From owner-freebsd-stable@freebsd.org Thu Sep 3 10:44:00 2015 Return-Path: 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 A7B389C8A18; Thu, 3 Sep 2015 10:44:00 +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 21E2C1DAC; Thu, 3 Sep 2015 10:43:59 +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 t83AhpGx065948 (version=TLSv1 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO); Thu, 3 Sep 2015 13:43:52 +0300 (EEST) (envelope-from kostikbel@gmail.com) DKIM-Filter: OpenDKIM Filter v2.10.3 kib.kiev.ua t83AhpGx065948 Received: (from kostik@localhost) by tom.home (8.15.2/8.15.2/Submit) id t83AhpNY065947; Thu, 3 Sep 2015 13:43:51 +0300 (EEST) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f Date: Thu, 3 Sep 2015 13:43:51 +0300 From: Konstantin Belousov To: Erich Dollansky Cc: FreeBSD stable , freebsd-threads@freebsd.org Subject: Re: pthread_cancel / sleep change in behaviour Message-ID: <20150903104351.GE2072@kib.kiev.ua> References: <20150903080047.16be939e@X220.alogt.com> <20150903081947.GB2072@kib.kiev.ua> <20150903183353.2633a38b@X220.alogt.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150903183353.2633a38b@X220.alogt.com> 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 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 03 Sep 2015 10:44:00 -0000 On Thu, Sep 03, 2015 at 06:33:53PM +0800, Erich Dollansky wrote: > Hi, > > On Thu, 3 Sep 2015 11:19:47 +0300 > Konstantin Belousov wrote: > > > On Thu, Sep 03, 2015 at 08:00:47AM +0800, Erich Dollansky wrote: > > > > > > Is this change of behaviour a feature or a bug? > > > > Provide a minimal example demonstrating the issue. > > while preparing the example I found the source of the problem. We have > to block all signals for some reason. The handling for > > signal (SIGTHR, SIG_IGN); > > seems to have changed. The moment I remove above's line from the code, > the program works. There is no difference when the programs runs on > machines prior mid November 2014. > Err, this is a bug, probably both in your program (user code must not twiddle with SIGCANCEL) and in libc. The later, I believe, was fixed in the HEAD r287300, which is not yet merged back to stable/10. The libthr has a protection disallowing user code manipulating SIGCANCEL, but due to the bug in libc signal(3) override the libthr measures. Apply the r287300 to your src/ and try your unchanged program with updated libc. But yes, SIGTHR/SIGCANCEL in the program is bug. > Thanks for your help. Simplifying the program brought me to the > solution. > > Do you want the example? > > Erich > > _______________________________________________ > > freebsd-stable@freebsd.org mailing list > > https://lists.freebsd.org/mailman/listinfo/freebsd-stable > > To unsubscribe, send any mail to > > "freebsd-stable-unsubscribe@freebsd.org"