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pgbouncer can cause PQbackendPID() to return negative values due to it filling be_pid with random bytes (even these days pid_max can only be set up to 2^22 on 64b machines on Linux, for example, so this cannot happen with normal PID numbers). When this happens, pg_basebackup may generate a temporary slot name that may not be accepted by the parser, leading to spurious failures, like: pg_basebackup: error: could not send replication command ERROR: replication slot name "pg_basebackup_-1201966863" contains invalid character This commit fixes that problem by formatting the result from PQbackendPID() as an unsigned integer when creating the temporary replication slot name, so as the invalid character is gone and the command can be parsed. Author: Jelte Fennema Reviewed-by: Daniel Gustafsson, Nishant Sharma Discussion: https://postgr.es/m/CAGECzQQOGvYfp8ziF4fWQ_o8s2K7ppaoWBQnTmdakn3s-4Z=5g@mail.gmail.com Backpatch-through: 11
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/.