Deadlock zwischen den Diensten OakDiscoveryService.unbindTopologyEventListener und OakViewChecker.discoveryLiteCheck

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Problem

Nach der Installation eines Hotfix für die Bereitstellung eines Anwendungsbündels ist AEM6.2 vollständig blockiert.  Nachdem Thread-Sicherheitskopien in einem Analyseprogramm für Thread-Sicherheitskopien (lwie http://fastthread.io oder IBM Thread Analyzer) erfasst und geöffnet wurden, meldet das Analyseprogramm einen Deadlock.  

Der gemeldete Deadlock liegt zwischen zwei Threads wie den untenstehenden vor:

Thread [1] ruft org.apache.sling.discovery.oak.OakDiscoveryService.unbindTopologyEventListener

Threads [2] ruft org.apache.sling.discovery.oak.pinger.OakViewChecker.discoveryLiteCheck

Manchmal kann es sich bei dem Deadlock um einen runden Deadlock mit einem dritten involvierten Thread handeln.

[1]

"LeaseFailureHandler-Thread" daemon prio=5 tid=0x7f34 nid=0xffffffff in Object.wait()
   java.lang.Thread.State: WAITING (on object monitor)
        at sun.misc.Unsafe.park(Native Method)
        - waiting to lock <0x575a7644> (a java.util.concurrent.locks.ReentrantLock$NonfairSync) owned by "discovery.connectors.common.runner.e8dd34be-8886-4e5d-891f-5509b4dea0f0.discoveryLiteChec
k" tid=0x4,330
        at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:867)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1197)
        at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:214)
        at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:290)
        at org.apache.sling.discovery.oak.OakDiscoveryService.unbindTopologyEventListener(OakDiscoveryService.java:368)
...
        at org.apache.felix.framework.ServiceRegistrationImpl.unregister(ServiceRegistrationImpl.java:144)
        at org.apache.sling.resourceresolver.impl.ResourceResolverFactoryActivator.unregisterFactory(ResourceResolverFactoryActivator.java:611)
        at org.apache.sling.resourceresolver.impl.ResourceResolverFactoryActivator.unregisterFactory(ResourceResolverFactoryActivator.java:602)
        at org.apache.sling.resourceresolver.impl.ResourceResolverFactoryActivator.checkFactoryPreconditions(ResourceResolverFactoryActivator.java:674)
        at org.apache.sling.resourceresolver.impl.ResourceResolverFactoryActivator.access$100(ResourceResolverFactoryActivator.java:79)
        at org.apache.sling.resourceresolver.impl.ResourceResolverFactoryActivator$1.providerRemoved(ResourceResolverFactoryActivator.java:500)
        at org.apache.sling.resourceresolver.impl.providers.ResourceProviderTracker.unregister(ResourceProviderTracker.java:224)
        - locked <0x35cd7613> (a java.util.HashMap)
        at org.apache.sling.resourceresolver.impl.providers.ResourceProviderTracker.access$100(ResourceProviderTracker.java:58)
        at org.apache.sling.resourceresolver.impl.providers.ResourceProviderTracker$1.removedService(ResourceProviderTracker.java:109)
...
        at org.apache.felix.framework.ServiceRegistrationImpl.unregister(ServiceRegistrationImpl.java:144)
        at org.apache.sling.jcr.base.AbstractSlingRepositoryManager.unregisterService(AbstractSlingRepositoryManager.java:262)
        at org.apache.sling.jcr.base.AbstractSlingRepositoryManager.stop(AbstractSlingRepositoryManager.java:389)
...
        at org.apache.felix.framework.BundleImpl.stop(BundleImpl.java:1038)
        at org.apache.felix.framework.BundleImpl.stop(BundleImpl.java:1024)
        at org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreService$1.handleLeaseFailure(DocumentNodeStoreService.java:413)
        at org.apache.jackrabbit.oak.plugins.document.ClusterNodeInfo$1.run(ClusterNodeInfo.java:696)
        at java.lang.Thread.run(Thread.java:745)


   Locked ownable synchronizers:
        - locked <0x4402f4fd> (a java.util.concurrent.locks.ReentrantLock$FairSync)
        - locked <0x1e2230ed> (a java.util.concurrent.locks.ReentrantLock$FairSync)
        - locked <0x56ba270f> (a java.util.concurrent.locks.ReentrantLock$FairSync)

[2]

"discovery.connectors.common.runner.e8dd34be-8886-4e5d-891f-5509b4dea0f0.discoveryLiteCheck" daemon prio=5 tid=0x10ea nid=0xffffffff waiting for monitor entry
   java.lang.Thread.State: BLOCKED
        at org.apache.sling.resourceresolver.impl.providers.ResourceProviderTracker.getResourceProviderStorage(ResourceProviderTracker.java:364)
        - waiting to lock <0x35cd7613> (a java.util.HashMap) owned by "LeaseFailureHandler-Thread" tid=0x32,564
        at org.apache.sling.resourceresolver.impl.ResourceResolverImpl.createControl(ResourceResolverImpl.java:154)
        at org.apache.sling.resourceresolver.impl.ResourceResolverImpl.<init>(ResourceResolverImpl.java:116)
        at org.apache.sling.resourceresolver.impl.ResourceResolverImpl.<init>(ResourceResolverImpl.java:110)
        at org.apache.sling.resourceresolver.impl.CommonResourceResolverFactoryImpl.getResourceResolverInternal(CommonResourceResolverFactoryImpl.java:257)
        at org.apache.sling.resourceresolver.impl.CommonResourceResolverFactoryImpl.getAdministrativeResourceResolver(CommonResourceResolverFactoryImpl.java:140)
        at org.apache.sling.resourceresolver.impl.ResourceResolverFactoryImpl.getAdministrativeResourceResolver(ResourceResolverFactoryImpl.java:107)
        at org.apache.sling.discovery.oak.cluster.OakClusterViewService.getResourceResolver(OakClusterViewService.java:103)
        at org.apache.sling.discovery.oak.cluster.OakClusterViewService.getLocalClusterView(OakClusterViewService.java:110)
        at org.apache.sling.discovery.base.commons.BaseDiscoveryService.getTopology(BaseDiscoveryService.java:77)
        at org.apache.sling.discovery.oak.OakDiscoveryService.checkForTopologyChange(OakDiscoveryService.java:657)
        at org.apache.sling.discovery.oak.pinger.OakViewChecker.discoveryLiteCheck(OakViewChecker.java:232)
        - locked <0x740a9729> (a java.lang.Object)
        at org.apache.sling.discovery.oak.pinger.OakViewChecker.access$000(OakViewChecker.java:64)
        at org.apache.sling.discovery.oak.pinger.OakViewChecker$1.run(OakViewChecker.java:208)
        at org.apache.sling.discovery.base.commons.PeriodicBackgroundJob.safelyRun(PeriodicBackgroundJob.java:86)
        at org.apache.sling.discovery.base.commons.PeriodicBackgroundJob.run(PeriodicBackgroundJob.java:77)
        at java.lang.Thread.run(Thread.java:745)

   Locked ownable synchronizers:
        - locked <0x575a7644> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)

Ursache

Bekannter Apache Sling-Fehler: SLING-5622.  Dieses Problem tritt nur bei Installationen von AEM 6.2 vor SP1 auf.  Wenn SP1 bereits erfolgreich angewendet wurde, sollte dieses Problem nicht auftreten.

Lösung

Dieses Problem tritt nur vor der Installation von SP1 auf.  Um dieses Problem zu beheben, wenden Sie sich an den AEM Kundendienst und fordern Sie Hotfix 11473 an.  Dieser Fix ist im Service Pack 1 bereits enthalten.