overworked ??

What does the following indicate? (nothing to run, one task to upload)

8/2/2009 4:19:06 PM Einstein@Home chosen: CUDA idle instance
8/2/2009 4:19:06 PM [wfd] ------- start work fetch state -------
8/2/2009 4:19:06 PM [wfd] target work buffer: 0.86 + 432000.00 sec
8/2/2009 4:19:06 PM [wfd] CPU: shortfall 0.00 nidle 0.00 est. delay 686613.89 RS fetchable 50.00 runnable 500.00
8/2/2009 4:19:06 PM Einstein@Home [wfd] CPU: fetch share 1.00 debt -1055930.98 backoff dt 0.00 int 0.00 (overworked)