235880 2022-01-31 01:51:25 -0800 WeakRef deref can return null instead of undefined 2022-02-04 23:27:04 -0800 1 1 1 Unclassified WebKit JavaScriptCore Safari 15 Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 stef.busking ysuzuki ashvayka bfulgham ews-watchlist fpizlo keith_miller mark.lam msaboff saam sam tzagallo webkit-bug-importer ysuzuki oldest_to_newest 1835460 0 stef.busking 2022-01-31 01:51:25 -0800 Seen in Safari 15.1, 15.2 (macOS) and Epiphany 41.3 (Linux) According to the ECMAScript specification (https://tc39.es/ecma262/multipage/managing-memory.html#sec-weakrefderef), a WeakRef's deref method should either return the referenced object or `undefined`. This behaves as expected in Chrome, Firefox and Edge, but it seems that in WebKit browsers this method may return `null` instead. I've confirmed this behavior using the following in the dev tools console: ``` a = new WeakRef(new ArrayBuffer(10000000)) // wait a while to allow GC to clean up the ArrayBuffer a.deref() ``` I'm not sure if Webkit browsers have a way to force garbage collection, but waiting a while or using other tabs seems to work for triggering this issue most of the time. Firefox allows forcing GC on about:memory, Chrome and Edge provide a button for this on the Memory tab of their dev tools. Expected behavior: a.deref() returns undefined (happens in Chrome, Firefox and Edge) Actual behavior: a.deref() returns null in Safari and Epiphany 1837636 1 webkit-bug-importer 2022-02-04 16:18:02 -0800 <rdar://problem/88513359> 1837662 2 450955 ysuzuki 2022-02-04 17:04:46 -0800 Created attachment 450955 Patch 1837663 3 450956 ysuzuki 2022-02-04 17:14:24 -0800 Created attachment 450956 Patch 1837665 4 450956 ashvayka 2022-02-04 17:26:52 -0800 Comment on attachment 450956 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=450956&action=review > Source/JavaScriptCore/ChangeLog:8 > + WeakRef#deref should return undefined when a wrapped object is collected. nit: a spec link perhaps? https://tc39.es/ecma262/#sec-weakrefderef 1837666 5 ysuzuki 2022-02-04 17:27:18 -0800 Thanks Sam and Alexey! 1837672 6 450956 ysuzuki 2022-02-04 18:00:33 -0800 Comment on attachment 450956 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=450956&action=review >> Source/JavaScriptCore/ChangeLog:8 >> + WeakRef#deref should return undefined when a wrapped object is collected. > > nit: a spec link perhaps? https://tc39.es/ecma262/#sec-weakrefderef Nice, done. 1837719 7 ysuzuki 2022-02-04 23:27:04 -0800 Committed r289152 (246848@trunk): <https://commits.webkit.org/246848@trunk> 450955 2022-02-04 17:04:46 -0800 2022-02-04 17:14:22 -0800 Patch bug-235880-20220204170446.patch text/plain 2759 ysuzuki U3VidmVyc2lvbiBSZXZpc2lvbjogMjg5MTQyCmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCBh NTg2ZWVjYjYwODZlYzQ2MDAwZTkyMzdmMDgwNzAxYzQ2OWVhNDY1Li5iNTM4N2QwMjEwNmQ5NzBh NDFmMmMxMjJlMDQ5MzBlY2ZiMzNlMzk2IDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwxNSBAQAorMjAyMi0wMi0wNCAgWXVzdWtlIFN1enVraSAgPHlzdXp1a2lAYXBwbGUuY29t PgorCisgICAgICAgIFdlYWtSZWYgZGVyZWYgY2FuIHJldHVybiBudWxsIGluc3RlYWQgb2YgdW5k 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