[Bug 78770] New: [SNB Regression]Webglc conformance/textures/texture-size-limit.html fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78770

          Priority: high
            Bug ID: 78770
          Assignee: idr at freedesktop.org
           Summary: [SNB Regression]Webglc
                    conformance/textures/texture-size-limit.html fails
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: major
    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: Sandybridge
Libdrm:       
(master)libdrm-2.4.54-8-g305478ce02ebd908a75c9830ecea15f6e2469b42
Mesa:        (master)670418740fc763f0272b799ea999cd3ff69b1218
Xserver:   
(master)xorg-server-1.15.99.902-91-g01e18af17f8dc91451fbd0902049045afd1cea7e
Xf86_video_intel:(master)2.99.911-166-g0625185f4772f1c7f8e8d7f265432fd77cdd27fc
Libva:        (staging)968ade9411de9c5ae2eead0a7e8755747a32a3a2
Libva_intel_driver:(staging)1c4d3468229797e787f4b99b0729baf90a115a1d
Kernel:    (drm-intel-nightly) c74cad3c2599b47438b168ca5629fbb00ab63f95

Bug detailed description:
---------------------------
It fails on Sandybridge with Mesa master branch and 10.2 branch,it works well
on 10.1 branch.

The latest known good commit: 8c4a9f631d7438aeaf56785401891d0773792123
The latest known bad commit: 670418740fc763f0272b799ea999cd3ff69b1218
I will bisect it later.

Reproduce steps:
----------------------------
1. xinit
2. go to
https://www.khronos.org/registry/webgl/conformance-suites/1.0.2/webgl-conformance-tests.html
run conformance/textures/texture-size-limit.html

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