Alvaro Herrera <alvherre(at)commandprompt(dot)com> writes:
> ... We have an open problem report on autovacuum failing to run after
> some time, and we haven't been able to get a backtrace or strace because
> of this issue ...
I wonder whether that's the already-fixed problem with autovacuum cost
limit going to zero in long-lived workers.
regards, tom lane