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passed extend = true whenever we are reading a page we intend to reinitialize completely, even if we think the page "should exist". This is because it might indeed not exist, if the relation got truncated sometime after the current xlog record was made and before the crash we're trying to recover from. These two thinkos appear to explain both of the old bug reports discussed here: http://archives.postgresql.org/pgsql-hackers/2005-05/msg01369.php