From owner-freebsd-hackers@FreeBSD.ORG Thu Aug 7 11:21:22 2003 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 85A7337B401 for ; Thu, 7 Aug 2003 11:21:22 -0700 (PDT) Received: from relay.pair.com (relay.pair.com [209.68.1.20]) by mx1.FreeBSD.org (Postfix) with SMTP id 3B0FD43F85 for ; Thu, 7 Aug 2003 11:21:21 -0700 (PDT) (envelope-from silby@silby.com) Received: (qmail 43755 invoked from network); 7 Aug 2003 18:21:19 -0000 Received: from niwun.pair.com (HELO localhost) (209.68.2.70) by relay.pair.com with SMTP; 7 Aug 2003 18:21:19 -0000 X-pair-Authenticated: 209.68.2.70 Date: Thu, 7 Aug 2003 13:18:50 -0500 (CDT) From: Mike Silbersack To: Robert Watson In-Reply-To: Message-ID: <20030807131751.G38264@odysseus.silby.com> References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: freebsd-hackers@freebsd.org Subject: Re: possible deadlocks? X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Aug 2003 18:21:23 -0000 On Thu, 7 Aug 2003, Robert Watson wrote: > On Wed, 6 Aug 2003, Ted Unangst wrote: > > > My advisor Dawson Engler has written a deadlock detector, and we'd like > > some verification. They look like bugs, unless there is some other > > reason why two call chains cannot happen at the same time. > > Neat -- sounds like two good catches given the responses so far. Can we > expect more such reports forthcoming? This kind of help will be > invaluable in finishing up the fine-grained locking work. Alternatively, > do you plan to post the software? Is this static or dynamic analysis? > etc, etc? :-) > > Robert N M Watson FreeBSD Core Team, TrustedBSD Projects > robert@fledge.watson.org Network Associates Laboratories Just for everyone's info, any locking problems that I introduce over the next few months will not be mistakes, they will be "test cases" for the deadlock detector. Mike "Silby" Silbersack