[Bug 102286] [GEN8] Unigine 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=102286

            Bug ID: 102286
           Summary: [GEN8] Unigine 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: intel-3d-bugs at lists.freedesktop.org
          Reporter: eero.t.tamminen at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 133592
  --> https://bugs.freedesktop.org/attachment.cgi?id=133592&action=edit
Example i915 error state

Unigine Valley (v1.0) has started to randomly fail on BDW around mid-July Mesa
git:
---------------
ATTENTION: default value of option vblank_mode overridden by environment.
intel_do_flush_locked failed: Input/output error
---------------
[  561.009349] [drm] GPU HANG: ecode 8:0:0x84dffec4, in valley_x64 [2125],
reason: Hang on rcs0, action: reset
---------------

It happens approximately once every 5th run, both on BDW GT2 & GT3, both with
drm-tip kernel, and month older kernel build.

(This is too random to be bisected.)

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