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Date:   Sat, 23 Oct 2021 23:46:18 +0100
From:   Matthew Wilcox <>
To:     Kees Cook <>
Cc:     Mike Rapoport <>,
        Dmitry Vyukov <>,
        syzbot <>,
        Jordy Zomer <>,,,,
Subject: Re: [syzbot] WARNING: refcount bug in sys_memfd_secret

On Sat, Oct 23, 2021 at 10:03:11AM -0700, Kees Cook wrote:
> On October 23, 2021 8:27:28 AM PDT, Mike Rapoport <> wrote:
> >and my first reaction was to send a revert the untested commit 110860541f44
> >("mm/secretmem: use refcount_t instead of atomic_t"). 

I think you should.  This isn't a real problem.  And it abuses the
refcount_t interface.  Your hack is clever, but it's fundamentally

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