js/ShadowRealm-importValue.html This test is a flaky/consistent timeout on macOS wk1 release builds. HISTORY: https://results.webkit.org/?suite=layout-tests&test=js%2FShadowRealm-importValue.html&platform=mac&style=release&flavor=wk1 TEXT DIFF: -CONSOLE MESSAGE: 42 -CONSOLE MESSAGE: 100 +FAIL: Timed out waiting for notifyDone to be called Test to ensure correct behaviour of ShadowRealm.prototype.importValue On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". -shadowRealm: calling nested realm wrapper uses correct global: OK -shadowRealm: nested realm eval uses correct global: OK -PASS can import module in a shadow realm -PASS can nest realms - DIFF URL: https://build.webkit.org/results/Apple-Ventura-Release-WK1-Tests/268448@main%20(4216)/js/ShadowRealm-importValue-pretty-diff.html REPRODUCIBILITY: I was able to reproduce this issue on macOS Ventura (13.5, 22G74/arm64) ToT using the following command: run-webkit-tests -1 --clobber-old-results --verbose --iterations 100 --exit-after-n-failures 1 js/ShadowRealm-importValue.html REGRESSION: I was able to identify a potential regression point at 267947@main. As I don't have access to a reliable testing environment, I can't bisect to be sure; however, changes at this point seem directly related to the issue and the first timeout instance is only a few commits later at 267955@main.