BUG #7631: tcp_keepalives_* parameters ignored in postgresql.conf - related to 9.0.10 or 9.0.9 patch?

The following bug has been logged on the website:

Bug reference: 7631
Logged by: Rob Johnson
Email address: robj(at)hightouchinc(dot)com
PostgreSQL version: 9.0.10
Operating system: RHEL 5.8
Description:

The last four lines in my postgresql.conf file, under
/var/lib/pgsql/9.0/data, are:

# (15 per hour * 6 hours = 90)
tcp_keepalives_count=90
tcp_keepalives_idle=240
tcp_keepalives_interval=240

I last changed this file on August 13th, 2012. I remember that when I added
these parameters to postgresql.conf, they showed the correct values when I
ran "show all" at the psql command line. However, they now all display 0
values.

I ran "show all" and included some of the output below. The config_file
parameter shows that when the instance started, it used the postgresql.conf
file that includes my tcp_keepalives_* parameters. The "max_connections"
parameter is 600, which I also have defined in that postgresql.conf file, so
I know that at least *some* non-default parameter values are processed
properly.

I *suspect* this problem was created by the 9.0.10 or 9.0.9 patch, because I
was running 9.0.8 when I changed the tcp_keepalives_* parameters, but that's
just an uninformed guess.

(I updated my postgresql* packages from the PGDG repository to 9.0.9 on
August 20th, and to 9.0.10 on September 25th.)

postgres=# show all;
name | setting |
description

---------------------------------+-----------------------------------------+---------------------------------------------------------------------------------
----------------------------------------------
...
config_file | /var/lib/pgsql/9.0/data/postgresql.conf |
Sets the server's main configuration file.
...
max_connections | 600 |
Sets the maximum number of concurrent connections.
...
tcp_keepalives_count | 0 |
Maximum number of TCP keepalive retransmits.
tcp_keepalives_idle | 0 |
Time between issuing TCP keepalives.
tcp_keepalives_interval | 0 |
Time between TCP keepalive retransmits.
...
(208 rows)