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https://issues.apache.org/jira/browse/JCR-2554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12844058#action_12844058
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Robert Sauer commented on JCR-2554:
-----------------------------------
Ok, I was just about to verify but will wait then.
Admittedly your patch is pretty elegant due to the small change required.
Still I have some reservation on having the underlying assumption of locks
being bound to threads, and working around this assumption if an XID is
present. Wonder how this carries over to java.util.concurrency eventually.
Thanks
Robert
> Deadlock inside XASession on Weblogic
> -------------------------------------
>
> Key: JCR-2554
> URL: https://issues.apache.org/jira/browse/JCR-2554
> Project: Jackrabbit Content Repository
> Issue Type: Bug
> Components: jackrabbit-core
> Affects Versions: 1.6.1, 2.0.0
> Environment: Weblogic 9.2
> Reporter: Robert Sauer
> Assignee: Claus Köll
> Priority: Critical
> Attachments: ConcurrentReaders.java,
> jr-core-xid-aware-ism-locking1.patch, Xid.patch
>
>
> In one of our client deployments on WebLogic 9.2 we observed JackRabbit
> sessions going stale in a load test. This was observed against release 1.6.1
> (to which we migrated due to concurrency related issues JCR-2081 and
> JCR-2237). Same effect with 2.0.0.
>
> I could finally reproduce this issue locally. And it seems to boil down to
> WLS invoking the sequence of <prepare> ... <release> ... <commit> on one XA
> session from multiple threads, as it seems breaking assumptions of the
> thread-bound java.util.concurrent-RWLock based DefaultISMLocking class.
> Effectively the setActiveXid(..) method on DefaultISMLocking$RWLock fails as
> the old active XID was not yet cleared. With the result of more and more
> sessions deadlocking in below's invocation stack.
> {code}
> "[ACTIVE] ExecuteThread: '27' for queue: 'weblogic.kernel.Default
> (self-tuning)'" daemon prio=1 tid=0x33fc3ec0 nid=0x2324 in Object.wait()
> [0x2156a000..0x2156beb0] at java.lang.Object.wait(Native Method) - waiting on
> <0x68a54698> (a
> EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock$WriterLock) at
> java.lang.Object.wait(Object.java:474) at
> EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock$WriterLock.acquire(Unknown
> Source) - locked <0x68a54698> (a
> EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock$WriterLock) at
> org.apache.jackrabbit.core.state.DefaultISMLocking$1.<init>(DefaultISMLocking.java:64)
> at
> org.apache.jackrabbit.core.state.DefaultISMLocking.acquireWriteLock(DefaultISMLocking.java:61)
> at
> org.apache.jackrabbit.core.version.AbstractVersionManager.acquireWriteLock(AbstractVersionManager.java:146)
> at
> org.apache.jackrabbit.core.version.XAVersionManager$1.prepare(XAVersionManager.java:562)
> at
> org.apache.jackrabbit.core.TransactionContext.prepare(TransactionContext.java:154)
> - locked <0x6dc2ad88> (a org.apache.jackrabbit.core.TransactionContext) at
> org.apache.jackrabbit.core.XASessionImpl.prepare(XASessionImpl.java:331) at
> org.apache.jackrabbit.jca.TransactionBoundXAResource.prepare(TransactionBoundXAResource.java:68)
> at
> weblogic.connector.security.layer.AdapterLayer.prepare(AdapterLayer.java:397)
> at
> weblogic.connector.transaction.outbound.XAWrapper.prepare(XAWrapper.java:297)
> at
> weblogic.transaction.internal.XAServerResourceInfo.prepare(XAServerResourceInfo.java:1276)
> at
> weblogic.transaction.internal.XAServerResourceInfo.prepare(XAServerResourceInfo.java:499)
> at
> weblogic.transaction.internal.ServerSCInfo$1.execute(ServerSCInfo.java:335)
> at weblogic.kernel.Kernel.executeIfIdle(Kernel.java:243) at
> weblogic.transaction.internal.ServerSCInfo.startPrepare(ServerSCInfo.java:326)
> at
> weblogic.transaction.internal.ServerTransactionImpl.localPrepare(ServerTransactionImpl.java:2516)
> at
> weblogic.transaction.internal.ServerTransactionImpl.globalPrepare(ServerTransactionImpl.java:2211)
> at
> weblogic.transaction.internal.ServerTransactionImpl.internalCommit(ServerTransactionImpl.java:266)
> at
> weblogic.transaction.internal.ServerTransactionImpl.commit(ServerTransactionImpl.java:227)
> at
> weblogic.transaction.internal.TransactionManagerImpl.commit(TransactionManagerImpl.java:283)
> at
> org.springframework.transaction.jta.JtaTransactionManager.doCommit(JtaTransactionManager.java:1028)
> at
> org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:709)
> at
> org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:678)
> {code}
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