"Panic: watchdog" error message

I got a message from operations techs regarding an error message on their zero client screen. It read: Panic: watchdog" then gave a time/date stamp, and at the bottom it read: "Setup free page map completed" "Coredump: total RAM 1662MB, compressed to 22MB in 8 seconds." "(Press and hold power button to restart)"

Can someone tell me what generates this message and what I need to do to correct it?

Thanks for your help!