linux-kernel - Re: [PATCHv7 02/14] mm: Add support for unaccepted memory

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Message-ID: <YxpCaQARczhZQmq2@linux.ibm.com>
Date:   Thu, 8 Sep 2022 22:28:41 +0300
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     Dionna Amalie Glaze <dionnaglaze@...gle.com>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Joerg Roedel <jroedel@...e.de>,
        Ard Biesheuvel <ardb@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Dario Faggioli <dfaggioli@...e.com>,
        Mike Rapoport <rppt@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Marcelo Cerri <marcelo.cerri@...onical.com>,
        tim.gardner@...onical.com,
        Khalid ElMously <khalid.elmously@...onical.com>,
        philip.cox@...onical.com,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        linux-coco@...ts.linux.dev, linux-efi <linux-efi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv7 02/14] mm: Add support for unaccepted memory

On Thu, Sep 08, 2022 at 09:23:07AM -0700, Dionna Amalie Glaze wrote:
> >
> > 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?

It depends on how you configured your kernel. Say, defconfig does not set
it.

-- 
Sincerely yours,
Mike.