[Bug 92234] [BDW] GPU hang in Shogun2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92234

            Bug ID: 92234
           Summary: [BDW] GPU hang in Shogun2
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Keywords: bisected, regression
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: pavel.ondracka at email.cz
        QA Contact: intel-3d-bugs at lists.freedesktop.org
                CC: mattst88 at gmail.com

Originally posted in bug 91730, sorry about that...

When starting Total War: Shogun2, GPU hangs, program exits and
"intel_do_flush_locked failed: Input/output error" is printed in the terminal.

I've managed to bisect it to:
commit f5cf74d8ba8ce30b9d53b2198e5122ed72f1dcff
Author: Matt Turner <mattst88 at gmail.com>
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 <jordan.l.justen at intel.com>
    Reviewed-by: Glenn Kennard <glenn.kennard at gmail.com>

It can be reproduced with this trace: http://pavel.ondracka.cz/Shogun2.trace

My system info:
GPU: Mesa DRI Intel(R) HD Graphics 5500 (Broadwell GT2)
Mesa: c0722be9f58ef89dae98d8c459ec4f9589f97748
kernel: 4.1.7-200.fc22.x86_64
libdrm: 94ecdcb8b11dd3eb6b047ad72030d775014aadee
xf86-video-intel: 679ee12079a7d2682d41506b81973c7c7d4fa1d8 (sna+dri3)

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