BUG #3745: I am unable to load the data in postgresql DB

The following bug has been logged online:

Bug reference:      3745
Logged by:          Jawad Hussain
Email address:      jhussain2@csc.com
PostgreSQL version: 8.1.9
Operating system:   Linux
Description:        I am unable to load the data in postgresql DB
Details:

Below is the error log I am getting repeatedly in the file pgstartup.log.

WARNING:  could not create listen socket for "localhost"
FATAL:  could not create any TCP/IP sockets
LOG:  logger shutting down
LOG:  logger shutting down
LOG:  logger shutting down
LOG:  logger shutting down
LOG:  logger shutting down
LOG:  logger shutting down
LOG:  logger shutting down
FATAL:  lock file "postmaster.pid" already exists
HINT:  Is another postmaster (PID 25372) running in data directory
"/var/lib/pgsql/data"?
FATAL:  lock file "postmaster.pid" already exists
HINT:  Is another postmaster (PID 25372) running in data directory
"/var/lib/pgsql/data"?
FATAL:  lock file "postmaster.pid" already exists
HINT:  Is another postmaster (PID 25372) running in data directory
"/var/lib/pgsql/data"?
FATAL:  lock file "postmaster.pid" already exists
HINT:  Is another postmaster (PID 25372) running in data directory
"/var/lib/pgsql/data"?
LOG:  logger shutting down
FATAL:  lock file "postmaster.pid" already exists
HINT:  Is another postmaster (PID 9346) running in data directory
"/var/lib/pgsql/data"?
FATAL:  lock file "postmaster.pid" already exists
HINT:  Is another postmaster (PID 9346) running in data directory
"/var/lib/pgsql/data"?

Please suggest on this.