Program: 91693
Project: 91693
Buggy source:
private IProject create(MavenProjectInfo projectInfo,ProjectImportConfiguration configuration,IProgressMonitor monitor) throws CoreException {
  IWorkspace workspace=ResourcesPlugin.getWorkspace();
  IWorkspaceRoot root=workspace.getRoot();
  File pomFile=projectInfo.getPomFile();
  Model model=projectInfo.getModel();
  if (model == null) {
    model=maven.readModel(pomFile);
    projectInfo.setModel(model);
  }
  String projectName=configuration.getProjectName(model);
  File projectDir=pomFile.getParentFile();
  String projectParent=projectDir.getParentFile().getAbsolutePath();
  if (projectInfo.getBasedirRename() == MavenProjectInfo.RENAME_REQUIRED) {
    File newProject=new File(projectDir.getParent(),projectName);
    if (!projectDir.equals(newProject)) {
      boolean renamed=projectDir.renameTo(newProject);
      if (!renamed) {
        StringBuilder msg=new StringBuilder();
        msg.append(NLS.bind(Messages.ProjectConfigurationManager_error_rename,projectDir.getAbsolutePath())).append('.');
        if (newProject.exists()) {
          msg.append(NLS.bind(Messages.ProjectConfigurationManager_error_targetDir,newProject.getAbsolutePath()));
        }
        throw new CoreException(new Status(IStatus.ERROR,IMavenConstants.PLUGIN_ID,-1,msg.toString(),null));
      }
      projectInfo.setPomFile(getCanonicalPomFile(newProject));
      projectDir=newProject;
    }
  }
 else {
    if (projectParent.equals(root.getLocation().toFile().getAbsolutePath())) {
      projectName=projectDir.getName();
    }
  }
  monitor.subTask(NLS.bind(Messages.ProjectConfigurationManager_task_importing2,projectName));
  IProject project=root.getProject(projectName);
  if (project.exists()) {
    log.error("String_Node_Str" + projectName + "String_Node_Str");
    return null;
  }
  if (projectDir.equals(root.getLocation().toFile())) {
    log.error("String_Node_Str" + projectName + "String_Node_Str");
    return null;
  }
  if (projectParent.equals(root.getLocation().toFile().getAbsolutePath())) {
    project.create(monitor);
  }
 else {
    IProjectDescription description=workspace.newProjectDescription(projectName);
    description.setLocation(new Path(projectDir.getAbsolutePath()));
    project.create(description,monitor);
  }
  if (!project.isOpen()) {
    project.open(monitor);
  }
  ResolverConfiguration resolverConfiguration=configuration.getResolverConfiguration();
  enableBasicMavenNature(project,resolverConfiguration,monitor);
  return project;
}

Fixed version (ground truth):
private IProject create(MavenProjectInfo projectInfo,ProjectImportConfiguration configuration,IProgressMonitor monitor) throws CoreException {
  IWorkspace workspace=ResourcesPlugin.getWorkspace();
  IWorkspaceRoot root=workspace.getRoot();
  File pomFile=projectInfo.getPomFile();
  Model model=projectInfo.getModel();
  if (model == null) {
    model=maven.readModel(pomFile);
    projectInfo.setModel(model);
  }
  String projectName=configuration.getProjectName(model);
  File projectDir=pomFile.getParentFile();
  String projectParent=projectDir.getParentFile().getAbsolutePath();
  if (projectInfo.getBasedirRename() == MavenProjectInfo.RENAME_REQUIRED) {
    File newProject=new File(projectDir.getParent(),projectName);
    if (!projectDir.equals(newProject)) {
      boolean renamed=projectDir.renameTo(newProject);
      if (!renamed) {
        StringBuilder msg=new StringBuilder();
        msg.append(NLS.bind(Messages.ProjectConfigurationManager_error_rename,projectDir.getAbsolutePath())).append('.');
        if (newProject.exists()) {
          msg.append(NLS.bind(Messages.ProjectConfigurationManager_error_targetDir,newProject.getAbsolutePath()));
        }
        throw new CoreException(new Status(IStatus.ERROR,IMavenConstants.PLUGIN_ID,-1,msg.toString(),null));
      }
      projectInfo.setPomFile(getCanonicalPomFile(newProject));
      projectDir=newProject;
    }
  }
 else {
    if (projectParent.equals(root.getLocation().toFile().getAbsolutePath())) {
      projectName=projectDir.getName();
    }
  }
  monitor.subTask(NLS.bind(Messages.ProjectConfigurationManager_task_importing2,projectName));
  IProject project=root.getProject(projectName);
  if (project.exists()) {
    log.error("String_Node_Str" + projectName + "String_Node_Str");
    return null;
  }
  if (projectDir.equals(root.getLocation().toFile())) {
    log.error("String_Node_Str" + projectName + "String_Node_Str");
    return null;
  }
  if (projectParent.equals(root.getLocation().toFile().getAbsolutePath())) {
    project.create(monitor);
  }
 else {
    IProjectDescription description=workspace.newProjectDescription(projectName);
    description.setLocation(new Path(projectDir.getAbsolutePath()));
    project.create(description,monitor);
  }
  if (!project.isOpen()) {
    project.open(monitor);
  }
  ResolverConfiguration resolverConfiguration=configuration.getResolverConfiguration();
  enableBasicMavenNature(project,resolverConfiguration,monitor);
  LifecycleMappingConfiguration.persistEmpty(project);
  return project;
}