From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764446AbZFQD27 (ORCPT ); Tue, 16 Jun 2009 23:28:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754003AbZFQD2u (ORCPT ); Tue, 16 Jun 2009 23:28:50 -0400 Received: from tomts40.bellnexxia.net ([209.226.175.97]:61973 "EHLO tomts40-srv.bellnexxia.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753438AbZFQD2t (ORCPT ); Tue, 16 Jun 2009 23:28:49 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AlEGANf4N0pMROLw/2dsb2JhbACBUNE1hAsF Date: Tue, 16 Jun 2009 23:16:24 -0400 From: Mathieu Desnoyers To: Ingo Molnar Cc: linux-kernel@vger.kernel.org Subject: [2.6.30 BUG] CPU hotplug and alternatives problem when going 2 -> 1 CPU Message-ID: <20090617031624.GA30905@Krystal> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline X-Editor: vi X-Info: http://krystal.dyndns.org:8080 X-Operating-System: Linux/2.6.21.3-grsec (i686) X-Uptime: 23:11:43 up 108 days, 23:37, 4 users, load average: 0.34, 0.26, 0.41 User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, I ran into a "stucked process" when trying to bring down all my CPUs on a 2.6.30 kernel (+ lttng patchset). It's Intel Core2 Xeon. My printk output showed : [ 133.866683] CPU 1 is now offline [ 134.958702] CPU 2 is now offline [ 136.054832] CPU 3 is now offline [ 137.148867] CPU 4 is now offline [ 138.252997] CPU 5 is now offline [ 139.455014] CPU 6 is now offline [ 140.561271] CPU 7 is now offline [ 140.570979] SMP alternatives: switching to UP code Booting with noreplace-smp makes everything work fine. Maybe it's a new bug in 2.6.30 ? Mathieu -- Mathieu Desnoyers OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68