minor bug in dump, can cause system to hang.

[Arthur David Olson]

> > But why fix dump when the problem is almost certainly in the disk driver?
>
> . . .If you read the man pages for the disk devices you will see
> that they strongly suggest that you do reads in multiples
> of 512 (== DEV_BSIZE) when reading the raw device. . .
> The bug is in dump, and should be fixed there.

If the claim is that dump "ought to" read in multiples of DEV_BSIZE,
then the driver is buggy in its failure to reject read requests of other sizes.
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