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https://issues.apache.org/jira/browse/OAK-4687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15430442#comment-15430442
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Chetan Mehrotra commented on OAK-4687:
--------------------------------------
Added ignored test in 1757127
> Issue with backgroundOperationLock handling in exception case
> -------------------------------------------------------------
>
> Key: OAK-4687
> URL: https://issues.apache.org/jira/browse/OAK-4687
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: documentmk
> Reporter: Chetan Mehrotra
> Assignee: Marcel Reutegger
> Priority: Minor
> Fix For: 1.6
>
>
> If in a commit some exception occurs then that exception gets hidden due to
> error in exception handling code path in DocumentNodeStore
> Instead of original exception following exception is seen
> {noformat}
> Caused by: java.lang.IllegalMonitorStateException: attempt to unlock read
> lock, not locked by current thread
> at
> java.util.concurrent.locks.ReentrantReadWriteLock$Sync.unmatchedUnlockException(ReentrantReadWriteLock.java:447)
> at
> java.util.concurrent.locks.ReentrantReadWriteLock$Sync.tryReleaseShared(ReentrantReadWriteLock.java:431)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.releaseShared(AbstractQueuedSynchronizer.java:1340)
> at
> java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.unlock(ReentrantReadWriteLock.java:883)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.canceled(DocumentNodeStore.java:767)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreBranch.persist(DocumentNodeStoreBranch.java:303)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreBranch.persist(DocumentNodeStoreBranch.java:268)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreBranch.access$300(DocumentNodeStoreBranch.java:58)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreBranch$InMemory.merge(DocumentNodeStoreBranch.java:513)
> ... 36 more
> {noformat}
> This happens because the lock is released twice
> # Once in DocumentNodeStore#done
> # Second in DocumentNodeStore#canceled. Invoked in case of failure in
> DocumentNodeStoreBranch#persist
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