Bug 177215

Summary:	[JSC] JSTests/stress/ftl-put-by-id-slow-exception-no-catch.js is failing due to incorrect IC
Product:	WebKit	Reporter:	Caio Lima <ticaiolima>
Component:	JavaScriptCore	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED INVALID
Severity:	Normal	CC:	fpizlo, keith_miller, mark.lam, saam, ticaiolima, ysuzuki
Priority:	P2
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Caio Lima

Reported 2017-09-19 18:41:26 PDT

The problem is happening when an Inline Cache is created using a Structure that is collected by GC and a further Structure with a different shape is allocated at the same address. In that case, the IC code is invalid, but the Structure comparison will succeed and then the wrong offset is being used. Steps to reproduce: ```run-jsc --count 500 JSTests/stress/ftl-put-by-id-slow-exception-no-catch.js```

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Caio Lima

Comment 1 2017-09-22 11:57:47 PDT

False alarm. The reason is a downstream Patch.

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