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>E.124. Release 8.2.21</A
></H1
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><P
><B
>Release date: </B
>2011-04-18</P
></DIV
><P
>   This release contains a variety of fixes from 8.2.20.
   For information about new features in the 8.2 major release, see
   <A
HREF="release-8-2.html"
>Section E.145</A
>.
  </P
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><A
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>E.124.1. Migration to Version 8.2.21</A
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>    A dump/restore is not required for those running 8.2.X.
    However, if you are upgrading from a version earlier than 8.2.14,
    see <A
HREF="release-8-2-14.html"
>Section E.131</A
>.
   </P
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>E.124.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
>      Avoid potential deadlock during catalog cache initialization
      (Nikhil Sontakke)
     </P
><P
>      In some cases the cache loading code would acquire share lock on a
      system index before locking the index's catalog.  This could deadlock
      against processes trying to acquire exclusive locks in the other,
      more standard order.
     </P
></LI
><LI
><P
>      Fix dangling-pointer problem in <TT
CLASS="LITERAL"
>BEFORE ROW UPDATE</TT
> trigger
      handling when there was a concurrent update to the target tuple
      (Tom Lane)
     </P
><P
>      This bug has been observed to result in intermittent <SPAN
CLASS="QUOTE"
>"cannot
      extract system attribute from virtual tuple"</SPAN
> failures while trying to
      do <TT
CLASS="LITERAL"
>UPDATE RETURNING ctid</TT
>.  There is a very small probability
      of more serious errors, such as generating incorrect index entries for
      the updated tuple.
     </P
></LI
><LI
><P
>      Disallow <TT
CLASS="COMMAND"
>DROP TABLE</TT
> when there are pending deferred trigger
      events for the table (Tom Lane)
     </P
><P
>      Formerly the <TT
CLASS="COMMAND"
>DROP</TT
> would go through, leading to
      <SPAN
CLASS="QUOTE"
>"could not open relation with OID nnn"</SPAN
> errors when the
      triggers were eventually fired.
     </P
></LI
><LI
><P
>      Fix PL/Python memory leak involving array slices (Daniel Popowich)
     </P
></LI
><LI
><P
>      Fix <SPAN
CLASS="APPLICATION"
>pg_restore</SPAN
> to cope with long lines (over 1KB) in
      TOC files (Tom Lane)
     </P
></LI
><LI
><P
>      Put in more safeguards against crashing due to division-by-zero
      with overly enthusiastic compiler optimization (Aurelien Jarno)
     </P
></LI
><LI
><P
>      Support use of dlopen() in FreeBSD and OpenBSD on MIPS (Tom Lane)
     </P
><P
>      There was a hard-wired assumption that this system function was not
      available on MIPS hardware on these systems.  Use a compile-time test
      instead, since more recent versions have it.
     </P
></LI
><LI
><P
>      Fix compilation failures on HP-UX (Heikki Linnakangas)
     </P
></LI
><LI
><P
>      Fix path separator used by <SPAN
CLASS="APPLICATION"
>pg_regress</SPAN
> on Cygwin
      (Andrew Dunstan)
     </P
></LI
><LI
><P
>      Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2011f
      for DST law changes in Chile, Cuba, Falkland Islands, Morocco, Samoa,
      and Turkey; also historical corrections for South Australia, Alaska,
      and Hawaii.
     </P
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