linux-kernel - Re: AMD boot woe due to "x86/mm: Cleanup pgprot_4k_2_large() and pgprot_large_2

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Message-ID: <20200422161757.GC26846@zn.tnic>
Date:   Wed, 22 Apr 2020 18:17:57 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Qian Cai <cai@....pw>
Cc:     Christoph Hellwig <hch@....de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        kasan-dev <kasan-dev@...glegroups.com>
Subject: Re: AMD boot woe due to "x86/mm: Cleanup pgprot_4k_2_large() and
 pgprot_large_2_4k()"

On Wed, Apr 22, 2020 at 11:55:54AM -0400, Qian Cai wrote:
> Reverted the linux-next commit and its dependency,
> 
> a85573f7e741 ("x86/mm: Unexport __cachemode2pte_tbl”)
> 9e294786c89a (“x86/mm: Cleanup pgprot_4k_2_large() and pgprot_large_2_4k()”)
> 
> fixed crashes or hard reset on AMD machines during boot that have been flagged by
> KASAN in different forms indicating some sort of memory corruption with this config,
> 
> https://raw.githubusercontent.com/cailca/linux-mm/master/x86.config

What is the special thing about this config? You have KASAN enabled and?
Anything else?

I need to know what are the relevant switches you've enabled so that I
can enable them on my box too and try to reproduce.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette