Build failed in Jenkins: JMeter-trunk #7728

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See <https://builds.apache.org/job/JMeter-trunk/7728/display/redirect?page=changes>

Changes:

[pmouawad] Clarify documentation related to Bug report 64245


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Started by an SCM change
Started by an SCM change
Running as SYSTEM
[EnvInject] - Loading node environment variables.
Building remotely on H27 (ubuntu) in workspace <https://builds.apache.org/job/JMeter-trunk/ws/>
No credentials specified
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://gitbox.apache.org/repos/asf/jmeter.git # timeout=10
Fetching upstream changes from https://gitbox.apache.org/repos/asf/jmeter.git
 > git --version # timeout=10
 > git fetch --tags --progress -- https://gitbox.apache.org/repos/asf/jmeter.git +refs/heads/*:refs/remotes/origin/*
 > git rev-parse refs/remotes/origin/master^{commit} # timeout=10
 > git rev-parse refs/remotes/origin/origin/master^{commit} # timeout=10
Checking out Revision 225eaf6d49bea86cf45571aa38630a6b0703a2fe (refs/remotes/origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 225eaf6d49bea86cf45571aa38630a6b0703a2fe
Commit message: "Clarify documentation related to Bug report 64245"
 > git rev-list --no-walk 0772c1d97e49aa6c5e615f1fc02ba7bd215c710b # timeout=10
Xvfb starting$ /usr/bin/Xvfb :1 -fbdir /home/jenkins/jenkins-slave/xvfb-7728-..fbdir5151121575543849771
_XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: server already running
(EE) 
Fatal server error:
(EE) Cannot establish any listening sockets - Make sure an X server isn't already running(EE) 

ERROR: Xvfb failed to start, consult the lines above for errors
Archiving artifacts
Recording test results
ERROR: Step ?Publish JUnit test result report? failed: No test report files were found. Configuration error?

Jenkins build is back to normal : JMeter-trunk #7729

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See <https://builds.apache.org/job/JMeter-trunk/7729/display/redirect?page=changes>