}

	var state stackScanState
	state.stack = gp.stack

	if stackTraceDebug {
		println("stack trace goroutine", gp.goid)
	}

	if debugScanConservative && gp.asyncSafePoint {
		print("scanning async preempted goroutine ", gp.goid, " stack [", hex(gp.stack.lo), ",", hex(gp.stack.hi), ")\n")
	}

	// Scan the saved context register. This is effectively a live
	// register that gets moved back and forth between the

		}

		systemstack(func() {
			// Mark our goroutine preemptible so its stack
			// can be scanned. This lets two mark workers
			// scan each other (otherwise, they would
			// deadlock). We must not modify anything on
			// the G stack. However, stack shrinking is
			// disabled for mark workers, so it is safe to
			// read from the G stack.
			//
			// N.B. The execution tracer is not aware of this status

		}
		setSlot(slotID, VarLoc{0, stackOffset})
		if state.loggingLevel > 1 {
			if v.Op == OpVarDef {
				state.logf("at %v: stack-only var %v now live\n", v, state.slots[slotID])
			} else {
				state.logf("at %v: stack-only var %v now dead\n", v, state.slots[slotID])
			}
		}

	case v.Op == OpArg:
		home := state.f.getHome(v.ID).(LocalSlot)

	n := tracebackPCs(&u, 0, pcbuf)
	r.Stack = make([]uintptr, n)
	copy(r.Stack, pcbuf)
}

// Stack formats a stack trace of the calling goroutine into buf
// and returns the number of bytes written to buf.
// If all is true, Stack formats stack traces of all other goroutines
// into buf after the trace for the current goroutine.
func Stack(buf []byte, all bool) int {
	var stw worldStop
	if all {

			}

			spdelta := int64(pcsp.Value)
			if !haslr {
				// Return address has been pushed onto stack.
				spdelta += int64(d.arch.PtrSize)
			}

			if haslr && !fi.TopFrame() {
				// TODO(bryanpkc): This is imprecise. In general, the instruction
				// that stores the return address to the stack frame is not the
				// same one that allocates the frame.
				if pcsp.Value > 0 {

	testName, ok, _ := t.context.match.fullName(&t.common, name)
	if !ok || shouldFailFast() {
		return true
	}
	// Record the stack trace at the point of this call so that if the subtest
	// function - which runs in a separate stack - is marked as a helper, we can
	// continue walking the stack into the parent test.
	var pc [maxStackLen]uintptr
	n := runtime.Callers(2, pc[:])
	t = &T{
		common: common{

	var stack []*loadPkg
	for p := pkg; p != nil; p = p.stack {
		stack = append(stack, p)
	}

	var buf strings.Builder
	for i := len(stack) - 1; i >= 0; i-- {
		p := stack[i]
		fmt.Fprint(&buf, p.path)
		if p.testOf != nil {
			fmt.Fprint(&buf, ".test")
		}
		if i > 0 {
			if stack[i-1].testOf == p {
				fmt.Fprint(&buf, " tested by\n\t")
			} else {
				fmt.Fprint(&buf, " imports\n\t")

	9:  "killed",
	10: "user defined signal 1",
	11: "segmentation fault",
	12: "user defined signal 2",
	13: "broken pipe",
	14: "alarm clock",
	15: "terminated",
	16: "stack fault",
	17: "child exited",
	18: "continued",
	19: "stopped (signal)",
	20: "stopped",
	21: "stopped (tty input)",
	22: "stopped (tty output)",
	23: "urgent I/O condition",

	9:  "killed",
	10: "user defined signal 1",
	11: "segmentation fault",
	12: "user defined signal 2",
	13: "broken pipe",
	14: "alarm clock",
	15: "terminated",
	16: "stack fault",
	17: "child exited",
	18: "continued",
	19: "stopped (signal)",
	20: "stopped",
	21: "stopped (tty input)",
	22: "stopped (tty output)",
	23: "urgent I/O condition",

		// ep's data pointer sometime before this point and it's possible
		// for that memory to get freed.
		KeepAlive(ep)
		return
	}

	// stack
	if gp := getg(); gp.m.curg.stack.lo <= uintptr(p) && uintptr(p) < gp.m.curg.stack.hi {
		found := false
		var u unwinder
		for u.initAt(gp.m.curg.sched.pc, gp.m.curg.sched.sp, 0, gp.m.curg, 0); u.valid(); u.next() {