Casino race condition

This looks like an expensive race condition at a casino.

“On May 3, 2007, Domino, of Galloway Township, N.J., bet $2.25 on a Harrah’s progressive slot machine that flashed she was the winner of $86,000. Casino officials, however, told her she actually won only $20,000 because another gambler had won the $86,000 jackpot three minutes earlier while playing another machine linked to the same system of progressive slot machines. When a jackpot is won, the meter is supposed to reset to the minimum prize of $20,000, said Harrah’s officials.”