Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965230AbVIIBfL (ORCPT ); Thu, 8 Sep 2005 21:35:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965231AbVIIBfL (ORCPT ); Thu, 8 Sep 2005 21:35:11 -0400 Received: from e35.co.us.ibm.com ([32.97.110.133]:40394 "EHLO e35.co.us.ibm.com") by vger.kernel.org with ESMTP id S965230AbVIIBfG (ORCPT ); Thu, 8 Sep 2005 21:35:06 -0400 Date: Thu, 8 Sep 2005 18:34:26 -0700 From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org Subject: signal race tests Message-ID: <20050909013425.GA2798@us.ibm.com> Reply-To: paulmck@us.ibm.com Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="IS0zKkzwUGydFO0o" Content-Disposition: inline User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 19416 Lines: 287 --IS0zKkzwUGydFO0o Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Resurfacing... I put together some "steamroller" race tests, that race a pair of operations (e.g., kill() and exit()) against each other, varying the start times of each operation in an attempt to find any destructive races between the two operations. There are but five pairs of operations coded up thus far, wanted to get thoughts and suggestions. (Forget about continuously varying the start time of three operations unless you are quite a bit more patient than am I -- it already takes several minutes to run some of the tests.) I have no idea where to put this, so, for the moment have attached a bzip2-ed tarball. This actually does find problems with the RCU'ed signal paths, and am thinking of solutions, none of which are particularly attractive. One is to "lock down" tasks that might receive the signal, but this gets complicated and ugly quickly. Another is to create a new per-task lock that must be held when changing the "shape" of the task -- RCU still protects the task list and the sighand structure, but the race with (say) reparenting is protected by the new lock. Thoughts? 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