// Goroutine was created.
		gs.created(ev.Time(), ev.Thread(), ev.Stack())
	}
	if from == trace.GoSyscall {
		// Exiting syscall.
		gs.syscallEnd(ev.Time(), to != trace.GoRunning, ctx)
	}

	// Handle syscalls.
	if to == trace.GoSyscall {
		start := ev.Time()
		if from == trace.GoUndetermined {
			// Back-date the event to the start of the trace.
			start = ctx.startTime

		s = goStateTransition(e.ctx.G, GoRunning, GoSyscall)
		s.Stack = e.Stack() // This event references the resource the event happened on.
	case go122.EvGoSyscallEnd:
		s = goStateTransition(e.ctx.G, GoSyscall, GoRunning)
		s.Stack = e.Stack() // This event references the resource the event happened on.
	case go122.EvGoSyscallEndBlocked:
		s = goStateTransition(e.ctx.G, GoSyscall, GoRunnable)

		// We can fix this by acquiring the goroutine's scan bit.
		w = w.writeGoStatus(gp.goid, -1, traceGoWaiting, gp.inMarkAssist, 0)
	}
	return w
}

// GoSysCall emits a GoSyscallBegin event.
//
// Must be called with a valid P.
func (tl traceLocker) GoSysCall() {
	// Scribble down the M that the P is currently attached to.
	pp := tl.mp.p.ptr()
	pp.trace.mSyscallID = int64(tl.mp.procid)

}

func (v *Validator) getOrCreateThread(e *errAccumulator, ev trace.Event, m trace.ThreadID) *schedContext {
	lenient := func() bool {
		// Be lenient about GoUndetermined -> GoSyscall transitions if they
		// originate from an old trace. These transitions lack thread
		// information in trace formats older than 1.22.
		if !v.Go121 {
			return false
		}

	},
}

type GoStatus uint8

const (
	GoBad GoStatus = iota
	GoRunnable
	GoRunning
	GoSyscall
	GoWaiting
)

func (s GoStatus) String() string {
	switch s {
	case GoRunnable:
		return "Runnable"
	case GoRunning:
		return "Running"
	case GoSyscall:
		return "Syscall"
	case GoWaiting:
		return "Waiting"
	}
	return "Bad"
}

type ProcStatus uint8

	if !ok {
		return curCtx, false, fmt.Errorf("event %s for goroutine (%v) that doesn't exist", go122.EventString(ev.typ), curCtx.G)
	}
	if state.status != go122.GoSyscall {
		return curCtx, false, fmt.Errorf("%s event for goroutine that's not %v", go122.EventString(ev.typ), GoSyscall)
	}
	// This goroutine is exiting itself.
	delete(o.gStates, curCtx.G)
	newCtx := curCtx
	newCtx.G = NoGoroutine

				// Record sched latency time as we transition out of runnable.
				if g.lastRunnableTime != 0 {
					g.SchedWaitTime += ev.Time().Sub(g.lastRunnableTime)
					g.lastRunnableTime = 0
				}
			case GoSyscall:
				// Record syscall execution time and syscall block time as we transition out of syscall.
				if g.lastSyscallTime != 0 {
					if g.lastSyscallBlockTime != 0 {

	})
}

// computePprofSyscall returns a computePprofFunc that generates a syscall pprof-like
// profile (time spent in syscalls).
func computePprofSyscall() computePprofFunc {
	return makeComputePprofFunc(trace.GoSyscall, func(_ string) bool {
		return true
	})
}

// computePprofSched returns a computePprofFunc that generates a scheduler latency pprof-like profile

	// startRunning is the most recent event that caused a goroutine to
	// transition to GoRunning.
	startRunningTime trace.Time

	// startSyscall is the most recent event that caused a goroutine to
	// transition to GoSyscall.
	syscall struct {
		time   trace.Time
		stack  trace.Stack
		active bool
	}

	// startBlockReason is the StateTransition.Reason of the most recent
	// event that caused a goroutine to transition to GoWaiting.

	EvGoBlockSync:       {"GoBlockSync", 5, true, []string{}, nil},
	EvGoBlockCond:       {"GoBlockCond", 5, true, []string{}, nil},
	EvGoBlockNet:        {"GoBlockNet", 5, true, []string{}, nil},
	EvGoSysCall:         {"GoSysCall", 5, true, []string{}, nil},
	EvGoSysExit:         {"GoSysExit", 5, false, []string{"g", "seq", "ts"}, nil},
	EvGoSysBlock:        {"GoSysBlock", 5, false, []string{}, nil},