Karl Pauls created FELIX-5789: --------------------------------- Summary: Webconsole Memory Usage Plugin can cause deadlock Key: FELIX-5789 URL: https://issues.apache.org/jira/browse/FELIX-5789 Project: Felix Issue Type: Bug Components: Web Console Affects Versions: webconsole-memoryusage-plugin-1.0.6 Reporter: Karl Pauls Fix For: webconsole-memoryusage-plugin-1.0.8
When the o.a.f.webconsole.plugins.memoryusage bundle is refreshed it is possible that it causes a deadlock because it has dynamic imports that are only triggered from inside a service factory callback that is synchronized. That can cause the following deadlock situation: {code:java} "CM Configuration Updater (ManagedService Update: pid=[org.apache.felix.webconsole.plugins.memoryusage.internal.MemoryUsageConfigurator])" #9822 daemon prio=5 os_prio=31 tid=0x00007fe7494c1800 nid=0x9607 in Object.wait() [0x0000700008f4c000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:502) at org.apache.felix.framework.Felix.acquireGlobalLock(Felix.java:5366) - locked <0x00000006c0261148> (a [Ljava.lang.Object;) at org.apache.felix.framework.StatefulResolver.resolve(StatefulResolver.java:528) at org.apache.felix.framework.BundleWiringImpl.searchDynamicImports(BundleWiringImpl.java:1717) at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1617) at org.apache.felix.framework.BundleWiringImpl.access$200(BundleWiringImpl.java:80) at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:2053) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:763) at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.defineClass(BundleWiringImpl.java:2410) at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.findClass(BundleWiringImpl.java:2194) at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1607) at org.apache.felix.framework.BundleWiringImpl.access$200(BundleWiringImpl.java:80) at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:2053) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at org.apache.felix.webconsole.plugins.memoryusage.internal.Activator$3.createObject(Activator.java:72) at org.apache.felix.webconsole.plugins.memoryusage.internal.Activator$AbstractServiceFactory.getService(Activator.java:121) - locked <0x000000077ce19440> (a org.apache.felix.webconsole.plugins.memoryusage.internal.Activator$3) at org.apache.felix.framework.ServiceRegistrationImpl.getFactoryUnchecked(ServiceRegistrationImpl.java:347) at org.apache.felix.framework.ServiceRegistrationImpl.getService(ServiceRegistrationImpl.java:247) at org.apache.felix.framework.ServiceRegistry.getService(ServiceRegistry.java:350) at org.apache.felix.framework.Felix.getService(Felix.java:3737) at org.apache.felix.framework.BundleContextImpl.getService(BundleContextImpl.java:470) at org.apache.felix.cm.impl.helper.BaseTracker.getRealService(BaseTracker.java:207) at org.apache.felix.cm.impl.helper.ManagedServiceTracker.updateService(ManagedServiceTracker.java:102) at org.apache.felix.cm.impl.helper.ManagedServiceTracker.provideConfiguration(ManagedServiceTracker.java:85) at org.apache.felix.cm.impl.ConfigurationManager$ManagedServiceUpdate.provide(ConfigurationManager.java:1097) at org.apache.felix.cm.impl.ConfigurationManager$ManagedServiceUpdate.run(ConfigurationManager.java:1053) at org.apache.felix.cm.impl.UpdateThread.run0(UpdateThread.java:138) at org.apache.felix.cm.impl.UpdateThread.run(UpdateThread.java:105) at java.lang.Thread.run(Thread.java:745) "FelixFrameworkWiring" #21 daemon prio=5 os_prio=31 tid=0x00007fe7450eb000 nid=0x6103 waiting for monitor entry [0x000070000790c000] java.lang.Thread.State: BLOCKED (on object monitor) at org.apache.felix.webconsole.plugins.memoryusage.internal.Activator$AbstractServiceFactory.getService(Activator.java:118) - waiting to lock <0x000000077ce19440> (a org.apache.felix.webconsole.plugins.memoryusage.internal.Activator$3) at org.apache.felix.framework.ServiceRegistrationImpl.getFactoryUnchecked(ServiceRegistrationImpl.java:347) at org.apache.felix.framework.ServiceRegistrationImpl.getService(ServiceRegistrationImpl.java:247) at org.apache.felix.framework.ServiceRegistry.getService(ServiceRegistry.java:350) at org.apache.felix.framework.Felix.getService(Felix.java:3737) at org.apache.felix.framework.BundleContextImpl.getService(BundleContextImpl.java:470) at org.apache.felix.metatype.internal.ManagedServiceTracker.addingService(ManagedServiceTracker.java:52) at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:941) at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:870) at org.osgi.util.tracker.AbstractTracked.trackAdding(AbstractTracked.java:256) at org.osgi.util.tracker.AbstractTracked.trackInitial(AbstractTracked.java:183) at org.osgi.util.tracker.ServiceTracker.open(ServiceTracker.java:318) at org.osgi.util.tracker.ServiceTracker.open(ServiceTracker.java:261) at org.apache.felix.metatype.internal.MetaTypeServiceImpl.<init>(MetaTypeServiceImpl.java:76) at org.apache.felix.metatype.internal.Activator.start(Activator.java:107) at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:697) at org.apache.felix.framework.Felix.activateBundle(Felix.java:2240) at org.apache.felix.framework.Felix.startBundle(Felix.java:2146) at org.apache.felix.framework.Felix$RefreshHelper.restart(Felix.java:5097) at org.apache.felix.framework.Felix.refreshPackages(Felix.java:4291) at org.apache.felix.framework.FrameworkWiringImpl.run(FrameworkWiringImpl.java:188) at java.lang.Thread.run(Thread.java:745) {code} -- This message was sent by Atlassian JIRA (v7.6.3#76005)