ScriptLoaderClient* ScriptLoader::client() const
{
    if (isHTMLScriptLoader(m_element))
        return toHTMLScriptElement(m_element);

    if (isSVGScriptLoader(m_element))
        return toSVGScriptElement(m_element);

    ASSERT_NOT_REACHED();
    return 0;
}

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.