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>Appendix E. Release Notes</TD
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><H1
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><A
NAME="RELEASE-9-2-9"
>E.16. Release 9.2.9</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2014-07-24</P
></DIV
><P
>   This release contains a variety of fixes from 9.2.8.
   For information about new features in the 9.2 major release, see
   <A
HREF="release-9-2.html"
>Section E.25</A
>.
  </P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN112889"
>E.16.1. Migration to Version 9.2.9</A
></H2
><P
>    A dump/restore is not required for those running 9.2.X.
   </P
><P
>    However, this release corrects an index corruption problem in some GiST
    indexes.  See the first changelog entry below to find out whether your
    installation has been affected and what steps you should take if so.
   </P
><P
>    Also, if you are upgrading from a version earlier than 9.2.6,
    see <A
HREF="release-9-2-6.html"
>Section E.19</A
>.
   </P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN112895"
>E.16.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
>      Correctly initialize padding bytes in <TT
CLASS="FILENAME"
>contrib/btree_gist</TT
>
      indexes on <TT
CLASS="TYPE"
>bit</TT
> columns (Heikki Linnakangas)
     </P
><P
>      This error could result in incorrect query results due to values that
      should compare equal not being seen as equal.
      Users with GiST indexes on <TT
CLASS="TYPE"
>bit</TT
> or <TT
CLASS="TYPE"
>bit varying</TT
>
      columns should <TT
CLASS="COMMAND"
>REINDEX</TT
> those indexes after installing this
      update.
     </P
></LI
><LI
><P
>      Protect against torn pages when deleting GIN list pages (Heikki
      Linnakangas)
     </P
><P
>      This fix prevents possible index corruption if a system crash occurs
      while the page update is being written to disk.
     </P
></LI
><LI
><P
>      Don't clear the right-link of a GiST index page while replaying
      updates from WAL (Heikki Linnakangas)
     </P
><P
>      This error could lead to transiently wrong answers from GiST index
      scans performed in Hot Standby.
     </P
></LI
><LI
><P
>      Fix corner-case infinite loop during insertion into an SP-GiST text
      index (Tom Lane)
     </P
></LI
><LI
><P
>      Fix feedback status when <A
HREF="runtime-config-replication.html#GUC-HOT-STANDBY-FEEDBACK"
>hot_standby_feedback</A
> is
      turned off on-the-fly (Simon Riggs)
     </P
></LI
><LI
><P
>      Fix possibly-incorrect cache invalidation during nested calls
      to <CODE
CLASS="FUNCTION"
>ReceiveSharedInvalidMessages</CODE
> (Andres Freund)
     </P
></LI
><LI
><P
>      Fix planner's mishandling of nested PlaceHolderVars generated in
      nested-nestloop plans (Tom Lane)
     </P
><P
>      This oversight could result in <SPAN
CLASS="QUOTE"
>"variable not found in subplan
      target lists"</SPAN
> errors, or in silently wrong query results.
     </P
></LI
><LI
><P
>      Fix <SPAN
CLASS="QUOTE"
>"could not find pathkey item to sort"</SPAN
> planner failures
      with <TT
CLASS="LITERAL"
>UNION ALL</TT
> over subqueries reading from tables with
      inheritance children (Tom Lane)
     </P
></LI
><LI
><P
>      Don't assume a subquery's output is unique if there's a set-returning
      function in its targetlist (David Rowley)
     </P
><P
>      This oversight could lead to misoptimization of constructs
      like <TT
CLASS="LITERAL"
>WHERE x IN (SELECT y, generate_series(1,10) FROM t GROUP
      BY y)</TT
>.
     </P
></LI
><LI
><P
>      Improve planner to drop constant-NULL inputs
      of <TT
CLASS="LITERAL"
>AND</TT
>/<TT
CLASS="LITERAL"
>OR</TT
> when possible (Tom Lane)
     </P
><P
>      This change fixes some cases where the more aggressive parameter
      substitution done by 9.2 and later can lead to a worse plan than
      older versions produced.
     </P
></LI
><LI
><P
>      Fix identification of input type category in <CODE
CLASS="FUNCTION"
>to_json()</CODE
>
      and friends (Tom Lane)
     </P
><P
>      This is known to have led to inadequate quoting of <TT
CLASS="TYPE"
>money</TT
>
      fields in the <TT
CLASS="TYPE"
>JSON</TT
> result, and there may have been wrong
      results for other data types as well.
     </P
></LI
><LI
><P
>      Fix failure to detoast fields in composite elements of structured
      types (Tom Lane)
     </P
><P
>      This corrects cases where TOAST pointers could be copied into other
      tables without being dereferenced.  If the original data is later
      deleted, it would lead to errors like <SPAN
CLASS="QUOTE"
>"missing chunk number 0
      for toast value ..."</SPAN
> when the now-dangling pointer is used.
     </P
></LI
><LI
><P
>      Fix <SPAN
CLASS="QUOTE"
>"record type has not been registered"</SPAN
> failures with
      whole-row references to the output of Append plan nodes (Tom Lane)
     </P
></LI
><LI
><P
>      Fix possible crash when invoking a user-defined function while
      rewinding a cursor (Tom Lane)
     </P
></LI
><LI
><P
>      Fix query-lifespan memory leak while evaluating the arguments for a
      function in <TT
CLASS="LITERAL"
>FROM</TT
> (Tom Lane)
     </P
></LI
><LI
><P
>      Fix session-lifespan memory leaks in regular-expression processing
      (Tom Lane, Arthur O'Dwyer, Greg Stark)
     </P
></LI
><LI
><P
>      Fix data encoding error in <TT
CLASS="FILENAME"
>hungarian.stop</TT
> (Tom Lane)
     </P
></LI
><LI
><P
>      Prevent foreign tables from being created with OIDS
      when <A
HREF="runtime-config-compatible.html#GUC-DEFAULT-WITH-OIDS"
>default_with_oids</A
> is true
      (Etsuro Fujita)
     </P
></LI
><LI
><P
>      Fix liveness checks for rows that were inserted in the current
      transaction and then deleted by a now-rolled-back subtransaction
      (Andres Freund)
     </P
><P
>      This could cause problems (at least spurious warnings, and at worst an
      infinite loop) if <TT
CLASS="COMMAND"
>CREATE INDEX</TT
> or <TT
CLASS="COMMAND"
>CLUSTER</TT
> were
      done later in the same transaction.
     </P
></LI
><LI
><P
>      Clear <TT
CLASS="STRUCTNAME"
>pg_stat_activity</TT
>.<TT
CLASS="STRUCTFIELD"
>xact_start</TT
>
      during <TT
CLASS="COMMAND"
>PREPARE TRANSACTION</TT
> (Andres Freund)
     </P
><P
>      After the <TT
CLASS="COMMAND"
>PREPARE</TT
>, the originating session is no longer in
      a transaction, so it should not continue to display a transaction
      start time.
     </P
></LI
><LI
><P
>      Fix <TT
CLASS="COMMAND"
>REASSIGN OWNED</TT
> to not fail for text search objects
      (&Aacute;lvaro Herrera)
     </P
></LI
><LI
><P
>      Block signals during postmaster startup (Tom Lane)
     </P
><P
>      This ensures that the postmaster will properly clean up after itself
      if, for example, it receives <SPAN
CLASS="SYSTEMITEM"
>SIGINT</SPAN
> while still
      starting up.
     </P
></LI
><LI
><P
>      Fix client host name lookup when processing <TT
CLASS="FILENAME"
>pg_hba.conf</TT
>
      entries that specify host names instead of IP addresses (Tom Lane)
     </P
><P
>      Ensure that reverse-DNS lookup failures are reported, instead of just
      silently not matching such entries.  Also ensure that we make only
      one reverse-DNS lookup attempt per connection, not one per host name
      entry, which is what previously happened if the lookup attempts failed.
     </P
></LI
><LI
><P
>      Allow the root user to use <TT
CLASS="LITERAL"
>postgres -C variable</TT
> and
      <TT
CLASS="LITERAL"
>postgres --describe-config</TT
> (MauMau)
     </P
><P
>      The prohibition on starting the server as root does not need to extend
      to these operations, and relaxing it prevents failure
      of <SPAN
CLASS="APPLICATION"
>pg_ctl</SPAN
> in some scenarios.
     </P
></LI
><LI
><P
>      Secure Unix-domain sockets of temporary postmasters started during
      <TT
CLASS="LITERAL"
>make check</TT
> (Noah Misch)
     </P
><P
>      Any local user able to access the socket file could connect as the
      server's bootstrap superuser, then proceed to execute arbitrary code as
      the operating-system user running the test, as we previously noted in
      CVE-2014-0067.  This change defends against that risk by placing the
      server's socket in a temporary, mode 0700 subdirectory
      of <TT
CLASS="FILENAME"
>/tmp</TT
>.  The hazard remains however on platforms where
      Unix sockets are not supported, notably Windows, because then the
      temporary postmaster must accept local TCP connections.
     </P
><P
>      A useful side effect of this change is to simplify
      <TT
CLASS="LITERAL"
>make check</TT
> testing in builds that
      override <TT
CLASS="LITERAL"
>DEFAULT_PGSOCKET_DIR</TT
>.  Popular non-default values
      like <TT
CLASS="FILENAME"
>/var/run/postgresql</TT
> are often not writable by the
      build user, requiring workarounds that will no longer be necessary.
     </P
></LI
><LI
><P
>      Fix tablespace creation WAL replay to work on Windows (MauMau)
     </P
></LI
><LI
><P
>      Fix detection of socket creation failures on Windows (Bruce Momjian)
     </P
></LI
><LI
><P
>      On Windows, allow new sessions to absorb values of PGC_BACKEND
      parameters (such as <A
HREF="runtime-config-logging.html#GUC-LOG-CONNECTIONS"
>log_connections</A
>) from the
      configuration file (Amit Kapila)
     </P
><P
>      Previously, if such a parameter were changed in the file post-startup,
      the change would have no effect.
     </P
></LI
><LI
><P
>      Properly quote executable path names on Windows (Nikhil Deshpande)
     </P
><P
>      This oversight could cause <SPAN
CLASS="APPLICATION"
>initdb</SPAN
>
      and <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> to fail on Windows, if the installation
      path contained both spaces and <TT
CLASS="LITERAL"
>@</TT
> signs.
     </P
></LI
><LI
><P
>      Fix linking of <SPAN
CLASS="APPLICATION"
>libpython</SPAN
> on macOS (Tom Lane)
     </P
><P
>      The method we previously used can fail with the Python library
      supplied by Xcode 5.0 and later.
     </P
></LI
><LI
><P
>      Avoid buffer bloat in <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> when the server
      consistently sends data faster than the client can absorb it
      (Shin-ichi Morita, Tom Lane)
     </P
><P
>      <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> could be coerced into enlarging its input buffer
      until it runs out of memory (which would be reported misleadingly
      as <SPAN
CLASS="QUOTE"
>"lost synchronization with server"</SPAN
>).  Under ordinary
      circumstances it's quite far-fetched that data could be continuously
      transmitted more quickly than the <CODE
CLASS="FUNCTION"
>recv()</CODE
> loop can
      absorb it, but this has been observed when the client is artificially
      slowed by scheduler constraints.
     </P
></LI
><LI
><P
>      Ensure that LDAP lookup attempts in <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> time out as
      intended (Laurenz Albe)
     </P
></LI
><LI
><P
>      Fix <SPAN
CLASS="APPLICATION"
>ecpg</SPAN
> to do the right thing when an array
      of <TT
CLASS="TYPE"
>char *</TT
> is the target for a FETCH statement returning more
      than one row, as well as some other array-handling fixes
      (Ashutosh Bapat)
     </P
></LI
><LI
><P
>      Fix <SPAN
CLASS="APPLICATION"
>pg_restore</SPAN
>'s processing of old-style large object
      comments (Tom Lane)
     </P
><P
>      A direct-to-database restore from an archive file generated by a
      pre-9.0 version of <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> would usually fail if the
      archive contained more than a few comments for large objects.
     </P
></LI
><LI
><P
>      Fix <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> for cases where the new server creates
      a TOAST table but the old version did not (Bruce Momjian)
     </P
><P
>      This rare situation would manifest as <SPAN
CLASS="QUOTE"
>"relation OID mismatch"</SPAN
>
      errors.
     </P
></LI
><LI
><P
>      Prevent <TT
CLASS="FILENAME"
>contrib/auto_explain</TT
> from changing the output of
      a user's <TT
CLASS="COMMAND"
>EXPLAIN</TT
> (Tom Lane)
     </P
><P
>      If <TT
CLASS="FILENAME"
>auto_explain</TT
> is active, it could cause
      an <TT
CLASS="LITERAL"
>EXPLAIN (ANALYZE, TIMING OFF)</TT
> command to nonetheless
      print timing information.
     </P
></LI
><LI
><P
>      Fix query-lifespan memory leak in <TT
CLASS="FILENAME"
>contrib/dblink</TT
>
      (MauMau, Joe Conway)
     </P
></LI
><LI
><P
>      In <TT
CLASS="FILENAME"
>contrib/pgcrypto</TT
> functions, ensure sensitive
      information is cleared from stack variables before returning
      (Marko Kreen)
     </P
></LI
><LI
><P
>      Prevent use of already-freed memory in
      <TT
CLASS="FILENAME"
>contrib/pgstattuple</TT
>'s <CODE
CLASS="FUNCTION"
>pgstat_heap()</CODE
>
      (Noah Misch)
     </P
></LI
><LI
><P
>      In <TT
CLASS="FILENAME"
>contrib/uuid-ossp</TT
>, cache the state of the OSSP UUID
      library across calls (Tom Lane)
     </P
><P
>      This improves the efficiency of UUID generation and reduces the amount
      of entropy drawn from <TT
CLASS="FILENAME"
>/dev/urandom</TT
>, on platforms that
      have that.
     </P
></LI
><LI
><P
>      Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2014e
      for DST law changes in Crimea, Egypt, and Morocco.
     </P
></LI
></UL
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