find command with -follow on /dev causing high cpu load and error messages

Issue

The following command results in a high CPU load (95%) as well as a heavy memory utilization.

find / -follow \( -fstype ext3 -o -fstype tmpfs \) -type f -name core -size +0 -ctime +7 -exec rm {} \;

The command produces following messages.

find: Symbolic link `/dev/.udev/failed/class@input@input2/event2/device/subsystem/drivers/i8042/i8042/serio0/bus/drivers/psmouse/serio1/input:event1/subsystem/input1/mouse0/subsystem' is part of a loop in the directory hierarchy; we have already visited the directory to which it points.