From owner-freebsd-stable@freebsd.org  Thu Aug 27 17:17:49 2015
Return-Path: <owner-freebsd-stable@freebsd.org>
Delivered-To: freebsd-stable@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 9E0109C3649
 for <freebsd-stable@mailman.ysv.freebsd.org>;
 Thu, 27 Aug 2015 17:17:49 +0000 (UTC)
 (envelope-from kostikbel@gmail.com)
Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1])
 (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 314C2114E
 for <freebsd-stable@freebsd.org>; Thu, 27 Aug 2015 17:17:49 +0000 (UTC)
 (envelope-from kostikbel@gmail.com)
Received: from tom.home (kostik@localhost [127.0.0.1])
 by kib.kiev.ua (8.15.2/8.15.2) with ESMTPS id t7RHHi9N093158
 (version=TLSv1 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO);
 Thu, 27 Aug 2015 20:17:44 +0300 (EEST)
 (envelope-from kostikbel@gmail.com)
DKIM-Filter: OpenDKIM Filter v2.10.3 kib.kiev.ua t7RHHi9N093158
Received: (from kostik@localhost)
 by tom.home (8.15.2/8.15.2/Submit) id t7RHHi07093157;
 Thu, 27 Aug 2015 20:17:44 +0300 (EEST)
 (envelope-from kostikbel@gmail.com)
X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com
 using -f
Date: Thu, 27 Aug 2015 20:17:44 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: Pete French <petefrench@ingresso.co.uk>
Cc: Mark.Martinec+freebsd@ijs.si, freebsd-stable@freebsd.org
Subject: Re: Latest stable (r287104) bash leaves zombies on exit
Message-ID: <20150827171744.GL2072@kib.kiev.ua>
References: <20150827162602.GJ2072@kib.kiev.ua>
 <E1ZV0d8-0000fn-18@dilbert.ingresso.co.uk>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <E1ZV0d8-0000fn-18@dilbert.ingresso.co.uk>
User-Agent: Mutt/1.5.23 (2014-03-12)
X-Spam-Status: No, score=-2.0 required=5.0 tests=ALL_TRUSTED,BAYES_00,
 DKIM_ADSP_CUSTOM_MED,FREEMAIL_FROM,NML_ADSP_CUSTOM_MED autolearn=no
 autolearn_force=no version=3.4.1
X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on tom.home
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.20
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-stable>, 
 <mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable/>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
 <mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 27 Aug 2015 17:17:49 -0000

On Thu, Aug 27, 2015 at 06:06:26PM +0100, Pete French wrote:
> > Try to obtain the backtrace from the hung xterm. Ideally, you would
> > rebuild xterm and the system libraries (rtld+libc+libthr) with debug
> > symbols and get the backtraces after that.
> 
> I can try this tomorrow - what do I need to set in src.conf to add
> debug symbols in when I do a buidlworld (thats what I would end
> up doing) ? never played with this bit - am hoping
> its as simple as 'DEBUG=yes' for both porst and world though!

For ports, it is probably WITH_DEBUG=yes, but check it.

For src, do
cd /usr/src
(cd lib/libc && make DEBUG_FLAGS=-g all install)
(cd lib/libthr && make DEBUG_FLAGS=-g all install)
(cd libexec/rtld-elf && make DEBUG_FLAGS=-g all install)