From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934982Ab1KJOzH (ORCPT ); Thu, 10 Nov 2011 09:55:07 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:59764 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933896Ab1KJOzB (ORCPT ); Thu, 10 Nov 2011 09:55:01 -0500 Date: Thu, 10 Nov 2011 15:53:20 +0100 From: Ingo Molnar To: Andreas Bombe Cc: Peter Zijlstra , linux-kernel@vger.kernel.org Subject: Re: [REGRESSION] perf merge breaks resume from standby, bisected Message-ID: <20111110145319.GB29614@elte.hu> References: <20111101173847.GA4142@amos.fritz.box> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20111101173847.GA4142@amos.fritz.box> User-Agent: Mutt/1.5.21 (2010-09-15) X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=AWL,BAYES_00 autolearn=no SpamAssassin version=3.3.1 -2.0 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] 0.0 AWL AWL: From: address is in the auto white-list Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Andreas Bombe wrote: > I found that resuming from suspend to memory stopped working with the > recent merges to mainline after 3.1. I have observed different modes of > failure even with the same version. Most often I just get the blinking > caps/scroll lock LEDs on the keyboard and no video output. > > Sometimes I get the normal text output from a resume ending with an oops > dump. It has been mostly NULL pointer dereferences, but I think there > was a scheduling in atomic context at one time. I have a photo of the > NULL deref on the latest kernel attached, according to gdb the IP points > to the return statement of the event_sched_out() function. > > Anyway, I bisected the problem down to 144060f "perf: Add PM notifiers > to fix CPU hotplug races". The hardware is a Core 2 Duo E8500 on an Asus > P5Q, config attached. v3.2-rc1 should have this resolved, the commit got reverted. Thanks, Ingo