During system reboot, this message might appear and the boot seemingly hangs. After starting syslogd(1M) service, the system runs /etc/rc2.d/S75cron, which in turn calls ps(1). Sometimes after an abrupt system crash /dev/bd.off becomes a link to nowhere, causing the ps(1) command to hang indefinitely.
Reboot as a single user (for example with boot -s) and run ls -l /dev/bd* to see if this is the problem. If so, remove /dev/bd.off, then run bdconfig off or reboot with the -r (reconfigure) option.
This is the most commonly reported situation that causes ps(1) to hang.