A safety system stopped the Buzz Saw ride automatically but no-one was put in danger, Dreamworld said.
The passengers were trapped on the ride for about half an hour, according to local media.
Four people were killed at the park on Queensland's Gold Coast last year when the Thunder River Rapids ride malfunctioned.
The Buzz Saw ride is billed as "the highest inversion ride in the Southern Hemisphere" with a 46m (150ft) vertical ascent.