[Webkit-unassigned] [Bug 205662] New: REGRESSION (r253926): webgl/2.0.0/conformance2/renderbuffers/multisampled-renderbuffer-initialization.html is flaky

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205662

            Bug ID: 205662
           Summary: REGRESSION (r253926):
                    webgl/2.0.0/conformance2/renderbuffers/multisampled-re
                    nderbuffer-initialization.html is flaky
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ap at webkit.org
                CC: dino at apple.com, kbr at google.com,
                    webkit-bug-importer at group.apple.com

webgl/2.0.0/conformance2/renderbuffers/multisampled-renderbuffer-initialization.html became a flaky failure on all Mac bots after switching to ANGLE.

https://results.webkit.org/?suite=layout-tests&test=webgl%2F2.0.0%2Fconformance2%2Frenderbuffers%2Fmultisampled-renderbuffer-initialization.html

FWIW, the story seems to be more subtle on internal bots, some of which saw the test flake in different ways prior to the switch, but it's a 100% clear regression in open source.

@@ -49,7 +49,7 @@
 [ 46: PASS ] gl.checkFramebufferStatus(gl.FRAMEBUFFER) is gl.FRAMEBUFFER_COMPLETE
 [ 47: PASS ] getError was expected value: NO_ERROR : should be no errors
 [ 48: PASS ] getError was expected value: NO_ERROR : should be no errors
-[ 49: PASS ] user buffer has been initialized to 0
+[ 49: FAIL ] user buffer has been initialized to 0 at (8, 0) expected: 0,0,0,0 was 255,255,255,255
 [ 50: PASS ] getError was expected value: NO_ERROR : should be no errors
 [ 51: PASS ] internal buffers have been initialized to 0
 [ 52: PASS ] getError was expected value: NO_ERROR : should be no error after framebufferRenderbuffer.
@@ -112,7 +112,7 @@
 [ 109: PASS ] gl.checkFramebufferStatus(gl.FRAMEBUFFER) is gl.FRAMEBUFFER_COMPLETE
 [ 110: PASS ] getError was expected value: NO_ERROR : should be no errors
 [ 111: PASS ] getError was expected value: NO_ERROR : should be no errors
-[ 112: PASS ] user buffer has been initialized to 0
+[ 112: FAIL ] user buffer has been initialized to 0 at (8, 0) expected: 0,0,0,0 was 255,255,255,255
 [ 113: PASS ] getError was expected value: NO_ERROR : should be no errors
 [ 114: PASS ] internal buffers have been initialized to 0
 [ 115: PASS ] getError was expected value: NO_ERROR : should be no error after framebufferRenderbuffer.
@@ -130,5 +130,5 @@
 [ 127: PASS ] clearColor is [0, 1, 0, 1]
 [ 128: PASS ] getError was expected value: NO_ERROR : should be no errors
 [ 129: PASS ] successfullyParsed is true
-[ FAIL ] 8 failures reported
+[ FAIL ] 10 failures reported

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