From owner-freebsd-stable@freebsd.org Thu Sep 3 11:02:59 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 7FDCA9C9587; Thu, 3 Sep 2015 11:02:59 +0000 (UTC) (envelope-from erichsfreebsdlist@alogt.com) Received: from alogt.com (alogt.com [69.36.191.58]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 5CF17A4C; Thu, 3 Sep 2015 11:02:59 +0000 (UTC) (envelope-from erichsfreebsdlist@alogt.com) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=alogt.com; s=default; h=Content-Transfer-Encoding:Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Subject:Cc:To:From:Date; bh=JMx6ONg0cwRtEh6VLO+jf5GQErquC60j7mUlB+LI6OI=; b=bx7PNYbnyh0kvJbTciIckjKazlXiXebS4HLSZazKc5oDBADqKyDoOgAzwKC4l4O0fca7Z6ScHu5zPYth7OPm3PeAuYgQEcevAlCN3kxzjOJwRwpQAiOqtjkYag3xqDmBil5yiIpyeNEamqJyKowgJ5X1LVKR8ywfYNHBJRHDNQQ=; Received: from [114.124.24.124] (port=64735 helo=X220.alogt.com) by sl-508-2.slc.westdc.net with esmtpsa (TLSv1.2:AES128-GCM-SHA256:128) (Exim 4.85) (envelope-from ) id 1ZXSIE-001itn-0E; Thu, 03 Sep 2015 05:02:58 -0600 Date: Thu, 3 Sep 2015 19:02:50 +0800 From: Erich Dollansky To: Konstantin Belousov Cc: FreeBSD stable , freebsd-threads@freebsd.org Subject: Re: pthread_cancel / sleep change in behaviour Message-ID: <20150903190250.26273e27@X220.alogt.com> In-Reply-To: <20150903104351.GE2072@kib.kiev.ua> References: <20150903080047.16be939e@X220.alogt.com> <20150903081947.GB2072@kib.kiev.ua> <20150903183353.2633a38b@X220.alogt.com> <20150903104351.GE2072@kib.kiev.ua> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - sl-508-2.slc.westdc.net X-AntiAbuse: Original Domain - freebsd.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - alogt.com X-Get-Message-Sender-Via: sl-508-2.slc.westdc.net: authenticated_id: erichsfreebsdlist@alogt.com X-Source: X-Source-Args: X-Source-Dir: 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 11:02:59 -0000 Hi, On Thu, 3 Sep 2015 13:43:51 +0300 Konstantin Belousov wrote: > On Thu, Sep 03, 2015 at 06:33:53PM +0800, Erich Dollansky wrote: > > 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 I did not know of this. I simply blocked all. As it worked when I tested it those days, I forgot about it. > 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. > I am just updating another machine. It might be already tomorrow when I will come back to you. Erich