From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757082AbYJGVDy (ORCPT ); Tue, 7 Oct 2008 17:03:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751947AbYJGVDo (ORCPT ); Tue, 7 Oct 2008 17:03:44 -0400 Received: from one.firstfloor.org ([213.235.205.2]:42545 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754026AbYJGVDn (ORCPT ); Tue, 7 Oct 2008 17:03:43 -0400 Date: Tue, 7 Oct 2008 23:09:47 +0200 From: Andi Kleen To: "Paul E. McKenney" Cc: Andi Kleen , mingo@elte.hu, linux-kernel@vger.kernel.org, rjw@sisk.pl, dipankar@in.ibm.com, tglx@linuxtronix.de Subject: Re: RCU hang on cpu re-hotplug with 2.6.27rc8 Message-ID: <20081007210947.GP20740@one.firstfloor.org> References: <20081006141220.GA14160@basil.nowhere.org> <20081006232837.GA1157@basil.nowhere.org> <20081007030822.GC6820@linux.vnet.ibm.com> <20081007071544.GC20740@one.firstfloor.org> <20081007152629.GH6384@linux.vnet.ibm.com> <20081007154939.GN20740@one.firstfloor.org> <20081007163401.GJ6384@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20081007163401.GJ6384@linux.vnet.ibm.com> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 07, 2008 at 09:34:01AM -0700, Paul E. McKenney wrote: > Thank you! Hmmm, classic RCU, worked just fine in 2.6.27-rc7 with > Thomas's patch. I was doing random onlines and offlines in a loop, > with about 3 seconds between each operation continuously for more than > ten hours, both x86 and Power. So could you please try 2.6.27-rc7 with > Thomas's patch as follows? > > http://www.rdrop.com/users/paulmck/patches/2.6.27-rc7-tglx-timer-1.patch Same effect. Hung on the first try bash D 00000000ffff25c1 0 4755 4742 ffff88027b127bf8 0000000000000086 ffff88027b127c18 0000000000000296 ffff88027c80b330 ffff8804be488b90 ffff88027c80b578 0000000300000296 ffff88027b127c18 ffffffff808cbd18 ffff88002805d600 ffff88027d182098 Call Trace: [] schedule_timeout+0x22/0xb4 [] ? __switch_to+0x320/0x330 [] ? cpupri_set+0xc5/0xd8 [] wait_for_common+0xcd/0x131 [] ? default_wake_function+0x0/0xf [] wait_for_completion+0x18/0x1a [] synchronize_rcu+0x35/0x3c [] ? wakeme_after_rcu+0x0/0x12 [] partition_sched_domains+0x9b/0x1dd [] ? wake_up_process+0x10/0x12 [] update_sched_domains+0x2e/0x35 [] notifier_call_chain+0x33/0x5b [] __raw_notifier_call_chain+0x9/0xb [] raw_notifier_call_chain+0xf/0x11 [] _cpu_up+0xd3/0x10c [] cpu_up+0x57/0x67 [] store_online+0x4d/0x75 [] sysdev_store+0x1b/0x1d [] sysfs_write_file+0xe0/0x11c [] vfs_write+0xae/0x137 [] sys_write+0x47/0x6f [] system_call_fastpath+0x16/0x1b -Andi -- ak@linux.intel.com