[Bug 94924] [GEN8+] Ungine Valley fails to run due to "intel_do_flush_locked failed: Input/output error"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94924

--- Comment #6 from Matt Turner <mattst88 at gmail.com> ---
Created attachment 123035
  --> https://bugs.freedesktop.org/attachment.cgi?id=123035&action=edit
debugging patch

I can't reproduce on Haswell, so my hypothesis is that it's a problem in the
SIMD8 vertex shader (which is BDW+).

I've diff'd the BDW vertex shaders before and after the commit Mark bisected it
to, but I don't see anything that looks wrong.

Attached is a debugging patch I used to verify some invariants (programs end
with EOT, blocks that start/end with control flow continue to do so after
scheduling). It didn't demonstrate any problems with the Unigine Valley shaders
in shader-db.

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