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e89526d4f3
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Tom Lane e89526d4f3 In B-tree page deletion, clean up properly after page deletion failure. 
In _bt_unlink_halfdead_page(), we might fail to find an immediate left
sibling of the target page, perhaps because of corruption of the page
sibling links.  The code intends to cope with this by just abandoning
the deletion attempt; but what actually happens is that it fails outright
due to releasing the same buffer lock twice.  (And error recovery masks
a second problem, which is possible leakage of a pin on another page.)
Seems to have been introduced by careless refactoring in commit efada2b8e.
Since there are multiple cases to consider, let's make releasing the buffer
lock in the failure case the responsibility of _bt_unlink_halfdead_page()
not its caller.

Also, avoid fetching the leaf page's left-link again after we've dropped
lock on the page.  This is probably harmless, but it's not exactly good
coding practice.

Per report from Kyotaro Horiguchi.  Back-patch to 9.4 where the faulty code
was introduced.

Discussion: <20160803.173116.111915228.horiguchi.kyotaro@lab.ntt.co.jp>
2016-08-06 14:28:37 -04:00
config Update config.guess and config.sub 2016-05-06 14:02:44 -04:00
contrib Fix assorted fallout from IS [NOT] NULL patch. 2016-07-28 16:09:15 -04:00
doc Make array_to_tsvector() sort and de-duplicate the given strings. 2016-08-05 16:09:06 -04:00
src In B-tree page deletion, clean up properly after page deletion failure. 2016-08-06 14:28:37 -04:00
.dir-locals.el emacs: Set indent-tabs-mode in perl-mode 2015-04-12 23:53:23 -04:00
.gitattributes Fix whitespace and remove obsolete gitattributes entry 2016-03-13 16:03:13 -04:00
.gitignore Add .gitignore entries for AIX-specific intermediate build artifacts. 2015-07-08 20:44:22 -04:00
aclocal.m4 Replace our hacked version of ax_pthread.m4 with latest upstream version. 2015-07-08 20:36:06 +03:00
configure Stamp 9.6beta3. 2016-07-18 16:54:26 -04:00
configure.in Stamp 9.6beta3. 2016-07-18 16:54:26 -04:00
COPYRIGHT Update copyright for 2016 2016-01-02 13:33:40 -05:00
GNUmakefile.in Fix distclean/maintainer-clean targets to remove top-level tmp_install dir. 2015-05-13 18:48:05 -04:00
HISTORY
Makefile
README
README.git

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:

	http://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
http://www.postgresql.org/download/.  For more information look at our
web site located at http://www.postgresql.org/.