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e7caacf733
As mentioned in its commit message, eca0f1db left open a race condition,
where a page could be marked all-visible, after the code checked
PageIsAllVisible() to pin the VM, but before the page is locked. Plug
that hole.
Reviewed-By: Robert Haas, Andres Freund
Author: Amit Kapila
Discussion: CAEepm=3fWAbWryVW9swHyLTY4sXVf0xbLvXqOwUoDiNCx9mBjQ@mail.gmail.com
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