Rainer Tammer <pgsql(at)spg(dot)schulergroup(dot)com> writes:
> 2021-08-25 16:22:33 CEST DEBUG: postmaster received signal 2
> 2021-08-25 16:22:33 CEST LOG: received fast shutdown request
Well, something sent the postmaster SIGINT. There isn't any
mechanism within Postgres itself that would do that; you need
to look for outside causes.
regards, tom lane