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In rare circumstances involving relfilenode reuse, it might have been possible for smgr_targblock to finish up pointing past the end. Oversight in b74e94dc. Back-patch to 15. Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi> Discussion: https://postgr.es/m/CA%2BhUKGJ8NTvqLHz6dqbQnt2c8XCki4r2QvXjBQcXpVwxTY_pvA%40mail.gmail.com