Program: 31994
Project: 31994
Buggy source:
/** 
 * Start the crypto module. Device keys will be uploaded, then one time keys if there are not enough on the homeserver and, then, if this is the first time, this new device will be announced to all other users devices.
 * @param aCallback the asynchronous callback
 */
public void start(final boolean isInitialSync,final ApiCallback<Void> aCallback){
  if ((null != aCallback) && (mInitializationCallbacks.indexOf(aCallback) < 0)) {
    mInitializationCallbacks.add(aCallback);
  }
  if (mIsStarting) {
    return;
  }
  if ((null != mNetworkConnectivityReceiver) && !mNetworkConnectivityReceiver.isConnected()) {
    mNetworkConnectivityReceiver.removeEventListener(mNetworkListener);
    mNetworkConnectivityReceiver.addEventListener(mNetworkListener);
    return;
  }
  mIsStarting=true;
  getEncryptingThreadHandler().post(new Runnable(){
    @Override public void run(){
      uploadDeviceKeys(new ApiCallback<KeysUploadResponse>(){
        private void onError(){
          getUIHandler().postDelayed(new Runnable(){
            @Override public void run(){
              if (!isStarted()) {
                mIsStarting=false;
                start(isInitialSync,null);
              }
            }
          }
,1000);
        }
        @Override public void onSuccess(        KeysUploadResponse info){
          getEncryptingThreadHandler().post(new Runnable(){
            @Override public void run(){
              if (!hasBeenReleased()) {
                Log.d(LOG_TAG,"String_Node_Str");
                Log.d(LOG_TAG,"String_Node_Str" + mSession.getMyUserId());
                Log.d(LOG_TAG,"String_Node_Str" + mSession.getCredentials().deviceId);
                Log.d(LOG_TAG,"String_Node_Str" + mOlmDevice.getDeviceEd25519Key());
                Log.d(LOG_TAG,"String_Node_Str" + mOlmDevice.getDeviceCurve25519Key());
                Log.d(LOG_TAG,"String_Node_Str" + mLastPublishedOneTimeKeys);
                Log.d(LOG_TAG,"String_Node_Str");
                getEncryptingThreadHandler().post(new Runnable(){
                  @Override public void run(){
                    maybeUploadOneTimeKeys(new ApiCallback<Void>(){
                      @Override public void onSuccess(                      Void info){
                        getEncryptingThreadHandler().post(new Runnable(){
                          @Override public void run(){
                            checkDeviceAnnounced(new ApiCallback<Void>(){
                              @Override public void onSuccess(                              Void info){
                                if (null != mNetworkConnectivityReceiver) {
                                  mNetworkConnectivityReceiver.removeEventListener(mNetworkListener);
                                }
                                mIsStarting=false;
                                mIsStarted=true;
                                for (                                ApiCallback<Void> callback : mInitializationCallbacks) {
                                  final ApiCallback<Void> fCallback=callback;
                                  getUIHandler().post(new Runnable(){
                                    @Override public void run(){
                                      fCallback.onSuccess(null);
                                    }
                                  }
);
                                }
                                mInitializationCallbacks.clear();
                                if (isInitialSync) {
                                  getEncryptingThreadHandler().post(new Runnable(){
                                    @Override public void run(){
                                      getDeviceList().invalidateAllDeviceLists();
                                      mDevicesList.refreshOutdatedDeviceLists();
                                    }
                                  }
);
                                }
                              }
                              @Override public void onNetworkError(                              Exception e){
                                Log.e(LOG_TAG,"String_Node_Str" + e.getMessage());
                                onError();
                              }
                              @Override public void onMatrixError(                              MatrixError e){
                                Log.e(LOG_TAG,"String_Node_Str" + e.getMessage());
                                onError();
                              }
                              @Override public void onUnexpectedError(                              Exception e){
                                Log.e(LOG_TAG,"String_Node_Str" + e.getMessage());
                                onError();
                              }
                            }
);
                          }
                        }
);
                      }
                      @Override public void onNetworkError(                      Exception e){
                        Log.e(LOG_TAG,"String_Node_Str" + e.getMessage());
                        onError();
                      }
                      @Override public void onMatrixError(                      MatrixError e){
                        Log.e(LOG_TAG,"String_Node_Str" + e.getMessage());
                        onError();
                      }
                      @Override public void onUnexpectedError(                      Exception e){
                        Log.e(LOG_TAG,"String_Node_Str" + e.getMessage());
                        onError();
                      }
                    }
);
                  }
                }
);
              }
            }
          }
);
        }
        @Override public void onNetworkError(        Exception e){
          Log.e(LOG_TAG,"String_Node_Str" + e.getMessage());
          onError();
        }
        @Override public void onMatrixError(        MatrixError e){
          Log.e(LOG_TAG,"String_Node_Str" + e.getMessage());
          onError();
        }
        @Override public void onUnexpectedError(        Exception e){
          Log.e(LOG_TAG,"String_Node_Str" + e.getMessage());
          onError();
        }
      }
);
    }
  }
);
}

Fixed version (ground truth):
/** 
 * Start the crypto module. Device keys will be uploaded, then one time keys if there are not enough on the homeserver and, then, if this is the first time, this new device will be announced to all other users devices.
 * @param aCallback the asynchronous callback
 */
public void start(final boolean isInitialSync,final ApiCallback<Void> aCallback){
synchronized (mInitializationCallbacks) {
    if ((null != aCallback) && (mInitializationCallbacks.indexOf(aCallback) < 0)) {
      mInitializationCallbacks.add(aCallback);
    }
  }
  if (mIsStarting) {
    return;
  }
  if ((null != mNetworkConnectivityReceiver) && !mNetworkConnectivityReceiver.isConnected()) {
    mNetworkConnectivityReceiver.removeEventListener(mNetworkListener);
    mNetworkConnectivityReceiver.addEventListener(mNetworkListener);
    return;
  }
  mIsStarting=true;
  getEncryptingThreadHandler().post(new Runnable(){
    @Override public void run(){
      uploadDeviceKeys(new ApiCallback<KeysUploadResponse>(){
        private void onError(){
          getUIHandler().postDelayed(new Runnable(){
            @Override public void run(){
              if (!isStarted()) {
                mIsStarting=false;
                start(isInitialSync,null);
              }
            }
          }
,1000);
        }
        @Override public void onSuccess(        KeysUploadResponse info){
          getEncryptingThreadHandler().post(new Runnable(){
            @Override public void run(){
              if (!hasBeenReleased()) {
                Log.d(LOG_TAG,"String_Node_Str");
                Log.d(LOG_TAG,"String_Node_Str" + mSession.getMyUserId());
                Log.d(LOG_TAG,"String_Node_Str" + mSession.getCredentials().deviceId);
                Log.d(LOG_TAG,"String_Node_Str" + mOlmDevice.getDeviceEd25519Key());
                Log.d(LOG_TAG,"String_Node_Str" + mOlmDevice.getDeviceCurve25519Key());
                Log.d(LOG_TAG,"String_Node_Str" + mLastPublishedOneTimeKeys);
                Log.d(LOG_TAG,"String_Node_Str");
                getEncryptingThreadHandler().post(new Runnable(){
                  @Override public void run(){
                    maybeUploadOneTimeKeys(new ApiCallback<Void>(){
                      @Override public void onSuccess(                      Void info){
                        getEncryptingThreadHandler().post(new Runnable(){
                          @Override public void run(){
                            checkDeviceAnnounced(new ApiCallback<Void>(){
                              @Override public void onSuccess(                              Void info){
                                if (null != mNetworkConnectivityReceiver) {
                                  mNetworkConnectivityReceiver.removeEventListener(mNetworkListener);
                                }
                                mIsStarting=false;
                                mIsStarted=true;
synchronized (mInitializationCallbacks) {
                                  for (                                  ApiCallback<Void> callback : mInitializationCallbacks) {
                                    final ApiCallback<Void> fCallback=callback;
                                    getUIHandler().post(new Runnable(){
                                      @Override public void run(){
                                        fCallback.onSuccess(null);
                                      }
                                    }
);
                                  }
                                  mInitializationCallbacks.clear();
                                }
                                if (isInitialSync) {
                                  getEncryptingThreadHandler().post(new Runnable(){
                                    @Override public void run(){
                                      getDeviceList().invalidateAllDeviceLists();
                                      mDevicesList.refreshOutdatedDeviceLists();
                                    }
                                  }
);
                                }
                              }
                              @Override public void onNetworkError(                              Exception e){
                                Log.e(LOG_TAG,"String_Node_Str" + e.getMessage());
                                onError();
                              }
                              @Override public void onMatrixError(                              MatrixError e){
                                Log.e(LOG_TAG,"String_Node_Str" + e.getMessage());
                                onError();
                              }
                              @Override public void onUnexpectedError(                              Exception e){
                                Log.e(LOG_TAG,"String_Node_Str" + e.getMessage());
                                onError();
                              }
                            }
);
                          }
                        }
);
                      }
                      @Override public void onNetworkError(                      Exception e){
                        Log.e(LOG_TAG,"String_Node_Str" + e.getMessage());
                        onError();
                      }
                      @Override public void onMatrixError(                      MatrixError e){
                        Log.e(LOG_TAG,"String_Node_Str" + e.getMessage());
                        onError();
                      }
                      @Override public void onUnexpectedError(                      Exception e){
                        Log.e(LOG_TAG,"String_Node_Str" + e.getMessage());
                        onError();
                      }
                    }
);
                  }
                }
);
              }
            }
          }
);
        }
        @Override public void onNetworkError(        Exception e){
          Log.e(LOG_TAG,"String_Node_Str" + e.getMessage());
          onError();
        }
        @Override public void onMatrixError(        MatrixError e){
          Log.e(LOG_TAG,"String_Node_Str" + e.getMessage());
          onError();
        }
        @Override public void onUnexpectedError(        Exception e){
          Log.e(LOG_TAG,"String_Node_Str" + e.getMessage());
          onError();
        }
      }
);
    }
  }
);
}