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Re: 4.9-rc1 boot regression, ambiguous bisect result

From Matt Fleming <matt@codeblueprint.co.uk>
Newsgroups linux.kernel
Subject Re: 4.9-rc1 boot regression, ambiguous bisect result
Date 2016-10-21 17:50 +0200
Message-ID <suKf0-7AT-21@gated-at.bofh.it> (permalink)
References <sucQ1-2td-1@gated-at.bofh.it> <sukDU-7vO-21@gated-at.bofh.it> <suns6-Ws-7@gated-at.bofh.it> <surm1-3pA-9@gated-at.bofh.it>
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On Thu, 20 Oct, at 12:37:16PM, Dan Williams wrote:
> 
> 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"

FYI, I've been able to reproduce some crash when using your EFI memory
map layout under Qemu and forcing the ESRT driver to reserve the space.

It looks like the new EFI memmap we allocate as part of the
reservation is smaller than the old one - which is backwards.

Still debugging...

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4.9-rc1 boot regression, ambiguous bisect result Dan Williams <dan.j.williams@intel.com> - 2016-10-20 06:10 +0200
  Re: 4.9-rc1 boot regression, ambiguous bisect result Ingo Molnar <mingo@kernel.org> - 2016-10-20 08:30 +0200
  Re: 4.9-rc1 boot regression, ambiguous bisect result Matt Fleming <matt@codeblueprint.co.uk> - 2016-10-20 14:30 +0200
    Re: 4.9-rc1 boot regression, ambiguous bisect result Dan Williams <dan.j.williams@intel.com> - 2016-10-20 17:30 +0200
      Re: 4.9-rc1 boot regression, ambiguous bisect result Dan Williams <dan.j.williams@intel.com> - 2016-10-20 21:40 +0200
        Re: 4.9-rc1 boot regression, ambiguous bisect result Ingo Molnar <mingo@kernel.org> - 2016-10-21 09:10 +0200
          Re: 4.9-rc1 boot regression, ambiguous bisect result Dan Williams <dan.j.williams@intel.com> - 2016-10-21 20:30 +0200
        Re: 4.9-rc1 boot regression, ambiguous bisect result Matt Fleming <matt@codeblueprint.co.uk> - 2016-10-21 17:50 +0200
          Re: 4.9-rc1 boot regression, ambiguous bisect result Matt Fleming <matt@codeblueprint.co.uk> - 2016-10-21 22:30 +0200
            Re: 4.9-rc1 boot regression, ambiguous bisect result Dan Williams <dan.j.williams@intel.com> - 2016-10-22 01:30 +0200

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