From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <cygwin-return-171752-listarch-cygwin=sourceware.org@cygwin.com>
Received: (qmail 17619 invoked by alias); 30 Jul 2011 08:22:04 -0000
Received: (qmail 17597 invoked by uid 22791); 30 Jul 2011 08:21:46 -0000
X-Spam-Check-By: sourceware.org
Received: from aquarius.hirmke.de (HELO calimero.vinschen.de) (217.91.18.234)    by sourceware.org (qpsmtpd/0.83/v0.83-20-g38e4449) with ESMTP; Sat, 30 Jul 2011 08:21:33 +0000
Received: by calimero.vinschen.de (Postfix, from userid 500)	id 59DA42C0634; Sat, 30 Jul 2011 10:21:30 +0200 (CEST)
Date: Sat, 30 Jul 2011 08:22:00 -0000
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: 1.7.10s 20110729 - problem listing services in /proc
Message-ID: <20110730082130.GI26203@calimero.vinschen.de>
Reply-To: cygwin@cygwin.com
Mail-Followup-To: cygwin@cygwin.com
References: <4E3302E5.6000602@acm.org> <j105ne$jrp$1@dough.gmane.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
In-Reply-To: <j105ne$jrp$1@dough.gmane.org>
User-Agent: Mutt/1.5.21 (2010-09-15)
Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm
Precedence: bulk
List-Id: <cygwin.cygwin.com>
List-Subscribe: <mailto:cygwin-subscribe@cygwin.com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin@cygwin.com>
List-Help: <mailto:cygwin-help@cygwin.com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner@cygwin.com
Mail-Followup-To: cygwin@cygwin.com
X-SW-Source: 2011-07/txt/msg00404.txt.bz2

On Jul 30 14:44, jojelino wrote:
> Breakpoint 2, fhandler_registry::close (this=0x612cba5c)
>     at /tmp/winsup/winsup/cygwin/fhandler_registry.cc:856
> 856           cfree (value_name);
> 10: this->value_name = 0x612cb374 L"services"
> (gdb)
> Continuing.
> 
> 0x612cba5c->value_name = 0
> 0x612cb124_2->value_name = 0x612cba5c->value_name = 0x612cb374
> L"services" (quadruple-freed but known as not freed)
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x7c80bef7 in RaiseException () from
> /cygdrive/c/WINDOWS/system32/kernel32.dll
> 
> In brief, same address quadruple-freed. because of dangling pointer.
> Regards.

It turned out that I could reproduce the problem, I just didn't notice
it.  I expected an error message but find died silently, so I took that
as "it works".  Serves me right for looking into Cygwin bug reports too
late at night.

Fixed in CVS.  I'm going to create a new snpshot.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple