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Date:   Thu, 20 Oct 2016 12:37:16 -0700
From:   Dan Williams <>
To:     Matt Fleming <>
Cc:     LKML <>,,
        Peter Jones <>,
        Ard Biesheuvel <>,
        Ingo Molnar <>
Subject: Re: 4.9-rc1 boot regression, ambiguous bisect result

On Thu, Oct 20, 2016 at 8:22 AM, Dan Williams <> wrote:
> On Thu, Oct 20, 2016 at 5:29 AM, Matt Fleming <> wrote:
>> 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:
>>> 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 ?
> Here it is:

I am able to build a kernel and boot the platform with the following
set of reverts:

      Revert "x86/efi: Round EFI memmap reservations to EFI_PAGE_SIZE"
      Revert "x86/efi-bgrt: Use efi_mem_reserve() to avoid copying image data"
      Revert "efi/esrt: Use efi_mem_reserve() and avoid a kmalloc()"
      Revert "efi: Allow drivers to reserve boot services forever"

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