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    SubjectRe: [PATCH, RESEND] locks: fix possible infinite loop in posix deadlock detection
    On Tue, 30 Oct 2007 11:20:02 -0400
    "J. Bruce Fields" <bfields@fieldses.org> wrote:

    > From: J. Bruce Fields <bfields@citi.umich.edu>
    >
    > It's currently possible to send posix_locks_deadlock() into an infinite
    > loop (under the BKL).
    >
    > For now, fix this just by bailing out after a few iterations. We may
    > want to fix this in a way that better clarifies the semantics of
    > deadlock detection. But that will take more time, and this minimal fix
    > is probably adequate for any realistic scenario, and is simple enough to
    > be appropriate for applying to stable kernels now.
    >
    > Thanks to George Davis for reporting the problem.
    >
    > Cc: "George G. Davis" <gdavis@mvista.com>
    > Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

    Acked-by: Alan Cox <alan@redhat.com>

    Its a good fix for now and I doubt any real world user has that complex a
    locking pattern to break.
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