PG Bug reporting form <noreply@postgresql.org> writes:
> It seems that on Windows the postmaster process can close a connection
> before slow client receives a FATAL message.
Yeah, we've come to that conclusion before, see for instance
https://www.postgresql.org/message-id/flat/E1iaD8h-0004us-K9%40gemulon.postgresql.org
I haven't heard any non-unpleasant ideas for working around it.
One thought that might or might not improve matters is for
the backend to explicitly close() the socket before exiting.
We intentionally don't do that (cf 268313a95), but maybe
doing it on Windows would be better than the existing issue
--- assuming it fixes the issue, that is.
regards, tom lane