REGRESSION: [ macOS Debug wk2 ] webgl/2.0.0/conformance/glsl/misc/shader-uniform-packing-restrictions.html is constantly timing out.

• Component: WebGL
• Status: NEW ---

[Robert Jenner]

webgl/2.0.0/conformance/glsl/misc/shader-uniform-packing-restrictions.html

is constantly timing out on macOS Debug wk. 

HISTORY:
https://results.webkit.org/?suite=layout-tests&test=webgl%2F2.0.0%2Fconformance%2Fglsl%2Fmisc%2Fshader-uniform-packing-restrictions.html

TIMEOUT TEXT:
--- /Volumes/Data/worker/bigsur-debug-tests-wk2/build/layout-test-results/webgl/2.0.0/conformance/glsl/misc/shader-uniform-packing-restrictions-expected.txt
+++ /Volumes/Data/worker/bigsur-debug-tests-wk2/build/layout-test-results/webgl/2.0.0/conformance/glsl/misc/shader-uniform-packing-restrictions-actual.txt
@@ -1,4 +1,5 @@
-This test runs the WebGL Test listed below in an iframe and reports PASS or FAIL.
+#PID UNRESPONSIVE - WebKitTestRunner (pid 5786)
+FAIL: Timed out waiting for notifyDone to be called
 
-Test: ../../../resources/webgl_test_files/conformance/glsl/misc/shader-uniform-packing-restrictions.html
-[ PASS ] All tests passed
+#EOF
+#EOF

[Radar WebKit Bug Importer]

<rdar://problem/76299178>

[Robert Jenner]

I have reproduced the timeouts at BigSur Debug ToT using the following test:

run-webkit-tests webgl/2.0.0/conformance/glsl/misc/shader-uniform-packing-restrictions.html --debug --child-process=1

I'm currently working on bisecting and verifying a regression point.

[Robert Jenner]

I believe r275088 is the change that caused the timeouts:
https://trac.webkit.org/changeset/275088/webkit

Will follow up tomorrow morning.

[Robert Jenner]

I was able to reproduce the timeout in r275088, but not in r275087.