Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934735AbcJTM3i (ORCPT ); Thu, 20 Oct 2016 08:29:38 -0400 Received: from mail-pf0-f170.google.com ([209.85.192.170]:34787 "EHLO mail-pf0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932289AbcJTM3f (ORCPT ); Thu, 20 Oct 2016 08:29:35 -0400 Date: Thu, 20 Oct 2016 13:29:31 +0100 From: Matt Fleming To: Dan Williams Cc: LKML , linux-efi@vger.kernel.org, Peter Jones , Ard Biesheuvel , Ingo Molnar Subject: Re: 4.9-rc1 boot regression, ambiguous bisect result Message-ID: <20161020122931.GD19876@codeblueprint.co.uk> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24+41 (02bc14ed1569) (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1036 Lines: 23 On Wed, 19 Oct, at 09:04:29PM, Dan Williams wrote: > Hi, > > I am currently unable to boot a Yoga 900 with latest mainline, but 4.8 boots. > > The symptom is a reboot before the video console is available. > > I bisected to commit 816e76129ed5 "efi: Allow drivers to reserve boot > services forever". However, that commit is known to be broken. The > proposed fix, commit 92dc33501bfb "x86/efi: Round EFI memmap > reservations to EFI_PAGE_SIZE", also exhibits the reboot problem. > > During the bisect some of the stopping points landed on commits that > caused the boot process to hang rather than cause a reboot. The > commits that resulted in a hang are marked "git bisect skip" in this > log: https://gist.github.com/djbw/1b501daa98192a42ae848f03bb59c30e > > I'll try treating those hangs as bad bisect results and re-run the > full bisect tomorrow. In the meantime I wonder if the bisect log > implicates a better regression candidate? Could you mail the dmesg output when booting a known working kernel with efi=debug ?