linux-kernel - Re: gcc-10: kernel stack is corrupted and fails to boot

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Message-ID: <20200513222038.GC6733@zn.tnic>
Date:   Thu, 14 May 2020 00:20:38 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Arnd Bergmann <arnd@...db.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>,
        Kalle Valo <kvalo@...eaurora.org>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: gcc-10: kernel stack is corrupted and fails to boot

On Wed, May 13, 2020 at 11:49:49PM +0200, Arnd Bergmann wrote:
> Right, in particular since Linus started building with gcc-10 already and
> would likely soon run into that problem if he hasn't already ;-)

Oh noo, we don't want Linus' kernel broken. ;-)

We will send him the fix this weekend.

Looking at that branch:

https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/log/?h=x86/build

I think we can send the whole thing even.

Linus, shout if you'd prefer only the last three commits there:

950a37078aa0 x86/build: Use $(CONFIG_SHELL)
f670269a42bf x86: Fix early boot crash on gcc-10, next try
73da86741e7f x86/build: Check whether the compiler is sane

but the other three from Masahiro are simple cleanups:

675a59b7dec6 x86/boot/build: Add phony targets in arch/x86/boot/Makefile to PHONY
30ce434e44d7 x86/boot/build: Make 'make bzlilo' not depend on vmlinux or $(obj)/bzImage
e3c7c1052271 x86/boot/build: Add cpustr.h to targets and remove clean-files

which should be ok to take now too AFAICT.

Thx.

-- 
Regards/Gruss,
    Boris.

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