Github user anmolnar commented on the issue:
https://github.com/apache/zookeeper/pull/300
@lavacat It's pretty much clear to me that there's a deadlock in the
follower probably at the change where it's waiting for commits to be processed:
```
zk.waitForCommits();
```
Follower is unable to process the response for REVALIDATE from the leader,
because it's blocked at this wait. Most likely.
Trying to find the root cause in #677 , but cannot repro the failure with
trace logging enabled. ---
