Zuletzt aktualisiert am
Apr 30, 2021 11:48:25 PM GMT
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.
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