315398 2026-05-22 17:17:48 -0700 REGRESSION(312765@main): [macOS Release] http/tests/site-isolation/accessibility/client/simple-iframe.html is a constant TIMEOUT 2026-05-22 17:28:13 -0700 1 1 1 Unclassified WebKit WebKit Misc. WebKit Nightly Build Unspecified Unspecified NEW InRadar P2 Normal --- 1 rackler tyler_w webkit-bot-watchers-bugzilla webkit-bug-importer oldest_to_newest 2213421 0 rackler 2026-05-22 17:17:48 -0700 Description: http/tests/site-isolation/accessibility/client/simple-iframe.html is a constant TIMEOUT on mac macOS Release Regression = https://commits.webkit.org/compare/312763@main...312766@main 312765@main AXIsolatedTree is exactly the cross-process AX tree used when a child iframe is in a different process. "Skip work when no changes are pending" is the way to break a notify-done contract — if a "no changes pending" branch is hit at the wrong moment, the parent never gets the AX update from the iframe and notifyDone is never called. This issue can be bisected to 312765@main using the command: run-webkit-tests --no-build --no-retry --no-show-results --exit-after-n-failures=1 --expect-pass --iterations=5 --force --release http/tests/site-isolation/accessibility/client/simple-iframe.html ------------- BISECTION AUDIT TRAIL ------------- 312490@main, 0f4e435819e7 --> Passed 312639@main, 41568db3548f --> Passed 312705@main, a930513ff6bb --> Passed 312757@main, 9c272d7dbe94 --> Passed 312760@main, e013a1f98e85 --> Passed 312763@main, 82e8e98e3f73 --> Passed 312766@main, 82e8e98e3f73 --> TIMEOUT (matches) [bot os version: 25E200, 25E260] 312767@main, 82e8e98e3f73 --> TIMEOUT (matches) [bot os version: 25E200, 25E260] 312768@main, 82e8e98e3f73 --> TIMEOUT (matches) [bot os version: 25E260] 312787@main, 1f804ec554e3 --> TIMEOUT (matches) [bot os version: 25E260] 312808@main, 2301d3a6e99a --> TIMEOUT (matches) [bot os version: 25E260] 313066@main, 903aebfeea77 --> TIMEOUT (matches) [bot os version: 25E260] 313697@main, 7d41f6f65e00 --> TIMEOUT [bot os version: 25E200, 25E260] 313699@main, bb6cd1b1508d --> TIMEOUT [bot os version: 25E260] 313738@main, fe511c676864 --> TIMEOUT (matches, 6/6) [bot os version: 25E260] 313738@main, fe511c676864 --> TIMEOUT (matches, 6/6) [bot os version: 25E260] ------------- BISECTION AUDIT TRAIL END ------------- History: https://results.webkit.org/?version_name=Tahoe&suite=layout-tests&test=http%2Ftests%2Fsite-isolation%2Faccessibility%2Fclient%2Fsimple-iframe.html Diff: --- +++ @@ -1,11 +1,4 @@ -Dump accessibility tree with isolated iframe -AXRole: AXWebArea - AXRole: AXButton Before - AXRole: AXWebArea - AXRole: AXHeading Hello, world! - AXRole: AXButton After +CONSOLE MESSAGE: Unhandled Promise Rejection: Timed out +FAIL: Timed out waiting for notifyDone to be called -PASS successfullyParsed is true - -TEST COMPLETE Before After Test Run: https://build.webkit.org/#/builders/1716/builds/4106 08:24:57.753 23313 [26830/91997] http/tests/site-isolation/accessibility/client/simple-iframe.html failed unexpectedly (test timed out, text diff) 08:24:57.861 23313 worker/10 http/tests/site-isolation/accessibility/client/simple-iframe.html failed: 2213422 1 webkit-bug-importer 2026-05-22 17:17:56 -0700 <rdar://problem/177751156> 2213423 2 ews-feeder 2026-05-22 17:28:13 -0700 Test gardening commit 313767@main (b1c6b4bda27f): <https://commits.webkit.org/313767@main> Reviewed commits have been landed. Closing PR #65514 and removing active labels.