machdep.hlt_cpus not safe with ULE?

[Steven Hartland]

I'm trying to debug a possibly failing CPU, so I thought it would
be easy just disable the cores using machdep.hlt_cpus and see if
we see the panic's we've been seeing.

The problem is it seems ULE doesnt properly support machdep.hlt_cpus
and still schedules processes onto the halted cpus which obviously
causes problems.

Can anyone confirm this behaviour? Should machdep.hlt_cpus and I assume
the logical counterpart never be used with ULE?

    Regards
    Steve

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