From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752766Ab0CZMXk (ORCPT ); Fri, 26 Mar 2010 08:23:40 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33792 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751473Ab0CZMXj convert rfc822-to-8bit (ORCPT ); Fri, 26 Mar 2010 08:23:39 -0400 Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <2375c9f91003251943r4663ae51r5791acc374b6ccc4@mail.gmail.com> References: <2375c9f91003251943r4663ae51r5791acc374b6ccc4@mail.gmail.com> <1264740107.20211.53.camel@pasglop> <6397.1269516539@redhat.com> To: =?us-ascii?Q?=3D=3FUTF-8=3FQ=3FAm=3DC3=3DA9rico=5FWang=3F=3D?= , torvalds@osdl.org, akpm@linux-foundation.org Cc: dhowells@redhat.com, Benjamin Herrenschmidt , "linux-kernel\@vger.kernel.org" , Ingo Molnar , Peter Zijlstra , Johannes Berg Subject: Re: [2.6.33-rc5] Weird deadlock when shutting down MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8BIT Date: Fri, 26 Mar 2010 12:22:02 +0000 Message-ID: <6253.1269606122@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Américo Wang wrote: > > ======================================================= > > [ INFO: possible circular locking dependency detected ] > > 2.6.34-rc2-cachefs #115 > > ------------------------------------------------------- > > halt/2291 is trying to acquire lock: > >  (s_active#31){++++.+}, at: [] sysfs_addrm_finish+0x31/0x5a > > > > but task is already holding lock: > >  (&per_cpu(cpu_policy_rwsem, cpu)){+++++.}, at: [] lock_policy_rwsem_write+0x4a/0x7b > > > > which lock already depends on the new lock. > > > > > I already send a patch for this: > > https://patchwork.kernel.org/patch/83558/ > > It is still in -mm tree, I think. Tested-by: David Howells