Re: unable to boot latest 14-stable

Hi Mark,

I think the zpool upgrade thing is a red herring, a symptom of the root cause.

On the 30th September the machine was upgraded from 13-stable of that date 
to 14-stable of that date. When it became 14-stable, zpool was upgraded.

In the days between then and 11th October, the machine was rebooted several times,
each time it came back up normally.

Around the 10-11th October, sources were updated and a new buildworld etc cycle
happened, installing a slightly later 14-stable version.

The boot failure would seem to indicate the msdos materials needed for booting
changed between the 30th Sept and 10-11th October. Either that or something
the materials invoke on the zfs side of things. The problem I'm having
is that I cannot find anything relevant for this on cgit in the timeframe and 
there's no mention of anything relevant to this in UPDATING, so I can't 
anticipate the problem happening again.
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