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It's possible that if the only live partition is concurrently dropped and try_table_open() fails, that the bms_del_member() will pfree the live_parts Bitmapset. Since the bms_del_member() call does not assign the result back to the live_parts local variable, the while loop could segfault as that variable would still reference the pfree'd Bitmapset. Backpatch to 15.52f3de874was backpatched to 14, but there's no bms_del_member() there due to live_parts not yet existing in RelOptInfo in that version. Technically there's no bug in version 15 as bms_del_member() didn't pfree when the set became empty prior to00b41463c(from v16). Applied to v15 anyway to keep the code similar and to avoid the bad coding pattern. Author: Bernd Reiß <bd_reiss@gmx.at> Reviewed-by: David Rowley <dgrowleyml@gmail.com> Discussion: https://postgr.es/m/6b88f27a-c45c-4826-8e37-d61a04d90182@gmx.at Backpatch-through: 15
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/.