[Bug 108820] [SKL] GPU hangs in all benchmarks using compute shaders with drm-tip v4.19 kernel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108820

            Bug ID: 108820
           Summary: [SKL] GPU hangs in all benchmarks using compute
                    shaders with drm-tip v4.19 kernel
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Keywords: regression
          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

Setup:
* SKL GT2 / GT3e
* Ubuntu 18.04
* *drm-tip* v4.19 kernel
* Mesa & X git head

Test-case:
* Run a test-case using compute shaders

Expected output:
* No GPU hangs (like with earlier Mesa commits)

Actual output:
* Recoverable GPU hangs in compute shader using test-cases:
  - GfxBench Aztec Ruins, CarChase and Manhattan 3.1
  - Sacha Willems' Vulkan compute demos
  - SynMark CSDof / CSCloth
* Vulkan compute demos fail to run (other tests run successfully despite hangs)

This seems to be SKL specific, it's not visible on other HW.

This regression happened between following Mesa commits:
* dca35c598d: 2018-11-19 15:57:41: intel/fs,vec4: Fix a compiler warning
* a999798daa: 2018-11-20 17:09:22: meson: Add tests to suites

It also seems to be specific to *drm-tip* v4.19.0 kernel as I don't see it with
latest drm-tip v4.20.0-rc3 kernel.  So it's also possible that it's a bug in
i915, that just gets triggered by Mesa change, and which got fixed later.


Sacha Willems' Vulkan Raytracing demo outputs following on first run:
---------------------------------
SPIR-V WARNING:
    In file src/compiler/spirv/vtn_variables.c:1897
    Source and destination types of SpvOpStore do not have the same ID (but are
compatible): 225 vs 212
    14920 bytes into the SPIR-V binary
SPIR-V WARNING:
    In file src/compiler/spirv/vtn_variables.c:1897
    Source and destination types of SpvOpStore do not have the same ID (but are
compatible): 225 vs 212
    10300 bytes into the SPIR-V binary
SPIR-V WARNING:
    In file src/compiler/spirv/vtn_variables.c:1897
    Source and destination types of SpvOpStore do not have the same ID (but are
compatible): 269 vs 256
    10944 bytes into the SPIR-V binary
SPIR-V WARNING:
    In file src/compiler/spirv/vtn_variables.c:1897
    Source and destination types of SpvOpStore do not have the same ID (but are
compatible): 225 vs 212
    11920 bytes into the SPIR-V binary
INTEL-MESA: error: src/intel/vulkan/anv_device.c:2091: GPU hung on one of our
command buffers (VK_ERROR_DEVICE_LOST)
vulkan_raytracing: base/vulkanexamplebase.cpp:651: void
VulkanExampleBase::submitFrame(): Assertion `res == VK_SUCCESS' failed.
-----------------------------

(Other runs show just the error and assert.)

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