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Date:   Sun, 24 Oct 2021 08:37:59 +0300
From:   Mike Rapoport <>
To:     Matthew Wilcox <>
Cc:     Kees Cook <>,
        Dmitry Vyukov <>,
        syzbot <>,
        Jordy Zomer <>,,,,
Subject: Re: [syzbot] WARNING: refcount bug in sys_memfd_secret

On Sat, Oct 23, 2021 at 11:46:18PM +0100, Matthew Wilcox wrote:
> 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. 

Do you mean that creation of 4 billion of file descriptors is not feasible?

Sincerely yours,

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