// to make sure we don't write into the same buffer.
	if traceEnabled() || traceShuttingDown() {
		// Acquire sched.lock across thread destruction. One of the invariants of the tracer
		// is that a thread cannot disappear from the tracer's view (allm or freem) without
		// it noticing, so it requires that sched.lock be held over traceThreadDestroy.
		//
		// This isn't strictly necessary in this case, because this thread never leaves allm,