[jboss-jira] [JBoss JIRA] (WFLY-11678) ManagedExecutorService persists contextClassLoader reference to cause app classloader leaks

[Eduardo Martins (Jira)]

    [ https://issues.jboss.org/browse/WFLY-11678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13698532#comment-13698532 ] 

Eduardo Martins commented on WFLY-11678:
----------------------------------------

The issue could be prevented through managed executor service config, but we may enforce that managed threads are never created with app CL in context, and that's the goal of linked PR. 

> ManagedExecutorService persists contextClassLoader reference to cause app classloader leaks
> -------------------------------------------------------------------------------------------
>
>                 Key: WFLY-11678
>                 URL: https://issues.jboss.org/browse/WFLY-11678
>             Project: WildFly
>          Issue Type: Bug
>          Components: Concurrency Utilities
>         Environment: -- EAP 7.1.4
>            Reporter: Lei Yu
>            Assignee: James Perkins
>            Priority: Critical
>             Fix For: 16.0.0.CR1
>
>
> managed executor:
> {code}
> <managed-executor-services>
>     <managed-executor-service name="default" jndi-name="java:jboss/ee/concurrency/executor/default" context-service="default" hung-task-threshold="60000" keepalive-time="5000"/>
> </managed-executor-services>
> {code}
> With each undeploy, the application classloader is leaked and not released because contextClassLoader references persisted on the executor threads:
> {code}
> Class Name                                                                                                                                          | Ref. Objects | Shallow Heap | Ref. Shallow Heap | Retained Heap
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> org.jboss.as.ee.concurrent.service.ElytronManagedThreadFactory$ElytronManagedThread @ 0xc3677570  EE-ManagedExecutorService-default-Thread-13 Thread|            1 |          160 |                88 |         1,344
> '- contextClassLoader org.jboss.modules.ModuleClassLoader @ 0xc32b9d98                                                                              |            1 |           88 |                88 |       366,800
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> {code}
> Tracing with byteman, what's strange is that it sets the app classloader on setup:
> {code}
> Thread.setContextClassLoader: Thread[EE-ManagedExecutorService-default-Thread-16,5,ServerService ThreadGroup] ModuleClassLoader for Module "deployment.services-1.0.4-rc1.war" from Service Module Loader
> java.lang.Thread.setContextClassLoader(Thread.java:1477)
> org.wildfly.security.manager.WildFlySecurityManager.setCurrentContextClassLoaderPrivileged(WildFlySecurityManager.java:1272)
> org.jboss.as.ee.concurrent.handle.ClassLoaderContextHandleFactory$ClassLoaderSetupContextHandle.setup(ClassLoaderContextHandleFactory.java:83)
> org.jboss.as.ee.concurrent.ConcurrentContext$ChainedSetupContextHandle.setup(ConcurrentContext.java:166)
> org.jboss.as.ee.concurrent.DefaultContextSetupProviderImpl.setup(DefaultContextSetupProviderImpl.java:58)
> org.glassfish.enterprise.concurrent.internal.ManagedFutureTask.setupContext(ManagedFutureTask.java:121)
> org.glassfish.enterprise.concurrent.internal.ManagedThreadPoolExecutor.beforeExecute(ManagedThreadPoolExecutor.java:109)
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> java.lang.Thread.run(Thread.java:748)
> {code}
> And still sets that app classloader after task execution in the reset:
> {code}
> Thread.setContextClassLoader: Thread[EE-ManagedExecutorService-default-Thread-16,5,ServerService ThreadGroup] ModuleClassLoader for Module "deployment.services-1.0.4-rc1.war" from Service Module Loader
> java.lang.Thread.setContextClassLoader(Thread.java:1477)
> org.wildfly.security.manager.WildFlySecurityManager.setCurrentContextClassLoaderPrivileged(WildFlySecurityManager.java:1272)
> org.jboss.as.ee.concurrent.handle.ClassLoaderContextHandleFactory$ClassLoaderResetContextHandle.reset(ClassLoaderContextHandleFactory.java:113)
> org.jboss.as.ee.concurrent.ConcurrentContext$ChainedResetContextHandle.reset(ConcurrentContext.java:284)
> org.jboss.as.ee.concurrent.DefaultContextSetupProviderImpl.reset(DefaultContextSetupProviderImpl.java:63)
> org.glassfish.enterprise.concurrent.internal.ManagedFutureTask.resetContext(ManagedFutureTask.java:134)
> org.glassfish.enterprise.concurrent.internal.ManagedThreadPoolExecutor.afterExecute(ManagedThreadPoolExecutor.java:90)
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1157)
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> java.lang.Thread.run(Thread.java:748)
> {code}
> So the thread is sitting in the pool with the app classloader.  Is there some way we should be able to get the context loader cleared or unset from the app loader in the reset?



--
This message was sent by Atlassian Jira
(v7.12.1#712002)