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From: David Howells <dhowells@redhat.com>
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To: Alan Jenkins <alan.christopher.jenkins@gmail.com>
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Subject: Re: [PATCH 03/34] teach move_mount(2) to work with OPEN_TREE_CLONE [ver #12]
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Date: Fri, 19 Oct 2018 22:40:06 +0100
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Alan Jenkins <alan.christopher.jenkins@gmail.com> wrote:

> I guess this tries to fix the second of the two sequences I mentioned - 
> mount+unmount, then close the FD.  It doesn't seem to work.

It fixes this:

    unshare --mount
    /root/test-fsmount
    mount --move . /mnt
    mount --move /mnt /mnt
    cd
    umount /mnt
    exit

Which usually gets a GPF in fsnotify.

David