Program: 42389
Project: 42389
Buggy source:
public void run(){
  boolean synthAvailable=false;
  String utteranceId="String_Node_Str";
  Log.i(SERVICE_TAG,"String_Node_Str" + speechItem.mFilename);
  try {
    synthAvailable=synthesizerLock.tryLock();
    if (!synthAvailable) {
synchronized (this) {
        mSynthBusy=true;
      }
      Thread.sleep(100);
      Thread synth=(new Thread(new SynthThread()));
      synth.start();
synchronized (this) {
        mSynthBusy=false;
      }
      return;
    }
    String language="String_Node_Str";
    String country="String_Node_Str";
    String variant="String_Node_Str";
    String speechRate="String_Node_Str";
    String engine="String_Node_Str";
    if (speechItem.mParams != null) {
      for (int i=0; i < speechItem.mParams.size() - 1; i=i + 2) {
        String param=speechItem.mParams.get(i);
        if (param != null) {
          if (param.equals(TextToSpeech.Engine.KEY_PARAM_RATE)) {
            speechRate=speechItem.mParams.get(i + 1);
          }
 else           if (param.equals(TextToSpeech.Engine.KEY_PARAM_LANGUAGE)) {
            language=speechItem.mParams.get(i + 1);
          }
 else           if (param.equals(TextToSpeech.Engine.KEY_PARAM_COUNTRY)) {
            country=speechItem.mParams.get(i + 1);
          }
 else           if (param.equals(TextToSpeech.Engine.KEY_PARAM_VARIANT)) {
            variant=speechItem.mParams.get(i + 1);
          }
 else           if (param.equals(TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID)) {
            utteranceId=speechItem.mParams.get(i + 1);
          }
 else           if (param.equals(TextToSpeech.Engine.KEY_PARAM_ENGINE)) {
            engine=speechItem.mParams.get(i + 1);
          }
        }
      }
    }
    if (mKillList.get(speechItem) == null) {
      if (engine.length() > 0) {
        setEngine(engine);
      }
      if (language.length() > 0) {
        setLanguage("String_Node_Str",language,country,variant);
      }
      if (speechRate.length() > 0) {
        setSpeechRate("String_Node_Str",Integer.parseInt(speechRate));
      }
      try {
        sNativeSynth.synthesizeToFile(speechItem.mText,speechItem.mFilename);
      }
 catch (      NullPointerException e) {
        Log.v(SERVICE_TAG,"String_Node_Str");
      }
    }
  }
 catch (  InterruptedException e) {
    Log.e(SERVICE_TAG,"String_Node_Str");
    e.printStackTrace();
  }
 finally {
    if (utteranceId.length() > 0) {
      dispatchUtteranceCompletedCallback(utteranceId,speechItem.mCallingApp);
    }
    if (synthAvailable) {
      synthesizerLock.unlock();
      processSpeechQueue();
    }
  }
}

Fixed version (ground truth):
public void run(){
  boolean synthAvailable=false;
  String utteranceId="String_Node_Str";
  Log.i(SERVICE_TAG,"String_Node_Str" + speechItem.mFilename);
  try {
    synthAvailable=synthesizerLock.tryLock();
    if (!synthAvailable) {
synchronized (this) {
        mSynthBusy=true;
      }
      Thread.sleep(100);
      Thread synth=(new Thread(new SynthThread()));
      synth.start();
synchronized (this) {
        mSynthBusy=false;
      }
      return;
    }
    String language="String_Node_Str";
    String country="String_Node_Str";
    String variant="String_Node_Str";
    String speechRate="String_Node_Str";
    String engine="String_Node_Str";
    if (speechItem.mParams != null) {
      for (int i=0; i < speechItem.mParams.size() - 1; i=i + 2) {
        String param=speechItem.mParams.get(i);
        if (param != null) {
          if (param.equals(TextToSpeech.Engine.KEY_PARAM_RATE)) {
            speechRate=speechItem.mParams.get(i + 1);
          }
 else           if (param.equals(TextToSpeech.Engine.KEY_PARAM_LANGUAGE)) {
            language=speechItem.mParams.get(i + 1);
          }
 else           if (param.equals(TextToSpeech.Engine.KEY_PARAM_COUNTRY)) {
            country=speechItem.mParams.get(i + 1);
          }
 else           if (param.equals(TextToSpeech.Engine.KEY_PARAM_VARIANT)) {
            variant=speechItem.mParams.get(i + 1);
          }
 else           if (param.equals(TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID)) {
            utteranceId=speechItem.mParams.get(i + 1);
          }
 else           if (param.equals(TextToSpeech.Engine.KEY_PARAM_ENGINE)) {
            engine=speechItem.mParams.get(i + 1);
          }
        }
      }
    }
    if (mKillList.get(speechItem) == null) {
      if (engine.length() > 0) {
        setEngine(engine);
      }
 else {
        setEngine(getDefaultEngine());
      }
      if (language.length() > 0) {
        setLanguage("String_Node_Str",language,country,variant);
      }
 else {
        setLanguage("String_Node_Str",getDefaultLanguage(),getDefaultCountry(),getDefaultLocVariant());
      }
      if (speechRate.length() > 0) {
        setSpeechRate("String_Node_Str",Integer.parseInt(speechRate));
      }
 else {
        setSpeechRate("String_Node_Str",getDefaultRate());
      }
      try {
        sNativeSynth.synthesizeToFile(speechItem.mText,speechItem.mFilename);
      }
 catch (      NullPointerException e) {
        Log.v(SERVICE_TAG,"String_Node_Str");
      }
    }
  }
 catch (  InterruptedException e) {
    Log.e(SERVICE_TAG,"String_Node_Str");
    e.printStackTrace();
  }
 finally {
    if (utteranceId.length() > 0) {
      dispatchUtteranceCompletedCallback(utteranceId,speechItem.mCallingApp);
    }
    if (synthAvailable) {
      synthesizerLock.unlock();
      processSpeechQueue();
    }
  }
}