[JENKINS-55861] Parallel stage labels displayed on top of each other

I noticed today that some of our build logs have written the stage label on top of each other when there was a parallel build step used. It doesn't look like it happens all the time, but does seem to happen when both stages write out at the same time.

The Jenkinsfile is essentially

pipeline

{

    agent any


    stages

    {

stage ('Parallel')

{

    steps

    {

parallel(

    first:  

    {

sh "run_first_test_that_outputs" // In our case PHPUnit       

    }

    second:

    {

sh "run_second_test_that_outputs" // In our case, session based tests 

    }

)

    }

}

    }

}

---
Originally reported by drugcrazed, imported from: Parallel stage labels displayed on top of each other

• status: Open
  
• priority: Trivial
  
• component(s): workflow-basic-steps-plugin
  
• resolution: Unresolved
  
• votes: 0
  
• watchers: 1
  
• imported: 20251215-220547
  

Raw content of original issue

I noticed today that some of our build logs have written the stage label on top of each other when there was a parallel build step used. It doesn't look like it happens all the time, but does seem to happen when both stages write out at the same time.


The Jenkinsfile is essentially




pipeline

{

    agent any


    stages

    {

        stage ('Parallel')

        {

            steps

            {

                parallel(

                    first:  

                    {

                        sh "run_first_test_that_outputs" // In our case PHPUnit                                               

                    }

                    second:

                    {

                        sh "run_second_test_that_outputs" // In our case, session based tests                                 

                    }

                )

            }

        }

    }

}

1 attachment

- [jenkins-parallel.png](https://issues.jenkins.io/secure/attachment/45837/jenkins-parallel.png)
> 

issue に示されている Jenkinsfile を使い、同時に出力を生成する 2 つの並列ステップで問題を再現します。まず、workflow-basic-steps-plugin が並列ステージとラベルをどのように処理しているかを調べます。並列出力が同時に発生しても、ステージラベルが互いに重なって表示されなくなれば完了です。

索引モデルが issue の本文から書いたものです。