301206 2025-10-21 11:57:12 -0700 [ Tahoe ] 2x TestIPC.IPCSerialization.* (api-tests) are constant failures 2025-11-08 12:18:13 -0800 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified NEW InRadar P2 Normal --- 301588 1 Morningstar jenner jbedard jenner simon.lewis webkit-bot-watchers-bugzilla webkit-bug-importer oldest_to_newest 2153060 0 Morningstar 2025-10-21 11:57:12 -0700 TestIPC.IPCSerialization.AVOutputContext TestIPC.IPCSerialization.SecureCoding Are both failing on Tahoe, these were not failing previously and are not failing internally. History: https://results.webkit.org/?suite=api-tests&suite=api-tests&test=TestIPC.IPCSerialization.SecureCoding&test=TestIPC.IPCSerialization.AVOutputContext Test-run: https://build.webkit-uat.org/#/builders/1716/builds/25 STDIO: https://s3-us-west-2.amazonaws.com/archives.webkit-uat.org/mac-tahoe-x86_64%20arm64-debug-run-api-tests/301721@main-17.txt FAILURE: "TestIPC.IPCSerialization.AVOutputContext", "2025-10-17 15:21:27.190 TestIPC[65531:5490673] NSEventConcurrentProcessingEnabled=NO\n\n/Volumes/Data/worker/Apple-Tahoe-Debug-Build/build/Tools/TestWebKitAPI/Tests/IPC/IPCSerialization.mm:668\nValue of: bObject != nullptr\n Actual: false\nExpected: true\n\n\n\n/Volumes/Data/worker/Apple-Tahoe-Debug-Build/build/Tools/TestWebKitAPI/Tests/IPC/IPCSerialization.mm:928\nValue of: holder == result\n Actual: false\nExpected: true" "TestIPC.IPCSerialization.SecureCoding", "2025-10-17 15:21:28.870 TestIPC[65692:5491718] NSEventConcurrentProcessingEnabled=NO\n\n/Volumes/Data/worker/Apple-Tahoe-Debug-Build/build/Tools/TestWebKitAPI/Tests/IPC/IPCSerialization.mm:668\nValue of: bObject != nullptr\n Actual: false\nExpected: true\n\n\n\n/Volumes/Data/worker/Apple-Tahoe-Debug-Build/build/Tools/TestWebKitAPI/Tests/IPC/IPCSerialization.mm:928\nValue of: holder == result\n Actual: false\nExpected: true" 2153061 1 webkit-bug-importer 2025-10-21 11:58:54 -0700 <rdar://problem/163132998> 2155319 2 jenner 2025-10-30 13:39:55 -0700 These failures are occurring on Tahoe Release, and Debug. Also, API-Tests are not WK1/WK2 deterministic. Removing from title. 2155325 3 jenner 2025-10-30 13:51:43 -0700 Pull request: https://github.com/WebKit/WebKit/pull/53215 2157343 4 jbedard 2025-11-07 13:44:18 -0800 Simon fixed TestIPC.IPCSerialization.SecureCoding, but not TestIPC.IPCSerialization.AVOutputContext. 2157462 5 simon.lewis 2025-11-08 12:18:13 -0800 PR to fix AVOutputContext test failure is here: https://github.com/WebKit/WebKit/pull/53618