[Webkit-unassigned] [Bug 246390] New: StreamConnectionBuffer::Header field alignment isn't great enough

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=246390

            Bug ID: 246390
           Summary: StreamConnectionBuffer::Header field alignment isn't
                    great enough
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Process Model
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: heycam at apple.com
                CC: webkit-bug-importer at group.apple.com

StreamConnectionBuffer::Header uses alignas(sizeof(uint64_t[2])) on the second field to place it in a different CPU cache line, but that that's alignas(16). We should be using alignas(64) on x86_64 and alignas(128) on ARM64.

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