[Bug 81857] New: [SNB+]Piglit spec_glsl-1.30_execution_switch_fs-default_last sporadically fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81857

          Priority: medium
            Bug ID: 81857
          Assignee: idr at freedesktop.org
           Summary: [SNB+]Piglit
                    spec_glsl-1.30_execution_switch_fs-default_last
                    sporadically fail
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: Drivers/DRI/i965
           Product: Mesa

System Environment:
--------------------------
Platform: SNB
Libdrm:        (master)libdrm-2.4.55
Mesa:        (master)be8bc588b93286dff6a6c1e8594ec40da50658ff
Xserver:   
(master)xorg-server-1.15.99.902-121-g2f5cf9ff9a0f713b7e038636484c77f113a5f10a
Xf86_video_intel:(master)2.99.914-5-gcac1548a9c48db4707fc3c885b1ea568ae2fbc54
Libva:        (master)3fddb7f937df4e0e15391bd65ae3c7552ea5b3d7
Libva_intel_driver:(master)82d2ed8d7da3619c0ea467c06604f5626fc0b901
Kernel:  (drm-intel-nightly)e967a525207bd40ab446e2f809907039f88e66f3

Bug detailed description:
---------------------------
New case spec_glsl-1.30_execution_switch_fs-default_last sporadically fail on
SNB+ platforms on Mesa master branch. Fail rate: 2/5.
Run 5 cycles on 10.2 branch, It works well.

output:
Probe color at (0,249)
  Expected: 0.000000 0.000000 1.000000 0.000000
  Observed: 0.000000 0.000000 0.000000 0.000000
PIGLIT: {"result": "fail" }


Reproduce steps:
---------------------------- 
1. xinit
2. bin/shader_runner
tests/spec/glsl-1.30/execution/switch/fs-default_last.shader_test -auto

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