[Bug 92100] [ILK] GPU hang (and multiple fails) in piglit shader tests if spilling is forced in the vec4 backend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92100

            Bug ID: 92100
           Summary: [ILK] GPU hang (and multiple fails) in piglit shader
                    tests if spilling is forced in the vec4 backend
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: itoral at igalia.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Running piglit's shader tests (~14000 tests) while forcing spilling on the vec4
backend (INTEL_DEBUG=spill_vec4) produces at least one GPU hang (for me this
happens consistently around test 10400). Also, I see a lot of tests that stop
passing, even before the GPU hang, which points at something seriously broken.
The FS backend is not affected, even if INTEL_DEBUG=spill_fs is used to force
spilling.

All this is with current master (1614c39a8fc205)

To reproduce:

INTEL_DEBUG=spill_vec4 ./piglit-run.py tests/shader results/shader

I'll see if I can add more info, at least the specific test triggering the
hang.

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