Hi all, I occasionally see the message "WARNING: autovacuum worker started without a worker entry" in the logs. >From what I can see here <https://github.com/postgres/postgres/blob/master/src/backend/postmaster/autovacuum.c#L1678>, the launcher forked a worker and in the meantime the launcher decided the worker is no more useful. If that is right, I'm guessing why the worker should not be useful anymore: since a single worker could work on a table, the only reason I can find is that someone run manually vacuum within that database/table. Moreover, I've a question about emergency autovacuum (wraparound). Since autovacuum workers are started by postmaster on a signal received by the autovacuum launcher, and since with autovacuum = off the latter is not running, how does the postmaster decide to start and emergency autovacuum? I only found what seems to me a normal autovacuum start at <https://github.com/postgres/postgres/blob/master/src/backend/postmaster/postmaster.c#L5263>. Thanks, Luca
