[Bug 90691] [BSW]Piglit/spec/nv_conditional_render/dlist fails intermittently

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90691

            Bug ID: 90691
           Summary: [BSW]Piglit/spec/nv_conditional_render/dlist fails
                    intermittently
           Product: Mesa
           Version: git
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

System Environment:
--------------------------
Platform: BSW
Libdrm:       
(master)libdrm-2.4.61-4-gfde4969176822fe54197b6baa78f8b0ef900baba
Mesa:        (master)2b8c51834bcc34a70dec9b470a28c0ef972d6993
Xserver:   
(master)xorg-server-1.17.0-156-g806470b9f623089dc81b985f250f0c3a4e8edbe8
Xf86_video_intel:(master)2.99.917-312-ga6dd2655cb41000943e554ccea16e5781bcbf012
Libva:        (master)4763db1c2133d4e6b92355938ecb6f23a7767b6b
Libva_intel_driver:(master)4a1c4d21f3428b08ef765d7f7de75b97006514ac
Kernel:   (drm-intel-nightly)5267b96e584de7aa76434cc9fefad61169664c2f

Bug detailed description:
-----------------------------
It intermittently fails on BSW with mesa master and 10.6 branch, fail rate:2/5.
Run 10 cycles on 10.5 branch(commit ea0d1f575c214c09ba3df12644a960e86e031766),
it works well.
spec at nv_conditional_render@vertex_array also has this issue.

output:
root at x-bsw06:/GFX/Test/Piglit/piglit# bin/nv_conditional_render-dlist -auto
libGL: OpenDriver: trying /opt/X11R7/lib/dri/tls/i965_dri.so
libGL: OpenDriver: trying /opt/X11R7/lib/dri/i965_dri.so
libGL: Using DRI2 for screen 0
Probe color at (0,0)
  Expected: 0.000000 1.000000 0.000000 0.000000
  Observed: 1.000000 0.000000 0.000000 0.000000
PIGLIT: {"result": "fail" }
root at x-bsw06:/GFX/Test/Piglit/piglit# bin/nv_conditional_render-dlist -auto
libGL: OpenDriver: trying /opt/X11R7/lib/dri/tls/i965_dri.so
libGL: OpenDriver: trying /opt/X11R7/lib/dri/i965_dri.so
libGL: Using DRI2 for screen 0
PIGLIT: {"result": "pass" }
root at x-bsw06:/GFX/Test/Piglit/piglit# bin/nv_conditional_render-dlist -auto
libGL: OpenDriver: trying /opt/X11R7/lib/dri/tls/i965_dri.so
libGL: OpenDriver: trying /opt/X11R7/lib/dri/i965_dri.so
libGL: Using DRI2 for screen 0
Probe color at (0,0)
  Expected: 0.000000 1.000000 0.000000 0.000000
  Observed: 1.000000 0.000000 0.000000 0.000000
PIGLIT: {"result": "fail" }
root at x-bsw06:/GFX/Test/Piglit/piglit# bin/nv_conditional_render-dlist -auto
libGL: OpenDriver: trying /opt/X11R7/lib/dri/tls/i965_dri.so
libGL: OpenDriver: trying /opt/X11R7/lib/dri/i965_dri.so
libGL: Using DRI2 for screen 0
PIGLIT: {"result": "pass" }
root at x-bsw06:/GFX/Test/Piglit/piglit# bin/nv_conditional_render-dlist -auto
libGL: OpenDriver: trying /opt/X11R7/lib/dri/tls/i965_dri.so
libGL: OpenDriver: trying /opt/X11R7/lib/dri/i965_dri.so
libGL: Using DRI2 for screen 0
PIGLIT: {"result": "pass" }

Reproduce steps:
---------------------------- 
1. xinit
2. bin/nv_conditional_render-dlist -auto

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