12532 unix: NULL pointer errors
Reviewed by: Gary Mills <gary_mills@fastmail.fm>
Approved by: Dan McDonald <danmcd@joyent.com>

5285 pass in cpu_pause_func via pause_cpus
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Approved by: Gordon Ross <gwr@nexenta.com>

6923763 break followed by sync results in panic dump timeout 'dump aborted'

4873353 panic: mp_cpu_quiesce: cpu_thread != cpu_idle_thread

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