/buzz/
vi. 1. Of a program, to run with no indication of progress and perhaps without guarantee of ever finishing; esp. said of programs thought to be executing tight loops of code. A program that is buzzing appears to be catatonic, but you never get out of catatonia, while a buzzing loop may eventually end of its own accord.
"The program buzzes for about 10 seconds trying to sort all the names into order."
See spin; see also grovel.