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In such cases, get_xid_status() doesn't set its output parameter (the third argument), so we shouldn't fall through to code which will test the value of that parameter. There are five existing calls to get_xid_status(), three of which seem to already handle this case properly. This commit tries to fix the other two. If we're checking xmin and find that it is invalid (i.e. 0) just report that as corruption, similar to what's already done in the three cases that seem correct. If we're checking xmax and find that's invalid, that's fine: it just means that the tuple hasn't been updated or deleted. Thanks to Andres Freund and valgrind for finding this problem, and also to Andres for having a look at the patch. This bug seems to go all the way back to where verify_heapam was first introduced, but wasn't detected until recently, possibly because of the new test cases added for update chain verification. Back-patch to v14, where this code showed up. Discussion: http://postgr.es/m/CA+TgmoZAYzQZqyUparXy_ks3OEOfLD9-bEXt8N-2tS1qghX9gQ@mail.gmail.com
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/.