So this is why one is not supposed to use regular dish soap in the dishwasher:
I wasn't washing dishes, just cleaning the machine - light, quick periodic wash as recommended. I thought using the 'extra strength' cleaner would be a good idea.
It was not.
Had to repeatedly cancel and restart the cycle until the suds subsided enough for it to complete the whole thing and rinse out.
This is me and at least the dishwasher is squeaky clean!