Keep track of the active buffer on output. For the moment, panic if

the device indicates that it wasn't able to write all the data in the
buffer out.

Ed Schouten doesn't like the idea of a panic here.  I think for
production code, we need something better.  For right now, while we're
trying to assess the impact of this issue, a panic is OK.  So complain
to me, not him if this is hit.

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