.1.3
installed. I tested 18.1.2; that worked fine. (This game crashes on first run
after installing a different version of Mesa, but I'm not concerned with that
here.)
Clearing Steam's shader cache for this game and running with 18.1.3 works fine
(and the new cache content would, I expect, cause problems with 18.1.2 and
earlier).
I went looking for patches which messed with cache content and reverted one
which adds more data; with the original cached shaders, 18.1.3 suddenly started
working without problems.
The commit which I reverted is 915d9166bf4c “glsl: serialize data from
glTransformFeedbackVaryings”, which is commit ab2643e4b06f in master. I suspect
that 99c6cae22780 “glsl/cache: save and restore ExternalSamplersUsed” and other
such patches will cause similar breakage.
Changes to the on-disk shader cache format should cause a cache version bump.
This doesn't seem to be happening…</pre>
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