Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755068AbZGUUHv (ORCPT ); Tue, 21 Jul 2009 16:07:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754035AbZGUUHu (ORCPT ); Tue, 21 Jul 2009 16:07:50 -0400 Received: from mailrelay004.isp.belgacom.be ([195.238.6.170]:15493 "EHLO mailrelay004.isp.belgacom.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752721AbZGUUHu (ORCPT ); Tue, 21 Jul 2009 16:07:50 -0400 X-Belgacom-Dynamic: yes X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AsABADu9ZUpbsl3Z/2dsb2JhbAAI0wSEDAWBQA Subject: 2.6.31-rc3 cpufreq bug (null pointer dereference) From: Christophe Lermytte To: linux-kernel@vger.kernel.org Content-Type: text/plain Date: Tue, 21 Jul 2009 22:07:49 +0200 Message-Id: <1248206869.4516.6.camel@localhost> Mime-Version: 1.0 X-Mailer: Evolution 2.26.2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3085 Lines: 65 Today, I tried to change the governor to conservative using the GNOME cpufreqd applet. The applet subsequently hangs and the following appears in the kernel traces: [ 3067.249054] BUG: unable to handle kernel NULL pointer dereference at 00000020 [ 3067.249062] IP: [] dbs_cpufreq_notifier+0x17/0x2b [ 3067.249074] *pde = 00000000 [ 3067.249078] Oops: 0000 [#1] SMP [ 3067.249083] last sysfs file: /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor [ 3067.249087] Modules linked in: cdc_wdm cdc_acm [ 3067.249093] [ 3067.249098] Pid: 1346, comm: kondemand/1 Not tainted (2.6.31-rc3 #2) Latitude D630 [ 3067.249103] EIP: 0060:[] EFLAGS: 00010286 CPU: 1 [ 3067.249108] EIP is at dbs_cpufreq_notifier+0x17/0x2b [ 3067.249112] EAX: 00000000 EBX: f6959f00 ECX: 00000000 EDX: c278c300 [ 3067.249116] ESI: fffffffe EDI: 00000000 EBP: 00000000 ESP: f6959e78 [ 3067.249120] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 [ 3067.249124] Process kondemand/1 (pid: 1346, ti=f6958000 task=f69020a0 task.ti=f6958000) [ 3067.249128] Stack: [ 3067.249130] c161ba54 c1427067 f6959f00 00000000 c176d000 f6959f00 c176cfe4 00000000 [ 3067.249139] <0> c103a57e ffffffff 00000000 00000000 00000001 f64de590 f8416980 f6959f00 [ 3067.249149] <0> c103a59c ffffffff 00000000 c100f8b0 f6bcf240 ffffffea 00000003 00000000 [ 3067.249160] Call Trace: [ 3067.249166] [] ? notifier_call_chain+0x2a/0x47 [ 3067.249175] [] ? __srcu_notifier_call_chain+0x32/0x47 [ 3067.249181] [] ? srcu_notifier_call_chain+0x9/0xc [ 3067.249193] [] ? acpi_cpufreq_target+0x1a7/0x2b1 [ 3067.249197] [] ? get_measured_perf+0x1f/0x140 [ 3067.249201] [] ? getnstimeofday+0x4d/0xd0 [ 3067.249205] [] ? cpufreq_register_driver+0xb1/0x15b [ 3067.249209] [] ? acpi_cpufreq_target+0x0/0x2b1 [ 3067.249213] [] ? __cpufreq_driver_target+0x49/0x55 [ 3067.249217] [] ? do_dbs_timer+0x262/0x2b8 [ 3067.249222] [] ? worker_thread+0x137/0x1b3 [ 3067.249226] [] ? do_dbs_timer+0x0/0x2b8 [ 3067.249229] [] ? autoremove_wake_function+0x0/0x2d [ 3067.249233] [] ? worker_thread+0x0/0x1b3 [ 3067.249236] [] ? kthread+0x69/0x6e [ 3067.249240] [] ? kthread+0x0/0x6e [ 3067.249244] [] ? kernel_thread_helper+0x7/0x10 [ 3067.249246] Code: c7 44 24 18 ea ff ff ff 8b 44 24 18 83 c4 20 5b 5e 5f 5d c3 53 8b 01 ba 00 83 6c c1 89 cb 03 14 85 6c b9 66 c1 8b 4a 18 8b 42 60 <3b> 41 20 77 05 3b 41 1c 73 06 8b 43 08 89 42 60 31 c0 5b c3 53 [ 3067.249282] EIP: [] dbs_cpufreq_notifier+0x17/0x2b SS:ESP 0068:f6959e78 [ 3067.249287] CR2: 0000000000000020 [ 3067.249296] ---[ end trace 5cb870966b6883a7 ]--- If you need more info, please let me now. Regards, Christophe Lermytte -- 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/