Unexpected data beyond EOF during heavy writes

Hello everyone,

We are seeing the following error message occasionally in the postgres logs:

2010-05-13 23:49:03 PDT ERROR: unexpected data beyond EOF in block 4106698 of relation "custom_discoveryprofile"

2010-05-13 23:49:03 PDT HINT: This has been seen to occur with buggy kernels; consider updating your system.

I have read several threads on this, including:
http://archives.postgresql.org/pgsql-general/2007-03/msg01535.php
and

http://archives.postgresql.org/pgsql-general/2009-07/msg01011.php

I am wondering if anyone has ever placed a bug report to any of the linux vendors or open source sites?  

I could not find a bug report that matched this at http://bugzilla.redhat.com/ and am trying to track down what is needed to resolve the error.

We are running a an IBM Blade Center server 64 bit Red Hat 5.3 kernel with 16 cores doing heavy I/O to the database.
uname -a
Linux 2.6.18-128.el5 #1 SMP Wed Dec 17 11:41:38 EST 2008 x86_64 x86_64 x86_64 GNU/Linux x86_64 x86_64 x86_64 GNU/Linux

Thanks for any pointers,