From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751696AbdBUJK6 (ORCPT ); Tue, 21 Feb 2017 04:10:58 -0500 Received: from mail-wr0-f194.google.com ([209.85.128.194]:35505 "EHLO mail-wr0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751099AbdBUJKw (ORCPT ); Tue, 21 Feb 2017 04:10:52 -0500 Subject: Re: Bug#855183: linux-image-4.9.0-0.bpo.1-amd64: modprobe intel_rapl_perf stay in uninterruptible sleep To: Thomas Gleixner References: <20170215080829.27308.94177.reportbug@imap.fsv.cvut.cz> <1487292582.22520.12.camel@decadent.org.uk> <194d53c8-0c2f-d70c-2aa4-de8af393c94f@gmail.com> Cc: Ben Hutchings , x86@kernel.org, 855183@bugs.debian.org, LKML , Peter Zijlstra , Kan Liang From: =?UTF-8?Q?Miloslav_H=c5=afla?= Message-ID: <33175c4f-c791-4b2d-8009-680a3fd8c7c4@gmail.com> Date: Tue, 21 Feb 2017 10:10:51 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.7.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Dne 21.02.2017 v 0:24 Thomas Gleixner napsal(a): > On Mon, 20 Feb 2017, Miloslav Hůla wrote: >> Dne 17.02.2017 v 11:47 Thomas Gleixner napsal(a): >>> What's really confusing is this information from the bug report: >>> >>> " When I changed: >>> >>> Power technology: >>> - from Energy Efficient >>> - to Custom >>> >>> Energy Performance BIAS Setting: >>> - from Balanced Performance >>> - to Performance >>> >>> problem disappeared. systemd-udevd starts normally, module can be >>> normally rmmod/insmod'ed now, load is 0.07." >>> >>> Miloslav: Is there any chance you can try a 4.10-rc8 kernel on that >>> machine? >> >> I compiled 4.10-rc8 kernel with a stock '/boot/config-4.9.0-0.bpo.1-amd64' >> config from Debian Jessie backports. Then I reverted BIOS settings to previous >> state and rebooted the server. Kernel and all modules loaded normally, >> rmmod/insmod intel_rapl_perf passed normally. >> >> Then, without any BIOS change, I rebooted with stock 4.9.0-0.bpo.1-amd64 and >> suprisingly, everything works, I cannot reproduce it. >> >> My knowledge on the field of BIOS are shallow. I don't know what I can do to >> reproduce the bug now. > > Did you just reboot or go through a cold start? That might make a difference. Reboot only. I'll test it again in next maintenance window. Regards, Milo