>> What I wasn't sure of what its behaviour was (does it just reboot?
>> halt?) ..
> The system will crash dump (if possible) and reboot automatically.

At least, that's what it's supposed to do.  I've seen machines hang
when trying to take a crashdump.  Discouragingly often, in fact.

On the other hand, dropping into ddb is no better if the machine is
unattended....

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