PostgreSQL 12.15 (upcoming) commit log

doc: Fix XML_CATALOG_FILES env var for Apple Silicon machines

commit   : aad9a2ee7c2d381bfa3317ecfb2cd28601b0aa19    
author   : Daniel Gustafsson <>    
date     : Mon, 27 Mar 2023 21:35:30 +0200    
committer: Daniel Gustafsson <>    
date     : Mon, 27 Mar 2023 21:35:30 +0200    

Click here for diff

Homebrew changed the prefix for Apple Silicon based machines, so  
our advice for XML_CATALOG_FILES needs to mention both.  More info  
on the Homebrew change can be found at:  
This is backpatch of commits 4c8d65408 and 5a91c7975, the latter  
which contained a small fix based on a report from Dagfinn Ilmari  
Author: Julien Rouhaud <>  

M doc/src/sgml/docguide.sgml

Reject attempts to alter composite types used in indexes.

commit   : cd07163c0e36596a53154c7fb7ffb479d225fe78    
author   : Tom Lane <>    
date     : Mon, 27 Mar 2023 15:04:02 -0400    
committer: Tom Lane <>    
date     : Mon, 27 Mar 2023 15:04:02 -0400    

Click here for diff

find_composite_type_dependencies() ignored indexes, which is a poor  
decision because an expression index could have a stored column of  
a composite (or other container) type even when the underlying table  
does not.  Teach it to detect such cases and error out.  We have to  
work a bit harder than for other relations because the pg_depend entry  
won't identify the specific index column of concern, but it's not much  
new code.  
This does not address bug #17872's original complaint that dropping  
a column in such a type might lead to violations of the uniqueness  
property that a unique index is supposed to ensure.  That seems of  
much less concern to me because it won't lead to crashes.  
Per bug #17872 from Alexander Lakhin.  Back-patch to all supported  

M src/backend/commands/tablecmds.c
M src/test/regress/expected/alter_table.out
M src/test/regress/sql/alter_table.sql

Fix oversights in array manipulation.

commit   : ad5fe7420594811d3ca4054a8397c5cc8c6575e2    
author   : Tom Lane <>    
date     : Sun, 26 Mar 2023 13:41:06 -0400    
committer: Tom Lane <>    
date     : Sun, 26 Mar 2023 13:41:06 -0400    

Click here for diff

The nested-arrays code path in ExecEvalArrayExpr() used palloc to  
allocate the result array, whereas every other array-creating function  
has used palloc0 since 18c0b4ecc.  This mostly works, but unused bits  
past the end of the nulls bitmap may end up undefined.  That causes  
valgrind complaints with -DWRITE_READ_PARSE_PLAN_TREES, and could  
cause planner misbehavior as cited in 18c0b4ecc.  There seems no very  
good reason why we should strive to avoid palloc0 in just this one case,  
so fix it the easy way with s/palloc/palloc0/.  
While looking at that I noted that we also failed to check for overflow  
of "nbytes" and "nitems" while summing the sizes of the sub-arrays,  
potentially allowing a crash due to undersized output allocation.  
For "nbytes", follow the policy used by other array-munging code of  
checking for overflow after each addition.  (As elsewhere, the last  
addition of the array's overhead space doesn't need an extra check,  
since palloc itself will catch a value between 1Gb and 2Gb.)  
For "nitems", there's no very good reason to sum the inputs at all,  
since we can perfectly well use ArrayGetNItems' result instead of  
ignoring it.  
Per discussion of this bug, also remove redundant zeroing of the  
nulls bitmap in array_set_element and array_set_slice.  
Patch by Alexander Lakhin and myself, per bug #17858 from Alexander  
Lakhin; thanks also to Richard Guo.  These bugs are a dozen years old,  
so back-patch to all supported branches.  

M src/backend/executor/execExprInterp.c
M src/backend/utils/adt/arrayfuncs.c

Ignore generated columns during apply of update/delete.

commit   : 0f2d4adbf85f7f4e3d5afda419e8fc87b89862f2    
author   : Amit Kapila <>    
date     : Thu, 23 Mar 2023 11:08:38 +0530    
committer: Amit Kapila <>    
date     : Thu, 23 Mar 2023 11:08:38 +0530    

Click here for diff

We fail to apply updates and deletes when the REPLICA IDENTITY FULL is  
used for the table having generated columns. We didn't use to ignore  
generated columns while doing tuple comparison among the tuples from  
the publisher and subscriber during apply of updates and deletes.  
Author: Onder Kalaci  
Reviewed-by: Shi yu, Amit Kapila  
Backpatch-through: 12  

M src/backend/executor/execReplication.c
M src/test/subscription/t/

doc: Add description of some missing monitoring functions

commit   : 488ace333584d345b4bf76992e81b0b7ef52cbe0    
author   : Michael Paquier <>    
date     : Wed, 22 Mar 2023 18:32:09 +0900    
committer: Michael Paquier <>    
date     : Wed, 22 Mar 2023 18:32:09 +0900    

Click here for diff

This commit adds some documentation about two monitoring functions:  
- pg_stat_get_xact_blocks_fetched()  
- pg_stat_get_xact_blocks_hit()  
The description of these functions has been removed in ddfc2d9, later  
simplified by 5f2b089, assuming that all the functions whose  
descriptions were removed are used in system views.  Unfortunately, some  
of them were are not used in any system views, so they lacked  
This gap exists in the docs for a long time, so backpatch all the way  
Reported-by: Michael Paquier  
Author: Bertrand Drouvot  
Reviewed-by: Kyotaro Horiguchi  
Backpatch-through: 11  

M doc/src/sgml/monitoring.sgml

Ignore dropped columns during apply of update/delete.

commit   : fc63e6ba8670e0eb1bc40ae9fe4acdd4203bc36e    
author   : Amit Kapila <>    
date     : Tue, 21 Mar 2023 08:50:23 +0530    
committer: Amit Kapila <>    
date     : Tue, 21 Mar 2023 08:50:23 +0530    

Click here for diff

We fail to apply updates and deletes when the REPLICA IDENTITY FULL is  
used for the table having dropped columns. We didn't use to ignore dropped  
columns while doing tuple comparison among the tuples from the publisher  
and subscriber during apply of updates and deletes.  
Author: Onder Kalaci, Shi yu  
Reviewed-by: Amit Kapila  

M src/backend/executor/execReplication.c
M src/test/subscription/t/

Fix race in parallel hash join batch cleanup, take II.

commit   : 44d44aa9712f315b125c9c5f2a1640ebb70e1d2f    
author   : Thomas Munro <>    
date     : Tue, 21 Mar 2023 14:29:34 +1300    
committer: Thomas Munro <>    
date     : Tue, 21 Mar 2023 14:29:34 +1300    

Click here for diff

With unlucky timing and parallel_leader_participation=off (not the  
default), PHJ could attempt to access per-batch shared state just as it  
was being freed.  There was code intended to prevent that by checking  
for a cleared pointer, but it was racy.  Fix, by introducing an extra  
barrier phase.  The new phase PHJ_BUILD_RUNNING means that it's safe to  
access the per-batch state to find a batch to help with, and  
PHJ_BUILD_DONE means that it is too late.  The last to detach will free  
the array of per-batch state as before, but now it will also atomically  
advance the phase, so that late attachers can avoid the hazard.  This  
mirrors the way per-batch hash tables are freed (see phases  
An earlier attempt to fix this (commit 3b8981b6, later reverted) missed  
one special case.  When the inner side is empty (the "empty inner  
optimization), the build barrier would only make it to  
PHJ_BUILD_HASHING_INNER phase before workers attempted to detach from  
the hashtable.  In that case, fast-forward the build barrier to  
PHJ_BUILD_RUNNING before proceeding, so that our later assertions hold  
and we can still negotiate who is cleaning up.  
Revealed by build farm failures, where BarrierAttach() failed a sanity  
check assertion, because the memory had been clobbered by dsa_free().  
In non-assert builds, the result could be a segmentation fault.  
Back-patch to all supported releases.  
Author: Thomas Munro <>  
Author: Melanie Plageman <>  
Reported-by: Michael Paquier <>  
Reported-by: David Geier <>  
Tested-by: David Geier <>  

M src/backend/executor/nodeHash.c
M src/backend/executor/nodeHashjoin.c
M src/include/executor/hashjoin.h

Doc: fix documentation example for bytea hex output format.

commit   : 92865681c23000e390345129ee742662e33aa09e    
author   : Tom Lane <>    
date     : Sat, 18 Mar 2023 16:11:22 -0400    
committer: Tom Lane <>    
date     : Sat, 18 Mar 2023 16:11:22 -0400    

Click here for diff

Per report from rsindlin  

M doc/src/sgml/datatype.sgml

Fix pg_dump for hash partitioning on enum columns.

commit   : 8f83ce8c5244ce40514e8643a648704d8c85baa9    
author   : Tom Lane <>    
date     : Fri, 17 Mar 2023 13:31:40 -0400    
committer: Tom Lane <>    
date     : Fri, 17 Mar 2023 13:31:40 -0400    

Click here for diff

Hash partitioning on an enum is problematic because the hash codes are  
derived from the OIDs assigned to the enum values, which will almost  
certainly be different after a dump-and-reload than they were before.  
This means that some rows probably end up in different partitions than  
before, causing restore to fail because of partition constraint  
violations.  (pg_upgrade dodges this problem by using hacks to force  
the enum values to keep the same OIDs, but that's not possible nor  
desirable for pg_dump.)  
Users can work around that by specifying --load-via-partition-root,  
but since that's a dump-time not restore-time decision, one might  
find out the need for it far too late.  Instead, teach pg_dump to  
apply that option automatically when dealing with a partitioned  
table that has hash-on-enum partitioning.  
Also deal with a pre-existing issue for --load-via-partition-root  
mode: in a parallel restore, we try to TRUNCATE target tables just  
before loading them, in order to enable some backend optimizations.  
This is bad when using --load-via-partition-root because (a) we're  
likely to suffer deadlocks from restore jobs trying to restore rows  
into other partitions than they came from, and (b) if we miss getting  
a deadlock we might still lose data due to a TRUNCATE removing rows  
from some already-completed restore job.  
The fix for this is conceptually simple: just don't TRUNCATE if we're  
dealing with a --load-via-partition-root case.  The tricky bit is for  
pg_restore to identify those cases.  In dumps using COPY commands we  
can inspect each COPY command to see if it targets the nominal target  
table or some ancestor.  However, in dumps using INSERT commands it's  
pretty impractical to examine the INSERTs in advance.  To provide a  
solution for that going forward, modify pg_dump to mark TABLE DATA  
items that are using --load-via-partition-root with a comment.  
(This change also responds to a complaint from Robert Haas that  
the dump output for --load-via-partition-root is pretty confusing.)  
pg_restore checks for the special comment as well as checking the  
COPY command if present.  This will fail to identify the combination  
of --load-via-partition-root and --inserts in pre-existing dump files,  
but that should be a pretty rare case in the field.  If it does  
happen you will probably get a deadlock failure that you can work  
around by not using parallel restore, which is the same as before  
this bug fix.  
Having done this, there seems no remaining reason for the alarmism  
in the pg_dump man page about combining --load-via-partition-root  
with parallel restore, so remove that warning.  
Patch by me; thanks to Julien Rouhaud for review.  Back-patch to  
v11 where hash partitioning was introduced.  

M doc/src/sgml/ref/pg_dump.sgml
M doc/src/sgml/ref/pg_dumpall.sgml
M src/bin/pg_dump/common.c
M src/bin/pg_dump/pg_backup_archiver.c
M src/bin/pg_dump/pg_dump.c
M src/bin/pg_dump/pg_dump.h
A src/bin/pg_dump/t/

tests: Prevent syslog activity by slapd, take 2

commit   : dbe926b91ecb01e05343ac8539e66ef0d4c3b11e    
author   : Andres Freund <>    
date     : Thu, 16 Mar 2023 23:03:31 -0700    
committer: Andres Freund <>    
date     : Thu, 16 Mar 2023 23:03:31 -0700    

Click here for diff

Unfortunately it turns out that the logfile-only option added in b9f8d1cbad7  
is only available in openldap starting in 2.6.  
Luckily the option to control the log level (loglevel/-s) have been around for  
much longer. As it turns out loglevel/-s only control what goes into syslog,  
not what ends up in the file specified with 'logfile' and stderr.  
While we currently are specifying 'logfile', nothing ends up in it, as the  
option only controls debug messages, and we didn't set a debug level. The  
debug level can only be configured on the commandline and also prevents  
forking. That'd require larger changes, so this commit doesn't tackle that  
Specify the syslog level when starting slapd using -s, as that allows to  
prevent all syslog messages if one uses '0' instead of 'none', while loglevel  
doesn't prevent the first message.  
Backpatch: 11-  

M src/test/ldap/t/

tests: Minimize syslog activity by slapd

commit   : 54f07ced96e9125e5cdc9dd260e208687b533799    
author   : Andres Freund <>    
date     : Thu, 16 Mar 2023 17:48:47 -0700    
committer: Andres Freund <>    
date     : Thu, 16 Mar 2023 17:48:47 -0700    

Click here for diff

Until now the tests using slapd spammed syslog for every connection /  
query. Use logfile-only to prevent syslog activity. Unfortunately that only  
takes effect after logging the first message, but that's still much better  
than the prior situation.  
Backpatch: 11-  

M src/test/ldap/t/

Small tidyup for commit d41a178b, part II.

commit   : 8fcd1517f0d7d57fe9cf586a1419936ce90c5e97    
author   : Thomas Munro <>    
date     : Fri, 17 Mar 2023 14:44:12 +1300    
committer: Thomas Munro <>    
date     : Fri, 17 Mar 2023 14:44:12 +1300    

Click here for diff

Further to commit 6a9229da, checking for NULL is now redundant.  An "out  
of memory" error would have been thrown already by palloc() and treated  
as FATAL, so we can delete a few more lines.  
Back-patch to all releases, like those other commits.  
Reported-by: Tom Lane <>  

M src/backend/postmaster/postmaster.c

Work around spurious compiler warning in inet operators

commit   : c1266562feebf167105a15b0575ad863492d533d    
author   : Andres Freund <>    
date     : Thu, 16 Mar 2023 14:08:44 -0700    
committer: Andres Freund <>    
date     : Thu, 16 Mar 2023 14:08:44 -0700    

Click here for diff

gcc 12+ has complaints like the following:  
../../../../../pgsql/src/backend/utils/adt/network.c: In function 'inetnot':  
../../../../../pgsql/src/backend/utils/adt/network.c:1893:34: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]  
 1893 |                         pdst[nb] = ~pip[nb];  
      |                         ~~~~~~~~~^~~~~~~~~~  
../../../../../pgsql/src/include/utils/inet.h:27:23: note: at offset -1 into destination object 'ipaddr' of size 16  
   27 |         unsigned char ipaddr[16];       /* up to 128 bits of address */  
      |                       ^~~~~~  
../../../../../pgsql/src/include/utils/inet.h:27:23: note: at offset -1 into destination object 'ipaddr' of size 16  
This is due to a compiler bug:  
It has been a year since the bug has been reported without getting fixed. As  
the warnings are verbose and use of gcc 12 is becoming more common, it seems  
worth working around the bug. Particularly because a simple reformulation of  
the loop condition fixes the issue and isn't any less readable.  
Author: Tom Lane <>  
Author: Andres Freund <>  
Backpatch: 11-  

M src/backend/utils/adt/network.c

Small tidyup for commit d41a178b.

commit   : 6f508b8bce2ed66eef310e1b77a84ce1cd222aeb    
author   : Thomas Munro <>    
date     : Fri, 17 Mar 2023 09:44:42 +1300    
committer: Thomas Munro <>    
date     : Fri, 17 Mar 2023 09:44:42 +1300    

Click here for diff

A comment was left behind claiming that we needed to use malloc() rather  
than palloc() because the corresponding free would run in another  
thread, but that's not true anymore.  Remove that comment.  And, with  
the reason being gone, we might as well actually use palloc().  
Back-patch to supported releases, like d41a178b.  

M src/backend/postmaster/postmaster.c

Fix waitpid() emulation on Windows.

commit   : 8362884275b5ba0620b1edfff260078910159c98    
author   : Thomas Munro <>    
date     : Wed, 15 Mar 2023 13:17:18 +1300    
committer: Thomas Munro <>    
date     : Wed, 15 Mar 2023 13:17:18 +1300    

Click here for diff

Our waitpid() emulation didn't prevent a PID from being recycled by the  
OS before the call to waitpid().  The postmaster could finish up  
tracking more than one child process with the same PID, and confuse  
Fix, by moving the guts of pgwin32_deadchild_callback() into waitpid(),  
so that resources are released synchronously.  The process and PID  
continue to exist until we close the process handle, which only happens  
once we're ready to adjust our book-keeping of running children.  
This seems to explain a couple of failures on CI.  It had never been  
reported before, despite the code being as old as the Windows port.  
Perhaps Windows started recycling PIDs more rapidly, or perhaps timing  
changes due to commit 7389aad6 made it more likely to break.  
Thanks to Alexander Lakhin for analysis and Andres Freund for tracking  
down the root cause.  
Back-patch to all supported branches.  
Reported-by: Andres Freund <>  

M src/backend/postmaster/postmaster.c

Fix corner case bug in numeric to_char() some more.

commit   : 6d3a9a60f78557dc6ab170db074f9e74da539d93    
author   : Tom Lane <>    
date     : Tue, 14 Mar 2023 19:17:31 -0400    
committer: Tom Lane <>    
date     : Tue, 14 Mar 2023 19:17:31 -0400    

Click here for diff

The band-aid applied in commit f0bedf3e4 turns out to still need  
some work: it made sure we didn't set Np->last_relevant too small  
(to the left of the decimal point), but it didn't prevent setting  
it too large (off the end of the partially-converted string).  
This could result in fetching data beyond the end of the allocated  
space, which with very bad luck could cause a SIGSEGV, though  
I don't see any hazard of interesting memory disclosure.  
Per bug #17839 from Thiago Nunes.  The bug's pretty ancient,  
so back-patch to all supported versions.  

M src/backend/utils/adt/formatting.c
M src/test/regress/expected/numeric.out
M src/test/regress/sql/numeric.sql

Fix JSON error reporting for many cases of erroneous string values.

commit   : c25a929a6c8869a148b3ee064eb03ab1d3cb127d    
author   : Tom Lane <>    
date     : Mon, 13 Mar 2023 15:19:00 -0400    
committer: Tom Lane <>    
date     : Mon, 13 Mar 2023 15:19:00 -0400    

Click here for diff

The majority of error exit cases in json_lex_string() failed to  
set lex->token_terminator, causing problems for the error context  
reporting code: it would see token_terminator less than token_start  
and do something more or less nuts.  In v14 and up the end result  
could be as bad as a crash in report_json_context().  Older  
versions accidentally avoided that fate; but all versions produce  
error context lines that are far less useful than intended,  
because they'd stop at the end of the prior token instead of  
continuing to where the actually-bad input is.  
To fix, invent some macros that make it less notationally painful  
to do the right thing.  Also add documentation about what the  
function is actually required to do; and in >= v14, add an assertion  
in report_json_context about token_terminator being sufficiently  
far advanced.  
Per report from Nikolay Shaplov.  Back-patch to all supported  

M src/backend/utils/adt/json.c
M src/test/regress/expected/json_encoding.out
M src/test/regress/expected/json_encoding_1.out

Fix failure to detect some cases of improperly-nested aggregates.

commit   : 62a91a1b092606e55d8a9807d249ceda58feebb0    
author   : Tom Lane <>    
date     : Mon, 13 Mar 2023 12:40:28 -0400    
committer: Tom Lane <>    
date     : Mon, 13 Mar 2023 12:40:28 -0400    

Click here for diff

check_agg_arguments_walker() supposed that it needn't descend into  
the arguments of a lower-level aggregate function, but this is  
just wrong in the presence of multiple levels of sub-select.  The  
oversight would lead to executor failures on queries that should  
be rejected.  (Prior to v11, they actually were rejected, thanks  
to a "redundant" execution-time check.)  
Per bug #17835 from Anban Company.  Back-patch to all supported  

M src/backend/parser/parse_agg.c
M src/test/regress/expected/aggregates.out
M src/test/regress/sql/aggregates.sql

Fix inconsistent error handling for GSS encryption in PQconnectPoll()

commit   : 2bc36a56cbd15415f85f3364044b778b21b0504c    
author   : Michael Paquier <>    
date     : Mon, 13 Mar 2023 16:36:34 +0900    
committer: Michael Paquier <>    
date     : Mon, 13 Mar 2023 16:36:34 +0900    

Click here for diff

The error cases for TLS and GSS encryption were inconsistent.  After TLS  
fails, the connection is marked as dead and follow-up calls of  
PQconnectPoll() would return immediately, but GSS encryption was not  
doing that, so the connection would still have been allowed to enter the  
GSS handling code.  This was handled incorrectly when gssencmode was set  
to "require".  "prefer" was working correctly, and this could not happen  
under "disable" as GSS encryption would not be attempted.  
This commit makes the error handling of GSS encryption on par with TLS  
portion, fixing the case of gssencmode=require.  
Reported-by: Jacob Champion  
Author: Michael Paquier  
Reviewed-by: Jacob Champion, Stephen Frost  
Backpatch-through: 12  

M src/interfaces/libpq/fe-connect.c

Mark unsafe_tests module as not runnable with installcheck

commit   : 13196cc755982e9cbccf92be67e36d5480e73edc    
author   : Andrew Dunstan <>    
date     : Sun, 12 Mar 2023 09:00:32 -0400    
committer: Andrew Dunstan <>    
date     : Sun, 12 Mar 2023 09:00:32 -0400    

Click here for diff

This was an omission in the original creation of the module.  
Also slightly adjust some wording to avoid a double "is".  
Backpatch the non-meson piece of this to release 12, where the module  
was introduced.  

M src/test/modules/unsafe_tests/Makefile
M src/test/modules/unsafe_tests/README

Fix misbehavior in contrib/pg_trgm with an unsatisfiable regex.

commit   : 1279414bc613316d3cb7216790bc943d5af8be70    
author   : Tom Lane <>    
date     : Sat, 11 Mar 2023 12:15:41 -0500    
committer: Tom Lane <>    
date     : Sat, 11 Mar 2023 12:15:41 -0500    

Click here for diff

If the regex compiler can see that a regex is unsatisfiable  
(for example, '$foo') then it may emit an NFA having no arcs.  
pg_trgm's packGraph function did the wrong thing in this case;  
it would access off the end of a work array, and with bad luck  
could produce a corrupted output data structure causing more  
problems later.  This could end with wrong answers or crashes  
in queries using a pg_trgm GIN or GiST index with such a regex.  
Fix by not trying to de-duplicate if there aren't at least 2 arcs.  
Per bug #17830 from Alexander Lakhin.  Back-patch to all supported  

M contrib/pg_trgm/expected/pg_word_trgm.out
M contrib/pg_trgm/sql/pg_word_trgm.sql
M contrib/pg_trgm/trgm_regexp.c

Ensure COPY TO on an RLS-enabled table copies no more than it should.

commit   : a30310833d071cfe9c1e7a9768e4d4df47685106    
author   : Tom Lane <>    
date     : Fri, 10 Mar 2023 13:52:28 -0500    
committer: Tom Lane <>    
date     : Fri, 10 Mar 2023 13:52:28 -0500    

Click here for diff

The COPY documentation is quite clear that "COPY relation TO" copies  
rows from only the named table, not any inheritance children it may  
have.  However, if you enabled row-level security on the table then  
this stopped being true, because the code forgot to apply the ONLY  
modifier in the "SELECT ... FROM relation" query that it constructs  
in order to allow RLS predicates to be attached.  Fix that.  
Report and patch by Antonin Houska (comment adjustments and test case  
by me).  Back-patch to all supported branches.  

M src/backend/commands/copy.c
M src/test/regress/expected/rowsecurity.out
M src/test/regress/sql/rowsecurity.sql


commit   : e30fd0942493b1ba260b122c5ae4d8941926eb8f    
author   : Thomas Munro <>    
date     : Thu, 9 Mar 2023 16:33:24 +1300    
committer: Thomas Munro <>    
date     : Thu, 9 Mar 2023 16:33:24 +1300    

Click here for diff

Commit bdaabb9b started skipping doomed transactions when building the  
list of possible conflicts for SERIALIZABLE READ ONLY.  That makes  
sense, because doomed transactions won't commit, but a couple of subtle  
things broke:  
1.  If all uncommitted r/w transactions are doomed, a READ ONLY  
transaction would arbitrarily not benefit from the safe snapshot  
optimization.  It would not be taken immediately, and yet no other  
transaction would set SXACT_FLAG_RO_SAFE later.  
2.  In the same circumstances but with DEFERRABLE, GetSafeSnapshot()  
would correctly exit its wait loop without sleeping and then take the  
optimization in non-assert builds, but assert builds would fail a sanity  
check that SXACT_FLAG_RO_SAFE had been set by another transaction.  
This is similar to the case for PredXact->WritableSxactCount == 0.  We  
should opt out immediately if our possibleUnsafeConflicts list is empty  
after filtering.  
The code to maintain the serializable global xmin is moved down below  
the new opt out site, because otherwise we'd have to reverse its effects  
before returning.  
Back-patch to all supported releases.  Bug #17368.  
Reported-by: Alexander Lakhin <>  

M src/backend/storage/lmgr/predicate.c

Fix corruption due to vacuum_defer_cleanup_age underflowing 64bit xids

commit   : 3c92f7e9d851084bf51cb9231353c54474fe0438    
author   : Andres Freund <>    
date     : Tue, 7 Mar 2023 21:36:52 -0800    
committer: Andres Freund <>    
date     : Tue, 7 Mar 2023 21:36:52 -0800    

Click here for diff

When vacuum_defer_cleanup_age is bigger than the current xid, including the  
epoch, the subtraction of vacuum_defer_cleanup_age would lead to a wrapped  
around xid. While that normally is not a problem, the subsequent conversion to  
a 64bit xid results in a 64bit-xid very far into the future. As that xid is  
used as a horizon to detect whether rows versions are old enough to be  
removed, that allows removal of rows that are still visible (i.e. corruption).  
If vacuum_defer_cleanup_age was never changed from the default, there is no  
chance of this bug occurring.  
This bug was introduced in dc7420c2c92.  A lesser version of it exists in  
12-13, introduced by fb5344c969a, affecting only GiST.  
The 12-13 version of the issue can, in rare cases, lead to pages in a gist  
index getting recycled too early, potentially causing index entries to be  
found multiple times.  
The fix is fairly simple - don't allow vacuum_defer_cleanup_age to retreat  
further than FirstNormalTransactionId.  
Patches to make similar bugs easier to find, by adding asserts to the 64bit  
xid infrastructure, have been proposed, but are not suitable for backpatching.  
Currently there are no tests for vacuum_defer_cleanup_age. A patch introducing  
infrastructure to make writing a test easier has been posted to the list.  
Reported-by: Michail Nikolaev <>  
Reviewed-by: Matthias van de Meent <>  
Author: Andres Freund <>  
Backpatch: 12-, but impact/fix is smaller for 12-13  

M src/backend/utils/time/snapmgr.c

Fix more bugs caused by adding columns to the end of a view.

commit   : 5a19da58eed20b5259ad5d6ae53f54eea08d34c9    
author   : Tom Lane <>    
date     : Tue, 7 Mar 2023 18:21:37 -0500    
committer: Tom Lane <>    
date     : Tue, 7 Mar 2023 18:21:37 -0500    

Click here for diff

If a view is defined atop another view, and then CREATE OR REPLACE  
VIEW is used to add columns to the lower view, then when the upper  
view's referencing RTE is expanded by ApplyRetrieveRule we will have  
a subquery RTE with fewer eref->colnames than output columns.  This  
confuses various code that assumes those lists are always in sync,  
as they are in plain parser output.  
We have seen such problems before (cf commit d5b760ecb), and now  
I think the time has come to do what was speculated about in that  
commit: let's make ApplyRetrieveRule synthesize some column names to  
preserve the invariant that holds in parser output.  Otherwise we'll  
be chasing this class of bugs indefinitely.  Moreover, it appears from  
testing that this actually gives us better results in the test case  
d5b760ecb added, and likely in other corner cases that we lack  
coverage for.  
In HEAD, I replaced d5b760ecb's hack to make expandRTE exit early with  
an elog(ERROR) call, since the case is now presumably unreachable.  
But it seems like changing that in back branches would bring more risk  
than benefit, so there I just updated the comment.  
Per bug #17811 from Alexander Lakhin.  Back-patch to all supported  

M src/backend/parser/parse_relation.c
M src/backend/rewrite/rewriteHandler.c
M src/test/regress/expected/alter_table.out
M src/test/regress/sql/alter_table.sql

Fix some more cases of missed GENERATED-column updates.

commit   : 23b75dd03da1a4a6db080b27bb3c8efcf7dbc9ae    
author   : Tom Lane <>    
date     : Mon, 6 Mar 2023 18:31:16 -0500    
committer: Tom Lane <>    
date     : Mon, 6 Mar 2023 18:31:16 -0500    

Click here for diff

If UPDATE is forced to retry after an EvalPlanQual check, it neglected  
to repeat GENERATED-column computations, even though those might well  
have changed since we're dealing with a different tuple than before.  
Fixing this is mostly a matter of looping back a bit further when  
we retry.  In v15 and HEAD that's most easily done by altering the API  
of ExecUpdateAct so that it includes computing GENERATED expressions.  
Also, if an UPDATE in a partitioned table turns into a cross-partition  
INSERT operation, we failed to recompute GENERATED columns.  That's a  
bug since 8bf6ec3ba allowed partitions to have different generation  
expressions; although it seems to have no ill effects before that.  
Fixing this is messier because we can now have situations where the same  
query needs both the UPDATE-aligned set of GENERATED columns and the  
INSERT-aligned set, and it's unclear which set will be generated first  
(else we could hack things by forcing the INSERT-aligned set to be  
generated, which is indeed how fe9e658f4 made it work for MERGE).  
The best fix seems to be to build and store separate sets of expressions  
for the INSERT and UPDATE cases.  That would create ABI issues in the  
back branches, but so far it seems we can leave this alone in the back  
Per bug #17823 from Hisahiro Kauchi.  The first part of this affects all  
branches back to v12 where GENERATED columns were added.  

M src/backend/executor/nodeModifyTable.c
M src/test/isolation/expected/eval-plan-qual.out
M src/test/isolation/specs/eval-plan-qual.spec
M src/test/regress/expected/generated.out
M src/test/regress/sql/generated.sql

Fix assert failures in parallel SERIALIZABLE READ ONLY.

commit   : afa122e41c651edfaa17b47652025ea48085eb94    
author   : Thomas Munro <>    
date     : Mon, 6 Mar 2023 15:07:15 +1300    
committer: Thomas Munro <>    
date     : Mon, 6 Mar 2023 15:07:15 +1300    

Click here for diff

1.  Make sure that we don't decrement SxactGlobalXminCount twice when  
the SXACT_FLAG_RO_SAFE optimization is reached in a parallel query.  
This could trigger a sanity check failure in assert builds.  Non-assert  
builds recompute the count in SetNewSxactGlobalXmin(), so the problem  
was hidden, explaining the lack of field reports.  Add a new isolation  
test to exercise that case.  
2.  Remove an assertion that the DOOMED flag can't be set on a partially  
released SERIALIZABLEXACT.  Instead, ignore the flag (our transaction  
was already determined to be read-only safe, and DOOMED is in fact set  
during partial release, and there was already an assertion that it  
wasn't set sooner).  Improve an existing isolation test so that it  
reaches that case (previously it wasn't quite testing what it was  
supposed to be testing; see discussion).  
Back-patch to 12.  Bug #17116.  Defects in commit 47a338cf.  
Reported-by: Alexander Lakhin <>  

M src/backend/storage/lmgr/predicate.c
M src/test/isolation/expected/serializable-parallel-2.out
A src/test/isolation/expected/serializable-parallel-3.out
M src/test/isolation/isolation_schedule
M src/test/isolation/specs/serializable-parallel-2.spec
A src/test/isolation/specs/serializable-parallel-3.spec

Avoid fetching one past the end of translate()'s "to" parameter.

commit   : b162660d3ac44688f18919cd460423022e467512    
author   : Tom Lane <>    
date     : Wed, 1 Mar 2023 11:30:17 -0500    
committer: Tom Lane <>    
date     : Wed, 1 Mar 2023 11:30:17 -0500    

Click here for diff

This is usually harmless, but if you were very unlucky it could  
provoke a segfault due to the "to" string being right up against  
the end of memory.  Found via valgrind testing (so we might've  
found it earlier, except that our regression tests lacked any  
exercise of translate()'s deletion feature).  
Fix by switching the order of the test-for-end-of-string and  
advance-pointer steps.  While here, compute "to_ptr + tolen"  
just once.  (Smarter compilers might figure that out for  
themselves, but let's just make sure.)  
Report and fix by Daniil Anisimov, in bug #17816.  

M src/backend/utils/adt/oracle_compat.c
M src/test/regress/expected/strings.out
M src/test/regress/sql/strings.sql

Don't force SQL_ASCII/no-locale for installcheck in

commit   : 11290c89bbe52283186b3bd38f06ae677d99ca9f    
author   : Andrew Dunstan <>    
date     : Sun, 26 Feb 2023 06:48:41 -0500    
committer: Andrew Dunstan <>    
date     : Sun, 26 Feb 2023 06:48:41 -0500    

Click here for diff

It's been this way for a very long time, but it appears to have been  
masking an issue that only manifests with different settings. Therefore,  
run the tests in the installation's default encoding/locale.  
Backpatch to all live branches.  

M src/tools/msvc/

commit   : 904b171a465583b35ba199d38868e9e49fcb8ef4    
author   : Tom Lane <>    
date     : Sat, 25 Feb 2023 14:44:14 -0500    
committer: Tom Lane <>    
date     : Sat, 25 Feb 2023 14:44:14 -0500    

Click here for diff

We already tried to fix this in commits 3f7323cbb et al (and follow-on  
fixes), but now it emerges that there are still unfixed cases;  
moreover, these cases affect all branches not only pre-v14.  I thought  
we had eliminated all cases of making multiple clones of an UPDATE's  
target list when we nuked inheritance_planner.  But it turns out we  
still do that in some partitioned-UPDATE cases, notably including  
INSERT ... ON CONFLICT UPDATE, because ExecInitPartitionInfo thinks  
it's okay to clone and modify the parent's targetlist.  
This fix is based on a suggestion from Andres Freund: let's stop  
abusing the ParamExecData.execPlan mechanism, which was only ever  
meant to handle initplans, and instead solve the execution timing  
problem by having the expression compiler move MULTIEXPR_SUBLINK steps  
to the front of their expression step lists.  This is feasible because  
(a) all branches still in support compile the entire targetlist of  
an UPDATE into a single ExprState, and (b) we know that all  
MULTIEXPR_SUBLINKs do need to be evaluated --- none could be buried  
inside a CASE, for example.  There is a minor semantics change  
concerning the order of execution of the MULTIEXPR's subquery versus  
other parts of the parent targetlist, but that seems like something  
we can get away with.  By doing that, we no longer need to worry  
about whether different clones of a MULTIEXPR_SUBLINK share output  
Params; their usage of that data structure won't overlap.  
Per bug #17800 from Alexander Lakhin.  Back-patch to all supported  
branches.  In v13 and earlier, we can revert 3f7323cbb and follow-on  
fixes; however, I chose to keep the SubPlan.subLinkId field added  
in ccbb54c72.  We don't need that anymore in the core code, but it's  
cheap enough to fill, and removing a plan node field in a minor  
release seems like it'd be asking for trouble.  
Andres Freund and Tom Lane  

M src/backend/executor/execExpr.c
M src/backend/executor/nodeSubplan.c
M src/backend/optimizer/plan/planner.c
M src/backend/optimizer/plan/subselect.c
M src/include/nodes/primnodes.h
M src/include/optimizer/subselect.h
M src/test/regress/expected/inherit.out
M src/test/regress/sql/inherit.sql

Fix mishandling of OLD/NEW references in subqueries in rule actions.

commit   : 4fd093af7186e9e3bad805e580edd1991f8f3350    
author   : Dean Rasheed <>    
date     : Sat, 25 Feb 2023 14:47:03 +0000    
committer: Dean Rasheed <>    
date     : Sat, 25 Feb 2023 14:47:03 +0000    

Click here for diff

If a rule action contains a subquery that refers to columns from OLD  
or NEW, then those are really lateral references, and the planner will  
complain if it sees such things in a subquery that isn't marked as  
lateral. However, at rule-definition time, the user isn't required to  
mark the subquery with LATERAL, and so it can fail when the rule is  
Fix this by marking such subqueries as lateral in the rewriter, at the  
point where they're used.  
Dean Rasheed and Tom Lane, per report from Alexander Lakhin.  
Back-patch to all supported branches.  

M src/backend/rewrite/rewriteHandler.c
M src/test/regress/expected/rules.out
M src/test/regress/sql/rules.sql

Don't repeatedly register cache callbacks in pgoutput plugin.

commit   : 95558bc8ff89c5887f1bffc9d152ca603637e2c0    
author   : Tom Lane <>    
date     : Thu, 23 Feb 2023 15:40:28 -0500    
committer: Tom Lane <>    
date     : Thu, 23 Feb 2023 15:40:28 -0500    

Click here for diff

Multiple cycles of starting up and shutting down the plugin within a  
single session would eventually lead to "out of relcache_callback_list  
slots", because pgoutput_startup blindly re-registered its cache  
callbacks each time.  Fix it to register them only once, as all other  
users of cache callbacks already take care to do.  
This has been broken all along, so back-patch to all supported branches.  
Shi Yu  

M src/backend/replication/pgoutput/pgoutput.c

Fix multi-row DEFAULT handling for INSERT ... SELECT rules.

commit   : 98b83b7349821b05134e6f50f516ecac878cb91d    
author   : Dean Rasheed <>    
date     : Thu, 23 Feb 2023 10:57:46 +0000    
committer: Dean Rasheed <>    
date     : Thu, 23 Feb 2023 10:57:46 +0000    

Click here for diff

Given an updatable view with a DO ALSO INSERT ... SELECT rule, a  
multi-row INSERT ... VALUES query on the view fails if the VALUES list  
contains any DEFAULTs that are not replaced by view defaults. This  
manifests as an "unrecognized node type" error, or an Assert failure,  
in an assert-enabled build.  
The reason is that when RewriteQuery() attempts to replace the  
remaining DEFAULT items with NULLs in any product queries, using  
rewriteValuesRTEToNulls(), it assumes that the VALUES RTE is located  
at the same rangetable index in each product query. However, if the  
product query is an INSERT ... SELECT, then the VALUES RTE is actually  
in the SELECT part of that query (at the same index), rather than the  
top-level product query itself.  
Fix, by descending to the SELECT in such cases. Note that we can't  
simply use getInsertSelectQuery() for this, since that expects to be  
given a raw rule action with OLD and NEW placeholder entries, so we  
duplicate its logic instead.  
While at it, beef up the checks in getInsertSelectQuery() by checking  
that the jointree->fromlist node is indeed a RangeTblRef, and that the  
RTE it points to has rtekind == RTE_SUBQUERY.  
Per bug #17803, from Alexander Lakhin. Back-patch to all supported  
Dean Rasheed, reviewed by Tom Lane.  

M src/backend/rewrite/rewriteHandler.c
M src/backend/rewrite/rewriteManip.c
M src/test/regress/expected/updatable_views.out
M src/test/regress/sql/updatable_views.sql

Fix snapshot handling in logicalmsg_decode

commit   : 497f863f05982c193c12a115f00be6efa7214b29    
author   : Tomas Vondra <>    
date     : Wed, 22 Feb 2023 15:24:09 +0100    
committer: Tomas Vondra <>    
date     : Wed, 22 Feb 2023 15:24:09 +0100    

Click here for diff

Whe decoding a transactional logical message, logicalmsg_decode called  
SnapBuildGetOrBuildSnapshot. But we may not have a consistent snapshot  
yet at that point. We don't actually need the snapshot in this case  
(during replay we'll have the snapshot from the transaction), so in  
practice this is harmless. But in assert-enabled build this crashes.  
Fixed by requesting the snapshot only in non-transactional case, where  
we are guaranteed to have SNAPBUILD_CONSISTENT.  
Backpatch to 11. The issue exists since 9.6.  
Backpatch-through: 11  
Reviewed-by: Andres Freund  

M src/backend/replication/logical/decode.c
M src/backend/replication/logical/reorderbuffer.c

Add missing support for the latest SPI status codes.

commit   : 52dbd9f845987ff3a6f97d30b3bebb13fdb4b2b4    
author   : Dean Rasheed <>    
date     : Wed, 22 Feb 2023 13:28:30 +0000    
committer: Dean Rasheed <>    
date     : Wed, 22 Feb 2023 13:28:30 +0000    

Click here for diff

SPI_result_code_string() was missing support for SPI_OK_TD_REGISTER,  
and in v15 and later, it was missing support for SPI_OK_MERGE, as was  
The last of those would trigger an error if a MERGE was executed from  
PL/Tcl. The others seem fairly innocuous, but worth fixing.  
Back-patch to all supported branches. Before v15, this is just adding  
SPI_OK_TD_REGISTER to SPI_result_code_string(), which is unlikely to  
be seen by anyone, but seems worth doing for completeness.  
Reviewed by Tom Lane.  

M src/backend/executor/spi.c

Fix erroneous Valgrind markings in AllocSetRealloc.

commit   : 463bef38332efaef39de22e4325688924a934b76    
author   : Tom Lane <>    
date     : Tue, 21 Feb 2023 18:47:47 -0500    
committer: Tom Lane <>    
date     : Tue, 21 Feb 2023 18:47:47 -0500    

Click here for diff

If asked to decrease the size of a large (>8K) palloc chunk,  
AllocSetRealloc could improperly change the Valgrind state of memory  
beyond the new end of the chunk: it would mark data UNDEFINED as far  
as the old end of the chunk after having done the realloc(3) call,  
thus tromping on the state of memory that no longer belongs to it.  
One would normally expect that memory to now be marked NOACCESS,  
so that this mislabeling might prevent detection of later errors.  
If realloc() had chosen to move the chunk someplace else (unlikely,  
but well within its rights) we could also mismark perfectly-valid  
DEFINED data as UNDEFINED, causing false-positive valgrind reports  
later.  Also, any malloc bookkeeping data placed within this area  
might now be wrongly marked, causing additional problems.  
Fix by replacing relevant uses of "oldsize" with "Min(size, oldsize)".  
It's sufficient to mark as far as "size" when that's smaller, because  
whatever remains in the new chunk size will be marked NOACCESS below,  
and we expect realloc() to have taken care of marking the memory  
beyond the new official end of the chunk.  
While we're here, also rename the function's "oldsize" variable  
to "oldchksize" to more clearly explain what it actually holds,  
namely the distance to the end of the chunk (that is, requested size  
plus trailing padding).  This is more consistent with the use of  
"size" and "chksize" to hold the new requested size and chunk size.  
Add a new variable "oldsize" in the one stanza where we're actually  
talking about the old requested size.  
Oversight in commit c477f3e44.  Back-patch to all supported branches,  
as that was, just in case anybody wants to do valgrind testing on back  
Karina Litskevich  

M src/backend/utils/mmgr/aset.c

Print the correct aliases for DML target tables in ruleutils.

commit   : 3dd287c14facd5ee17e386175752a75ce16a1daa    
author   : Tom Lane <>    
date     : Fri, 17 Feb 2023 16:40:34 -0500    
committer: Tom Lane <>    
date     : Fri, 17 Feb 2023 16:40:34 -0500    

Click here for diff

ruleutils.c blindly printed the user-given alias (or nothing if there  
hadn't been one) for the target table of INSERT/UPDATE/DELETE queries.  
That works a large percentage of the time, but not always: for queries  
appearing in WITH, it's possible that we chose a different alias to  
avoid conflict with outer-scope names.  Since the chosen alias would  
be used in any Var references to the target table, this'd lead to an  
inconsistent printout with consequences such as dump/restore failures.  
The correct logic for printing (or not) a relation alias was embedded  
in get_from_clause_item.  Factor it out to a separate function so that  
we don't need a jointree node to use it.  (Only a limited part of that  
function can be reached from these new call sites, but this seems like  
the cleanest non-duplicative factorization.)  
In passing, I got rid of a redundant "\d+ rules_src" step in rules.sql.  
Initial report from Jonathan Katz; thanks to Vignesh C for analysis.  
This has been broken for a long time, so back-patch to all supported  

M src/backend/utils/adt/ruleutils.c
M src/test/regress/expected/rules.out
M src/test/regress/sql/rules.sql

Fix handling of SCRAM-SHA-256's channel binding with RSA-PSS certificates

commit   : a40e7b75e689c3f7f9c9c77106a1ff59fa61d938    
author   : Michael Paquier <>    
date     : Wed, 15 Feb 2023 10:12:38 +0900    
committer: Michael Paquier <>    
date     : Wed, 15 Feb 2023 10:12:38 +0900    

Click here for diff

OpenSSL 1.1.1 and newer versions have added support for RSA-PSS  
certificates, which requires the use of a specific routine in OpenSSL to  
determine which hash function to use when compiling it when using  
channel binding in SCRAM-SHA-256.  X509_get_signature_nid(), that is the  
original routine the channel binding code has relied on, is not able to  
determine which hash algorithm to use for such certificates.  However,  
X509_get_signature_info(), new to OpenSSL 1.1.1, is able to do it.  This  
commit switches the channel binding logic to rely on  
X509_get_signature_info() over X509_get_signature_nid(), which would be  
the choice when building with 1.1.1 or newer.  
The error could have been triggered on the client or the server, hence  
libpq and the backend need to have their related code paths patched.  
Note that attempting to load an RSA-PSS certificate with OpenSSL 1.1.0  
or older leads to a failure due to an unsupported algorithm.  
The discovery of relying on X509_get_signature_info() comes from Jacob,  
the tests have been written by Heikki (with few tweaks from me), while I  
have bundled the whole together while adding the bits needed for MSVC  
and meson.  
This issue exists since channel binding exists, so backpatch all the way  
down.  Some tests are added in 15~, triggered if compiling with OpenSSL  
1.1.1 or newer, where the certificate and key files can easily be  
generated for RSA-PSS.  
Reported-by: Gunnar "Nick" Bluth  
Author: Jacob Champion, Heikki Linnakangas  
Backpatch-through: 11  

M configure
M src/backend/libpq/be-secure-openssl.c
M src/include/libpq/libpq-be.h
M src/include/
M src/interfaces/libpq/fe-secure-openssl.c
M src/interfaces/libpq/libpq-int.h
M src/tools/msvc/

Disable WindowAgg inverse transitions when subplans are present

commit   : ac55abd33537f5ac38563826bd9423f961ac66f0    
author   : David Rowley <>    
date     : Mon, 13 Feb 2023 17:08:46 +1300    
committer: David Rowley <>    
date     : Mon, 13 Feb 2023 17:08:46 +1300    

Click here for diff

When an aggregate function is used as a WindowFunc and a tuple transitions  
out of the window frame, we ordinarily try to make use of the aggregate  
function's inverse transition function to "unaggregate" the exiting tuple.  
This optimization is disabled for various cases, including when the  
aggregate contains a volatile function.  In such a case we'd be unable to  
ensure that the transition value was calculated to the same value during  
transitions and inverse transitions.  Unfortunately, we did this check by  
calling contain_volatile_functions() which does not recursively search  
SubPlans for volatile functions.  If the aggregate function's arguments or  
its FILTER clause contained a subplan with volatile functions then we'd  
fail to notice this.  
Here we fix this by just disabling the optimization when the WindowFunc  
contains any subplans.  Volatile functions are not the only reason that a  
subplan may have nonrepeatable results.  
Bug: #17777  
Reported-by: Anban Company  
Reviewed-by: Tom Lane  
Backpatch-through: 11  

M src/backend/executor/nodeWindowAgg.c

Stop recommending auto-download of DTD files, and indeed disable it.

commit   : 11f1f9f4fa309d2592acd71de01765a333a435bb    
author   : Tom Lane <>    
date     : Wed, 8 Feb 2023 17:15:23 -0500    
committer: Tom Lane <>    
date     : Wed, 8 Feb 2023 17:15:23 -0500    

Click here for diff

It appears no longer possible to build the SGML docs without a local  
installation of the DocBook DTD, because now only  
permits HTTPS access, and no common version of xsltproc supports that.  
Hence, remove the bits of our documentation suggesting that that's  
possible or useful.  
In fact, we might as well add the --nonet option to the build recipes  
automatically, for a bit of extra security.  
Also fix our documentation-tool-installation recipes for macOS to  
ensure that xmllint and xsltproc are pulled in from MacPorts or  
Homebrew.  The previous recipes assumed you could use the  
Apple-supplied versions of these tools; which still works, except that  
you'd need to set an environment variable to ensure that they would  
find DTD files provided by those package managers.  Simpler and easier  
to just recommend pulling in the additional packages.  
In HEAD, also document how to build docs using Meson, and adjust  
"ninja docs" to just build the HTML docs, for consistency with the  
default behavior of doc/src/sgml/Makefile.  
In a fit of neatnik-ism, I also made the ordering of the package  
lists match the order in which the tools are described at the head  
of the appendix.  
Aleksander Alekseev, Peter Eisentraut, Tom Lane  

M doc/src/sgml/Makefile
M doc/src/sgml/docguide.sgml
M doc/src/sgml/images/Makefile

Backpatch OpenSSL 3.0.0 compatibility in tests

commit   : 6133a0f4c7c39c9490b5aef91efba76ce83c5a02    
author   : Peter Eisentraut <>    
date     : Fri, 5 Jun 2020 11:18:11 +0200    
committer: Andrew Dunstan <>    
date     : Fri, 5 Jun 2020 11:18:11 +0200    

Click here for diff

backport of commit f0d2c65f17 to releases 11 and 12  
This means the SSL tests will fail on machines with extremely old  
versions of OpenSSL, but we don't know of anything trying to run such  
tests. The ability to build is not affected.  

M src/test/ssl/Makefile
M src/test/ssl/ssl/server-password.key

Make EXEC_BACKEND more convenient on Linux and FreeBSD.

commit   : 6b4dba711a4ec4be87850108d4f9db12eecd399e    
author   : Michael Paquier <>    
date     : Wed, 8 Feb 2023 13:09:52 +0900    
committer: Michael Paquier <>    
date     : Wed, 8 Feb 2023 13:09:52 +0900    

Click here for diff

Try to disable ASLR when building in EXEC_BACKEND mode, to avoid random  
memory mapping failures while testing.  For developer use only, no  
effect on regular builds.  
This has been originally applied as of f3e7806 for v15~, but  
recently-added buildfarm member gokiburi tests this configuration on  
older branches as well, causing it to fail randomly as ASLR would be  
Suggested-by: Andres Freund <>  
Tested-by: Bossart, Nathan <>  
Backpatch-through: 12  

M configure
M src/bin/pg_ctl/pg_ctl.c
M src/common/exec.c
M src/include/
M src/include/port.h
M src/test/regress/pg_regress.c