cufft: sharing work area between plans

I’m looking at using cufftSetWorkArea to reduce memory usage in an application, but I’m slightly worried about this statement in the docs:

That suggests to me that it’s indeterminate if two plans share the same work area, even if they are never executing at the same time. That seems counter-intuitive to me - is it really the case, or can I safely share a work area between plans if they are serialized?

i think they say about work areas of cufftExecute*() calls that MAY overlap. just remainder for nubs that think they can use one work area for everyting they do simultaneously