From owner-freebsd-questions@FreeBSD.ORG  Wed Jun  3 11:09:43 2015
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 84269FD
 for <freebsd-questions@freebsd.org>; Wed,  3 Jun 2015 11:09:43 +0000 (UTC)
 (envelope-from ortadur@web.de)
Received: from mout.web.de (mout.web.de [212.227.17.11])
 (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client CN "mout.web.de", Issuer "TeleSec ServerPass DE-1" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id 0FF6E1239
 for <freebsd-questions@freebsd.org>; Wed,  3 Jun 2015 11:09:42 +0000 (UTC)
 (envelope-from ortadur@web.de)
Received: from [131.169.214.139] by 3capp-webde-bs60.server.lan (via HTTP);
 Wed, 3 Jun 2015 13:09:39 +0200
MIME-Version: 1.0
Message-ID: <trinity-cc434a7f-87f5-4308-82d1-72c9e02913aa-1433329779257@3capp-webde-bs60>
From: "Andre Meiser" <ortadur@web.de>
To: freebsd-questions@freebsd.org
Subject: Aw: Re: Many core dumps in pthread_getspecific - how to debug?
Content-Type: text/plain; charset=UTF-8
Date: Wed, 3 Jun 2015 13:09:39 +0200
Importance: normal
Sensitivity: Normal
In-Reply-To: <20150603164756.06961d69@X220.alogt.com>
References: <trinity-75eb1594-6ceb-4d11-84fe-c10f9ce82b04-1433315382930@3capp-webde-bs56>,
 <20150603164756.06961d69@X220.alogt.com>
X-UI-Message-Type: mail
X-Priority: 3
X-Provags-ID: V03:K0:br91KGs7tpKlNi6VLK2k5PNJbFQV09zkXIjXwluIFoI
 ntSBIKhQfH6o7RIdZ1VmWpqdQDE2hvszxp1ak3C+ecO1G7biE2
 Hc+KLQxDjDC4lacrifkkb17gMd8Y2xqmskrz/89i9TRBb+JB8r
 ZpSh/aCY5ZPyhqe5MfbcGBUBUoLvrshcXTxkFtdUJrpSMPbtXC
 KBUHvVSa4s8k3kP/5v2779Bc77MEAWjqHu7gqgf9jjXlBGe0QH
 uixKnleJZF2DPQksD9HpGJmoMr+TObNRWTh3xVDPHlE/QEjsYr ZPJnoA=
X-UI-Out-Filterresults: notjunk:1;
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.20
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions/>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 03 Jun 2015 11:09:43 -0000

On Wed, 3 Jun 2015 10:47 +0200 Erich Dollansky wrote:
> welcome!

thx ;)


> Can you get the sources and compile your own FreeBSD?

I got the source from here: http://svnweb.freebsd.org/base/releng/10.1/

And in lib/libkse/thread/thr_spec.c line 211-214 I found this:

    pthread = _get_curthread();

    /* Check if there is specific data: */
    if (pthread->specific != NULL && (unsigned int)key < PTHREAD_KEYS_MAX) {

If pthread is NULL than this will crash with a core dump. So I made a quick grep about the sources and at other places the return value of _get_curthread() is compared with NULL, e.g. thr_kern.c in line 601:

    if ((crit != NULL) && ((curthread = _get_curthread()) != NULL))

It looks like _get_curthread() may return NULL and than thr_spec.c line 214 has to look like this:

    if (pthread != NULL && pthread->specific != NULL && (unsigned int)key < PTHREAD_KEYS_MAX) {

But I'm new to FreeBSD, so I'm not sure if this will help to fix the problem. And I'm not experienced enough to compile my own FreeBSD, yet.


> Try first the source. The best mailing list for this should be
> 'stable' as it targets only the stable versions like yours.

Ok, thanks, I'll write it there, too.

Sincerely yours Andre.