[Webkit-unassigned] [Bug 158280] New: Structure::previousID() races with Structure::allocateRareData()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=158280

            Bug ID: 158280
           Summary: Structure::previousID() races with
                    Structure::allocateRareData()
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

It's such an uncommon race, but it's totally devastating: we'll get a RareData pointer but thing it's a Structure.  This passes most assertions - for example it passes cell validation - but later causes crashes in AI.

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