Message-ID: <6e51b015-0cb7-49aa-8d09-024f58fc6c2d@gmail.com>
Date: Mon, 16 Feb 2026 20:00:00 +0200
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Subject: Re: race condition in pg_class
To: Noah Misch <noah@leadboat.com>
Cc: pgsql-hackers@postgresql.org
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From: Alexander Lakhin <exclusion@gmail.com>
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16.02.2026 19:03, Noah Misch wrote:

> Here's the non-TODO failure in that log:
>
> [13:11:30.050](0.002s) not ok 10 - no such database stderr /(?^:FATAL:  database "no-such-database" does not exist)/
> [13:11:30.051](0.001s) #   Failed test 'no such database stderr /(?^:FATAL:  database "no-such-database" does not exist)/'
> #   at C:/tools/xmsys64/home/pgrunner/bf/root/REL_18_STABLE/pgsql/src/bin/pgbench/t/001_pgbench_with_server.pl line 100.
> [13:11:30.051](0.000s) #                   'pgbench: error: connection to server on socket "C:/tools/xmsys64/tmp/P5YfRmVxhI/.s.PGSQL.10766" failed: server closed the connection unexpectedly
> # 	This probably means the server terminated abnormally
> # 	before or while processing the request.
> # pgbench: error: could not create connection for setup
> # '
> #     doesn't match '(?^:FATAL:  database "no-such-database" does not exist)'
>
>
> The server log has the expected message that pgbench didn't receive:
>
> 2026-02-12 13:11:29.662 UTC [8948:1] [unknown] LOG:  connection received: host=[local]
> 2026-02-12 13:11:29.664 UTC [8948:2] [unknown] LOG:  connection authenticated: user="pgrunner" method=trust (C:/tools/xmsys64/home/pgrunner/bf/root/REL_18_STABLE/pgsql.build/testrun/pgbench/001_pgbench_with_server/data/t_001_pgbench_with_server_main_data/pgdata/pg_hba.conf:117)
> 2026-02-12 13:11:29.664 UTC [8948:3] [unknown] LOG:  connection authorized: user=pgrunner database=no-such-database application_name=001_pgbench_with_server.pl
> 2026-02-12 13:11:29.664 UTC [8948:4] [unknown] FATAL:  database "no-such-database" does not exist

Yes, that's well-known Windows-specific anomaly:
https://wiki.postgresql.org/wiki/Known_Buildfarm_Test_Failures#Miscellaneous_tests_fail_on_Windows_due_to_a_connection_closed_before_receiving_a_final_error_message

Thank you for paying attention to my report!

Best regards,
Alexander