[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

--- Comment #5 from Rhys Kidd <rhyskidd at gmail.com> ---
I attempted to recreate this with spilling on ILK with a more recent Mesa. As
Iago outlined with the minimal reproducer test, the shader_test didn't hang but
it did fail with INTEL_DEBUG=spill_vec4.

$ INTEL_DEBUG=spill_vec4 mesa-debug bin/shader_runner
vs-ilk-spill-fail.shader_test -auto 
Probe color at (0,0)
  Expected: 0 255 0 255
  Observed: 0 0 0 255
PIGLIT: {"result": "fail" }

$ mesa-debug bin/shader_runner vs-ilk-spill-fail.shader_test -auto
PIGLIT: {"result": "pass" }

$ mesa-debug report-bug-info 
Software versions:
    4.4.0-22-generic
    OpenGL version string: 2.1 Mesa 12.1.0-devel (git-f016e4b)

GPU hardware:
    OpenGL renderer string: Mesa DRI Intel(R) Ironlake Mobile 
    00:02.0 VGA compatible controller [0300]: Intel Corporation Core Processor
Integrated Graphics Controller [8086:0046] (rev 02)

CPU hardware:
    x86_64
    Intel(R) Core(TM) i5 CPU       M 580  @ 2.67GHz

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