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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [ivb blorp?] GPU hang in witcher.EXE"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91730#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [ivb blorp?] GPU hang in witcher.EXE"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91730">bug 91730</a>
from <span class="vcard"><a class="email" href="mailto:mattst88@gmail.com" title="Matt Turner <mattst88@gmail.com>"> <span class="fn">Matt Turner</span></a>
</span></b>
<pre>(In reply to Pavel Ondračka from <a href="show_bug.cgi?id=91730#c1">comment #1</a>)
<span class="quote">> I can reproduce a similar behavior in Total War: Shogun2.
> GPU hangs and "intel_do_flush_locked failed: Input/output error" is printed
> in the terminal. Hopefully it is the same bug, however for me this is 100%
> reproducible.</span >
Why do you believe it's the same bug? Are Shogun2 and Witcher based on the same
engine or something?
<span class="quote">> I've managed to bisect it to:
> commit f5cf74d8ba8ce30b9d53b2198e5122ed72f1dcff
> Author: Matt Turner <<a href="mailto:mattst88@gmail.com">mattst88@gmail.com</a>>
> Date: Tue May 5 20:25:07 2015 -0700
>
> nir: Recognize (a < c || b < c) as min(a, b) < c.
>
> ... and (a >= c) || (b >= c) as max(a, b) >= c.
>
> Similar to commit 97e6c1b9.
>
> total instructions in shared programs: 6182276 -> 6182180 (-0.00%)
> instructions in affected programs: 6400 -> 6304 (-1.50%)
> helped: 68
> HURT: 4
>
> Reviewed-by: Jordan Justen <<a href="mailto:jordan.l.justen@intel.com">jordan.l.justen@intel.com</a>>
> Reviewed-by: Glenn Kennard <<a href="mailto:glenn.kennard@gmail.com">glenn.kennard@gmail.com</a>>
>
> Tim can you confirm this with your testcases?
>
> It can be reproduced with this trace: <a href="http://pavel.ondracka.cz/Shogun2.trace">http://pavel.ondracka.cz/Shogun2.trace</a></span >
I couldn't get a hang by running this trace on Haswell, but I did confirm that
3 of the shaders were affected (hurt, actually...) by the patch you bisected
the problem to.
I'll see if I can get someone to run the trace on BDW, and I'll look more
closely at the differences in the shaders to see if we're doing something
suspicious.</pre>
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