From owner-freebsd-hackers@FreeBSD.ORG  Tue Apr  8 19:18:46 2014
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Date: Tue, 08 Apr 2014 20:18:44 +0100
From: Karl Pielorz <kpielorz_lst@tdx.co.uk>
To: Konstantin Belousov <kostikbel@gmail.com>
Subject: Re: Stuck CLOSED sockets / sshd / zombies...
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--On 8 April 2014 19:43:53 +0300 Konstantin Belousov <kostikbel@gmail.com> 
wrote:

> The following patch might allow to see the backtrace beyond the binder
> entry point.  You might also have better luck with the gdb from ports.
>
> diff --git a/libexec/rtld-elf/amd64/rtld_start.S
> [snip]

If I apply that I presume I'm going to have to build / start the whole 
thing again (i.e. restart sshd at least / possibly the system etc.) and get 
it to hang again?

I might see how far we can get with the current stuff before I have to go 
through that again :)

-Karl