[Bug 108787] [BSW] Mesa "total_needs <= urb_chunks" abort in GfxBench CarChase startup

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108787

            Bug ID: 108787
           Summary: [BSW] Mesa "total_needs <= urb_chunks" abort in
                    GfxBench CarChase startup
           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

Setup:
* BSW N3050
* Ubuntu 18.04
* Gfx stack built from Git
* GfxBench v4 / v5 (reproduced with latter, but v4 should work the same)

Use-case:
* bin/testfw_app --gfx glfw --gl_api desktop_core --width 1920 --height 1080
--fullscreen 1 --test_id gl_4

Actual outcome:
* Abort with following message:
testfw_app: src/intel/common/gen_urb_config.c:152: gen_get_urb_config:
Assertion `total_needs <= urb_chunks' failed.

This regressed between following Mesa commits:
41c8f99137: 2018-11-12 18:28:04: util: Fix warning in u_cpu_detect on non-x86
e13dd70581: 2018-11-14 14:41:58: i965: avoid 'unused variable' warnings

In case it matters:
* i965 has always misrendered Carchase benchmark on BSW, see bug 101406
* GfxBench Vulkan Aztec Ruins and SynMark DeferredAA & TexMem128 started
  to GPU hang around 6th of November, but for now this seems more of
  a drm-tip kernel than Mesa issue

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