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https://issues.apache.org/jira/browse/FELIX-5776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16334158#comment-16334158
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Fabian Lange commented on FELIX-5776:
-------------------------------------
I checked configurations that are still in the dicstionary, they are factory
configurations for components that no longer exist.
So apparently at least the deletion from memory failed
The update task is still backlogged with 166 deletions, but there are way more
in the dictionary that do not correspond to a running service instance.
> Memory Leak by Config Admin
> ---------------------------
>
> Key: FELIX-5776
> URL: https://issues.apache.org/jira/browse/FELIX-5776
> Project: Felix
> Issue Type: Bug
> Components: Configuration Admin
> Affects Versions: configadmin-1.8.16
> Reporter: Fabian Lange
> Priority: Major
> Attachments: Screen Shot 2018-01-22 at 11.26.39.png, Screen Shot
> 2018-01-22 at 11.28.14.png
>
>
> I have a heapdump (which I cannot share publicly) of a karaf container which
> crashed due to out of memory.
> The Heapdump shows 30mb occupied by
> org.apache.felix.cm.impl.CachingPersistenceManagerProxy including several
> related classes.
> I am going to attach a few screenshots from MAT/JProfiler.
> There are a few threads involved which look interesting.
>
> {noformat}
> Thread "CM Configuration Updater (Delete:
> pid=ce24c1344-88bb-4c66-bebc-527cc574f347)":
> at sun.misc.Unsafe.park(boolean, long)
> at java.util.concurrent.locks.LockSupport.park(java.lang.Object) (line:
> 175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt()
> (line: 836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(java.util.concurrent.locks.AbstractQueuedSynchronizer$Node,
> int) (line: 870)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(int)
> (line: 1199)
> at java.util.concurrent.locks.ReentrantReadWriteLock$WriteLock.lock()
> (line: 943)
> at
> org.apache.felix.cm.impl.CachingPersistenceManagerProxy.store(java.lang.String,
> java.util.Dictionary) (line: 245)
> at org.apache.felix.cm.impl.Factory.store() (line: 137)
> at
> org.apache.felix.cm.impl.ConfigurationManager$DeleteConfiguration.run()
> (line: 1876)
> at org.apache.felix.cm.impl.UpdateThread.run0(java.lang.Runnable) (line:
> 141)
> at org.apache.felix.cm.impl.UpdateThread.run() (line: 109)
> at java.lang.Thread.run() (line: 748)
> Thread "updater-thread-1":
> at sun.misc.Unsafe.park(boolean, long)
> at java.util.concurrent.locks.LockSupport.park(java.lang.Object) (line:
> 175)
> at java.util.concurrent.FutureTask.awaitDone(boolean, long) (line: 429)
> at java.util.concurrent.FutureTask.get() (line: 191)
> at
> org.apache.karaf.features.internal.service.FeaturesServiceImpl.doProvisionInThread(java.util.Map,
> java.util.Map, org.apache.karaf.features.internal.service.State,
> java.util.EnumSet) (line: 1134)
> at
> org.apache.karaf.features.internal.service.FeaturesServiceImpl.addRequirements(java.util.Map,
> java.util.EnumSet) (line: 1077)
> Thread "features-1-thread-1":
> at sun.misc.Unsafe.park(boolean, long)
> at java.util.concurrent.locks.LockSupport.park(java.lang.Object) (line:
> 175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt()
> (line: 836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared(int)
> (line: 967)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(int)
> (line: 1283)
> at java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock()
> (line: 727)
> at
> org.apache.felix.cm.impl.CachingPersistenceManagerProxy.getDictionaries(org.apache.felix.cm.impl.SimpleFilter)
> (line: 137)
> at
> org.apache.felix.cm.impl.ConfigurationManager.listConfigurations(org.apache.felix.cm.impl.ConfigurationAdminImpl,
> java.lang.String) (line: 660)
> at
> org.apache.felix.cm.impl.ConfigurationAdminImpl.listConfigurations(java.lang.String)
> (line: 190)
> at
> org.apache.felix.scr.impl.manager.RegionConfigurationSupport.findConfigurations(org.osgi.service.cm.ConfigurationAdmin,
> java.lang.String) (line: 605)
> at
> org.apache.felix.scr.impl.manager.RegionConfigurationSupport.findFactoryConfigurations(org.osgi.service.cm.ConfigurationAdmin,
> java.lang.String, org.osgi.framework.Bundle) (line: 540)
> at
> org.apache.felix.scr.impl.manager.RegionConfigurationSupport.configureComponentHolder(org.apache.felix.scr.impl.manager.ComponentHolder)
> (line: 143)
> at
> org.apache.felix.scr.impl.BundleComponentActivator.setRegionConfigurationSupport(org.osgi.framework.ServiceReference)
> (line: 833)
> at
> org.apache.felix.scr.impl.helper.ConfigAdminTracker$1.addingService(org.osgi.framework.ServiceReference)
> (line: 71)
> at
> org.apache.felix.scr.impl.helper.ConfigAdminTracker$1.addingService(org.osgi.framework.ServiceReference)
> (line: 43)
> at
> org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(org.osgi.framework.ServiceReference,
> org.osgi.framework.ServiceEvent) (line: 941)
> at
> org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(java.lang.Object,
> java.lang.Object) (line: 870)
> at org.osgi.util.tracker.AbstractTracked.trackAdding(java.lang.Object,
> java.lang.Object) (line: 256)
> at org.osgi.util.tracker.AbstractTracked.trackInitial() (line: 183)
> at org.osgi.util.tracker.ServiceTracker.open(boolean) (line: 318)
> at org.osgi.util.tracker.ServiceTracker.open() (line: 261)
> at
> org.apache.felix.scr.impl.helper.ConfigAdminTracker.<init>(org.apache.felix.scr.impl.manager.ComponentActivator)
> (line: 88)
> at
> org.apache.felix.scr.impl.BundleComponentActivator.<init>(org.apache.felix.scr.impl.helper.SimpleLogger,
> org.apache.felix.scr.impl.ComponentRegistry,
> org.apache.felix.scr.impl.ComponentActorThread,
> org.osgi.framework.BundleContext,
> org.apache.felix.scr.impl.manager.ScrConfiguration) (line: 274)
> at
> org.apache.felix.scr.impl.Activator.loadComponents(org.osgi.framework.Bundle)
> (line: 388)
> at
> org.apache.felix.scr.impl.Activator.access$200(org.apache.felix.scr.impl.Activator,
> org.osgi.framework.Bundle) (line: 54)
> at org.apache.felix.scr.impl.Activator$ScrExtension.start() (line: 265)
> at
> org.apache.felix.utils.extender.AbstractExtender.createExtension(org.osgi.framework.Bundle)
> (line: 254)
> at
> org.apache.felix.utils.extender.AbstractExtender.modifiedBundle(org.osgi.framework.Bundle,
> org.osgi.framework.BundleEvent, java.lang.Object) (line: 227)
> at
> org.osgi.util.tracker.BundleTracker$Tracked.customizerModified(org.osgi.framework.Bundle,
> org.osgi.framework.BundleEvent, java.lang.Object) (line: 482)
> at
> org.osgi.util.tracker.BundleTracker$Tracked.customizerModified(java.lang.Object,
> java.lang.Object, java.lang.Object) (line: 415)
> at org.osgi.util.tracker.AbstractTracked.track(java.lang.Object,
> java.lang.Object) (line: 232)
> at
> org.osgi.util.tracker.BundleTracker$Tracked.bundleChanged(org.osgi.framework.BundleEvent)
> (line: 444)
> at
> org.apache.felix.framework.EventDispatcher.invokeBundleListenerCallback(org.osgi.framework.Bundle,
> java.util.EventListener, java.util.EventObject) (line: 915)
> at
> org.apache.felix.framework.EventDispatcher.fireEventImmediately(org.apache.felix.framework.EventDispatcher,
> int, java.util.Map, java.util.EventObject, java.util.Dictionary) (line: 834)
> at
> org.apache.felix.framework.EventDispatcher.fireBundleEvent(org.osgi.framework.BundleEvent,
> org.apache.felix.framework.Felix) (line: 516)
> at org.apache.felix.framework.Felix.fireBundleEvent(int,
> org.osgi.framework.Bundle) (line: 4563)
> at
> org.apache.felix.framework.Felix.startBundle(org.apache.felix.framework.BundleImpl,
> int) (line: 2173)
> at org.apache.felix.framework.BundleImpl.start(int) (line: 998)
> at org.apache.felix.framework.BundleImpl.start() (line: 984)
> at
> org.apache.karaf.features.internal.service.FeaturesServiceImpl.startBundle(org.osgi.framework.Bundle)
> (line: 1346)
> at
> org.apache.karaf.features.internal.service.Deployer.deploy(org.apache.karaf.features.internal.service.Deployer$DeploymentState,
> org.apache.karaf.features.internal.service.Deployer$DeploymentRequest)
> (line: 891)
> at
> org.apache.karaf.features.internal.service.FeaturesServiceImpl.doProvision(java.util.Map,
> java.util.Map, org.apache.karaf.features.internal.service.State,
> java.util.EnumSet, java.lang.String) (line: 1233)
> at
> org.apache.karaf.features.internal.service.FeaturesServiceImpl.lambda$doProvisionInThread$0(java.util.Map,
> java.util.Map, org.apache.karaf.features.internal.service.State,
> java.util.EnumSet, java.lang.String) (line: 1132)
> at
> org.apache.karaf.features.internal.service.FeaturesServiceImpl$$Lambda$16.call()
> at java.util.concurrent.FutureTask.run() (line: 266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker)
> (line: 1142)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run() (line: 617)
> at java.lang.Thread.run() (line: 748)
> {noformat}
>
> This might as well be a karaf bug.
> While it looks like a memory leak, I could also suspect that this might be
> cause by a concurrency problem, as the threadump shows multiple updating
> threads.
> I can provide more details if required, or share the dump privately.
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