[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

            Bug ID: 94924
           Summary: [GEN8+] Ungine Valley fails to run due to
                    "intel_do_flush_locked failed: Input/output error"
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: eero.t.tamminen at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Ungine Valley fails to run due to "intel_do_flush_locked failed: Input/output
error" with latest Mesa.

This started to happen on BDW/BSW/SKL ~31st of March, but it doesn't happen on
IVB/HSW/BYT,

Automated bisecting on BDW & SKL gave the same commit as trigger to this:
---------------------------------------------------------
commit b4e223cfbf4d46e2ca4c7313f4ebd52798d21551
Author: Matt Turner <mattst88 at gmail.com>
Date:   Mon Feb 15 10:43:39 2016 -0800

    i965: Remove NOP insertion kludge in scheduler.

    Instead of removing every instruction in add_insts_from_block(), just
    move the instruction to its scheduled location. This is a step towards
    doing both bottom-up and top-down scheduling without conflicts.

    Note that this patch changes cycle counts for programs because it begins
    including control flow instructions in the estimates.

    Reviewed-by: Francisco Jerez <currojerez at riseup.net>
---------------------------------------------------------

This happens both on:
- Ubuntu 15.10 with DRI3 + latest 4.6-rc kernel & latest X, and
- Ubuntu 16.04 with DRI2 + Ubuntu kernel (i.e. 4.4 + 4.6 i915 forklift) & X

(There have been similar issues with SynMark Multithread test, but those aren't
100% reproducible like this.)

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