From owner-freebsd-arch@FreeBSD.ORG Tue Oct 5 16:26:29 2004 Return-Path: Delivered-To: freebsd-arch@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id EBC7E16A4CE for ; Tue, 5 Oct 2004 16:26:29 +0000 (GMT) Received: from mail3.speakeasy.net (mail3.speakeasy.net [216.254.0.203]) by mx1.FreeBSD.org (Postfix) with ESMTP id C2EEE43D39 for ; Tue, 5 Oct 2004 16:26:29 +0000 (GMT) (envelope-from jhb@FreeBSD.org) Received: (qmail 9851 invoked from network); 5 Oct 2004 16:26:29 -0000 Received: from dsl027-160-063.atl1.dsl.speakeasy.net (HELO server.baldwin.cx) ([216.27.160.63]) (envelope-sender ) encrypted SMTP for ; 5 Oct 2004 16:26:28 -0000 Received: from [10.50.40.210] (gw1.twc.weather.com [216.133.140.1]) (authenticated bits=0) by server.baldwin.cx (8.12.11/8.12.11) with ESMTP id i95GQN0l065355; Tue, 5 Oct 2004 12:26:24 -0400 (EDT) (envelope-from jhb@FreeBSD.org) From: John Baldwin To: freebsd-arch@FreeBSD.org Date: Tue, 5 Oct 2004 10:00:15 -0400 User-Agent: KMail/1.6.2 References: <1095468747.31297.241.camel@palm.tree.com> <20041004184939.GA8178@peter.osted.lan> <1096945958.46385.44.camel@palm.tree.com> In-Reply-To: <1096945958.46385.44.camel@palm.tree.com> MIME-Version: 1.0 Content-Disposition: inline Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <200410051000.15379.jhb@FreeBSD.org> X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on server.baldwin.cx cc: Peter Holm cc: "freebsd-arch@freebsd.org" cc: Julian Elischer cc: Stephan Uphoff Subject: Re: scheduler (sched_4bsd) questions X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Oct 2004 16:26:30 -0000 On Monday 04 October 2004 11:12 pm, Stephan Uphoff wrote: > On Mon, 2004-10-04 at 14:49, Peter Holm wrote: > > On Mon, Oct 04, 2004 at 01:34:38PM -0400, Stephan Uphoff wrote: > > ---- snip ---- > > > > - but my time budget is limited and Peter has an interesting bug left > > > that has priority. > > > > I'm not closer to being able to create this panic in a controlled way. > > After a whole day of different tests I finally got this panic: > > http://www.holm.cc/stress/log/cons81.html. The trigger seems to be one > > particular Java applet, but it is not easily reproduceable. > > > > - Peter > > ---- snip ---- > > I found a race condition in sleepq_catch_signals / sleepq_resume_thread > that may cause sleepq_resume_thread to add a thread to the run queue > that is already there. Note that setrunnable() checks the thread state and doesn't call setrunqueue if the thread is already on the runqueue (see the TDS_RUNQ case in the switch statement). Is this what you are referring to? -- John Baldwin <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org