[Bug 1062] mmv pmda sensitive to malevolent data

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Comment # 1 on bug 1062 from Frank Ch. Eigler

(A weaker variant of this problem involves the inherent risks of
lack of concurrency control between an application that asynchronously
modifies the mmv shmem data, at the same time as the pmda mmv can
read it.  Even four-byte metric values can get corrupted if an app
happens to write them byte-by-byte in an unexpected way, never mind
strings.)

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