Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761887AbYBSJBb (ORCPT ); Tue, 19 Feb 2008 04:01:31 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751567AbYBSJBX (ORCPT ); Tue, 19 Feb 2008 04:01:23 -0500 Received: from brick.kernel.dk ([87.55.233.238]:2602 "EHLO kernel.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751309AbYBSJBW (ORCPT ); Tue, 19 Feb 2008 04:01:22 -0500 Date: Tue, 19 Feb 2008 10:01:19 +0100 From: Jens Axboe To: KAMEZAWA Hiroyuki Cc: Kamalesh Babulal , Linux Kernel Mailing List , linuxppc-dev@ozlabs.org, Ingo Molnar , Srivatsa Vaddagiri , Dhaval Giani , Andy Whitcroft , Balbir Singh Subject: Re: [BUG] Linux 2.6.25-rc2 - Regression from 2.6.24-rc1-git1 softlockup while bootup on powerpc Message-ID: <20080219090119.GQ23197@kernel.dk> References: <47B67E5E.4010001@linux.vnet.ibm.com> <20080217192913.GO23197@kernel.dk> <20080219170432.9c04376f.kamezawa.hiroyu@jp.fujitsu.com> <20080219083633.GN23197@kernel.dk> <20080219180242.0bbec245.kamezawa.hiroyu@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080219180242.0bbec245.kamezawa.hiroyu@jp.fujitsu.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1388 Lines: 36 On Tue, Feb 19 2008, KAMEZAWA Hiroyuki wrote: > On Tue, 19 Feb 2008 09:36:34 +0100 > Jens Axboe wrote: > > > On Tue, Feb 19 2008, KAMEZAWA Hiroyuki wrote: > > > On Sun, 17 Feb 2008 20:29:13 +0100 > > > Jens Axboe wrote: > > > > > > > It's odd stuff. Could you perhaps try and add some printks to > > > > block/cfq-iosched.c:call_for_each_cic(), like dumping the 'nr' return > > > > from radix_tree_gang_lookup() and the pointer value of cics[i] in the > > > > for() loop after the lookup? > > > > > > > I met the same issue on ia64/NUMA box. > > > seems cisc[]->key is NULL and index for radix_tree_gang_lookup() was > > > always '1'. > > > > Why does it keep repeating then? If ->key is NULL, the next lookup index > > should be 1UL. > > > > But I think the radix 'scan over entire tree' is a bit fragile. This > > patch adds a parallel hlist for ease of properly browsing the members, > > does that work for you? It compiles, but I haven't booted it here yet... > > > Works well for me and my box booted ! Super, I'll get it upstream. Thanks for testing and debugging! -- Jens Axboe -- 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/