From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754213AbYGJMBM (ORCPT ); Thu, 10 Jul 2008 08:01:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752289AbYGJMA7 (ORCPT ); Thu, 10 Jul 2008 08:00:59 -0400 Received: from ug-out-1314.google.com ([66.249.92.169]:27051 "EHLO ug-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751482AbYGJMA5 (ORCPT ); Thu, 10 Jul 2008 08:00:57 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=date:to:subject:message-id:mime-version:content-type :content-disposition:user-agent:from; b=Bbb0Ydar3PcJ0PGPqNPfR6YYMwAD7Txjg9wqpATCHJa/nSvO8Jmh0Adc8D9wXfyKFr nnYb3t5/9QNysTAvSY3LZHEk4SF7G2iDSgUurJu0NZ2d+Y1d2tmU6ztW4i7HCoKRYaOO 8AYvKc0ixkGRaInSsnToIfqYUjg3xirIQSxEw= Date: Thu, 10 Jul 2008 13:59:55 +0200 To: Yanmin , Rusty Russell , Ingo Molnar , Peter Zijlstra , Dhaval Giani , Gautham R Shenoy , Heiko Carstens , Dmitry Adamushko , miaox@cn.fujitsu.com, Lai Jiangshan , Avi Kivity , linux-kernel@vger.kernel.org Subject: v2.6.26-rc9: kernel BUG at kernel/sched.c:5858! Message-ID: <20080710115954.GA3639@damson.getinternet.no> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.18 (2008-05-17) From: Vegard Nossum Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Looks like CPU hotplug still has some problems. Just got this on latest mainline, and I couldn't find the exact same report on LKML or kerneloops, maybe it can be helpful for debugging the existing problem(s)? lockdep: fixing up alternatives. ------------[ cut here ]------------ kernel BUG at kernel/sched.c:5858! invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC Pid: 3934, comm: bash Not tainted (2.6.26-rc9-00057-g60d678c #3) EIP: 0060:[] EFLAGS: 00210046 CPU: 0 EIP is at migration_call+0x495/0x4d0 EAX: 00000000 EBX: c0803f00 ECX: f6bd0000 EDX: 017b0000 ESI: e7d24fb0 EDI: c1fb3f00 EBP: f62e7e78 ESP: f62e7e48 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 Process bash (pid: 3934, ti=f62e6000 task=f60fbfc0 task.ti=f62e6000) Stack: 00000000 c06ddf70 f62e7e6c 00200246 c0803f00 00000001 c1fb3f00 f62e7e6c c0581fcf c074ec70 ffffffff 00000000 f62e7e98 c014d5a7 00000001 00000007 c074ecf4 ffffffff 00000001 e7c86f90 f62e7eac c014d619 ffffffff 00000000 Call Trace: [] ? preempt_schedule+0x3f/0x50 [] ? notifier_call_chain+0x37/0x70 [] ? __raw_notifier_call_chain+0x19/0x20 [] ? raw_notifier_call_chain+0x1a/0x20 [] ? _cpu_down+0x148/0x240 [] ? cpu_maps_update_begin+0xf/0x20 [] ? cpu_down+0x2b/0x40 [] ? store_online+0x39/0x80 [] ? store_online+0x0/0x80 [] ? sysdev_store+0x2b/0x40 [] ? sysfs_write_file+0xa2/0x100 [] ? vfs_write+0x96/0x130 [] ? sysfs_write_file+0x0/0x100 [] ? sys_write+0x3d/0x70 [] ? sysenter_past_esp+0x78/0xd1 ======================= Code: 45 e8 e8 2f 53 00 00 b8 01 00 00 00 e9 a2 fb ff ff bb 60 36 59 c0 eb 02 8b 1b 89 f8 ff 53 18 85 c0 89 c6 74 f3 90 e9 89 fe ff ff <0f> 0b eb fe 8d b4 26 00 00 00 00 e8 8b 82 bd ff 89 f0 50 9d 0f EIP: [] migration_call+0x495/0x4d0 SS:ESP 0068:f62e7e48 Oh, I just saw commit dc7fab8b3bb388c57c6c4a43ba68c8a32ca25204 Author: Dmitry Adamushko Date: Thu Jul 10 00:32:40 2008 +0200 sched: fix cpu hotplug will apply and retry. Is this likely to fix the oops I saw, though? Vegard $ grep SCHED .config CONFIG_HAVE_UNSTABLE_SCHED_CLOCK=y CONFIG_GROUP_SCHED=y CONFIG_FAIR_GROUP_SCHED=y CONFIG_RT_GROUP_SCHED=y CONFIG_USER_SCHED=y # CONFIG_CGROUP_SCHED is not set CONFIG_IOSCHED_NOOP=y CONFIG_IOSCHED_AS=y CONFIG_IOSCHED_DEADLINE=y CONFIG_IOSCHED_CFQ=y CONFIG_DEFAULT_IOSCHED="cfq" CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER=y CONFIG_SCHED_SMT=y CONFIG_SCHED_MC=y CONFIG_SCHED_HRTICK=y # CONFIG_NET_SCHED is not set # CONFIG_USB_EHCI_TT_NEWSCHED is not set CONFIG_SCHED_DEBUG=y CONFIG_SCHEDSTATS=y