Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752067AbcJTEEc (ORCPT ); Thu, 20 Oct 2016 00:04:32 -0400 Received: from mail-it0-f54.google.com ([209.85.214.54]:36357 "EHLO mail-it0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751194AbcJTEEa (ORCPT ); Thu, 20 Oct 2016 00:04:30 -0400 MIME-Version: 1.0 From: Dan Williams Date: Wed, 19 Oct 2016 21:04:29 -0700 Message-ID: Subject: 4.9-rc1 boot regression, ambiguous bisect result To: Matt Fleming Cc: LKML , linux-efi@vger.kernel.org, Peter Jones , Ard Biesheuvel , Ingo Molnar Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 861 Lines: 19 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?