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Lack of these checks could cause visible misbehavior, including assertion failures. This was missed in commit c6550776394e, whereby restart_lsn becomes invalid when the size limit is exceeded. Also reword some existing error messages, and add errdetail(), so that the reported errors all match in spirit. Author: Kyotaro Horiguchi <horikyota.ntt@gmail.com> Reviewed-by: Álvaro Herrera <alvherre@alvh.no-ip.org> Discussion: https://postgr.es/m/20200408.093710.447591748588426656.horikyota.ntt@gmail.com