Invalid argument on accept(2)

[Duane Hill]

I have an issue where I'm getting periodic errors in /var/log/messages and 
/var/log/maillog where it states:

   Feb 27 18:23:33 smtpgate postfix/smtpd[68480]: fatal:
                   accept connection: Invalid argument

I've been to the Postfix list and have received a number of responses. One 
of the developers is stating:

   "Erroring out with EINVAL would still be a kernel bug."

This server is running FreeBSD 5.5-RELEASE-p9 amd64.

Perhaps someone could enlighten me on what I can do to debug some socket 
connections to see what's going on.