850e1a566e
In 9.1 and earlier, it is possible for index_getnext() to try to examine a heap buffer for possible HOT-prune when in recovery; this causes a problem when a multixact is found in a tuple's Xmax, because GetMultiXactIdMembers refuses to run when in recovery, raising an error: ERROR: cannot GetMultiXactIdMembers() during recovery This can be solved easily by having MultiXactIdIsRunning always return false when in recovery, which is reasonable because a HOT standby cannot acquire further tuple locks nor update/delete tuples. (Note: it doesn't look like this specific code path has a problem in 9.2, because instead of doing HeapTupleSatisfiesUpdate directly, heap_hot_search_buffer uses HeapTupleIsSurelyDead instead. Still, there may be other paths affected by the same bug, for instance in pgrowlocks, and the multixact code hasn't changed; so apply the same fix throughout.) Apply this fix to 9.0 through 9.2. In 9.3 the multixact code has been changed completely and is no longer subject to this problem. Per report from Marko Tiikkaja, https://www.postgresql.org/message-id/54EB3283.2080305@joh.to Analysis by Andres Freund
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/.