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From: John Baldwin <jhb@freebsd.org>
To: Karl Pielorz <kpielorz_lst@tdx.co.uk>
Subject: Re: Stuck CLOSED sockets / sshd / zombies...
Date: Tue, 8 Apr 2014 15:33:53 -0400
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Cc: Konstantin Belousov <kostikbel@gmail.com>, freebsd-hackers@freebsd.org
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On Tuesday, April 08, 2014 3:18:44 pm Karl Pielorz wrote:
> 
> --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 :)

I think this patch only changes debug info, so I think you can just build
and install and re-attach gdb without having to restart sshd.  Also, this
patch should only require you to build and install libexec/rtld-elf.

-- 
John Baldwin