linux-kernel - Re: 4.17.x won't boot due to "x86/boot/compressed/64: Handle 5-level paging boot if kernel is above 4G"

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Date:   Tue, 3 Jul 2018 23:10:27 -0400
From:   Benjamin Gilbert <bgilbert@...hat.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     Gabriel C <nix.or.die@...il.com>, linux-x86_64@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
        bero@...dev.ch, Andi Kleen <ak@...ux.intel.com>
Subject: Re: 4.17.x won't boot due to "x86/boot/compressed/64: Handle 5-level
 paging boot if kernel is above 4G"

On Tue, Jul 03, 2018 at 05:21:50PM +0300, Kirill A. Shutemov wrote:
> I don't know how to solve it. As far as I know we don't support compiling
> kernel with LTO in mainline.
> 
> Any suggestions?
> 
> Benjamin, do you change LDFLAGS or CFLAGS when compiling the kernel?

We're using the standard build flags as far as I can tell.  In particular,
we don't enable LTO, and I've verified that -flto isn't in the build logs.

Here's a sample image:

https://users.developer.core-os.net/bgilbert/4.17/vmlinuz-4.17.3-coreos
https://users.developer.core-os.net/bgilbert/4.17/vmlinux-4.17.3-coreos
https://users.developer.core-os.net/bgilbert/4.17/System.map

--Benjamin Gilbert