Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757956AbYFWKvj (ORCPT ); Mon, 23 Jun 2008 06:51:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756723AbYFWKvW (ORCPT ); Mon, 23 Jun 2008 06:51:22 -0400 Received: from E23SMTP01.au.ibm.com ([202.81.18.162]:39860 "EHLO e23smtp01.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755899AbYFWKvU (ORCPT ); Mon, 23 Jun 2008 06:51:20 -0400 Message-ID: <485F8028.1070302@linux.vnet.ibm.com> Date: Mon, 23 Jun 2008 16:21:20 +0530 From: Nageswara R Sastry User-Agent: Thunderbird 2.0.0.14 (X11/20080505) MIME-Version: 1.0 To: linux-kernel@vger.kernel.org CC: rnsastry@linux.vnet.ibm.com, balbir@linux.vnet.ibm.com, ego@linux.vnet.ibm.com, svaidy@linux.vnet.ibm.com Subject: [BUG] While changing the cpufreq governor, kernel hits a bug in workqueue.c Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5343 Lines: 175 Hi, While changing the cpufreq governor with the following script for about 30 minutes, the kernel hits a BUG in workqueue.c. Detailed trace attached. Script: #!/bin/bash while [ 1 ] do for govnrs in ondemand conservative do for cpu in 0 1 2 3 do echo $govnrs > /sys/devices/system/cpu/cpu${cpu}/cpufreq/scaling_governor if ! [ -d /sys/devices/system/cpu/cpu${cpu}/cpufreq/${govnrs} ] ; then echo "Error: Enable to create dir $govnrs" fi done done done Kernel stack trace: ------------[ cut here ]------------ kernel BUG at kernel/workqueue.c:223! invalid opcode: 0000 [#1] SMP Modules linked in: cpufreq_powersave cpufreq_conservative cpufreq_userspace usb_storage usbhid ehci_hcd ohci_hcd uhci_hcd usbcore Pid: 232, comm: kondemand/1 Not tainted (2.6.25.7 #1) EIP: 0060:[] EFLAGS: 00010286 CPU: 1 EIP is at queue_delayed_work_on+0x20/0x97 EAX: 00000000 EBX: c483ba94 ECX: c483ba94 EDX: 00000000 ESI: c483bab0 EDI: f7a3f708 EBP: 00000001 ESP: f7a69f40 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 Process kondemand/1 (pid: 232, ti=f7a68000 task=f794d020 task.ti=f7a68000) Stack: 00000000 f7a3e7b0 c483ba80 f7ab5e98 c041e54d 00000040 00000000 00000001 00000040 00000246 00000000 00000002 00000000 c012ee7f c483ba98 f7a3e7b0 c483ba94 f7a69f9c c012eeba 00000000 00000002 c012ee7f c041e31e c099e2a8 Call Trace: [] do_dbs_timer+0x22f/0x24f [] run_workqueue+0x81/0x187 [] run_workqueue+0xbc/0x187 [] run_workqueue+0x81/0x187 [] do_dbs_timer+0x0/0x24f [] worker_thread+0x0/0xbd [] worker_thread+0xb3/0xbd [] autoremove_wake_function+0x0/0x2d [] kthread+0x38/0x5d [] kthread+0x0/0x5d [] kernel_thread_helper+0x7/0x10 ======================= Code: c3 a1 dc da 6a c0 e9 78 ff ff ff 55 89 c5 57 89 d7 56 53 89 cb 8d 71 1c f0 0f ba 29 00 19 c0 31 d2 85 c0 75 76 83 79 1c 00 74 04 <0f> 0b eb fe 8d 41 04 39 41 04 74 04 0f 0b eb fe 89 f8 64 8b 15 EIP: [] queue_delayed_work_on+0x20/0x97 SS:ESP 0068:f7a69f40 ---[ end trace 40ca209e9f1ab79d ]--- Kernel tainted: # cat /proc/sys/kernel/tainted 128 # /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Xeon(R) CPU 5160 @ 3.00GHz stepping : 6 cpu MHz : 1992.000 cache size : 4096 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr dca lahf_lm bogomips : 5990.92 clflush size : 64 power management: This machine is having two Dual core. Core 0 information provided above. CPUID information: # ./cpuid CPU: vendor_id = "GenuineIntel" version information (1/eax): processor type = primary processor (0) family = Intel Pentium Pro/II/III/Celeron, AMD Athlon/Duron, Cyrix M2, VIA C3 (6) model = 0xf (15) stepping id = 0x6 (6) extended family = 0x0 (0) extended model = 0x0 (0) (simple synth) = Intel Core 2 Duo (Conroe/Allendale B2) / Core 2 Extreme Processor (Conroe B2) / Dual-Core Xeon Processor 5100 (Woodcrest B2), 65nm [...] feature information (1/ecx): PNI/SSE3: Prescott New Instructions = true MONITOR/MWAIT = true CPL-qualified debug store = true VMX: virtual machine extensions = true Enhanced Intel SpeedStep Technology = true thermal monitor 2 = true context ID: adaptive or shared L1 data = false cmpxchg16b available = true xTPR disable = true [...] Kernel configuration used: # CPU Frequency scaling CONFIG_CPU_FREQ=y CONFIG_CPU_FREQ_TABLE=y CONFIG_CPU_FREQ_DEBUG=y CONFIG_CPU_FREQ_STAT=y CONFIG_CPU_FREQ_STAT_DETAILS=y # CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set # CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE is not set # CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y # CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set CONFIG_CPU_FREQ_GOV_PERFORMANCE=y CONFIG_CPU_FREQ_GOV_POWERSAVE=m CONFIG_CPU_FREQ_GOV_USERSPACE=m CONFIG_CPU_FREQ_GOV_ONDEMAND=y CONFIG_CPU_FREQ_GOV_CONSERVATIVE=m # rpm -qa | egrep "binutils|gcc" binutils-2.17.50.0.6-2.el5 gcc-c++-4.1.1-52.el5 gcc-4.1.1-52.el5 libgcc-4.1.1-52.el5 gcc-gfortran-4.1.1-52.el5 # uname -a Linux x3550 2.6.25.7 #1 SMP Thu Jun 19 17:24:06 IST 2008 i686 i686 i386 GNU/Linux Could be able to reproduce the same on 2.6.26-rc6. Please let me know if you need more information. Please CC me as I am not subscribed. Thanks in advance. Regards R.Nageswara Sastry, CSTE?,C|EH?,CSTM? Linux Technology Center IBM India System & Technology Lab -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/