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5beb73b495
Despite the argumentation I wrote in commit 7a2fe85b0, it's unsafe to do this, because in corner cases it's possible for HeapTupleSatisfiesSelf to try to set hint bits on the target tuple; and at least since 8.2 we have required the buffer content lock to be held while setting hint bits. The added regression test exercises one such corner case. Unpatched, it causes an assertion failure in assert-enabled builds, or otherwise would cause a hint bit change in a buffer we don't hold lock on, which given the right race condition could result in checksum failures or other data consistency problems. The odds of a problem in the field are probably pretty small, but nonetheless back-patch to all supported branches. Report: <19391.1477244876@sss.pgh.pa.us>
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/.