Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932998AbZFLINA (ORCPT ); Fri, 12 Jun 2009 04:13:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762283AbZFLIMo (ORCPT ); Fri, 12 Jun 2009 04:12:44 -0400 Received: from www.tglx.de ([62.245.132.106]:53354 "EHLO www.tglx.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758327AbZFLIMm (ORCPT ); Fri, 12 Jun 2009 04:12:42 -0400 Date: Fri, 12 Jun 2009 10:12:04 +0200 (CEST) From: Thomas Gleixner To: "Zhang, Yanmin" cc: Peter Zijlstra , Darren Hart , Rusty Russell , LKML Subject: Re: Bug: fio traps into kernel without exiting because futex has a deadloop In-Reply-To: <1244768378.2560.297.camel@ymzhang> Message-ID: References: <1244689688.2560.268.camel@ymzhang> <1244699756.6691.4.camel@laptop> <1244701128.6691.5.camel@laptop> <1244709196.2560.287.camel@ymzhang> <1244720183.6691.214.camel@laptop> <1244768378.2560.297.camel@ymzhang> User-Agent: Alpine 2.00 (LFD 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 662 Lines: 21 On Fri, 12 Jun 2009, Zhang, Yanmin wrote: > On Thu, 2009-06-11 at 13:36 +0200, Peter Zijlstra wrote: > > FWIW, using a private futex on a shm section is wrong in and of itself. > > What I mean is it could be used as a DOS attack. Right. Fix is on the way. > Did you try my test case? Could you kill it when it runs? No, you can not kill it. That's why it needs a proper fix. Will send out today. Thanks, tglx -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/