// wait for someone to wake us up
	gp.param = nil
	// Signal to anyone trying to shrink our stack that we're about
	// to park on a channel. The window between when this G's status
	// changes and when we set gp.activeStackChans is not safe for
	// stack shrinking.
	gp.parkingOnChan.Store(true)
	gopark(selparkcommit, nil, waitReasonSelect, traceBlockSelect, 1)
	gp.activeStackChans = false

	sellock(scases, lockorder)

	gp.param = nil
	c.sendq.enqueue(mysg)
	// Signal to anyone trying to shrink our stack that we're about
	// to park on a channel. The window between when this G's status
	// changes and when we set gp.activeStackChans is not safe for
	// stack shrinking.
	gp.parkingOnChan.Store(true)
	gopark(chanparkcommit, unsafe.Pointer(&c.lock), waitReasonChanSend, traceBlockChanSend, 2)
	// Ensure the value being sent is kept alive until the

the P to be reused to run another G. This is still less efficient than
blocking the G directly since it consumes an M.

To interact directly with the goroutine scheduler, use `gopark` and
`goready`. `gopark` parks the current goroutine—putting it in the
"waiting" state and removing it from the scheduler's run queue—and
schedules another goroutine on the current M/P. `goready` puts a

}

// GoPark emits a GoBlock event with the provided reason.
//
// TODO(mknyszek): Replace traceBlockReason with waitReason. It's silly
// that we have both, and waitReason is way more descriptive.
func (tl traceLocker) GoPark(reason traceBlockReason, skip int) {

	# int(pc) will not work.
	try:
		# python3 / newer versions of gdb
		pc = int(pc)
	except gdb.error:
		# str(pc) can return things like
		# "0x429d6c <runtime.gopark+284>", so
		# chop at first space.
		pc = int(str(pc).split(None, 1)[0], 16)
	return pc


#
#  For reference, this is what we're trying to do:

		framecap uintptr
		argRegs  int
	)

	gp := getg()
	lock(&finlock)
	fing = gp
	unlock(&finlock)

	for {
		lock(&finlock)
		fb := finq
		finq = nil
		if fb == nil {
			gopark(finalizercommit, unsafe.Pointer(&finlock), waitReasonFinalizerWait, traceBlockSystemGoroutine, 1)
			continue
		}
		argRegs = intArgRegs
		unlock(&finlock)
		if raceenabled {
			racefingo()
		}

// pollDesc contains 2 binary semaphores, rg and wg, to park reader and writer
// goroutines respectively. The semaphore can be in the following states:
//
//	pdReady - io readiness notification is pending;
//	          a goroutine consumes the notification by changing the state to pdNil.
//	pdWait - a goroutine prepares to park on the semaphore, but not yet parked;
//	         the goroutine commits to park by changing the state to G pointer,

//
// goarm should be an internal detail,
// but widely used packages access it using linkname.
// Notable members of the hall of shame include:
//   - github.com/creativeprojects/go-selfupdate
//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//
//go:linkname goarm
var (
	goarm       uint8
	goarmsoftfp uint8
)

// returned data before calling ReadTrace again.
// ReadTrace must be called from one goroutine at a time.
func ReadTrace() []byte {
top:
	var buf []byte
	var park bool
	systemstack(func() {
		buf, park = readTrace0()
	})
	if park {
		gopark(func(gp *g, _ unsafe.Pointer) bool {
			if !trace.reader.CompareAndSwapNoWB(nil, gp) {
				// We're racing with another reader.
				// Wake up and handle this case.

	// safe-point because we don't have precise pointer maps for
	// all frames.
	if gp.asyncSafePoint {
		return false
	}
	// We also can't *shrink* the stack in the window between the
	// goroutine calling gopark to park on a channel and
	// gp.activeStackChans being set.
	if gp.parkingOnChan.Load() {
		return false
	}
	// We also can't copy the stack while tracing is enabled, and