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From "Richard S. Hall (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FELIX-3953) Deadlock in classloaders
Date Wed, 06 Mar 2013 00:14:14 GMT

    [ https://issues.apache.org/jira/browse/FELIX-3953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13594134#comment-13594134
] 

Richard S. Hall commented on FELIX-3953:
----------------------------------------

I can't see anything obvious. I would guess it is related to the standard class loader locking
strategy of the JVM pre-parallel class loaders. It is possible that somewhere in here the
JVM is grabbing the class loader monitor:

at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.findClass(BundleWiringImpl.java:2228)
at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1472)
at org.apache.felix.framework.BundleWiringImpl.access$400(BundleWiringImpl.java:75)
at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1923)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at org.apache.felix.framework.Felix.loadBundleClass(Felix.java:1862)

The framework doesn't hold class loader locks itself. One way you could test this is to try
the experimental VM class loading flags with Java 6, I think they were:

    -XX:+UnlockDiagnosticVMOptions -XX:+UnsyncloadClass

They had these before the parallel-aware class loaders in Java 7.
                
> Deadlock in classloaders
> ------------------------
>
>                 Key: FELIX-3953
>                 URL: https://issues.apache.org/jira/browse/FELIX-3953
>             Project: Felix
>          Issue Type: Bug
>    Affects Versions: framework-4.2.0
>         Environment: JDK 6
>            Reporter: Guillaume Nodet
>
> The two threads seem to deadlock
> {code}
> "pool-org.fusesource.patch.patch-core-7.2.0.redhat-012-thread-1" prio=6 tid=0x32f60400
nid=0x1110 in Object.wait() [0x3b55e000]
>    java.lang.Thread.State: WAITING (on object monitor)
> 	at java.lang.Object.wait(Native Method)
> 	- waiting on <0x25e09670> (a java.util.HashMap)
> 	at java.lang.Object.wait(Object.java:485)
> 	at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.findClass(BundleWiringImpl.java:2050)
> 	- locked <0x25e09670> (a java.util.HashMap)
> 	at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1472)
> 	at org.apache.felix.framework.BundleWiringImpl.access$400(BundleWiringImpl.java:75)
> 	at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1923)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> 	at java.lang.ClassLoader.defineClass1(Native Method)
> 	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
> 	at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
> 	at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.findClass(BundleWiringImpl.java:2228)
> 	at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1472)
> 	at org.apache.felix.framework.BundleWiringImpl.access$400(BundleWiringImpl.java:75)
> 	at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1923)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> 	at org.apache.felix.framework.Felix.loadBundleClass(Felix.java:1862)
> 	at org.apache.felix.framework.BundleImpl.loadClass(BundleImpl.java:937)
> 	at org.apache.aries.blueprint.container.BlueprintContainerImpl.loadClass(BlueprintContainerImpl.java:419)
> 	at org.apache.aries.blueprint.container.BlueprintRepository.loadClass(BlueprintRepository.java:410)
> 	at org.apache.aries.blueprint.container.GenericType.parse(GenericType.java:113)
> 	at org.apache.aries.blueprint.di.AbstractRecipe.doLoadType(AbstractRecipe.java:168)
> 	at org.apache.aries.blueprint.di.AbstractRecipe.loadType(AbstractRecipe.java:161)
> 	at org.apache.aries.blueprint.container.BeanRecipe.loadClass(BeanRecipe.java:249)
> 	at org.apache.aries.blueprint.container.BeanRecipe.getType(BeanRecipe.java:895)
> 	at org.apache.aries.blueprint.container.BeanRecipe.getInstance(BeanRecipe.java:323)
> 	at org.apache.aries.blueprint.container.BeanRecipe.internalCreate2(BeanRecipe.java:806)
> 	at org.apache.aries.blueprint.container.BeanRecipe.internalCreate(BeanRecipe.java:787)
> 	at org.apache.aries.blueprint.di.AbstractRecipe$1.call(AbstractRecipe.java:79)
> 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> 	at org.apache.aries.blueprint.di.AbstractRecipe.create(AbstractRecipe.java:88)
> 	at org.apache.aries.blueprint.di.RefRecipe.internalCreate(RefRecipe.java:62)
> 	at org.apache.aries.blueprint.di.AbstractRecipe.create(AbstractRecipe.java:106)
> 	at org.apache.aries.blueprint.container.ServiceRecipe.createService(ServiceRecipe.java:282)
> 	at org.apache.aries.blueprint.container.ServiceRecipe.internalGetService(ServiceRecipe.java:249)
> 	at org.apache.aries.blueprint.container.ServiceRecipe.internalCreate(ServiceRecipe.java:146)
> 	at org.apache.aries.blueprint.di.AbstractRecipe$1.call(AbstractRecipe.java:79)
> 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> 	at org.apache.aries.blueprint.di.AbstractRecipe.create(AbstractRecipe.java:88)
> 	at org.apache.aries.blueprint.container.BlueprintRepository.createInstances(BlueprintRepository.java:245)
> 	at org.apache.aries.blueprint.container.BlueprintRepository.createAll(BlueprintRepository.java:183)
> 	at org.apache.aries.blueprint.container.BlueprintContainerImpl.instantiateEagerComponents(BlueprintContainerImpl.java:667)
> 	at org.apache.aries.blueprint.container.BlueprintContainerImpl.doRun(BlueprintContainerImpl.java:370)
> 	at org.apache.aries.blueprint.container.BlueprintContainerImpl.run(BlueprintContainerImpl.java:261)
> 	- locked <0x26a0b280> (a java.util.concurrent.atomic.AtomicBoolean)
> 	at org.apache.aries.blueprint.container.BlueprintExtender.createContainer(BlueprintExtender.java:265)
> 	at org.apache.aries.blueprint.container.BlueprintExtender.modifiedBundle(BlueprintExtender.java:228)
> 	at org.apache.aries.util.tracker.hook.BundleHookBundleTracker$Tracked.customizerModified(BundleHookBundleTracker.java:500)
> 	at org.apache.aries.util.tracker.hook.BundleHookBundleTracker$Tracked.customizerModified(BundleHookBundleTracker.java:433)
> 	at org.apache.aries.util.tracker.hook.BundleHookBundleTracker$AbstractTracked.track(BundleHookBundleTracker.java:725)
> 	at org.apache.aries.util.tracker.hook.BundleHookBundleTracker$Tracked.bundleChanged(BundleHookBundleTracker.java:463)
> 	at org.apache.aries.util.tracker.hook.BundleHookBundleTracker$BundleEventHook.event(BundleHookBundleTracker.java:422)
> 	at org.apache.felix.framework.util.SecureAction.invokeBundleEventHook(SecureAction.java:1103)
> 	at org.apache.felix.framework.util.EventDispatcher.createWhitelistFromHooks(EventDispatcher.java:696)
> 	at org.apache.felix.framework.util.EventDispatcher.fireBundleEvent(EventDispatcher.java:484)
> 	at org.apache.felix.framework.Felix.fireBundleEvent(Felix.java:4580)
> 	at org.apache.felix.framework.Felix$4.run(Felix.java:2115)
> 	at org.apache.felix.framework.Felix$5.run(Felix.java:2159)
> 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
> 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> 	at java.lang.Thread.run(Thread.java:662)
> "pool-org.fusesource.patch.patch-commands-7.2.0.redhat-012-thread-1" prio=6 tid=0x32f5fc00
nid=0x19fc waiting for monitor entry [0x3b4ce000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
> 	at java.lang.ClassLoader.checkCerts(ClassLoader.java:782)
> 	- waiting to lock <0x25e09390> (a org.apache.felix.framework.BundleWiringImpl$BundleClassLoaderJava5)
> 	at java.lang.ClassLoader.preDefineClass(ClassLoader.java:487)
> 	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:625)
> 	at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
> 	at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.findClass(BundleWiringImpl.java:2228)
> 	at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1472)
> 	at org.apache.felix.framework.BundleWiringImpl.access$400(BundleWiringImpl.java:75)
> 	at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1923)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> 	at org.apache.felix.framework.BundleWiringImpl.getClassByDelegation(BundleWiringImpl.java:1357)
> 	at org.apache.felix.framework.BundleWiringImpl.searchImports(BundleWiringImpl.java:1521)
> 	at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1467)
> 	at org.apache.felix.framework.BundleWiringImpl.access$400(BundleWiringImpl.java:75)
> 	at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1923)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> 	at org.apache.felix.framework.Felix.loadBundleClass(Felix.java:1862)
> 	at org.apache.felix.framework.BundleImpl.loadClass(BundleImpl.java:937)
> 	at org.apache.aries.blueprint.container.BlueprintContainerImpl.loadClass(BlueprintContainerImpl.java:419)
> 	at org.apache.aries.blueprint.container.GenericType.parse(GenericType.java:115)
> 	at org.apache.aries.blueprint.container.AbstractServiceReferenceRecipe.loadType(AbstractServiceReferenceRecipe.java:281)
> 	at org.apache.aries.blueprint.di.AbstractRecipe.loadClass(AbstractRecipe.java:149)
> 	at org.apache.aries.blueprint.container.AbstractServiceReferenceRecipe.getInterfaceClass(AbstractServiceReferenceRecipe.java:381)
> 	at org.apache.aries.blueprint.container.ReferenceRecipe.internalCreate(ReferenceRecipe.java:96)
> 	at org.apache.aries.blueprint.di.AbstractRecipe$1.call(AbstractRecipe.java:79)
> 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> 	at org.apache.aries.blueprint.di.AbstractRecipe.create(AbstractRecipe.java:88)
> 	at org.apache.aries.blueprint.di.RefRecipe.internalCreate(RefRecipe.java:62)
> 	at org.apache.aries.blueprint.di.AbstractRecipe.create(AbstractRecipe.java:106)
> 	at org.apache.aries.blueprint.container.BeanRecipe.setProperty(BeanRecipe.java:933)
> 	at org.apache.aries.blueprint.container.BeanRecipe.setProperties(BeanRecipe.java:907)
> 	at org.apache.aries.blueprint.container.BeanRecipe.setProperties(BeanRecipe.java:888)
> 	at org.apache.aries.blueprint.container.BeanRecipe.internalCreate2(BeanRecipe.java:820)
> 	at org.apache.aries.blueprint.container.BeanRecipe.internalCreate(BeanRecipe.java:787)
> 	at org.apache.aries.blueprint.di.AbstractRecipe$1.call(AbstractRecipe.java:79)
> 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> 	at org.apache.aries.blueprint.di.AbstractRecipe.create(AbstractRecipe.java:88)
> 	at org.apache.aries.blueprint.di.RefRecipe.internalCreate(RefRecipe.java:62)
> 	at org.apache.aries.blueprint.di.AbstractRecipe.create(AbstractRecipe.java:106)
> 	at org.apache.aries.blueprint.di.CollectionRecipe.internalCreate(CollectionRecipe.java:90)
> 	at org.apache.aries.blueprint.di.AbstractRecipe.create(AbstractRecipe.java:106)
> 	at org.apache.aries.blueprint.container.BeanRecipe.setProperty(BeanRecipe.java:933)
> 	at org.apache.aries.blueprint.container.BeanRecipe.setProperties(BeanRecipe.java:907)
> 	at org.apache.aries.blueprint.container.BeanRecipe.setProperties(BeanRecipe.java:888)
> 	at org.apache.aries.blueprint.container.BeanRecipe.internalCreate2(BeanRecipe.java:820)
> 	at org.apache.aries.blueprint.container.BeanRecipe.internalCreate(BeanRecipe.java:787)
> 	at org.apache.aries.blueprint.di.AbstractRecipe.create(AbstractRecipe.java:106)
> 	at org.apache.aries.blueprint.container.ServiceRecipe.createService(ServiceRecipe.java:282)
> 	at org.apache.aries.blueprint.container.ServiceRecipe.internalGetService(ServiceRecipe.java:249)
> 	at org.apache.aries.blueprint.container.ServiceRecipe.internalGetService(ServiceRecipe.java:236)
> 	at org.apache.aries.blueprint.container.ServiceRecipe.getClasses(ServiceRecipe.java:375)
> 	at org.apache.aries.blueprint.container.ServiceRecipe.register(ServiceRecipe.java:183)
> 	at org.apache.aries.blueprint.container.BlueprintContainerImpl.registerServices(BlueprintContainerImpl.java:689)
> 	at org.apache.aries.blueprint.container.BlueprintContainerImpl.doRun(BlueprintContainerImpl.java:369)
> 	at org.apache.aries.blueprint.container.BlueprintContainerImpl.run(BlueprintContainerImpl.java:261)
> 	- locked <0x2698d5b0> (a java.util.concurrent.atomic.AtomicBoolean)
> 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
> 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> 	at org.apache.aries.blueprint.container.ExecutorServiceWrapper.run(ExecutorServiceWrapper.java:106)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> 	at java.lang.Thread.run(Thread.java:662)
> {code}
> It may only happen with JDK 6 because the ClassLoader in JDK 6 is different and does
not support concurrent class loads.
> I'm not sure yet why this happen though.

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