Github user hanm commented on the issue:
https://github.com/apache/zookeeper/pull/628
jenkins ran both java and C client tests. In this case, it's one of C
client tests failed.
`[exec] [exec] *** Error in `./zktest-mt': free(): invalid pointer:
0x00002b971c71e000 ***`
https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/2184/console
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