[Bug 96743] [BYT] GPU hangs with GfxBench 4.0 CarChase

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96743

            Bug ID: 96743
           Summary: [BYT] GPU hangs with GfxBench 4.0 CarChase
           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
        Depends on: 96291

Setup:
- BYT N2820
- Ubuntu 16.04
- GfxBench v4: https://gfxbench.com/linux-download/
- Mesa from few days ago
- drm-nightly kernel from same day as Mesa

Use-case:
- Start GfxBench
- Run Car Chase test few times

Expected outcome:
- No hangs

Actual outcome:
- On some runs, multiple recovered GPU hangs in dmesg
------------
[drm] GPU HANG: ecode 7:0:0x87f77c3e, in testfw_app [10406], reason: Engine(s)
hung, action: reset
[drm] GPU HANG: ecode 7:0:0x8ff8ffff, in testfw_app [10406], reason: Engine(s)
hung, action: reset
[drm] GPU HANG: ecode 7:0:0x87f7edfe, in testfw_app [10406], reason: Engine(s)
hung, action: reset
[drm] GPU HANG: ecode 7:0:0x85fffffc, in testfw_app [10406], reason: Engine(s)
hung, action: reset
------------

Unlike with bug 96291, this doesn't necessarily happen on every run.

I've seen GPU hangs with this test also on HSW GT3e and BXT-P, but there
they're rarer.  As they don't happen everytime, I'm not sure whether this is
Mesa issue (haven't got test machine myself, these are from automated run
logs).


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=96291
[Bug 96291] [BDW/SKL] GPU hangs with programs using compute shaders
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