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src/test/kerberos and src/test/ldap need to run a private authentication server of the relevant type, for which they need a free TCP port. They were just picking a random port number in 48K-64K, which works except when something's already using the particular port. Notably, the probability of failure rises dramatically if one simply runs those tests in a tight loop, because each test cycle leaves behind a bunch of high ports that are transiently in TIME_WAIT state. To fix, split out the code that PostgresNode.pm already had for identifying a free TCP port number, so that it can be invoked to choose a port for the KDC or LDAP server. This isn't 100% bulletproof, since conceivably something else on the machine could grab the port between the time we check and the time we actually start the server. But that's a pretty short window, so in practice this should be good enough. Back-patch to v11 where these test suites were added. Patch by me, reviewed by Andrew Dunstan. Discussion: https://postgr.es/m/3397.1564872168@sss.pgh.pa.us |
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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/.