DVCS syncing process blocked waiting on cluster lock

"http-nio-8081-exec-102 url:/rest/bitbucket...ository/22436/sync" #1465 daemon prio=5 os_prio=0 tid=0x00007ef11c0ad000 nid=0x172e waiting on condition [0x00007ee92d031000]
 java.lang.Thread.State: TIMED_WAITING (sleeping)
 at java.lang.Thread.sleep(Native Method)
 at com.atlassian.beehive.db.DatabaseClusterLock.sleep(DatabaseClusterLock.java:621)
 at com.atlassian.beehive.db.DatabaseClusterLock.uninterruptibleWait(DatabaseClusterLock.java:127)
 at com.atlassian.beehive.db.DatabaseClusterLock.lock(DatabaseClusterLock.java:107)
 ...
 at com.atlassian.jira.plugins.dvcs.service.MessageExecutor.tryToProcessNextMessage(MessageExecutor.java:185)
 at com.atlassian.jira.plugins.dvcs.service.MessageExecutor$$Lambda$6105/2048706363.accept(Unknown Source)
...