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Commit 3eb9a5e7c unintentionally introduced an ordering dependency into restore_toc_entries_prefork(). The existing coding of reduce_dependencies() contains a check to skip moving a TOC entry to the ready_list if it wasn't initially in the pending_list. This used to suffice to prevent reduce_dependencies() from trying to move anything into the ready_list during restore_toc_entries_prefork(), because the pending_list stayed empty throughout that phase; but it no longer does. The problem doesn't manifest unless the TOC has been reordered by SortTocFromFile, which is how I missed it in testing. To fix, just add a test for ready_list == NULL, converting the call with NULL from a poor man's sanity check into an explicit command not to touch TOC items' list membership. Clarify some of the comments around this; in particular, note the primary purpose of the check for pending_list membership, which is to ensure that we can't try to restore the same item twice, in case a TOC list forces it to be restored before its dependency count goes to zero. Per report from Fabrízio de Royes Mello. Back-patch to 9.3, like the previous commit. Discussion: https://postgr.es/m/CAFcNs+pjuv0JL_x4+=71TPUPjdLHOXA4YfT32myj_OrrZb4ohA@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/.