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79a5911fe6
widowbird has failed again after af8837a10bc7, with the same symptoms of a backend still lying around when attempting a database rename with a bgworker connected to the database being renamed. We are still not sure yet how the failure can be reached, if this is a timing issue in the test or an actual bug in the logic used for interruptible bgworkers. This commit adds more debugging information in the backend to help with the analysis as a temporary measure. Another thing I have noticed is that the queries launching the dynamic bgworkers or checking pg_stat_activity would connect to the database renamed. These are switched to use 'postgres'. That will hopefully remove some of the friction of the test, but I doubt that this is the end of the story. Discussion: https://postgr.es/m/abtJLEAsf1HZXWdR@paquier.xyz