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Date: Fri, 2 Aug 2013 08:54:59 -0400
From: Gary Palmer <gpalmer@freebsd.org>
To: Mike Tancsa <mike@sentex.net>
Subject: Re: Listen queue overflow
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On Thu, Aug 01, 2013 at 10:47:40AM -0400, Mike Tancsa wrote:
> After upgrading from a RELENG9 kernel from June 18th to July 27th, I am
> seeing this odd new message.  Is this a new bug, or just a new
> diagnostic message ? I am guessing it happened after r253035 ?
> 
> 
> sonewconn: pcb 0xfffffe001ac76930: Listen queue overflow: 8 already in
> queue awaiting acceptance
> sonewconn: pcb 0xfffffe001ac76930: Listen queue overflow: 8 already in
> queue awaiting acceptance
> sonewconn: pcb 0xfffffe001ac76930: Listen queue overflow: 8 already in
> queue awaiting acceptance
> sonewconn: pcb 0xfffffe001ac76930: Listen queue overflow: 8 already in
> queue awaiting acceptance
> sonewconn: pcb 0xfffffe001ac76930: Listen queue overflow: 8 already in
> queue awaiting acceptance
> sonewconn: pcb 0xfffffe001ac76930: Listen queue overflow: 8 already in
> queue awaiting acceptance

If you run 

netstat -naA | grep fffffe001ac76930

you should be able to identify which socket is producing the warning
messages.  That should give you a better understanding of what is
triggering the messages

Regards,

Gary