Hard lockups at boot [/dev/random]

This affects only HTT-enabled P4 machines.  Recent -CURRENT
builds (~from about 1--2 weeks ago) lock up at boot time,
inside /etc/rc.d/initrandom at this point:

     57                 ( ps -fauxww; sysctl -a; date; df -ib; dmesg;
ps -fauxww; ) \
     58                     | dd of=/dev/random bs=8k 2>/dev/null

This is a hard lockup and requires a reset.  The subsequent
boot tends to complete without a lockup, and then the behaviour
of the box is normal.

Has anyone else seen this behaviour?

-- 
FreeBSD Volunteer, http://people.freebsd.org/~jkoshy