From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751811Ab0CHGDq (ORCPT ); Mon, 8 Mar 2010 01:03:46 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:62382 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751165Ab0CHGDk (ORCPT ); Mon, 8 Mar 2010 01:03:40 -0500 Message-ID: <4B94936B.8030409@cn.fujitsu.com> Date: Mon, 08 Mar 2010 14:04:27 +0800 From: Li Zefan User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1b3pre) Gecko/20090513 Fedora/3.0-2.3.beta2.fc11 Thunderbird/3.0b2 MIME-Version: 1.0 To: Steven Rostedt CC: Frederic Weisbecker , Lai Jiangshan , Ingo Molnar , LKML Subject: [BUG] WARNING: at kernel/trace/ring_buffer.c:3420 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org While running a ftrace test, a kernel warning showed up. The bug is not so easy to reproduce, normally it takes 30 mins to 2 hours. After revering 3c05d7482777f15e71bb4cb1ba78dee2800dfec6, I ran the test for 15 hours, and the bug seems disapeared. ------------[ cut here ]------------ WARNING: at kernel/trace/ring_buffer.c:3420 ring_buffer_reset_cpu+0x5a/0x9c() Hardware name: PRIMERGY Modules linked in: ipt_MASQUERADE iptable_nat nf_nat bridge stp llc deflate zlib_deflate ctr camellia cast5 rmd160 crypto_null ccm serpent blowfish twofish_x86_64 twofish_common ecb xcbc cbc sha256_generic sha512_generic des_generic cryptd aes_x86_64 aes_generic ah6 ah4 esp6 esp4 xfrm4_mode_beet xfrm4_tunnel tunnel4 xfrm4_mode_tunnel xfrm4_mode_transport xfrm6_mode_transport xfrm6_mode_beet ipcomp ipcomp6 xfrm_ipcomp xfrm6_tunnel tunnel6 af_key autofs4 sunrpc ipv6 dm_mirror dm_region_hash dm_log dm_multipath uinput i5k_amb hwmon e1000e i5000_edac edac_core iTCO_wdt iTCO_vendor_support shpchp i2c_i801 i2c_core serio_raw pcspkr pata_acpi ata_generic mptsas mptscsih ata_piix mptbase scsi_transport_sas dm_mod [last unloaded: speedstep_lib] Pid: 2108, comm: ftrace_current_ Tainted: G W 2.6.33-tip+ #2 Call Trace: [] warn_slowpath_common+0x7c/0x94 [] warn_slowpath_null+0x14/0x16 [] ring_buffer_reset_cpu+0x5a/0x9c [] tracing_reset_online_cpus+0x4a/0x79 [] tracer_init+0x15/0x20 [] tracing_set_tracer+0x1c2/0x1e7 [] ? might_fault+0x5c/0xac [] tracing_set_trace_write+0x8c/0xbc [] ? trace_buffer_lock_reserve+0x21/0x56 [] ? trace_current_buffer_lock_reserve+0x16/0x18 [] ? retint_swapgs+0x13/0x1b [] vfs_write+0xae/0x10b [] sys_write+0x4a/0x6e [] tracesys+0xd0/0xd5 ---[ end trace f7002f0890d5b023 ]---