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Post a schematic; there are too many ways to misinterpret your question's description without one.

this was fixed a long time ago. https://github.com/robertinant/EnergiaNG/issues/10 are you sure you have the latest stuff?

My gut instinct would be to add an additional condition (a timer) to that while loop. I don't work with that processor so I am not sure of the implementation but here's my pseudo code: while ( (pcb != NULL) && (thisTimer <= ARBITRARY_MAX_WAIT_TIME) ) { ... } I don't know if that makes any sense to do it that way, but that is how I am thinking. Add in a second variable that *you* have control over. Then you can have a measure of sanity of something goes off the rails. YMMV

googling seems to indicate this is a known problem.