Bug ID 6604253: If you run the Solaris 10 11/06 OS and you harden drivers on the primary domain that is configured with only one strand, rebooting the primary domain or restarting the fault manager daemon (fmd) can result in an fmd core dump. The fmd dumps core while it cleans up its resources, and this does not affect the FMA diagnosis.
Workaround: Add a few more strands into the primary domain. For example,
# ldm add-vcpu 3 primary