HULC is a process responsible for link status detection. This task is performed after POST is done.
The LED process wakes up every 40ms to maintain the LED states. Inside this infinite loop, it will
perform the following tasks.
1. Gather Status Information.
2. Calculate Display Mode.
3. Calculate LED States.
4. Calculate the Color.
5. Write the settings to LED register.
As Naidu said, when there is physical link flapping, you will see this process going high as it now has to do more work in order to keep up the blinking LED status of ports. In case, your ports have been stable, look for the known caveat for the IOS version you are running. The most generic one has been mentioned by Naidu - CSCsi78581.
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