Jenkins test suite failed due to "channel stopped" error after all tests passed

[kennknowles]

For example, see following.
https://builds.apache.org/view/A-D/view/Beam/job/beam_PreCommit_Java_MavenInstall/15748/console

017-11-21T02:47:36.514 [INFO] ------------------------------------------------------------------------
2017-11-21T02:47:36.514 [INFO] BUILD SUCCESS
2017-11-21T02:47:36.514 [INFO] ------------------------------------------------------------------------
2017-11-21T02:47:36.514 [INFO] Total time: 01:01 h
2017-11-21T02:47:36.514 [INFO] Finished at: 2017-11-21T02:47:36****00:00
2017-11-21T02:47:37.642 [INFO] Final Memory: 414M/1696M
2017-11-21T02:47:37.643 [INFO] ------------------------------------------------------------------------
channel stopped
Setting status of 3b0714e to FAILURE with url https://builds.apache.org/job/beam_PreCommit_Java_MavenInstall/15748/ and message: 'FAILURE
'
Using context: Jenkins: mvn clean install -pl sdks/java/core,runners/direct-java,sdks/java/fn-execution -am -amd
Finished: UNSTABLE

All tests passed but test suite is marked as failed.

Imported from Jira BEAM-3229. Original Jira may contain additional context.
Reported by: chamikara.