BUG #6716: memory of Autovacuum leak?

The following bug has been logged on the website:

Bug reference:      6716
Logged by:          runner.mei
Email address:      runner.mei@gmail.com
PostgreSQL version: 9.1.3
Operating system:   win2003
Description:=20=20=20=20=20=20=20=20

My program using a postgresql9.1.3, and running in win2003. Generally have
17-18 processes of postgresql, the memory of any process no more than 60M,
but today the memory of a process to reach 880M.At first I thought it was
temporary, but until now has been going on for 9 hours, and continues to
grow.The parameters of the process for "- forkavlauncher -x3" someone can
help me?