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ab8c84db2f
When replacing rd_indexlist, rd_indexattr, etc, we neglected to pfree any
old value of these fields. Under ordinary circumstances, the old value
would always be NULL, so this seemed reasonable enough. However, in cases
where we're rebuilding a system catalog's relcache entry and another cache
flush occurs on that same catalog meanwhile, it's possible for the field to
not be NULL when we return to the outer level, because we already refilled
it while recovering from the inner flush. This leads to a fairly small
session-lifespan leak in CacheMemoryContext. In real-world usage the leak
would be too small to notice; but in testing with CLOBBER_CACHE_RECURSIVELY
the leakage can add up to the point of causing OOM failures, as reported by
Tomas Vondra.
The issue has been there a long time, but it only seems worth fixing in
HEAD, like the previous fix in this area (commit
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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/.