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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!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.2. Release 15.6</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="release-15-7.html" title="E.1. Release 15.7" /><link rel="next" href="release-15-5.html" title="E.3. Release 15.5" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">E.2. Release 15.6</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="release-15-7.html" title="E.1. Release 15.7">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 15.7 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="release-15-5.html" title="E.3. Release 15.5">Next</a></td></tr></table><hr /></div><div class="sect1" id="RELEASE-15-6"><div class="titlepage"><div><div><h2 class="title" style="clear: both">E.2. Release 15.6</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="sect2"><a href="release-15-6.html#id-1.11.6.6.4">E.2.1. Migration to Version 15.6</a></span></dt><dt><span class="sect2"><a href="release-15-6.html#id-1.11.6.6.5">E.2.2. Changes</a></span></dt></dl></div><p><strong>Release date: </strong>2024-02-08</p><p>
This release contains a variety of fixes from 15.5.
For information about new features in major release 15, see
<a class="xref" href="release-15.html" title="E.8. Release 15">Section E.8</a>.
</p><div class="sect2" id="id-1.11.6.6.4"><div class="titlepage"><div><div><h3 class="title">E.2.1. Migration to Version 15.6</h3></div></div></div><p>
A dump/restore is not required for those running 15.X.
</p><p>
However, one bug was fixed that could have resulted in corruption of
GIN indexes during concurrent updates. If you suspect such
corruption, reindex affected indexes after installing this update.
</p><p>
Also, if you are upgrading from a version earlier than 15.5,
see <a class="xref" href="release-15-5.html" title="E.3. Release 15.5">Section E.3</a>.
</p></div><div class="sect2" id="id-1.11.6.6.5"><div class="titlepage"><div><div><h3 class="title">E.2.2. Changes</h3></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>
Tighten security restrictions within <code class="command">REFRESH MATERIALIZED
VIEW CONCURRENTLY</code> (Heikki Linnakangas)
</p><p>
One step of a concurrent refresh command was run under weak security
restrictions. If a materialized view's owner could persuade a
superuser or other high-privileged user to perform a concurrent
refresh on that view, the view's owner could control code executed
with the privileges of the user running <code class="command">REFRESH</code>.
Fix things so that all user-determined code is run as the view's
owner, as expected.
</p><p>
The only known exploit for this error does not work
in <span class="productname">PostgreSQL</span> 16.0 and later, so it may
be that v16 is not vulnerable in practice.
</p><p>
The <span class="productname">PostgreSQL</span> Project thanks Pedro
Gallegos for reporting this problem.
(CVE-2024-0985)
</p></li><li class="listitem"><p>
Fix memory leak when performing JIT inlining (Andres Freund,
Daniel Gustafsson)
</p><p>
There have been multiple reports of backend processes suffering
out-of-memory conditions after sufficiently many JIT compilations.
This fix should resolve that.
</p></li><li class="listitem"><p>
When dequeueing from an LWLock, avoid needing to search the list of
waiting processes (Andres Freund)
</p><p>
This fixes O(N^2) behavior when the list of waiters is long. In
some use-cases this results in substantial throughput improvements.
</p></li><li class="listitem"><p>
Avoid generating incorrect partitioned-join plans (Richard Guo)
</p><p>
Some uncommon situations involving lateral references could create
incorrect plans. Affected queries could produce wrong answers, or
odd failures such as <span class="quote">“<span class="quote">variable not found in subplan target
list</span>”</span>, or executor crashes.
</p></li><li class="listitem"><p>
Fix incorrect wrapping of subquery output expressions in
PlaceHolderVars (Tom Lane)
</p><p>
This fixes incorrect results when a subquery is underneath an outer
join and has an output column that laterally references something
outside the outer join's scope. The output column might not appear
as NULL when it should do so due to the action of the outer join.
</p></li><li class="listitem"><p>
Fix misprocessing of window function run conditions (Richard Guo)
</p><p>
This oversight could lead to <span class="quote">“<span class="quote">WindowFunc not found in subplan
target lists</span>”</span> errors.
</p></li><li class="listitem"><p>
Skip inappropriate actions when <code class="command">MERGE</code> causes a
cross-partition update (Dean Rasheed)
</p><p>
When executing a <code class="literal">MERGE UPDATE</code> action on a
partitioned table, if the <code class="literal">UPDATE</code> is turned into
a <code class="literal">DELETE</code> and <code class="literal">INSERT</code> due to
changing a partition key column, skip firing <code class="literal">AFTER
UPDATE ROW</code> triggers, as well as other post-update actions
such as RLS checks. These actions would typically fail, which is
why a regular <code class="literal">UPDATE</code> doesn't do them in such
cases; <code class="literal">MERGE</code> shouldn't either.
</p></li><li class="listitem"><p>
Cope with <code class="literal">BEFORE ROW DELETE</code> triggers in
cross-partition <code class="command">MERGE</code> updates (Dean Rasheed)
</p><p>
If such a trigger attempted to prevent the update by returning
NULL, <code class="command">MERGE</code> would suffer an error or assertion
failure.
</p></li><li class="listitem"><p>
Prevent access to a no-longer-pinned buffer in <code class="literal">BEFORE ROW
UPDATE</code> triggers (Alexander Lakhin, Tom Lane)
</p><p>
If the tuple being updated had just been updated and moved to
another page by another session, there was a narrow window where
we would attempt to fetch data from the new tuple version without
any pin on its buffer. In principle this could result in garbage
data appearing in non-updated columns of the proposed new tuple.
The odds of problems in practice seem rather low, however.
</p></li><li class="listitem"><p>
Avoid requesting an oversize shared-memory area in parallel hash
join (Thomas Munro, Andrei Lepikhov, Alexander Korotkov)
</p><p>
The limiting value was too large, allowing <span class="quote">“<span class="quote">invalid DSA memory
alloc request size</span>”</span> errors to occur with sufficiently large
expected hash table sizes.
</p></li><li class="listitem"><p>
Avoid assertion failures in <code class="function">heap_update()</code>
and <code class="function">heap_delete()</code> when a tuple to be updated by
a foreign-key enforcement trigger fails the extra visibility
crosscheck (Alexander Lakhin)
</p><p>
This error had no impact in non-assert builds.
</p></li><li class="listitem"><p>
Fix overly tight assertion
about <code class="varname">false_positive_rate</code> parameter of
BRIN bloom operator classes (Alexander Lakhin)
</p><p>
This error had no impact in non-assert builds, either.
</p></li><li class="listitem"><p>
Fix possible failure during <code class="command">ALTER TABLE ADD
COLUMN</code> on a complex inheritance tree (Tender Wang)
</p><p>
If a grandchild table would inherit the new column via multiple
intermediate parents, the command failed with <span class="quote">“<span class="quote">tuple already
updated by self</span>”</span>.
</p></li><li class="listitem"><p>
Fix problems with duplicate token names in <code class="command">ALTER TEXT
SEARCH CONFIGURATION ... MAPPING</code> commands (Tender Wang,
Michael Paquier)
</p></li><li class="listitem"><p>
Properly lock the associated table during <code class="command">DROP
STATISTICS</code> (Tomas Vondra)
</p><p>
Failure to acquire the lock could result in <span class="quote">“<span class="quote">tuple
concurrently deleted</span>”</span> errors if the <code class="command">DROP</code>
executes concurrently with <code class="command">ANALYZE</code>.
</p></li><li class="listitem"><p>
Fix function volatility checking for <code class="literal">GENERATED</code>
and <code class="literal">DEFAULT</code> expressions (Tom Lane)
</p><p>
These places could fail to detect insertion of a volatile function
default-argument expression, or decide that a polymorphic function
is volatile although it is actually immutable on the datatype of
interest. This could lead to improperly rejecting or accepting
a <code class="literal">GENERATED</code> clause, or to mistakenly applying the
constant-default-value optimization in <code class="command">ALTER TABLE ADD
COLUMN</code>.
</p></li><li class="listitem"><p>
Detect that a new catalog cache entry became stale while detoasting
its fields (Tom Lane)
</p><p>
We expand any out-of-line fields in a catalog tuple before inserting
it into the catalog caches. That involves database access which
might cause invalidation of catalog cache entries — but the
new entry isn't in the cache yet, so we would miss noticing that it
should get invalidated. The result is a race condition in which an
already-stale cache entry could get made, and then persist
indefinitely. This would lead to hard-to-predict misbehavior.
Fix by rechecking the tuple's visibility after detoasting.
</p></li><li class="listitem"><p>
Fix edge-case integer overflow detection bug on some platforms (Dean
Rasheed)
</p><p>
Computing <code class="literal">0 - INT64_MIN</code> should result in an
overflow error, and did on most platforms. However, platforms with
neither integer overflow builtins nor 128-bit integers would fail to
spot the overflow, instead returning <code class="literal">INT64_MIN</code>.
</p></li><li class="listitem"><p>
Detect Julian-date overflow when adding or subtracting
an <code class="type">interval</code> to/from a <code class="type">timestamp</code> (Tom Lane)
</p><p>
Some cases that should cause an out-of-range error produced an
incorrect result instead.
</p></li><li class="listitem"><p>
Add more checks for overflow in <code class="function">interval_mul()</code>
and <code class="function">interval_div()</code> (Dean Rasheed)
</p><p>
Some cases that should cause an out-of-range error produced an
incorrect result instead.
</p></li><li class="listitem"><p>
Ensure cached statistics are discarded after a change
to <code class="varname">stats_fetch_consistency</code> (Shinya Kato)
</p><p>
In some code paths, it was possible for stale statistics to be
returned.
</p></li><li class="listitem"><p>
Make the <code class="structname">pg_file_settings</code> view check
validity of unapplied values for settings
with <code class="literal">backend</code>
or <code class="literal">superuser-backend</code> context (Tom Lane)
</p><p>
Invalid values were not noted in the view as intended. This escaped
detection because there are very few settings in these groups.
</p></li><li class="listitem"><p>
Match collation too when matching an existing index to a new
partitioned index (Peter Eisentraut)
</p><p>
Previously we could accept an index that has a different collation
from the corresponding element of the partition key, possibly
leading to misbehavior.
</p></li><li class="listitem"><p>
Avoid failure if a child index is dropped concurrently
with <code class="command">REINDEX INDEX</code> on a partitioned index
(Fei Changhong)
</p></li><li class="listitem"><p>
Fix insufficient locking when cleaning up an incomplete split of
a GIN index's internal page (Fei Changhong, Heikki Linnakangas)
</p><p>
The code tried to do this with shared rather than exclusive lock on
the buffer. This could lead to index corruption if two processes
attempted the cleanup concurrently.
</p></li><li class="listitem"><p>
Avoid premature release of buffer pin in GIN index insertion
(Tom Lane)
</p><p>
If an index root page split occurs concurrently with our own
insertion, the code could fail with <span class="quote">“<span class="quote">buffer NNNN is not owned
by resource owner</span>”</span>.
</p></li><li class="listitem"><p>
Avoid failure with partitioned SP-GiST indexes (Tom Lane)
</p><p>
Trying to use an index of this kind could lead to <span class="quote">“<span class="quote">No such
file or directory</span>”</span> errors.
</p></li><li class="listitem"><p>
Fix ownership change reporting for large objects (Tom Lane)
</p><p>
A no-op <code class="command">ALTER LARGE OBJECT OWNER</code> command (that
is, one selecting the existing owner) passed the wrong class ID to
the <code class="varname">PostAlterHook</code>, probably confusing any
extension using that hook.
</p></li><li class="listitem"><p>
Fix reporting of I/O timing data in <code class="literal">EXPLAIN
(BUFFERS)</code> (Michael Paquier)
</p><p>
The numbers labeled as <span class="quote">“<span class="quote">shared/local</span>”</span> actually refer
only to shared buffers, so change that label
to <span class="quote">“<span class="quote">shared</span>”</span>.
</p></li><li class="listitem"><p>
Ensure durability of <code class="command">CREATE DATABASE</code> (Noah Misch)
</p><p>
If an operating system crash occurred during or shortly
after <code class="command">CREATE DATABASE</code>, recovery could fail, or
subsequent connections to the new database could fail. If a base
backup was taken in that window, similar problems could be observed
when trying to use the backup. The symptom would be that the
database directory, <code class="filename">PG_VERSION</code> file, or
<code class="filename">pg_filenode.map</code> file was missing or empty.
</p></li><li class="listitem"><p>
Add more <code class="literal">LOG</code> messages when starting and ending
recovery from a backup (Andres Freund)
</p><p>
This change provides additional information in the postmaster log
that may be useful for diagnosing recovery problems.
</p></li><li class="listitem"><p>
Prevent standby servers from incorrectly processing dead index
tuples during subtransactions (Fei Changhong)
</p><p>
The <code class="structfield">startedInRecovery</code> flag was not
correctly set for a subtransaction. This affects only processing of
dead index tuples. It could allow a query in a subtransaction to
ignore index entries that it should return (if they are already dead
on the primary server, but not dead to the standby transaction), or
to prematurely mark index entries as dead that are not yet dead on
the primary. It is not clear that the latter case has any serious
consequences, but it's not the intended behavior.
</p></li><li class="listitem"><p>
Fix integer overflow hazard in checking whether a record will fit
into the WAL decoding buffer (Thomas Munro)
</p><p>
This bug appears to be only latent except when running a
32-bit <span class="productname">PostgreSQL</span> build on a 64-bit
platform.
</p></li><li class="listitem"><p>
Fix deadlock between a logical replication apply worker, its
tablesync worker, and a session process trying to alter the
subscription (Shlok Kyal)
</p><p>
One edge of the deadlock loop did not involve a lock wait, so the
deadlock went undetected and would persist until manual
intervention.
</p></li><li class="listitem"><p>
Ensure that column default values are correctly transmitted by
the <span class="application">pgoutput</span> logical replication plugin
(Nikhil Benesch)
</p><p>
<code class="command">ALTER TABLE ADD COLUMN</code> with a constant default
value for the new column avoids rewriting existing tuples, instead
expecting that reading code will insert the correct default into a
tuple that lacks that column. If replication was subsequently
initiated on the table, <span class="application">pgoutput</span> would
transmit NULL instead of the correct default for such a column,
causing incorrect replication on the subscriber.
</p></li><li class="listitem"><p>
Fix failure of logical replication's initial sync for a table with
no columns (Vignesh C)
</p><p>
This case generated an improperly-formatted <code class="command">COPY</code>
command.
</p></li><li class="listitem"><p>
Prevent examining system catalogs with the wrong snapshot during
logical decoding (Fei Changhong)
</p><p>
If decoding begins partway through a transaction that modifies
system catalogs, the decoder may not recognize that, causing it to
fail to treat that transaction as in-progress for catalog lookups.
This fix deals with the case that a top-level transaction is already
marked as containing catalog changes, but its subtransaction(s) are
not.
</p></li><li class="listitem"><p>
Return the correct status code when a new client disconnects without
responding to the server's password challenge (Liu Lang, Tom Lane)
</p><p>
In some cases we'd treat this as a loggable error, which was not the
intention and tends to create log spam, since common clients
like <span class="application">psql</span> frequently do this. It may
also confuse extensions that
use <code class="varname">ClientAuthentication_hook</code>.
</p></li><li class="listitem"><p>
Fix incompatibility with <span class="application">OpenSSL</span> 3.2
(Tristan Partin, Bo Andreson)
</p><p>
Use the BIO <span class="quote">“<span class="quote">app_data</span>”</span> field for our private storage,
instead of assuming it's okay to use the <span class="quote">“<span class="quote">data</span>”</span> field.
This mistake didn't cause problems before, but with 3.2 it leads
to crashes and complaints about double frees.
</p></li><li class="listitem"><p>
Be more wary about <span class="application">OpenSSL</span> not
setting <code class="varname">errno</code> on error (Tom Lane)
</p><p>
If <code class="varname">errno</code> isn't set, assume the cause of the
reported failure is read EOF. This fixes rare cases of strange
error reports like <span class="quote">“<span class="quote">could not accept SSL connection:
Success</span>”</span>.
</p></li><li class="listitem"><p>
Fix file descriptor leakage when a foreign data
wrapper's <code class="function">ForeignAsyncRequest</code> function fails
(Heikki Linnakangas)
</p></li><li class="listitem"><p>
Report <span class="systemitem">ENOMEM</span> errors from file-related system
calls as <code class="literal">ERRCODE_OUT_OF_MEMORY</code>,
not <code class="literal">ERRCODE_INTERNAL_ERROR</code> (Alexander Kuzmenkov)
</p></li><li class="listitem"><p>
In <span class="application">PL/pgSQL</span>, support SQL commands that
are <code class="command">CREATE FUNCTION</code>/<code class="command">CREATE
PROCEDURE</code> with SQL-standard bodies (Tom Lane)
</p><p>
Previously, such cases failed with parsing errors due to the
semicolon(s) appearing in the function body.
</p></li><li class="listitem"><p>
Fix <span class="application">libpq</span>'s
handling of errors in pipelines (Álvaro Herrera)
</p><p>
The pipeline state could get out of sync if an error is returned
for reasons other than a query problem (for example, if the
connection is lost). Potentially this would lead to a busy-loop in
the calling application.
</p></li><li class="listitem"><p>
Make <span class="application">libpq</span>'s
<code class="function">PQsendFlushRequest()</code> function flush the client
output buffer under the same rules as
other <code class="literal">PQsend</code> functions (Jelte Fennema-Nio)
</p><p>
In pipeline mode, it may still be necessary to
call <code class="function">PQflush()</code> as well; but this change removes
some inconsistency.
</p></li><li class="listitem"><p>
Avoid race condition when <span class="application">libpq</span>
initializes OpenSSL support concurrently in two different threads
(Willi Mann, Michael Paquier)
</p></li><li class="listitem"><p>
Fix timing-dependent failure in GSSAPI data transmission (Tom Lane)
</p><p>
When using GSSAPI encryption in non-blocking
mode, <span class="application">libpq</span> sometimes failed
with <span class="quote">“<span class="quote">GSSAPI caller failed to retransmit all data needing to
be retried</span>”</span>.
</p></li><li class="listitem"><p>
In <span class="application">pg_dump</span>, don't dump RLS policies or
security labels for extension member objects (Tom Lane, Jacob
Champion)
</p><p>
Previously, commands would be included in the dump to set these
properties, which is really incorrect since they should be
considered as internal affairs of the extension. Moreover, the
restoring user might not have adequate privilege to set them, and
indeed the dumping user might not have enough privilege to dump them
(since dumping RLS policies requires acquiring lock on their table).
</p></li><li class="listitem"><p>
In <span class="application">pg_dump</span>, don't dump an extended
statistics object if its underlying table isn't being dumped
(Rian McGuire, Tom Lane)
</p><p>
This conforms to the behavior for other dependent objects such as
indexes.
</p></li><li class="listitem"><p>
Make it an error for a <span class="application">pgbench</span> script to
end with an open pipeline (Anthonin Bonnefoy)
</p><p>
Previously, <span class="application">pgbench</span> would behave oddly if
a <code class="command">\startpipeline</code> command lacked a
matching <code class="command">\endpipeline</code>. This seems like a
scripting mistake rather than a case
that <span class="application">pgbench</span> needs to handle nicely, so
throw an error.
</p></li><li class="listitem"><p>
Fix crash in <code class="filename">contrib/intarray</code> if an array with
an element equal to <code class="literal">INT_MAX</code> is inserted into
a <code class="literal">gist__int_ops</code> index
(Alexander Lakhin, Tom Lane)
</p></li><li class="listitem"><p>
Report a better error
when <code class="filename">contrib/pageinspect</code>'s
<code class="function">hash_bitmap_info()</code> function is applied to a
partitioned hash index (Alexander Lakhin, Michael Paquier)
</p></li><li class="listitem"><p>
Report a better error
when <code class="filename">contrib/pgstattuple</code>'s
<code class="function">pgstathashindex()</code> function is applied to a
partitioned hash index (Alexander Lakhin)
</p></li><li class="listitem"><p>
On Windows, suppress autorun options when launching subprocesses
in <span class="application">pg_ctl</span>
and <span class="application">pg_regress</span> (Kyotaro Horiguchi)
</p><p>
When launching a child process via <code class="filename">cmd.exe</code>,
pass the <code class="option">/D</code> flag to prevent executing any autorun
commands specified in the registry. This avoids possibly-surprising
side effects.
</p></li><li class="listitem"><p>
Move <code class="function">is_valid_ascii()</code>
from <code class="filename">mb/pg_wchar.h</code>
to <code class="filename">utils/ascii.h</code> (Jubilee Young)
</p><p>
This change avoids the need to
include <code class="filename"><simd.h></code>
in <code class="filename">pg_wchar.h</code>, which was causing problems for
some third-party code.
</p></li><li class="listitem"><p>
Fix compilation failures with <span class="application">libxml2</span>
version 2.12.0 and later (Tom Lane)
</p></li><li class="listitem"><p>
Fix compilation failure of <code class="literal">WAL_DEBUG</code> code on
Windows (Bharath Rupireddy)
</p></li><li class="listitem"><p>
Suppress compiler warnings from Python's header files
(Peter Eisentraut, Tom Lane)
</p><p>
Our preferred compiler options provoke warnings about constructs
appearing in recent versions of Python's header files. When using
<span class="application">gcc</span>, we can suppress these warnings with
a pragma.
</p></li><li class="listitem"><p>
Avoid deprecation warning when compiling with LLVM 18 (Thomas Munro)
</p></li><li class="listitem"><p>
Update time zone data files to <span class="application">tzdata</span>
release 2024a for DST law changes in Greenland, Kazakhstan, and
Palestine, plus corrections for the Antarctic stations Casey and
Vostok. Also historical corrections for Vietnam, Toronto, and
Miquelon.
</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-15-7.html" title="E.1. Release 15.7">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="release.html" title="Appendix E. Release Notes">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="release-15-5.html" title="E.3. Release 15.5">Next</a></td></tr><tr><td width="40%" align="left" valign="top">E.1. Release 15.7 </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.7 Documentation">Home</a></td><td width="40%" align="right" valign="top"> E.3. Release 15.5</td></tr></table></div></body></html>
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