[Webkit-unassigned] [Bug 169892] New: WebAssembly: WasmMemory::lastAllocatedMemoryMode is racy

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=169892

            Bug ID: 169892
           Summary: WebAssembly: WasmMemory::lastAllocatedMemoryMode is
                    racy
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jfbastien at apple.com
                CC: fpizlo at apple.com, jfbastien at apple.com,
                    keith_miller at apple.com, mark.lam at apple.com,
                    msaboff at apple.com, sbarati at apple.com
            Blocks: 159775

It's a benign race... but you can create two Workers, use wasm, and they clobber the value independently.

I'm not sure TLS is the best thing either. Having the VM may be better?

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