Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263743AbTFJRcT (ORCPT ); Tue, 10 Jun 2003 13:32:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263749AbTFJRcT (ORCPT ); Tue, 10 Jun 2003 13:32:19 -0400 Received: from e34.co.us.ibm.com ([32.97.110.132]:22434 "EHLO e34.co.us.ibm.com") by vger.kernel.org with ESMTP id S263743AbTFJRcM (ORCPT ); Tue, 10 Jun 2003 13:32:12 -0400 Date: Tue, 10 Jun 2003 10:34:31 -0700 From: "Martin J. Bligh" To: Andrew Morton cc: linux-kernel@vger.kernel.org Subject: Re: 2.5.70 (virgin) hangs running SDET Message-ID: <12190000.1055266471@flay> In-Reply-To: <5930000.1055254447@[10.10.2.4]> References: <60380000.1055188542@flay> <20030609140834.11ad0d63.akpm@digeo.com> <5930000.1055254447@[10.10.2.4]> X-Mailer: Mulberry/2.1.2 (Linux/x86) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1240 Lines: 34 >> The ps instance which is spinning on kernel_flag in proc_root_lookup is >> what's holding things up. >> >> Or is it spinning in proc_lookup() or proc_pid_lookup()? I have a vague >> feeling that I've seen these traces miss out the innermost stack slot... >> >> Suggest: >> >> a) Use CONFIG_SPINLINE, get a new sysrq-T trace >> >> b) Enable spinlock debugging >> >> c) Try disabling the sched_balance_exec() code. > > > Moving that locking around as discussed last night didn't fix it. > It did last 2.5 cycles of repeated SDET this time instead of 0.5, > but that might just be coincidence, as the hang looks the same. Got > a better backtrace out of her this time though .... > > Want me to back out the patch I was pointing fingers at? Or I can > carry on with the path you suggested above if you think it'll help ... OK, well backing out dcache_lock-vs-tasklist_lock-take-3.patch does indeed seem to fix the problem. It's done 5.5 whole cycles now, and still going strong. M. - 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/