bool RendererSchedulerImpl::MainThreadSeemsUnresponsive(
    base::TimeDelta main_thread_responsiveness_threshold) {
  base::TimeTicks now = tick_clock()->NowTicks();
  base::TimeDelta estimated_queueing_time;

  bool can_read = false;

  base::subtle::Atomic32 version;
  seqlock_queueing_time_estimator_.seqlock.TryRead(&can_read, &version);

  if (!can_read)
    return GetCompositorThreadOnly().main_thread_seems_unresponsive;

  QueueingTimeEstimator::State queueing_time_estimator_state =
      seqlock_queueing_time_estimator_.data.GetState();

  if (seqlock_queueing_time_estimator_.seqlock.ReadRetry(version))
    return GetCompositorThreadOnly().main_thread_seems_unresponsive;

  QueueingTimeEstimator queueing_time_estimator(queueing_time_estimator_state);

  estimated_queueing_time =
      queueing_time_estimator.EstimateQueueingTimeIncludingCurrentTask(now);

  bool main_thread_seems_unresponsive =
      estimated_queueing_time > main_thread_responsiveness_threshold;
  GetCompositorThreadOnly().main_thread_seems_unresponsive =
      main_thread_seems_unresponsive;

  return main_thread_seems_unresponsive;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.