BOO! :mrgreen:
Whaddya think, mold or fire? 
One rafter bay (end) and adjacent exterior wall were haunted. 
The white paint says “fire” to me.
or cover the “mold”
mold i have seen this before on a few other inspections, some remeadiators after cleaning the wood will spray on a paint to fight mold called " Killz" as a preventer of it coming back.
Rusty nails, roof deck board replacement (pic. 2), signs of roof leakage or high moisture content.
White can of spray paint. Pattern on the rafters give it away (picture 3). Covering up water stains or mold - I wager.
Now I agree… that’s a mold issue.