Program: 17510
Project: 17510
Buggy source:
public void init(){
  if (Session.getInstance().getClientConfig() == null) {
    ClientConfig.loadClientConfig(new DefaultCallback<ClientConfig>(context){
      @Override public void onModel(      ClientConfig model){
        Session.getInstance().setClientConfig(model);
        configDone=true;
        checkComplete();
      }
    }
);
  }
 else {
    configDone=true;
  }
  if (Session.getInstance().getUser() == null) {
    if (shouldSignIn()) {
      RequestToken.getRequestToken(new DefaultCallback<RequestToken>(context){
        @Override public void onModel(        RequestToken model){
          if (canceled)           return;
          Config config=Session.getInstance().getConfig();
          DefaultCallback<AccessTokenResult<User>> signinCallback=new DefaultCallback<AccessTokenResult<User>>(context){
            public void onModel(            AccessTokenResult<User> model){
              if (canceled)               return;
              Session.getInstance().setAccessToken(context,model.getAccessToken());
              Session.getInstance().setUser(model.getModel());
              userDone=true;
              checkComplete();
            }
          }
;
          if (config.getSsoToken() != null) {
            User.findOrCreate(config.getSsoToken(),signinCallback);
          }
 else {
            User.findOrCreate(config.getEmail(),config.getName(),config.getGuid(),signinCallback);
          }
        }
      }
);
    }
 else {
      AccessToken accessToken=BaseModel.load(context,"String_Node_Str",AccessToken.class);
      if (accessToken != null) {
        Session.getInstance().setAccessToken(accessToken);
        User.loadCurrentUser(new DefaultCallback<User>(context){
          @Override public void onModel(          User model){
            Session.getInstance().setUser(model);
            userDone=true;
            checkComplete();
          }
        }
);
      }
 else {
        userDone=true;
        checkComplete();
      }
    }
  }
 else {
    userDone=true;
  }
  checkComplete();
}

Fixed version (ground truth):
public void init(){
  if (Session.getInstance().getClientConfig() == null) {
    ClientConfig.loadClientConfig(new DefaultCallback<ClientConfig>(context){
      @Override public void onModel(      ClientConfig model){
        Session.getInstance().setClientConfig(model);
        configDone=true;
        checkComplete();
      }
    }
);
  }
 else {
    configDone=true;
  }
  if (Session.getInstance().getUser() == null) {
    if (shouldSignIn()) {
      RequestToken.getRequestToken(new DefaultCallback<RequestToken>(context){
        @Override public void onModel(        RequestToken model){
          if (canceled)           return;
          Session.getInstance().setRequestToken(model);
          Config config=Session.getInstance().getConfig();
          DefaultCallback<AccessTokenResult<User>> signinCallback=new DefaultCallback<AccessTokenResult<User>>(context){
            public void onModel(            AccessTokenResult<User> model){
              if (canceled)               return;
              Session.getInstance().setAccessToken(context,model.getAccessToken());
              Session.getInstance().setUser(model.getModel());
              userDone=true;
              checkComplete();
            }
          }
;
          if (config.getSsoToken() != null) {
            User.findOrCreate(config.getSsoToken(),signinCallback);
          }
 else {
            User.findOrCreate(config.getEmail(),config.getName(),config.getGuid(),signinCallback);
          }
        }
      }
);
    }
 else {
      AccessToken accessToken=BaseModel.load(context,"String_Node_Str",AccessToken.class);
      if (accessToken != null) {
        Session.getInstance().setAccessToken(accessToken);
        User.loadCurrentUser(new DefaultCallback<User>(context){
          @Override public void onModel(          User model){
            Session.getInstance().setUser(model);
            userDone=true;
            checkComplete();
          }
        }
);
      }
 else {
        userDone=true;
        checkComplete();
      }
    }
  }
 else {
    userDone=true;
  }
  checkComplete();
}