[Bug 111385] [SKL/Iris] GPU hang in (multi-context) SynMark HDRBloom

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111385

            Bug ID: 111385
           Summary: [SKL/Iris] GPU hang in (multi-context) SynMark
                    HDRBloom
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/Iris
          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 145037
  --> https://bugs.freedesktop.org/attachment.cgi?id=145037&action=edit
i915 error state for GPU hang

Setup:
- SKL i5 6600K
- Ubuntu 16.04
- drm-tip git kernel (0330b51e91)
- Mesa git (5ed4e31c08d)
- Unity desktop

Test-case:
- 3x fullscreen FullHD HDRBloom multi-context SynMark test-case:
  synmark2 OglHdrBloom

Actual outcome:
- Recoverable GPU hang, but all successive GL tests fail after that:
  i915 0000:00:02.0: GPU HANG: ecode 9:1:0x00000000, hang on rcs0

Main difference from this test to most other tests is only few tests use
multiple contexts.

I haven't seen such hangs with the i965 driver.

I wasn't able to reproduce the hang after reboot when re-running HDRBloom 10
times, so it may depend on previous tests, or is just very hard to reproduce.

I didn't see such hang when running similar test-sets month ago, so it can be a
regression.

On BXT there was a hang in a different test-case.

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