Bug 237559 – [ iOS Debug ] fast/canvas/webgl/index-validation-with-resized-buffer.html is a flaky failure

• Status: RESOLVED
• Resolution: FIXED
• Component: WebGL

[Dawn Morningstar]

fast/canvas/webgl/index-validation-with-resized-buffer.html
Is a flaky failure on iOS Debug queues.

Failure appears to originate around r289703 but further investigation is needed to identify regression point.

HISTORY:
https://results.webkit.org/?suite=layout-tests&test=fast%2Fcanvas%2Fwebgl%2Findex-validation-with-resized-buffer.html&platform=ios

DIFF:
--- /Volumes/Data/worker/ios-simulator-15-debug-tests-wk2/build/layout-test-results/fast/canvas/webgl/index-validation-with-resized-buffer-expected.txt
+++ /Volumes/Data/worker/ios-simulator-15-debug-tests-wk2/build/layout-test-results/fast/canvas/webgl/index-validation-with-resized-buffer-actual.txt
@@ -1,16 +1,16 @@
+CONSOLE MESSAGE: WebGL: INVALID_VALUE: shaderSource: attempt to use a deleted program or shader
+CONSOLE MESSAGE: WebGL: INVALID_VALUE: compileShader: attempt to use a deleted program or shader
+CONSOLE MESSAGE: WebGL: INVALID_VALUE: getShaderParameter: attempt to use a deleted program or shader
+CONSOLE MESSAGE: WebGL: INVALID_VALUE: getShaderInfoLog: attempt to use a deleted program or shader
+CONSOLE MESSAGE: *** Error compiling shader '[object WebGLShader]':null
+CONSOLE MESSAGE: TypeError: null is not an object (evaluating 'gl.NO_ERROR')
 Test that updating the size of a vertex buffer is properly noticed by the WebGL implementation.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
-PASS getError was expected value: NO_ERROR : after initialization
-PASS getError was expected value: NO_ERROR : after vertex setup
-PASS getError was expected value: NO_ERROR : after texture coord setup
-PASS getError was expected value: NO_ERROR : after vertex redefinition
-PASS getError was expected value: NO_ERROR : after texture coordinate / color redefinition
-PASS getError was expected value: NO_ERROR : after setting up indices
-PASS getError was expected value: NO_ERROR : after drawing
-
-PASS successfullyParsed is true
+*** Error compiling shader '[object WebGLShader]':null
+FAIL successfullyParsed should be true. Was false.
+Some tests failed.
 
 TEST COMPLETE
 
DIFF-URL:
https://build.webkit.org/results/Apple-iOS-15-Simulator-Debug-WK2-Tests/r290888%20(1860)/fast/canvas/webgl/index-validation-with-resized-buffer-diff.txt

[Radar WebKit Bug Importer]

<rdar://problem/89931080>

[Kenneth Russell]

Could these failures stem from the GPU process crashing unexpectedly?

[Dawn Morningstar]

(In reply to Kenneth Russell from comment #2)
> Could these failures stem from the GPU process crashing unexpectedly?

They look as if they could've been tangentially related to https://bugs.webkit.org/show_bug.cgi?id=237372 as after that fix, these appear to no longer be failing.

[Kenneth Russell]

Thanks for the info - interesting, but good that these are probably not real failures.

[Dawn Morningstar]

Failure appears resolved as of 3/7/22