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https://issues.apache.org/jira/browse/FELIX-3839?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Clement Escoffier closed FELIX-3839.
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> iPOJO deadlocks on a bundle refresh
> -----------------------------------
>
> Key: FELIX-3839
> URL: https://issues.apache.org/jira/browse/FELIX-3839
> Project: Felix
> Issue Type: Bug
> Components: iPOJO
> Affects Versions: ipojo-core-1.8.4, ipojo-runtime-1.8.6
> Reporter: Jad Naous
> Assignee: Clement Escoffier
> Fix For: ipojo-runtime-1.8.6
>
>
> iPOJO grabs a number of locks during synchronous callbacks from the
> framework, some in InstanceCreator and some in IPojoFactory. This can cause a
> repeatable deadlock situation during service registration (which attempts to
> grab the global felix framework lock, fixed in FELIX-3761) or during class
> resolution (still a problem). iPOJO should not be grabbing any locks during
> callbacks from the framework because those callbacks may be holding framework
> locks, and if another thread invokes the framework while holding the same
> lock, a deadlock will result. Below are stack traces two deadlock situations.
> Here's the stack trace that causes the deadlock in the first situation, which
> happens before FELIX-3761, but really shouldn't happen with or without that
> fix:
> Daemon Thread [Thread-1] (Suspended)
> Object.wait(long) line: not available [native method]
> Object[](Object).wait() line: 485
> Felix.acquireBundleLock(BundleImpl, int) line: 4871
> Felix.registerService(BundleImpl, String[], Object, Dictionary) line:
> 3205
> BundleContextImpl.registerService(String[], Object, Dictionary) line:
> 346
> IPojoContext.registerService(String[], Object, Dictionary) line: 385
> ProvidedService.registerService() line: 362
> ProvidedServiceHandler.__M_stateChanged(int) line: 509
> ProvidedServiceHandler.stateChanged(int) line: not available
> InstanceManager.setState(int) line: 536
> InstanceManager.start() line: 418
> ComponentFactory.createInstance(Dictionary, IPojoContext,
> HandlerManager[]) line: 179
> ComponentFactory(IPojoFactory).createComponentInstance(Dictionary,
> ServiceContext) line: 310
> ComponentFactory(IPojoFactory).createComponentInstance(Dictionary)
> line: 239
> InstanceCreator$ManagedInstance.create(IPojoFactory) line: 355
> InstanceCreator.addInstance(Dictionary, long) line: 89
> Extender.parse(Bundle, String) line: 306
> Extender.startManagementFor(Bundle) line: 237
> Extender.access$600(Extender, Bundle) line: 52
> Extender$CreatorThread.run() line: 769
> Thread.run() line: 662
> Daemon Thread [FelixFrameworkWiring] (Suspended)
> InstanceCreator.removeInstancesFromBundle(long) line: 116
> Extender.closeManagementFor(Bundle) line: 171
> Extender.bundleChanged(BundleEvent) line: 153
> EventDispatcher.invokeBundleListenerCallback(Bundle, EventListener,
> EventObject) line: 868
> EventDispatcher.fireEventImmediately(EventDispatcher, int, Map,
> EventObject, Dictionary) line: 789
> EventDispatcher.fireBundleEvent(BundleEvent, Framework) line: 514
> Felix.fireBundleEvent(int, Bundle) line: 4244
> Felix.stopBundle(BundleImpl, boolean) line: 2351
> Felix$RefreshHelper.stop() line: 4629
> Felix.refreshPackages(Collection, FrameworkListener[]) line: 3951
> FrameworkWiringImpl.run() line: 172
> Thread.run() line: 662
> Here's the stack trace for the other situation caused by class resolution in
> the framework:
> Name: Thread-2
> State: WAITING on [Ljava.lang.Object;@4a018e1b
> Total blocked: 38,871,649 Total waited: 38,871,650
> Stack trace:
> java.lang.Object.wait(Native Method)
> java.lang.Object.wait(Object.java:485)
> org.apache.felix.framework.Felix.acquireGlobalLock(Felix.java:5033)
> org.apache.felix.framework.StatefulResolver.resolve(StatefulResolver.java:451)
> org.apache.felix.framework.BundleWiringImpl.searchDynamicImports(BundleWiringImpl.java:1578)
> org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1478)
> org.apache.felix.framework.BundleWiringImpl.access$400(BundleWiringImpl.java:75)
> org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1882)
> java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> org.apache.felix.framework.BundleWiringImpl.getClassByDelegation(BundleWiringImpl.java:1356)
> org.apache.felix.framework.ServiceRegistrationImpl$ServiceReferenceImpl.isAssignableTo(ServiceRegistrationImpl.java:548)
> org.apache.felix.framework.util.Util.isServiceAssignable(Util.java:280)
> org.apache.felix.framework.util.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:916)
> org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:793)
> org.apache.felix.framework.util.EventDispatcher.fireServiceEvent(EventDispatcher.java:543)
> org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4346)
> org.apache.felix.framework.Felix.registerService(Felix.java:3356)
> org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:346)
> org.apache.felix.ipojo.IPojoFactory.start(IPojoFactory.java:613)
> - locked org.apache.felix.ipojo.ComponentFactory@468034b6
> org.apache.felix.ipojo.Extender.createAbstractFactory(Extender.java:520)
> org.apache.felix.ipojo.Extender.parse(Extender.java:301)
> org.apache.felix.ipojo.Extender.startManagementFor(Extender.java:237)
> org.apache.felix.ipojo.Extender.access$600(Extender.java:52)
> org.apache.felix.ipojo.Extender$CreatorThread.run(Extender.java:769)
> java.lang.Thread.run(Thread.java:662)
> Name: FelixFrameworkWiring
> State: BLOCKED on org.apache.felix.ipojo.ComponentFactory@468034b6 owned by:
> Thread-2
> Total blocked: 7 Total waited: 1
> Stack trace:
> org.apache.felix.ipojo.IPojoFactory.removeFactoryStateListener(IPojoFactory.java:511)
> org.apache.felix.ipojo.InstanceCreator.removeFactory(InstanceCreator.java:199)
> org.apache.felix.ipojo.Extender.closeManagementFor(Extender.java:180)
> org.apache.felix.ipojo.Extender.bundleChanged(Extender.java:153)
> org.apache.felix.framework.util.EventDispatcher.invokeBundleListenerCallback(EventDispatcher.java:868)
> org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:789)
> org.apache.felix.framework.util.EventDispatcher.fireBundleEvent(EventDispatcher.java:514)
> org.apache.felix.framework.Felix.fireBundleEvent(Felix.java:4330)
> org.apache.felix.framework.Felix.stopBundle(Felix.java:2451)
> org.apache.felix.framework.Felix$RefreshHelper.stop(Felix.java:4715)
> org.apache.felix.framework.Felix.refreshPackages(Felix.java:4037)
> org.apache.felix.framework.FrameworkWiringImpl.run(FrameworkWiringImpl.java:178)
> java.lang.Thread.run(Thread.java:662)
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