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Tom Lane 57868d957e Avoid crash when rolling back within a prepared statement. 
If a portal is used to run a prepared CALL or DO statement that
contains a ROLLBACK, PortalRunMulti fails because the portal's
statement list gets cleared by the rollback.  (Since the grammar
doesn't allow CALL/DO in PREPARE, the only easy way to get to this is
via extended query protocol, which treats all inputs as prepared
statements.)  It's difficult to avoid resetting the portal early
because of resource-management issues, so work around this by teaching
PortalRunMulti to be wary of portal->stmts having suddenly become NIL.

The crash has only been seen to occur in v13 and HEAD (as a
consequence of commit 1cff1b95a having added an extra touch of
portal->stmts).  But even before that, the code involved touching a
List that the portal no longer has any claim on.  In the test case at
hand, the List will still exist because of another refcount on the
cached plan; but I'm far from convinced that it's impossible for the
cached plan to have been dropped by the time control gets back to
PortalRunMulti.  Hence, backpatch to v11 where nested transactions
were added.

Thomas Munro and Tom Lane, per bug #16811 from James Inform

Discussion: https://postgr.es/m/16811-c1b599b2c6c2d622@postgresql.org
2021-02-03 19:38:29 -05:00
config jit: configure: Explicitly reference 'native' component. 2020-12-07 18:32:56 -08:00
contrib Fix ancient memory leak in contrib/auto_explain. 2021-02-02 13:49:08 -05:00
doc Doc: work a little harder on the initial examples for regex matching. 2021-02-01 16:38:52 -05:00
src Avoid crash when rolling back within a prepared statement. 2021-02-03 19:38:29 -05:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.gitattributes gitattributes: Add new file 2019-11-12 08:13:55 +01:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
aclocal.m4 Remove configure-time probe for DocBook DTD. 2020-11-30 15:24:13 -05:00
configure jit: configure: Explicitly reference 'native' component. 2020-12-07 18:32:56 -08:00
configure.in Remove configure-time probe for DocBook DTD. 2020-11-30 15:24:13 -05:00
COPYRIGHT Update copyright for 2021 2021-01-02 13:06:24 -05:00
GNUmakefile.in Make install-tests target work with vpath builds 2020-05-31 18:33:00 -04:00
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README Canonicalize some URLs 2020-02-10 20:47:50 +01:00
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README 

PostgreSQL Database Management System
=====================================

This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains C language bindings.

PostgreSQL has many language interfaces, many of which are listed here:

	https://www.postgresql.org/download/

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

The latest version of this software may be obtained at
https://www.postgresql.org/download/.  For more information look at our
web site located at https://www.postgresql.org/.