http://defect.opensolaris.org/bz/show_bug.cgi?id=4343





--- Comment #1 from Aubrey.Li <aubrey.li at intel.com>  2008-10-30 07:54:23 ---
more details on my side:

before pg_cmt_hier_sort(), the hierarchy was as follows:

PGHW_CACHE              @ level = 0  <=== no child
PGHW_CHIP               @ level = 1
PGHW_POW_ACTIVE         @ level = 2
PGHW_POW_IDLE           @ level = 3  <=== no parent

And after pg_cmt_hier_sort(), the hierarchy became:

PGHW_POW_IDLE           @ level = 0
PGHW_CACHE              @ level = 1
PGHW_CHIP               @ level = 2
PGHW_POW_ACTIVE         @ level = 3

so when passing pg to cmt_hier_promote(), kernel panic due to the cache group's
cmt_children pointer causing a NULL pointer dereference

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