From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754819Ab2BEE26 (ORCPT ); Sat, 4 Feb 2012 23:28:58 -0500 Received: from mga03.intel.com ([143.182.124.21]:56426 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751798Ab2BEE25 (ORCPT ); Sat, 4 Feb 2012 23:28:57 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.71,315,1320652800"; d="scan'208";a="103396041" Message-ID: <4F2E0586.2090803@intel.com> Date: Sun, 05 Feb 2012 12:28:54 +0800 From: Alex Shi User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:9.0) Gecko/20111229 Thunderbird/9.0 MIME-Version: 1.0 To: "Chen, Tim C" , "Li, Shaohua" CC: "linux-kernel@vger.kernel.org" Subject: a non producible kernel panic Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When do performance testing for rc2 kernel on our NHM EX machine( 4 sockets * 8 cores), I find a kernel panic. but never reproduced it. and didn't find some useful info after enable lockdep, rcu debug etc. Any ideas on this? INFO: task umount:4280 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. umount D ffff883025443198 0 4280 4235 0x00000080 ffff883027805d28 0000000000000086 ffff883025442de0 ffff883027805fd8 ffff883027805fd8 0000000000013100 ffff8810292eade0 ffff883025442de0 0000000000000018 7fffffffffffffff 7fffffffffffffff ffffffff81c180c8 Call Trace: [] schedule+0x55/0x57 [] schedule_timeout+0x2f/0xd9 [] ? rcu_panic+0x12/0x12 [] ? physflat_send_IPI_allbutself+0x12/0x14 [] ? native_send_call_func_ipi+0x71/0x91 [] wait_for_common+0x95/0xeb [] ? try_to_wake_up+0x1e0/0x1e0 [] ? rcu_panic+0x12/0x12 [] ? call_rcu_bh+0x12/0x12 [] wait_for_completion+0x18/0x1a [] _rcu_barrier+0x96/0xa6 [] rcu_barrier_sched+0x17/0x19 [] rcu_barrier+0x9/0xb [] deactivate_locked_super+0x32/0x52 [] deactivate_super+0x32/0x36 [] mntput_no_expire+0xde/0xe7 [] sys_umount+0x2cd/0x2ff [] ? path_put+0x1a/0x1e [] system_call_fastpath+0x16/0x1b INFO: task umount:4280 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. umount D ffff883025443198 0 4280 4235 0x00000080 ffff883027805d28 0000000000000086 ffff883025442de0 ffff883027805fd8 ffff883027805fd8 0000000000013100 ffff8810292eade0 ffff883025442de0 0000000000000018 7fffffffffffffff 7fffffffffffffff ffffffff81c18