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Revert the map/unmap dance I tried in commit 73042b8d1; that helps not at all. Instead, speculate that the unwanted allocation is being done on another thread, and thus timing variations explain the apparent unpredictability. Temporarily add a 1-second sleep before the VirtualFree call, in hopes that any such other threads will quiesce and not jog our elbow. This is obviously not a desirable long-term fix, but as a means of investigation it seems useful. Discussion: https://postgr.es/m/25495.1524517820@sss.pgh.pa.us
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/.