Type: Bug
Resolution: Cannot Reproduce
Priority: Blocker
Component/s: pipeline
Labels:
None
Environment:
Docker image jenkins:2.426.3-lts-jdk11, jenkins:jdk17, jenkins:latest-jdk21 running on kubernetes or Docker.

Jenkins Console Output Issue with Input Step

Issue Description

Console output is not displaying in Jenkins web interface when using pipeline-as-code with input steps. This issue occurs specifically with Jenkins versions 2.426.3-lts-jdk11 and latest-jdk21, but works correctly in version 2.426.1-lts-jdk11.

Environment

Affected Jenkins versions:

jenkins:2.426.3-lts-jdk11

jenkins:latest-jdk21

Working Jenkins version:

jenkins:2.426.1-lts-jdk11

Pipeline Configuration

The issue manifests when the following input step is present in the pipeline:

def userInput = input(
    message: 'Please enter landing zone code',
    parameters: [string(
        defaultValue: 'lz000',
        description: 'The name of the assigned landing zone for this application',
        name: 'lzCode'
    )]
)

```
For all Jenkins steps and stages after this the Jenkins console is blank.
However the output is visible in raw text format.

Attempted Solutions

JAVA_OPTS Modification

Added memory settings:

JAVA_OPTS="-Xmx2048m -Xms512m"
Added GC logging:

JAVA_OPTS="-Xlog:gc*=debug:file=/var/jenkins_home/gc.log"

JENKINS_OPTS Modification

Modified logging settings:

JENKINS_OPTS="{}httpKeepAliveTimeout=60000{-} -handlerCountMax=100"
Adjusted console output buffer:

JENKINS_OPTS="--consoleOutputBufferSize=20MB"

Symptoms

Pipeline execution continues normally

Web interface shows no console output

Pipeline steps execute successfully

Input prompts appear but without surrounding console context

Issue only manifests when input step is present in pipeline code

Impact

Difficult to debug pipeline issues

No visibility into pipeline execution progress

Reduced ability to troubleshoot deployment problems

Affects operational efficiency and monitoring capabilities

Workaround

Currently, the only viable workaround is to use Jenkins version 2.426.1-lts-jdk11, which does not exhibit this issue.

Additional Notes

The issue appears to be related specifically to the interaction between the input step and console output handling

Problem persists across different browser types

Jenkins system logs show no relevant errors

Issue is reproducible in clean installations of affected versions

Request

Please investigate why console output fails specifically when input steps are present in pipeline code for versions after 2.426.1-lts-jdk11. This appears to be a regression in newer Jenkins versions.

The complete pipeline is below

pipeline {
  agent any
  options {
    disableConcurrentBuilds() 
    timeout(time: 1, unit: 'HOURS') 
    skipDefaultCheckout()
  }
  environment {
    BITBUCKET_COMMON_CREDS = credentials('BITBUCKET_COMMON_CREDS') REPOSITORY_CREDS = credentials('REPOSITORY_INFO') CURRENT_BRANCH = "main"
    PIPELINE_LOG_LEVEL = 'FINEST'
    LANDING_ZONE_CODE = 'lz000' // Default landing zone code 
  }
    stages {
      stage("Extracting landing zone environment variables") {
        steps {
          script {
            try {
              def userInput = input(
                message: 'Please enter landing zone code',
                parameters: [string(
                  defaultValue: 'lz000',
                  description: 'The name of the assigned landing zone for this application',
                  name: 'lzCode'
                )]
              )
              env.lzCode = userInput              def props = readProperties(file: "${env.lzCode}.conf")
              props.each {
                k,
                v -> env[k] = v
              }
            } catch (Exception e) {
              error "Failed to process landing zone configuration"
            }
          }
        }
      }
      stage("Getting Azure CSF Landing Zone Foundations") {
        steps {
          script {
            env.ORG_REPO_SPACE = REPOSITORY_CREDS_USR env.GIT_REPO = REPOSITORY_CREDS_PSW
          }
          cleanWs()
          withCredentials([usernamePassword(credentialsId: 'REPOSITORY_INFO',
            usernameVariable: 'REPO_SPACE',
            passwordVariable: 'REPO_NAME')]) {
            script {
              def gitUrl = "https://${BITBUCKET_COMMON_CREDS_USR}:${BITBUCKET_COMMON_CREDS_PSW}@github.com/${ORG_REPO_SPACE}/${GIT_REPO}.git"
              checkout([$class: 'GitSCM',
                branches: [
                  [name: "*/${CURRENT_BRANCH}"]
                ],
                userRemoteConfigs: [
                  [url: gitUrl]
                ]
              ])
            }
          }
        }
      }
      stage("Configuring Azure Access") {
        steps {
          script {
            sh 'chmod +x ./login.sh'
          }
        }
      }
      stage("Deploying Application Infrastructure") {
        steps {
          script {
            sh 'chmod +x ./test.sh'
          }
        }
      }
      stage("Deployment Validation Checks") {
        steps {
          script {
            sh 'chmod +x ./check-aks-cert-readiness.sh'
          }
        }
      }
      stage("Deployment Summary") {
        steps {
          script {
            sh 'echo "================== BEGIN VALIDATION ========="'
            sh 'pwd'
            sh 'ls -l'
            sh 'echo "================== DONE VALIDATING =========="'
          }
        }
      }
    }
    post {
      always {
        cleanWs()
      }
      failure {
        script {
          echo "Pipeline failed. Cleaning up..."
        }
      }
    }
  }

Details

Description