Program: 110303
Project: 110303
Buggy source:
@Override public void render(long positionUs,long elapsedRealtimeUs) throws ExoPlaybackException {
  if (outputStreamEnded) {
    return;
  }
  if (nextSubtitle == null) {
    decoder.setPositionUs(positionUs);
    try {
      nextSubtitle=decoder.dequeueOutputBuffer();
    }
 catch (    SubtitleDecoderException e) {
      throw ExoPlaybackException.createForRenderer(e,getIndex());
    }
  }
  if (getState() != STATE_STARTED) {
    return;
  }
  boolean textRendererNeedsUpdate=false;
  if (subtitle != null) {
    long subtitleNextEventTimeUs=getNextEventTime();
    while (subtitleNextEventTimeUs <= positionUs) {
      nextSubtitleEventIndex++;
      subtitleNextEventTimeUs=getNextEventTime();
      textRendererNeedsUpdate=true;
    }
  }
  if (nextSubtitle != null) {
    if (nextSubtitle.isEndOfStream()) {
      if (!textRendererNeedsUpdate && getNextEventTime() == Long.MAX_VALUE) {
        if (subtitle != null) {
          subtitle.release();
          subtitle=null;
        }
        nextSubtitle.release();
        nextSubtitle=null;
        outputStreamEnded=true;
      }
    }
 else     if (nextSubtitle.timeUs <= positionUs) {
      if (subtitle != null) {
        subtitle.release();
      }
      subtitle=nextSubtitle;
      nextSubtitle=null;
      nextSubtitleEventIndex=subtitle.getNextEventTimeIndex(positionUs);
      textRendererNeedsUpdate=true;
    }
  }
  if (textRendererNeedsUpdate) {
    updateOutput(subtitle.getCues(positionUs));
  }
  try {
    while (!inputStreamEnded) {
      if (nextInputBuffer == null) {
        nextInputBuffer=decoder.dequeueInputBuffer();
        if (nextInputBuffer == null) {
          return;
        }
      }
      int result=readSource(formatHolder,nextInputBuffer);
      if (result == C.RESULT_BUFFER_READ) {
        nextInputBuffer.clearFlag(C.BUFFER_FLAG_DECODE_ONLY);
        if (nextInputBuffer.isEndOfStream()) {
          inputStreamEnded=true;
        }
 else {
          nextInputBuffer.subsampleOffsetUs=formatHolder.format.subsampleOffsetUs;
          nextInputBuffer.flip();
        }
        decoder.queueInputBuffer(nextInputBuffer);
        nextInputBuffer=null;
      }
 else       if (result == C.RESULT_NOTHING_READ) {
        break;
      }
    }
  }
 catch (  SubtitleDecoderException e) {
    throw ExoPlaybackException.createForRenderer(e,getIndex());
  }
}

Fixed version (ground truth):
@Override public void render(long positionUs,long elapsedRealtimeUs) throws ExoPlaybackException {
  if (outputStreamEnded) {
    return;
  }
  if (nextSubtitle == null) {
    decoder.setPositionUs(positionUs);
    try {
      nextSubtitle=decoder.dequeueOutputBuffer();
    }
 catch (    SubtitleDecoderException e) {
      throw ExoPlaybackException.createForRenderer(e,getIndex());
    }
  }
  if (getState() != STATE_STARTED) {
    return;
  }
  boolean textRendererNeedsUpdate=false;
  if (subtitle != null) {
    long subtitleNextEventTimeUs=getNextEventTime();
    while (subtitleNextEventTimeUs <= positionUs) {
      nextSubtitleEventIndex++;
      subtitleNextEventTimeUs=getNextEventTime();
      textRendererNeedsUpdate=true;
    }
  }
  if (nextSubtitle != null) {
    if (nextSubtitle.isEndOfStream()) {
      if (!textRendererNeedsUpdate && getNextEventTime() == Long.MAX_VALUE) {
        if (subtitle != null) {
          subtitle.release();
          subtitle=null;
        }
        nextSubtitle.release();
        nextSubtitle=null;
        outputStreamEnded=true;
      }
    }
 else     if (nextSubtitle.timeUs <= positionUs) {
      if (subtitle != null) {
        subtitle.release();
      }
      subtitle=nextSubtitle;
      nextSubtitle=null;
      nextSubtitleEventIndex=subtitle.getNextEventTimeIndex(positionUs);
      textRendererNeedsUpdate=true;
    }
  }
  if (textRendererNeedsUpdate) {
    updateOutput(subtitle.getCues(positionUs));
  }
  try {
    while (!inputStreamEnded) {
      if (nextInputBuffer == null) {
        nextInputBuffer=decoder.dequeueInputBuffer();
        if (nextInputBuffer == null) {
          return;
        }
      }
      int result=readSource(formatHolder,nextInputBuffer);
      if (result == C.RESULT_BUFFER_READ) {
        if (nextInputBuffer.isEndOfStream()) {
          inputStreamEnded=true;
        }
 else {
          nextInputBuffer.subsampleOffsetUs=formatHolder.format.subsampleOffsetUs;
          nextInputBuffer.flip();
        }
        decoder.queueInputBuffer(nextInputBuffer);
        nextInputBuffer=null;
      }
 else       if (result == C.RESULT_NOTHING_READ) {
        break;
      }
    }
  }
 catch (  SubtitleDecoderException e) {
    throw ExoPlaybackException.createForRenderer(e,getIndex());
  }
}