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After commitb0bea38705, syslogger prints 63 warnings about failing to close a listen socket at postmaster startup. That's because the syslogger process forks before the ListenSockets array is initialized, so ClosePostmasterPorts() calls "close(0)" 64 times. The first call succeeds, because fd 0 is stdin. This has been like this since commit9a86f03b4ein version 13, which moved the SysLogger_Start() call to before initializing ListenSockets. We just didn't notice until commitb0bea38705added the LOG message. Reported by Michael Paquier and Jeff Janes. Author: Michael Paquier Discussion: https://www.postgresql.org/message-id/ZOvvuQe0rdj2slA9%40paquier.xyz Discussion: https://www.postgresql.org/message-id/ZO0fgDwVw2SUJiZx@paquier.xyz#482670177eb4eaf4c9f03c1eed963e5f Backpatch-through: 13