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Request 8 DMA handles, some are null!

I have a XDAIS engine requesting 8 DMA handles.  I have printed out the DMA handles:

DMA channel 0 = 0x567770

DMA channel 1 = 0x567b30

DMA channel 2 = (nil)

DMA channel 3 = 0x562398

DMA channel 4 = (nil)

DMA channel 5 = (nil)

DMA channel 6 = (nil)

DMA channel 7 = (nil)

from DMA init.

Why would I get empty handles?