[Bug 111424] New: Random recoverable GPU hangs in trivial GpuTest Triangle test

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111424

            Bug ID: 111424
           Summary: Random recoverable GPU hangs in trivial GpuTest
                    Triangle test
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: eero.t.tamminen at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 145093
  --> https://bugs.freedesktop.org/attachment.cgi?id=145093&action=edit
SKL GT4e hang, with drm-tip git from few days ago and fullscreen Triangle
benchmark

Setup:
* HW: SKL GT2, SKL GT4e
* Display: FullHD
* kernel: drm-tip git v5.2 and git from few days ago
* OS: Ubuntu 18.04
* Desktop: lightdm/Unity/compiz
* Test: GpuTest v0.7 (latest)

Use-case:
* Trivial windowed/composited use-case (SKL GT2 hang, with drm-tip v5.2):
  GpuTest /test=triangle /width=1366 /height=768 /msaa=1 /no_scorebox
/benchmark /benchmark_duration_ms=35000
* Trivial fullscreen use-case (SKL GT4e hang, with drm-tip git from few days
ago):
  GpuTest /test=triangle /width=1920 /height=1080 /fullscreen /msaa=1
/no_scorebox /benchmark /benchmark_duration_ms=35000

Expected output:
* No hangs

Actual output:
* (Recoverable) GPU hang.

Notes:
* Hang is rare
* Test-case is trivial 3D one, and therefore very high FPS.  It does a (fast)
clear, draws a 1/2 window sized triangle (benchmark's framework draws also a
small bar for progress and blits penguin image to indicate Linux, but those are
so small they don't impact perf)
* Due to simplicity of the benchmark and its resulting high FPS, this looks
like race-condition, in kernel I think

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