Fix bug in startup of Hot Standby when a master transaction has many
      subtransactions (Andres Freund)
     </P
><P
>      This mistake led to failures reported as <SPAN
CLASS="QUOTE"
>"out-of-order XID
      insertion in KnownAssignedXids"</SPAN
>.
     </P
></LI
><LI
><P
>      Ensure the <TT
CLASS="FILENAME"
>backup_label</TT
> file is fsync'd after
      <CODE
CLASS="FUNCTION"
>pg_start_backup()</CODE
> (Dave Kerr)
     </P
></LI
><LI
><P
>      Fix timeout handling in walsender processes (Tom Lane)