// destroyed respectively. The m then might get reused with a different procid but
	// still with a reference to oldp, and still with the same syscalltick. The next
	// time a G is "created" in needm, it'll return and quietly reacquire its P from a
	// different m with a different procid, which will confuse the trace parser. By
	// trashing syscalltick, we ensure that it'll appear as if we lost the P to the