315308 2026-05-21 10:59:08 -0700 [Site Isolation] Several Inspector cross-origin-iframe getResponseBody tests flake on mac-wk2-stress in site-isolation mode 2026-05-21 10:59:14 -0700 1 1 1 Unclassified WebKit Web Inspector WebKit Nightly Build Unspecified Unspecified NEW InRadar P2 Normal --- 308890 1 bburg webkit-unassigned inspector-bugzilla-changes webkit-bug-importer oldest_to_newest 2213028 0 bburg 2026-05-21 10:59:08 -0700 The following 5 layout tests pass on the mac-site-isolation queue but regress (PASS -> TEXT, with stderr) on mac-wk2-stress when run in site-isolation mode under high parallel-worker concurrency: http/tests/inspector/network/cross-origin-iframe-get-response-body-after-navigation.html http/tests/inspector/network/cross-origin-iframe-get-response-body-binary.html http/tests/inspector/network/cross-origin-iframe-get-response-body-document.html http/tests/inspector/network/cross-origin-iframe-get-response-body-error-cases.html http/tests/inspector/network/cross-origin-iframe-get-response-body-subresources.html These tests were added by the BackendResourceDataStore work (webkit.org/b/308890, PR #61172). Failures observed on EWS: https://ews-build.webkit.org/#/builders/8/builds/146763 (#61172) https://ews-build.webkit.org/#/builders/8/builds/146764 (#61177) Marking [ Skip ] in platform/mac-wk2/TestExpectations to unblock landing, following the same pattern as webkit.org/b/315225 (cross-origin-iframe- request-id-uniqueness.html). Investigation needed: stress-mode parallelism likely interacts with BackendResourceDataStore lifecycle / event ordering. Re-enable when the race is understood and addressed. 2213029 1 webkit-bug-importer 2026-05-21 10:59:14 -0700 <rdar://problem/177637309>