Build failed in Jenkins: JMeter-trunk #7725

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See <https://builds.apache.org/job/JMeter-trunk/7725/display/redirect?page=changes>

Changes:

[github] Add a 'Median' field to the dashboard and make the response time


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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
Cloning the remote Git repository
Cloning repository https://gitbox.apache.org/repos/asf/jmeter.git
 > git init <https://builds.apache.org/job/JMeter-trunk/ws/> # 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 config remote.origin.url https://gitbox.apache.org/repos/asf/jmeter.git # timeout=10
 > git config --add remote.origin.fetch +refs/heads/*:refs/remotes/origin/* # timeout=10
 > 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 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 9a8ca629dec1bf70444161988481399332434173 (refs/remotes/origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 9a8ca629dec1bf70444161988481399332434173
Commit message: "Add a 'Median' field to the dashboard and make the response time percentile fields support floating-point numbers (#567)"
 > git rev-list --no-walk d0be716b568d93ffd67406528d187e0e7bba6705 # timeout=10
Xvfb starting$ /usr/bin/Xvfb :1 -fbdir /home/jenkins/jenkins-slave/xvfb-7725-..fbdir7853056930298315031
_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 #7726

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See <https://builds.apache.org/job/JMeter-trunk/7726/display/redirect?page=changes>