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Date:   Thu, 8 Sep 2022 22:28:41 +0300
From:   Mike Rapoport <rppt@linux.ibm.com>
To:     Dionna Amalie Glaze <dionnaglaze@google.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>,
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        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>,
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Subject: Re: [PATCHv7 02/14] mm: Add support for unaccepted memory
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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.