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Nothing in the checkpointer calls InitXLOGAccess(), so WALInsertLocks never got initialized there. Without EXEC_BACKEND, it works anyway because the correct value is inherited from the postmaster, but with EXEC_BACKEND we've got a problem. The problem appears to have been introduced by commit 68a2e52bbaf98f136a96b3a0d734ca52ca440a95. To fix, move the relevant initialization steps from InitXLOGAccess() to XLOGShmemInit(), making this more parallel to what we do elsewhere. Amit Kapila
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/.