dumpgstatus(gp)
		throw("bad g status")
	}

	if gp.asyncSafePoint {
		// Double-check that async preemption does not
		// happen in SPWRITE assembly functions.
		// isAsyncSafePoint must exclude this case.
		f := findfunc(gp.sched.pc)
		if !f.valid() {
			throw("preempt at unknown pc")
		}
		if f.flag&abi.FuncFlagSPWrite != 0 {