From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752169AbXCHBeW (ORCPT ); Wed, 7 Mar 2007 20:34:22 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752182AbXCHBeV (ORCPT ); Wed, 7 Mar 2007 20:34:21 -0500 Received: from mga03.intel.com ([143.182.124.21]:41835 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752169AbXCHBeH (ORCPT ); Wed, 7 Mar 2007 20:34:07 -0500 X-ExtLoop1: 1 X-IronPort-AV: i="4.14,262,1170662400"; d="scan'208"; a="192059683:sNHT18241475" Date: Wed, 7 Mar 2007 17:07:50 -0800 From: "Siddha, Suresh B" To: linux-kernel@vger.kernel.org Subject: Re: 2.6.21-rc2-mm2 hang Message-ID: <20070308010750.GB19790@linux-os.sc.intel.com> References: <20070306004408.d3f6434d.akpm@linux-foundation.org> <1173305536.868.8.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1173305536.868.8.camel@localhost.localdomain> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 07, 2007 at 02:12:16PM -0800, Dave Hansen wrote: > I'm seeing weird hangs running ltp on 2.6.21-rc2-mm2. It manifests > itself by the waitpid06 test in LTP hanging. This is very, very > reproducible in about 5 seconds by adding '-s wait' to the ltp command > line. > > I see 4 waitpid06 processes on my 4-way machine spinning in userspace. > But, the weird part is that I can't ssh in once this happens, but I can > log in to the console. I've bisected it down to: > > sched-fix-idle-load-balancing-in-softirqd-context [having some mailer issues. Pl ignore if this is a duplicate] This sounds like an issue in merge we recently had and 2.6.21-rc2-mm2 already has a fix for this. sched-fix-idle-load-balancing-in-softirqd-context-fix.patch Can you please apply both sched-fix-idle-load-balancing-in-softirqd-context sched-fix-idle-load-balancing-in-softirqd-context-fix.patch and see if you still see this problem? thanks, suresh