PostgreSQL 8.4.17 Documentation
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# E.27. Release 8.3.15

> Release Date: 2011-04-18

This release contains a variety of fixes from 8.3.14. For information about new features in the 8.3 major release, see Section E.42.

## E.27.1. Migration to Version 8.3.15

A dump/restore is not required for those running 8.3.X. However, if you are upgrading from a version earlier than 8.3.8, see the release notes for 8.3.8.

## E.27.2. Changes

- Disallow including a composite type in itself (Tom Lane)

  This prevents scenarios wherein the server could recurse infinitely while processing the composite type. While there are some possible uses for such a structure, they don't seem compelling enough to justify the effort required to make sure it always works safely.

- Avoid potential deadlock during catalog cache initialization (Nikhil Sontakke)

  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.

- Fix dangling-pointer problem in `BEFORE ROW UPDATE` trigger handling when there was a concurrent update to the target tuple (Tom Lane)

  This bug has been observed to result in intermittent "cannot extract system attribute from virtual tuple" failures while trying to do `UPDATE RETURNING ctid`. There is a very small probability of more serious errors, such as generating incorrect index entries for the updated tuple.

- Disallow `DROP TABLE` when there are pending deferred trigger events for the table (Tom Lane)

  Formerly the `DROP` would go through, leading to "could not open relation with OID nnn" errors when the triggers were eventually fired.

- Fix PL/Python memory leak involving array slices (Daniel Popowich)

- Fix pg_restore to cope with long lines (over 1KB) in TOC files (Tom Lane)

- Put in more safeguards against crashing due to division-by-zero with overly enthusiastic compiler optimization (Aurelien Jarno)

- Support use of dlopen() in FreeBSD and OpenBSD on MIPS (Tom Lane)

  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.

- Fix compilation failures on HP-UX (Heikki Linnakangas)

- Fix version-incompatibility problem with libintl on Windows (Hiroshi Inoue)

- Fix usage of xcopy in Windows build scripts to work correctly under Windows 7 (Andrew Dunstan)

  This affects the build scripts only, not installation or usage.

- Fix path separator used by pg_regress on Cygwin (Andrew Dunstan)

- Update time zone data files to tzdata release 2011f for DST law changes in Chile, Cuba, Falkland Islands, Morocco, Samoa, and Turkey; also historical corrections for South Australia, Alaska, and Hawaii.

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