From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oleksandr Natalenko Subject: [BUG] oops in cpufreq driver with AMD Kaveri CPU Date: Tue, 05 Aug 2014 00:39:11 +0300 Message-ID: <4708675.eITUXPv8Ih@spock> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from natalenko.name ([78.47.77.148]:54988 "EHLO natalenko.name" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751939AbaHDVsn convert rfc822-to-8bit (ORCPT ); Mon, 4 Aug 2014 17:48:43 -0400 Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: linux-kernel@vger.kernel.org Cc: linux-pm@vger.kernel.org Hello. Occasionally I get my machine hung completely. Fortunately, I've got an= d saved=20 oops listing using netconsole before hang, and here it is [1]. Here is little piece of oops from the link above: =3D=3D=3D [15051.270461] BUG: unable to handle kernel paging request at 00000000f= f5ae8e4 [15051.271583] IP: [] srcu_notifier_call_chain+0xe/0x= 20 =E2=80=A6 [15051.956205] Call Trace: [15051.980641] [] ? __cpufreq_notify_transition+0x95= /0x1e0 [15052.005640] [] cpufreq_notify_transition+0x3e/0x7= 0 [15052.030240] [] cpufreq_freq_transition_begin+0xe8= /0x130 [15052.054522] [] ? ucs2_strncmp+0x70/0x70 [15052.078208] [] __target_index+0xbf/0x1a0 [15052.101348] [] __cpufreq_driver_target+0xfc/0x160 [15052.124250] [] od_check_cpu+0xa4/0xb0 [15052.146789] [] dbs_check_cpu+0x16c/0x1c0 [15052.168935] [] od_dbs_timer+0x11d/0x180 [15052.190607] [] process_one_work+0x17f/0x4c0 [15052.211825] [] worker_thread+0x11b/0x3f0 [15052.232490] [] ? create_and_start_worker+0x80/0x8= 0 [15052.253127] [] kthread+0xc9/0xe0 [15052.273292] [] ? flush_kthread_worker+0xb0/0xb0 [15052.293487] [] ret_from_fork+0x7c/0xb0 [15052.313544] [] ? flush_kthread_worker+0xb0/0xb0 =E2=80=A6 =3D=3D=3D Also here is my lspci [2] and cpuinfo [3] as well. Vanilla 3.15.8 and 3.16.0 are affected as well as latest Ubuntu 3.13 ke= rnel. No visible reason to trigger the bug. After hang machine doesn't respon= d via=20 network, there's no disk IO, and also it doesn't respond to pressing po= wer=20 button in order to perform soft off. [1] https://gist.github.com/085af9da81197faf6637 [2] https://gist.github.com/318ebda5576b099590b8 [3] https://gist.github.com/9c1307463c7ad6835b2d --=20 Oleksandr post-factum Natalenko, MSc pf-kernel community https://natalenko.name/