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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>E.35. Release 9.5.2</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="prev" href="release-9-5-3.html" title="E.34. Release 9.5.3" /><link rel="next" href="release-9-5-1.html" title="E.36. Release 9.5.1" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">E.35. Release 9.5.2</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="release-9-5-3.html" title="E.34. Release 9.5.3">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="release.html" title="Appendix E. Release Notes">Up</a></td><th width="60%" align="center">Appendix E. Release Notes</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 11.1 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="release-9-5-1.html" title="E.36. Release 9.5.1">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="RELEASE-9-5-2"><div class="titlepage"><div><div><h2 class="title" style="clear: both">E.35. Release 9.5.2</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="sect2"><a href="release-9-5-2.html#id-1.11.6.39.4">E.35.1. Migration to Version 9.5.2</a></span></dt><dt><span class="sect2"><a href="release-9-5-2.html#id-1.11.6.39.5">E.35.2. Changes</a></span></dt></dl></div><p><strong>Release date: </strong>2016-03-31</p><p>
   This release contains a variety of fixes from 9.5.1.
   For information about new features in the 9.5 major release, see
   <a class="xref" href="release-9-5.html" title="E.37. Release 9.5">Section E.37</a>.
  </p><div class="sect2" id="id-1.11.6.39.4"><div class="titlepage"><div><div><h3 class="title">E.35.1. Migration to Version 9.5.2</h3></div></div></div><p>
    A dump/restore is not required for those running 9.5.X.
   </p><p>
    However, you may need to <code class="command">REINDEX</code> some indexes after applying
    the update, as per the first changelog entry below.
   </p></div><div class="sect2" id="id-1.11.6.39.5"><div class="titlepage"><div><div><h3 class="title">E.35.2. Changes</h3></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>
      Disable abbreviated keys for string sorting in non-<code class="literal">C</code>
      locales (Robert Haas)
     </p><p>
      <span class="productname">PostgreSQL</span> 9.5 introduced logic for speeding up
      comparisons of string data types by using the standard C library
      function <code class="function">strxfrm()</code> as a substitute
      for <code class="function">strcoll()</code>.  It now emerges that most versions of
      glibc (Linux's implementation of the C library) have buggy
      implementations of <code class="function">strxfrm()</code> that, in some locales,
      can produce string comparison results that do not
      match <code class="function">strcoll()</code>.  Until this problem can be better
      characterized, disable the optimization in all non-<code class="literal">C</code>
      locales.  (<code class="literal">C</code> locale is safe since it uses
      neither <code class="function">strcoll()</code> nor <code class="function">strxfrm()</code>.)
     </p><p>
      Unfortunately, this problem affects not only sorting but also entry
      ordering in B-tree indexes, which means that B-tree indexes
      on <code class="type">text</code>, <code class="type">varchar</code>, or <code class="type">char</code> columns may now
      be corrupt if they sort according to an affected locale and were
      built or modified under <span class="productname">PostgreSQL</span> 9.5.0 or 9.5.1.
      Users should <code class="command">REINDEX</code> indexes that might be affected.
     </p><p>
      It is not possible at this time to give an exhaustive list of
      known-affected locales.  <code class="literal">C</code> locale is known safe, and
      there is no evidence of trouble in English-based locales such
      as <code class="literal">en_US</code>, but some other popular locales such
      as <code class="literal">de_DE</code> are affected in most glibc versions.
     </p></li><li class="listitem"><p>
      Maintain row-security status properly in cached plans (Stephen Frost)
     </p><p>
      In a session that performs queries as more than one role, the plan
      cache might incorrectly re-use a plan that was generated for another
      role ID, thus possibly applying the wrong set of policies when
      row-level security (RLS) is in use.
      (CVE-2016-2193)
     </p></li><li class="listitem"><p>
      Add must-be-superuser checks to some
      new <code class="filename">contrib/pageinspect</code> functions (Andreas Seltenreich)
     </p><p>
      Most functions in the <code class="filename">pageinspect</code> extension that
      inspect <code class="type">bytea</code> values disallow calls by non-superusers,
      but <code class="function">brin_page_type()</code> and <code class="function">brin_metapage_info()</code>
      failed to do so.  Passing contrived <code class="type">bytea</code> values to them might
      crash the server or disclose a few bytes of server memory.  Add the
      missing permissions checks to prevent misuse.
      (CVE-2016-3065)
     </p></li><li class="listitem"><p>
      Fix incorrect handling of indexed <code class="literal">ROW()</code> comparisons
      (Simon Riggs)
     </p><p>
      Flaws in a minor optimization introduced in 9.5 caused incorrect
      results if the <code class="literal">ROW()</code> comparison matches the index ordering
      partially but not exactly (for example, differing column order, or the
      index contains both <code class="literal">ASC</code> and <code class="literal">DESC</code> columns).
      Pending a better solution, the optimization has been removed.
     </p></li><li class="listitem"><p>
      Fix incorrect handling of NULL index entries in
      indexed <code class="literal">ROW()</code> comparisons (Tom Lane)
     </p><p>
      An index search using a row comparison such as <code class="literal">ROW(a, b) &gt;
      ROW('x', 'y')</code> would stop upon reaching a NULL entry in
      the <code class="structfield">b</code> column, ignoring the fact that there might be
      non-NULL <code class="structfield">b</code> values associated with later values
      of <code class="structfield">a</code>.
     </p></li><li class="listitem"><p>
      Avoid unlikely data-loss scenarios due to renaming files without
      adequate <code class="function">fsync()</code> calls before and after (Michael Paquier,
      Tomas Vondra, Andres Freund)
     </p></li><li class="listitem"><p>
      Fix incorrect behavior when rechecking a just-modified row in a query
      that does <code class="command">SELECT FOR UPDATE/SHARE</code> and contains some
      relations that need not be locked (Tom Lane)
     </p><p>
      Rows from non-locked relations were incorrectly treated as containing
      all NULLs during the recheck, which could result in incorrectly
      deciding that the updated row no longer passes the <code class="literal">WHERE</code>
      condition, or in incorrectly outputting NULLs.
     </p></li><li class="listitem"><p>
      Fix bug in <code class="function">json_to_record()</code> when a field of its input
      object contains a sub-object with a field name matching one of the
      requested output column names (Tom Lane)
     </p></li><li class="listitem"><p>
      Fix nonsense result from two-argument form
      of <code class="function">jsonb_object()</code> when called with empty arrays
      (Michael Paquier, Andrew Dunstan)
     </p></li><li class="listitem"><p>
      Fix misbehavior in <code class="function">jsonb_set()</code> when converting a path
      array element into an integer for use as an array subscript
      (Michael Paquier)
     </p></li><li class="listitem"><p>
      Fix misformatting of negative time zone offsets
      by <code class="function">to_char()</code>'s <code class="literal">OF</code> format code
      (Thomas Munro, Tom Lane)
     </p></li><li class="listitem"><p>
      Fix possible incorrect logging of waits done by
      <code class="command">INSERT ... ON CONFLICT</code> (Peter Geoghegan)
     </p><p>
      Log messages would sometimes claim that the wait was due to an
      exclusion constraint although no such constraint was responsible.
     </p></li><li class="listitem"><p>
      Ignore <a class="xref" href="standby-settings.html#RECOVERY-MIN-APPLY-DELAY">recovery_min_apply_delay</a> parameter until
      recovery has reached a consistent state (Michael Paquier)
     </p><p>
      Previously, standby servers would delay application of WAL records in
      response to <code class="varname">recovery_min_apply_delay</code> even while replaying
      the initial portion of WAL needed to make their database state valid.
      Since the standby is useless until it's reached a consistent database
      state, this was deemed unhelpful.
     </p></li><li class="listitem"><p>
      Correctly handle cases where <code class="literal">pg_subtrans</code> is close to XID
      wraparound during server startup (Jeff Janes)
     </p></li><li class="listitem"><p>
      Fix assorted bugs in logical decoding (Andres Freund)
     </p><p>
      Trouble cases included tuples larger than one page when replica
      identity is <code class="literal">FULL</code>, <code class="command">UPDATE</code>s that change a
      primary key within a transaction large enough to be spooled to disk,
      incorrect reports of <span class="quote">“<span class="quote">subxact logged without previous toplevel
      record</span>”</span>, and incorrect reporting of a transaction's commit time.
     </p></li><li class="listitem"><p>
      Fix planner error with nested security barrier views when the outer
      view has a <code class="literal">WHERE</code> clause containing a correlated subquery
      (Dean Rasheed)
     </p></li><li class="listitem"><p>
      Fix memory leak in GIN index searches (Tom Lane)
     </p></li><li class="listitem"><p>
      Fix corner-case crash due to trying to free <code class="function">localeconv()</code>
      output strings more than once (Tom Lane)
     </p></li><li class="listitem"><p>
      Fix parsing of affix files for <code class="literal">ispell</code> dictionaries
      (Tom Lane)
     </p><p>
      The code could go wrong if the affix file contained any characters
      whose byte length changes during case-folding, for
      example <code class="literal">I</code> in Turkish UTF8 locales.
     </p></li><li class="listitem"><p>
      Avoid use of <code class="function">sscanf()</code> to parse <code class="literal">ispell</code>
      dictionary files (Artur Zakirov)
     </p><p>
      This dodges a portability problem on FreeBSD-derived platforms
      (including macOS).
     </p></li><li class="listitem"><p>
      Fix atomic-operations code used on PPC with IBM's xlc compiler
      (Noah Misch)
     </p><p>
      This error led to rare failures of concurrent operations on that
      platform.
     </p></li><li class="listitem"><p>
      Avoid a crash on old Windows versions (before 7SP1/2008R2SP1) with an
      AVX2-capable CPU and a Postgres build done with Visual Studio 2013
      (Christian Ullrich)
     </p><p>
      This is a workaround for a bug in Visual Studio 2013's runtime
      library, which Microsoft have stated they will not fix in that
      version.
     </p></li><li class="listitem"><p>
      Fix <span class="application">psql</span>'s tab completion logic to handle multibyte
      characters properly (Kyotaro Horiguchi, Robert Haas)
     </p></li><li class="listitem"><p>
      Fix <span class="application">psql</span>'s tab completion for
      <code class="literal">SECURITY LABEL</code> (Tom Lane)
     </p><p>
      Pressing TAB after <code class="literal">SECURITY LABEL</code> might cause a crash
      or offering of inappropriate keywords.
     </p></li><li class="listitem"><p>
      Make <span class="application">pg_ctl</span> accept a wait timeout from the
      <code class="envar">PGCTLTIMEOUT</code> environment variable, if none is specified on
      the command line (Noah Misch)
     </p><p>
      This eases testing of slower buildfarm members by allowing them
      to globally specify a longer-than-normal timeout for postmaster
      startup and shutdown.
     </p></li><li class="listitem"><p>
      Fix incorrect test for Windows service status
      in <span class="application">pg_ctl</span> (Manuel Mathar)
     </p><p>
      The previous set of minor releases attempted to
      fix <span class="application">pg_ctl</span> to properly determine whether to send log
      messages to Window's Event Log, but got the test backwards.
     </p></li><li class="listitem"><p>
      Fix <span class="application">pgbench</span> to correctly handle the combination
      of <code class="literal">-C</code> and <code class="literal">-M prepared</code> options (Tom Lane)
     </p></li><li class="listitem"><p>
      In <span class="application">pg_upgrade</span>, skip creating a deletion script when
      the new data directory is inside the old data directory (Bruce
      Momjian)
     </p><p>
      Blind application of the script in such cases would result in loss of
      the new data directory.
     </p></li><li class="listitem"><p>
      In PL/Perl, properly translate empty Postgres arrays into empty Perl
      arrays (Alex Hunsaker)
     </p></li><li class="listitem"><p>
      Make PL/Python cope with function names that aren't valid Python
      identifiers (Jim Nasby)
     </p></li><li class="listitem"><p>
      Fix multiple mistakes in the statistics returned
      by <code class="filename">contrib/pgstattuple</code>'s <code class="function">pgstatindex()</code>
      function (Tom Lane)
     </p></li><li class="listitem"><p>
      Remove dependency on <code class="literal">psed</code> in MSVC builds, since it's no
      longer provided by core Perl (Michael Paquier, Andrew Dunstan)
     </p></li><li class="listitem"><p>
      Update time zone data files to <span class="application">tzdata</span> release 2016c
      for DST law changes in Azerbaijan, Chile, Haiti, Palestine, and Russia
      (Altai, Astrakhan, Kirov, Sakhalin, Ulyanovsk regions), plus
      historical corrections for Lithuania, Moldova, and Russia
      (Kaliningrad, Samara, Volgograd).
     </p></li></ul></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="release-9-5-3.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="release.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="release-9-5-1.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">E.34. Release 9.5.3 </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> E.36. Release 9.5.1</td></tr></table></div></body></html>