Jenkins randomly stops and resumes

Summary

In random cases the build suddenly pauses and resumes after a while which causes unpredictable timeouts.

Steps to reproduce

Run GlassFish job, ie. here: https://ci.eclipse.org/glassfish/job/glassfish_build-and-test-using-jenkinsfile/job/PR-25517/

Today most of runs failed in random steps:

• ant -version paused for more than 10 minutes. At this moment it is still stuck: https://ci.eclipse.org/glassfish/job/glassfish_build-and-test-using-jenkinsfile/job/PR-25517/48/execution/node/431/log/

• java -version took 39 seconds in the same build:

  09:44:19  + java -version
  09:44:58  openjdk version "17.0.15" 2025-04-15
  09:44:58  OpenJDK Runtime Environment Temurin-17.0.15+6 (build 17.0.15+6)
  09:44:58  OpenJDK 64-Bit Server VM Temurin-17.0.15+6 (build 17.0.15+6, mixed mode, sharing)
  09:44:58  + ant -version

• in another job domain creations stuck; I tried to pause+resume the build, Jenkins reacted, but it still doesn't move for more than 2 minutes.

  09:57:20  + /home/jenkins/agent/workspace/_test-using-jenkinsfile_PR-25517/glassfish7/glassfish/bin/asadmin --user anonymous --passwordfile /home/jenkins/agent/workspace/_test-using-jenkinsfile_PR-25517/appserver/tests/appserv-tests/temppwd create-domain --adminport 45707 --domainproperties jms.port=45708:domain.jmxPort=45709:orb.listener.port=45710:http.ssl.port=45711:orb.ssl.port=45714:orb.mutualauth.port=45715 --instanceport 45712 domain1
  Pausing
  Resuming

• another step paused when starting maven:

  09:38:48  + mvn clean package -f /home/jenkins/agent/workspace/_test-using-jenkinsfile_PR-25517/appserver/tests/appserv-tests/lib/pom.xml -Pstaging
  09:43:43  [INFO] Scanning for projects...

• And again another nearly 3 minute pause

  09:57:20  + /home/jenkins/agent/workspace/_test-using-jenkinsfile_PR-25517/glassfish7/glassfish/bin/asadmin --user anonymous --passwordfile /home/jenkins/agent/workspace/_test-using-jenkinsfile_PR-25517/appserver/tests/appserv-tests/temppwd create-domain --adminport 45707 --domainproperties jms.port=45708:domain.jmxPort=45709:orb.listener.port=45710:http.ssl.port=45711:orb.ssl.port=45714:orb.mutualauth.port=45715 --instanceport 45712 domain1
  10:00:28  Using port 45707 for Admin.

What is the expected correct behavior?

Build should pass or fail in around 30 minutes and run without pausing and especially timeouts.

Priority

• Urgent
• High
• Medium
• Low

Severity

• Blocker
• Major
• Normal
• Low

Impact

We are getting behind schedule with releases, TCK updates, lot of work to do.

• Was there some change in GlassFish project resources, sponsoring?
• Could it be caused by some file system issues?

I have no idea what to do. I tried at least to use urandom for generating the selfsign certificate, as first what was stuck was keytool, however all other pauses cannot be related to urandom.