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From "Chetan Mehrotra (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OAK-3442) Intermittent IllegalMonitorStateException seen while releaseing IndexNode
Date Thu, 24 Sep 2015 07:19:04 GMT
Chetan Mehrotra created OAK-3442:
------------------------------------

             Summary: Intermittent IllegalMonitorStateException seen while releaseing IndexNode
                 Key: OAK-3442
                 URL: https://issues.apache.org/jira/browse/OAK-3442
             Project: Jackrabbit Oak
          Issue Type: Bug
          Components: lucene
            Reporter: Chetan Mehrotra
            Assignee: Chetan Mehrotra
            Priority: Minor
             Fix For: 1.3.8


At times following exception seen. On this system the index got corrupted because backing
index files got deleted from the system and hence index is not accessible. 

{noformat}
21.09.2015 09:26:36.764 *ERROR* [FelixStartLevel] com.adobe.granite.repository.impl.SlingRepositoryManager
start: Uncaught Throwable trying to access Repository, calling stopRepository()
java.lang.IllegalMonitorStateException: attempt to unlock read lock, not locked by current
thread
        at java.util.concurrent.locks.ReentrantReadWriteLock$Sync.unmatchedUnlockException(ReentrantReadWriteLock.java:444)
        at java.util.concurrent.locks.ReentrantReadWriteLock$Sync.tryReleaseShared(ReentrantReadWriteLock.java:428)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.releaseShared(AbstractQueuedSynchronizer.java:1341)
        at java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.unlock(ReentrantReadWriteLock.java:881)
        at org.apache.jackrabbit.oak.plugins.index.lucene.IndexNode.release(IndexNode.java:121)
        at org.apache.jackrabbit.oak.plugins.index.lucene.LucenePropertyIndex.getPlans(LucenePropertyIndex.java:212)
        at org.apache.jackrabbit.oak.query.QueryImpl.getBestSelectorExecutionPlan(QueryImpl.java:847)
        at org.apache.jackrabbit.oak.query.QueryImpl.getBestSelectorExecutionPlan(QueryImpl.java:793)
        at org.apache.jackrabbit.oak.query.ast.SelectorImpl.prepare(SelectorImpl.java:283)
        at org.apache.jackrabbit.oak.query.QueryImpl.prepare(QueryImpl.java:568)
        at org.apache.jackrabbit.oak.query.QueryEngineImpl.executeQuery(QueryEngineImpl.java:183)
        at org.apache.jackrabbit.oak.security.user.UserProvider.getAuthorizableByPrincipal(UserProvider.java:234)
        at org.apache.jackrabbit.oak.security.user.UserManagerImpl.getAuthorizable(UserManagerImpl.java:116)
        at org.apache.jackrabbit.oak.security.principal.PrincipalProviderImpl.getAuthorizable(PrincipalProviderImpl.java:140)
        at org.apache.jackrabbit.oak.security.principal.PrincipalProviderImpl.getPrincipal(PrincipalProviderImpl.java:69)
        at org.apache.jackrabbit.oak.spi.security.principal.CompositePrincipalProvider.getPrincipal(CompositePrincipalProvider.java:50)
        at org.apache.jackrabbit.oak.spi.security.principal.PrincipalManagerImpl.getPrincipal(PrincipalManagerImpl.java:47)
        at com.adobe.granite.repository.impl.SlingRepositoryManager.setupPermissions(SlingRepositoryManager.java:997)
        at com.adobe.granite.repository.impl.SlingRepositoryManager.createRepository(SlingRepositoryManager.java:420)
        at com.adobe.granite.repository.impl.SlingRepositoryManager.acquireRepository(SlingRepositoryManager.java:290)
        at org.apache.sling.jcr.base.AbstractSlingRepositoryManager.start(AbstractSlingRepositoryManager.java:304)
        at com.adobe.granite.repository.impl.SlingRepositoryManager.activate(SlingRepositoryManager.java:267)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:483)
        at org.apache.felix.scr.impl.helper.BaseMethod.invokeMethod(BaseMethod.java:222)
        at org.apache.felix.scr.impl.helper.BaseMethod.access$500(BaseMethod.java:37)
        at org.apache.felix.scr.impl.helper.BaseMethod$Resolved.invoke(BaseMethod.java:615)
        at org.apache.felix.scr.impl.helper.BaseMethod.invoke(BaseMethod.java:499)
        at org.apache.felix.scr.impl.helper.ActivateMethod.invoke(ActivateMethod.java:295)
        at org.apache.felix.scr.impl.manager.SingleComponentManager.createImplementationObject(SingleComponentManager.java:302)
        at org.apache.felix.scr.impl.manager.SingleComponentManager.createComponent(SingleComponentManager.java:113)
        at org.apache.felix.scr.impl.manager.SingleComponentManager.getService(SingleComponentManager.java:832)
        at org.apache.felix.scr.impl.manager.SingleComponentManager.getServiceInternal(SingleComponentManager.java:799)
        at org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:724)
        at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:927)
        at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:891)
        at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1492)
        at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1413)
        at org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.trackAdding(ServiceTracker.java:1222)
        at org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.track(ServiceTracker.java:1158)
        at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.serviceChanged(ServiceTracker.java:1444)
        at org.apache.felix.framework.util.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:987)
        at org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:838)
        at org.apache.felix.framework.util.EventDispatcher.fireServiceEvent(EventDispatcher.java:545)
        at org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4547)
        at org.apache.felix.framework.Felix.registerService(Felix.java:3521)
        at org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:348)
        at org.apache.sling.commons.threads.impl.Activator.start(Activator.java:55)
        at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:697)
        at org.apache.felix.framework.Felix.activateBundle(Felix.java:2223)
        at org.apache.felix.framework.Felix.startBundle(Felix.java:2141)
        at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1368)
        at org.apache.felix.framework.FrameworkStartLevelImpl.run(FrameworkStartLevelImpl.java:308)
        at java.lang.Thread.run(Thread.java:745)
{noformat}

Above exception happens at

{code}
for (String path : indexPaths) {
            try {
                indexNode = tracker.acquireIndexNode(path);

                if (indexNode != null) {
                    IndexPlan plan = new IndexPlanner(indexNode, path, filter, sortOrder).getPlan();
                    if (plan != null) {
                        plans.add(plan);
                    }
                }
            } finally {
                if (indexNode != null) {
                    indexNode.release();
                }
            }
        }
{code}

It has been ensured that if indexNode is initialized then it has been acquired. So only way
for such an exception to happen is that in a loop of say 2 paths {{indexNode}} got initialized
for Loop 1 and then while acquiring in Loop 2 the indexNode still refers to old released value
and that would cause the exception. The fix should be simply to null the variable once released



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