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When pgstats is initialized for a backend, it uses dsa_attach_in_place()
without a "segment" provided. Hence, no callback is registered to
automatically release the DSA attached once a backend exits. Not doing
any cleanup causes the reference count of the pgstats DSA to
continuously increment, at some point overflowing it (the more the
number of connections, the faster it is to reach this state). Once the
reference count overflows and then gets back to 0, new backends are not
able to attach to the pgstats DSA, failing startup.
This issue is resolved by adding in the pgstats shutdown hook a call to
dsa_release_in_place(), ensuring that the DSA attached at backend
startup is correctly released, keeping the reference count at bay.
The author of this patch has been able to see this issue on a server
with a long uptime and a high connection turnover.
Issue introduced by
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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/.