[Webkit-unassigned] [Bug 186237] New: FunctionRareData::m_objectAllocationProfileWatchpoint is racy

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186237

            Bug ID: 186237
           Summary: FunctionRareData::m_objectAllocationProfileWatchpoint
                    is racy
           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

We initialize it blind and let it go into auto-watch mode once the DFG adds a watchpoint, but that means that we never notice that it fired if it fires between when the DFG decides to watch it and when it actually adds the watchpoint.

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