parallel tee sh garbles output

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      When running the tee command on parallel stages the console output becomes garbled.  The stage name is displayed directly over other stage names, and output is mangled together.

      pipeline {
    agent any
    stages {
        stage('stage') {
            steps {
                script {
                    parallel ((1..20).collect{it}.collectEntries {stageNumber ->
                        ["$stageNumber": {
                            node('master') {
                                stage("$stageNumber") {
                                    tee('output.log') {
                                        sh("for i in 1 2 3 4 5; do sleep 1; echo $stageNumber \$i; done")
                                    }
                                }
                            }
                        }]
                    })
                }
            }
        }
    }
}

      Will produce console output such as:

      ...
+ for i in 1 23 3 4 5
+  4s l5e
e+p  3s
leep 3
++ e cehcoh o5  62 
25
 ​62 2+ ​+f ofro ri  ii ni n1  12  23  34  455
...

       

      However, this behaves nominally if the tee block does not call sh:

                                              [1, 2, 3, 4, 5].each {
                                            sleep 1
                                            echo "$stageNumber $it "
                                        }

       

            Assignee:
            rsandell
            Reporter:
            James Sassano
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              Created:
              Updated: