BUG #7815: Upgrading PostgreSQL from 9.1 to 9.2 with pg_upgrade/postgreql-setup fails - invalid status retrieve

The following bug has been logged on the website:

Bug reference:      7815
Logged by:          George Machitidze
Email address:      giomac@gmail.com
PostgreSQL version: 9.2.2
Operating system:   Fedora 18 Linux
Description:        =


https://bugzilla.redhat.com/show_bug.cgi?id=3D896161
Upgrading PostgreSQL from 9.1 to 9.2 with pg_upgrade/postgreql-setup fails
with invalid message "There seems to be a postmaster servicing the old
cluster". Looks like pg_upgrade is checking pid file too early without
waiting for master process to exit:

open("/var/lib/pgsql/data-old/postmaster.pid", O_RDONLY) =3D 5