Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753580Ab0K2LuT (ORCPT ); Mon, 29 Nov 2010 06:50:19 -0500 Received: from canuck.infradead.org ([134.117.69.58]:34461 "EHLO canuck.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753547Ab0K2LuR convert rfc822-to-8bit (ORCPT ); Mon, 29 Nov 2010 06:50:17 -0500 Subject: Re: Scheduler grouping failure; division by zero in select_task_rq_fair From: Peter Zijlstra To: Ben Hutchings Cc: Frede_Feuerstein@gmx.net, Ingo Molnar , 603229@bugs.debian.org, LKML , Tejun Heo In-Reply-To: <1290975266.3292.316.camel@localhost> References: <1290449310.3868.13.camel@localhost> <1290470134.6770.929.camel@localhost> <1290514638.3892.16.camel@localhost> <1290900814.3292.84.camel@localhost> <1290920436.4255.1025.camel@localhost> <1290975266.3292.316.camel@localhost> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Date: Mon, 29 Nov 2010 12:50:25 +0100 Message-ID: <1291031425.32004.16.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2606 Lines: 61 On Sun, 2010-11-28 at 20:14 +0000, Ben Hutchings wrote: > [ 0.856002] Pid: 2, comm: kthreadd Not tainted 2.6.32-5-amd64 #1 W1100z/2100z What's in that kernel? is that simply the latest .32-stable? > [ 0.536554] CPU0 attaching sched-domain: > [ 0.540004] domain 0: span 0-1 level MC > [ 0.548002] groups: 0 1 > [ 0.560003] domain 1: span 0-3 level NODE > [ 0.568002] groups: > [ 0.574179] ERROR: domain->cpu_power not set > [ 0.576002] > [ 0.580002] ERROR: groups don't span domain->span > [ 0.584004] CPU1 attaching sched-domain: > [ 0.588007] domain 0: span 0-1 level MC > [ 0.596002] groups: 1 0 (cpu_power = 1023) > [ 0.612002] ERROR: parent span is not a superset of domain->span > [ 0.616003] domain 1: span 1-3 level CPU > [ 0.624002] groups: 1 (cpu_power = 2048) 2-3 (cpu_power = 2048) > [ 0.644003] domain 2: span 0-3 level NODE > [ 0.652004] groups: 1-3 (cpu_power = 4096) > [ 0.668002] ERROR: domain->cpu_power not set > [ 0.672002] > [ 0.676002] ERROR: groups don't span domain->span > [ 0.680004] CPU2 attaching sched-domain: > [ 0.684003] domain 0: span 2-3 level MC > [ 0.692003] groups: 2 3 > [ 0.704003] domain 1: span 1-3 level CPU > [ 0.712003] groups: 2-3 (cpu_power = 2048) 1 (cpu_power = 2048) > [ 0.736003] domain 2: span 0-3 level NODE > [ 0.744003] groups: 1-3 (cpu_power = 4096) > [ 0.760003] ERROR: domain->cpu_power not set > [ 0.764003] > [ 0.768003] ERROR: groups don't span domain->span > [ 0.772004] CPU3 attaching sched-domain: > [ 0.776003] domain 0: span 2-3 level MC > [ 0.784003] groups: 3 2 > [ 0.794183] domain 1: span 1-3 level CPU > [ 0.800003] groups: 2-3 (cpu_power = 2048) 1 (cpu_power = 2048) > [ 0.822183] domain 2: span 0-3 level NODE > [ 0.828003] groups: 1-3 (cpu_power = 4096) > [ 0.842180] ERROR: domain->cpu_power not set > [ 0.844003] > [ 0.848003] ERROR: groups don't span domain->span Hrm that smells like the architecture topology setup is wrecked, looks like the NUMA setup is bonkers. I really know very little about that code, I think Tejun recently poked at that in an attempt to merge 32 and 64bit x86. Also, its very weird CPU0 only gets to have 2 domains, while the other 3 get 3 domains.. Ingo, who knows this stuff? -- 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/