172575 2017-05-24 20:35:52 -0700 Properties set on window.customElements can disappear due to GC 2018-08-06 16:30:22 -0700 1 1 1 Unclassified WebKit DOM Safari 10 Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 154907 188353 1 bicknellr rniwa cdumez darin dbates esprehn+autocc ews-watchlist fpizlo fred.wang kangil.han kondapallykalyan mark.lam rniwa saam sam tsavell webkit-bug-importer ysuzuki oldest_to_newest 1312511 0 bicknellr 2017-05-24 20:35:52 -0700 Occasionally, properties that are set on window.customElements very early in the lifetime of the page are removed by garbage collection. To repro, put the attached files in the same directory and open 'index.html'. You may need to adjust the number of objects created in 'test.html' to balance the repro rate with the time per run. You can also trigger this (at a reduced rate) by putting an external script that spins for 10-20ms between the write / read instead of creating objects. This seems to affect 10, TP, and Nightly. 1312512 1 311187 bicknellr 2017-05-24 20:36:19 -0700 Created attachment 311187 test.html 1312513 2 311188 bicknellr 2017-05-24 20:36:37 -0700 Created attachment 311188 index.html 1312514 3 311187 bicknellr 2017-05-24 20:38:54 -0700 Comment on attachment 311187 test.html <script> // Uncomment this section to prevent the bug. /* Object.defineProperty(window, 'customElements', { value: window.customElements, }); */ window.customElements.prop = 1234; const a = []; for (let i = 0; i < 1000000; i++) { a.push({}); } const pass = window.customElements.prop === 1234; window.parent.postMessage(pass, '*'); </script> 1312516 4 311189 bicknellr 2017-05-24 20:39:27 -0700 Created attachment 311189 test.html 1312518 5 bicknellr 2017-05-24 20:46:31 -0700 This seems like it's probably related to 171567. 1313388 6 webkit-bug-importer 2017-05-27 00:13:35 -0700 <rdar://problem/32440668> 1313390 7 rniwa 2017-05-27 00:22:43 -0700 (In reply to Russell Bicknell from comment #5) > This seems like it's probably related to 171567. It's not. 1447885 8 346581 rniwa 2018-08-03 21:13:14 -0700 Created attachment 346581 Fixes the bug 1447902 9 rniwa 2018-08-04 02:02:46 -0700 Committed r234578: <https://trac.webkit.org/changeset/234578> 1448000 10 346581 darin 2018-08-05 15:15:04 -0700 Comment on attachment 346581 Fixes the bug View in context: https://bugs.webkit.org/attachment.cgi?id=346581&action=review > Source/WebCore/dom/CustomElementRegistry.idl:29 > EnabledAtRuntime=CustomElements, > - ImplementationLacksVTable, > JSGenerateToNativeObject, > + GenerateIsReachable=ImplScriptExecutionContext We’ve been sorting these alphabetically and putting commas on every line. So this should be a line higher and have a comma. 1448022 11 rniwa 2018-08-05 17:45:14 -0700 Sure. Fixed it in r234585. 1448140 12 tsavell 2018-08-06 09:38:20 -0700 Looks like the new test fast/custom-elements/custom-element-registry-wrapper-should-stay-alive.html is a constant timeout on all debug platforms. Test History: https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Fcustom-elements%2Fcustom-element-registry-wrapper-should-stay-alive.html 1448149 13 rniwa 2018-08-06 10:20:41 -0700 Yeah, noticed. Will look into it today. 1448219 14 rniwa 2018-08-06 13:30:26 -0700 The test failure is tracked by https://bugs.webkit.org/show_bug.cgi?id=188353. 311187 2017-05-24 20:36:19 -0700 2017-05-24 20:38:54 -0700 test.html test.html text/html 908 bicknellr PGh0bWw+CjxoZWFkPgo8c2NyaXB0Pgp3aW5kb3cuYWRkRXZlbnRMaXN0ZW5lcignbG9hZCcsIGZ1 bmN0aW9uKCkgewogIGNvbnN0IG91dHB1dCA9IGRvY3VtZW50LmdldEVsZW1lbnRCeUlkKCdvdXRw dXQnKTsKICBjb25zdCBmcmFtZSA9IGRvY3VtZW50LmdldEVsZW1lbnRCeUlkKCdmcmFtZScpOwoK ICBmdW5jdGlvbiB0ZXN0KGZyYW1lKSB7CiAgICByZXR1cm4gbmV3IFByb21pc2UoKHJlc29sdmUs IHJlamVjdCkgPT4gewogICAgICB3aW5kb3cuYWRkRXZlbnRMaXN0ZW5lcignbWVzc2FnZScsIGZ1 bmN0aW9uIG9uTWVzc2FnZShlKSB7CiAgICAgICAgaWYgKGUuc291cmNlICE9PSBmcmFtZS5jb250 ZW50V2luZG93KSByZXR1cm47CiAgICAgICAgd2luZG93LnJlbW92ZUV2ZW50TGlzdGVuZXIoJ21l c3NhZ2UnLCBvbk1lc3NhZ2UpOwogICAgICAgIHJlc29sdmUoZS5kYXRhKTsKICAgICAgfSk7CiAg ICAgIGZyYW1lLnNyYyA9ICcuL3Rlc3QuaHRtbCc7CiAgICB9KTsKICB9CgogIGxldCBwYXNzQ291 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