linux-kernel - Re: CONFIG_PAGE_TABLE_ISOLATION=y on x86_64 causes gcc to segfault when building x86

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Message-ID: <20180103154008.7rd4moyd2f7t3wt5@pd.tnic>
Date:   Wed, 3 Jan 2018 16:40:08 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Lars Wendler <wendler.lars@....de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Greg KH <gregkh@...uxfoundation.org>
Subject: Re: CONFIG_PAGE_TABLE_ISOLATION=y on x86_64 causes gcc to segfault
 when building x86_32 binaries

On Wed, Jan 03, 2018 at 02:30:36PM +0100, Lars Wendler wrote:
> Same problem with 4.15-rc6. So I suppose that means it's a general
> issue.

So gentoo recently broke the kernel, see

3ce120b16cc5 ("kbuild: add '-fno-stack-check' to kernel build options")

and you say you hit the same problem with -rc6 and that commit is in
there so your kernel is probably built with -fno-stack-check.

Just a stab in the dark though: if you build your hello world program
with -fno-stack-check, does it segfault still?

Thx.

-- 
Regards/Gruss,
    Boris.

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