From owner-freebsd-hackers@FreeBSD.ORG  Tue Apr  8 15:33:11 2014
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 2BA7F408;
 Tue,  8 Apr 2014 15:33:11 +0000 (UTC)
Received: from mail.tdx.com (mail.tdx.com [62.13.128.18])
 by mx1.freebsd.org (Postfix) with ESMTP id C48211E6E;
 Tue,  8 Apr 2014 15:33:10 +0000 (UTC)
Received: from Mail-PC.tdx.co.uk (storm.tdx.co.uk [62.13.130.251])
 (authenticated bits=0)
 by mail.tdx.com (8.14.3/8.14.3/) with ESMTP id s38FX3Dx058140
 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO);
 Tue, 8 Apr 2014 16:33:04 +0100 (BST)
Date: Tue, 08 Apr 2014 16:33:03 +0100
From: Karl Pielorz <kpielorz_lst@tdx.co.uk>
To: John Baldwin <jhb@freebsd.org>
Subject: Re: Stuck CLOSED sockets / sshd / zombies...
Message-ID: <63EFBCBD259A410BB4D71742@Mail-PC.tdx.co.uk>
In-Reply-To: <201404080936.30651.jhb@freebsd.org>
References: <3FE645E9723756F22EF901AE@Mail-PC.tdx.co.uk>
 <201404071148.10157.jhb@freebsd.org>
 <9647C5438B5CD4A3058AB1A2@Mail-PC.tdx.co.uk>
 <201404080936.30651.jhb@freebsd.org>
X-Mailer: Mulberry/4.0.8 (Win32)
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Cc: freebsd-hackers@freebsd.org
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.17
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
 <freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-hackers>, 
 <mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers/>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
 <mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 08 Apr 2014 15:33:11 -0000



--On 08 April 2014 09:36 -0400 John Baldwin <jhb@freebsd.org> wrote:

> Humm, it needs to build new ones with debug symbols.  If it doesn't,
> you'll need to do 'make clean' before the other makes.  I think you
> should be fine to do that (make clean then the command above) for those
> directories and restart gdb without having to restart your sshd.  Please
> also add '/usr/src/libexec/rtld-elf' to the list of directories where you
> do this.  Then do 'detach' in gdb, exit gdb and restart it.

Ok, it hit an issue with libc (complained it couldn't find yp.h - but I 
fixed that) and it compiled up OK then. The rest all recompiled / installed 
OK, and I included the rtld-elf code.

> Hmmm, that is useful even though the debug symbols aren't there.  Please
> do the rebuilds I asked for above and re-attach gdb and get 'bt' again.

Ok, that now nets:

"
...
[Switching to LWP 100218]
0x00000008038ea89c in __error () from /lib/libthr.so.3
(gdb) bt
#0  0x00000008038ea89c in __error () from /lib/libthr.so.3
#1  0x00000008038e104f in __thr_rwlock_rdlock (rwlock=0x803af9480, 
flags=<value optimized out>, tsp=<value optimized out>)
    at /usr/src/lib/libthr/thread/thr_umtx.c:277
#2  0x00000008038e821c in _thr_rtld_rlock_acquire (lock=0x803af9480) at 
atomic.h:143
#3  0x000000080064f9a2 in rlock_acquire (lock=0x80085fe00, 
lockstate=0x7fffffffba68) at /usr/src/libexec/rtld-elf/rtld_lock.c:197
#4  0x00000008006498c9 in _rtld_bind (obj=0x800662000, reloff=13008) at 
/usr/src/libexec/rtld-elf/rtld.c:675
#5  0x00000008006470cd in _rtld_bind_start () at 
/usr/src/libexec/rtld-elf/amd64/rtld_start.S:99
#6  0x0000000000000246 in ?? ()
#7  0x0000000000000000 in ?? ()
"

-Karl