149811 2015-10-05 10:29:13 -0700 Iterator loops over key twice after delete 2015-10-12 20:24:39 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build All Unspecified RESOLVED FIXED InRadar P2 Critical --- 1 timon ysuzuki fpizlo ggaren keith_miller mark.lam msaboff saam timon webkit-bug-importer ysuzuki oldest_to_newest 1130656 0 262446 timon 2015-10-05 10:29:13 -0700 Created attachment 262446 reproducible test case The following code iterates twice over the key "0" in the object cols - despite it only existing in the object once. <html> <head> <script> var f = function() { "use strict"; var cols = {"col":{"title":" ","type":"sys","events":[],"name":0,"id":0,"_i":0}}; var len = 0; var remapcols = ['col']; for (var i = 0; i < remapcols.length; i++) { cols[cols[remapcols[i]].name] = cols[remapcols[i]]; delete cols[remapcols[i]]; } var count = 0; console.group("object:") console.log(cols); console.groupEnd(); console.group("This group should only contain one line"); for (var col2 in cols) { console.log("" + count++ +": Iterating over key: " + col2); } console.groupEnd(); }; f();</script> </head> <body> Check console log, expected output is a single log entry "0: Iterating over key: 0" </body> </html> 1131035 1 webkit-bug-importer 2015-10-06 11:04:08 -0700 <rdar://problem/22993722> 1132228 2 ysuzuki 2015-10-11 06:11:54 -0700 Still investigating. But possible fix is, setting indexedLength = 0; for non-generic JSPropertyNameEnumerator creation case. 1132234 3 262862 ysuzuki 2015-10-11 09:24:34 -0700 Created attachment 262862 Patch 1132235 4 262863 ysuzuki 2015-10-11 09:26:51 -0700 Created attachment 262863 Patch 1132416 5 262863 ggaren 2015-10-12 12:06:56 -0700 Comment on attachment 262863 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=262863&action=review r=me > Source/JavaScriptCore/runtime/JSPropertyNameEnumerator.h:128 > + // So disabling indexed property enumeration phase by setting |indexedLength| to 0. disabling => disable 1132683 6 262863 ysuzuki 2015-10-12 20:23:23 -0700 Comment on attachment 262863 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=262863&action=review >> Source/JavaScriptCore/runtime/JSPropertyNameEnumerator.h:128 >> + // So disabling indexed property enumeration phase by setting |indexedLength| to 0. > > disabling => disable Thanks. Fixed. 1132685 7 ysuzuki 2015-10-12 20:24:39 -0700 Committed r190923: <http://trac.webkit.org/changeset/190923> 262446 2015-10-05 10:29:13 -0700 2015-10-05 10:29:13 -0700 reproducible test case error.html text/html 753 timon PGh0bWw+CjxoZWFkPgo8c2NyaXB0Pgp2YXIgZiA9IGZ1bmN0aW9uKCkgewogICAgInVzZSBzdHJp Y3QiOwogICAgdmFyIGNvbHMgPSB7ImNvbCI6eyJ0aXRsZSI6IiZuYnNwOyIsInR5cGUiOiJzeXMi LCJldmVudHMiOltdLCJuYW1lIjowLCJpZCI6MCwiX2kiOjB9fTsKICAgIHZhciBsZW4gPSAwOwog ICAgdmFyIHJlbWFwY29scyA9IFsnY29sJ107CiAgICBmb3IgKHZhciBpID0gMDsgaSA8IHJlbWFw Y29scy5sZW5ndGg7IGkrKykgewogICAgICAgIGNvbHNbY29sc1tyZW1hcGNvbHNbaV1dLm5hbWVd ID0gY29sc1tyZW1hcGNvbHNbaV1dOwogICAgICAgIGRlbGV0ZSBjb2xzW3JlbWFwY29sc1tpXV07 CiAgICB9CiAgICB2YXIgY291bnQgPSAwOwogICAgY29uc29sZS5ncm91cCgib2JqZWN0OiIpCiAg ICBjb25zb2xlLmxvZyhjb2xzKTsKICAgIGNvbnNvbGUuZ3JvdXBFbmQoKTsKICAgIGNvbnNvbGUu Z3JvdXAoIlRoaXMgZ3JvdXAgc2hvdWxkIG9ubHkgY29udGFpbiBvbmUgbGluZSIpOwogICAgZm9y ICh2YXIgY29sMiBpbiBjb2xzKSB7IGNvbnNvbGUubG9nKCIiICsgY291bnQrKyArIjogSXRlcmF0 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