From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752693Ab1KCVpt (ORCPT ); Thu, 3 Nov 2011 17:45:49 -0400 Received: from mail-yw0-f46.google.com ([209.85.213.46]:43076 "EHLO mail-yw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752439Ab1KCVps (ORCPT ); Thu, 3 Nov 2011 17:45:48 -0400 Date: Thu, 3 Nov 2011 14:39:59 -0700 From: Tejun Heo To: Andrew Watts Cc: Dmitry Torokhov , linux-kernel@vger.kernel.org, linux-pm@lists.linux-foundation.org Subject: Re: [REGRESSION]: hibernate/sleep regression w/ bisection Message-ID: <20111103213959.GP4417@google.com> References: <20111101124759.GA1326@zeus> <20111102054658.GA29035@core.coreip.homeip.net> <20111102160208.GA6657@zeus> <20111102163109.GA29430@core.coreip.homeip.net> <20111103155956.GG4417@google.com> <20111103184559.GA3295@zeus> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20111103184559.GA3295@zeus> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, Andrew. On Thu, Nov 03, 2011 at 01:46:19PM -0500, Andrew Watts wrote: > On Thu, Nov 03, 2011 at 08:59:56AM -0700, Tejun Heo wrote: > > Andrew, just in case, can you please double check that you're > > reverting only that single commit (not all the ones afterwards) and > > the test results? If they're all okay, can you please trigger the > > problem, wait a while, trigger sysrq-t and attach the kernel log? > > Hi Tejun. > > I am only reverting 8ee294cd9def0004887da7f44b80563493b0a097 though I first > revert part of 1d64b655dc083df5c5ac39945ccbbc6532903bf1 so it reverts > cleanly. > > I am very sure of my test results; normally I get 4-5 bad resumes on a 20 > hibernate loop and get no bad resumes with the commit reverted. I have > been very thorough in my testing to ensure I am not generating false > positives or false negatives (repeating the loops many times). Thanks. Yeah, this is odd & interesting. > Below is the output you asked for (sysrq t). > > Thanks. > > ~ Andy > > ====================== > > > kernel: [ 345.226523] SysRq : Show State > kernel: [ 345.226531] task PC stack pid father > kernel: [ 345.226535] init S f4a47b68 5488 1 0 0x00000000 > kernel: [ 345.226765] kthreadd S 00000000 7172 2 0 0x00000000 This is missing all stack traces. Can you please turn on FRAME_POINTER and adjust log level such that all stack dumps are included too? Thank you. -- tejun