[Webkit-unassigned] [Bug 55728] New: [fileapi] Worker File API calls that create Blobs fail in debug builds due to random number generator thread assertion

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=55728

           Summary: [fileapi] Worker File API calls that create Blobs fail
                    in debug builds due to random number generator thread
                    assertion
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: adamk at chromium.org
                CC: fishd at chromium.org, michaeln at google.com,
                    kinuko at chromium.org, ericu at chromium.org


File API calls like FileEntry.file() fail when run in Worker threads due to an ASSERT(isMainThread()) in WTF::ARC4RandomNumberGenerator::randomNumber(), which is called by the UUID code utilized by BlobURL.

It's not clear to me whether the fix is to enable JSC_MULTIPLE_THREADS (which would wrap accesses in a Mutex) or to use a different RNG.

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