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From:   Dionna Amalie Glaze <dionnaglaze@google.com>
Date:   Thu, 8 Sep 2022 09:23:07 -0700
Message-ID: <CAAH4kHaP8JUh0Z4rF83=2RZTGMATT5MHot6rAnAwt79PL64mVQ@mail.gmail.com>
Subject: Re: [PATCHv7 02/14] mm: Add support for unaccepted memory
To:     Mike Rapoport <rppt@linux.ibm.com>
Cc:     Dave Hansen <dave.hansen@intel.com>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        Mel Gorman <mgorman@techsingularity.net>,
        Vlastimil Babka <vbabka@suse.cz>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Borislav Petkov <bp@alien8.de>,
        Andy Lutomirski <luto@kernel.org>,
        Sean Christopherson <seanjc@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Joerg Roedel <jroedel@suse.de>,
        Ard Biesheuvel <ardb@kernel.org>,
        Andi Kleen <ak@linux.intel.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@linux.intel.com>,
        David Rientjes <rientjes@google.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Ingo Molnar <mingo@redhat.com>,
        Dario Faggioli <dfaggioli@suse.com>,
        Mike Rapoport <rppt@kernel.org>,
        David Hildenbrand <david@redhat.com>,
        Marcelo Cerri <marcelo.cerri@canonical.com>,
        tim.gardner@canonical.com,
        Khalid ElMously <khalid.elmously@canonical.com>,
        philip.cox@canonical.com,
        "the arch/x86 maintainers" <x86@kernel.org>,
        Linux Memory Management List <linux-mm@kvack.org>,
        linux-coco@lists.linux.dev, linux-efi <linux-efi@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>
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>
> Looks like the first access to the memory map fails, although I think
> it's not in INIT_LIST_HEAD() but rather in init_page_count().
>
> I'd start with making sure that page_alloc::memmap_alloc() actually returns
> accepted memory. If you build kernel with CONFIG_DEBUG_VM=y the memory map
> will poisoned in this function, so my guess is it'd crash there.
>

That's a wonderful hint, thank you! I did not run this test
CONFIG_DEBUG_VM set, but you think it's possible it could still be
here?

> --
> Sincerely yours,
> Mike.


-- 
-Dionna Glaze, PhD (she/her)