[jboss-jira] [JBoss JIRA] (WFLY-11036) Shutdown hangs if WAR is distributable and uses SSE

[Rich DiCroce (Jira)]

    [ https://issues.jboss.org/browse/WFLY-11036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13653923#comment-13653923 ] 

Rich DiCroce commented on WFLY-11036:
-------------------------------------

Here's a reproducer. Grab [^wfly-11036-0.0.1-SNAPSHOT.war] and drop it into your deployments directory. Start WildFly using the standalone-ha configuration.
* If you do nothing and just stop the server, it will shut down fine.
* If you open http://localhost:8080/wfly-11036-0.0.1-SNAPSHOT/ in a browser and then attempt to shut down the server, shut down will hang.
* If you open that page and then refresh the page, the request will hang for 15 seconds and then spam the log with lock timeout exceptions.

I can provide the source code for the reproducer (Eclipse/Maven project) if you want it.

> Shutdown hangs if WAR is distributable and uses SSE
> ---------------------------------------------------
>
>                 Key: WFLY-11036
>                 URL: https://issues.jboss.org/browse/WFLY-11036
>             Project: WildFly
>          Issue Type: Bug
>          Components: Clustering, Web (Undertow)
>    Affects Versions: 14.0.0.Final
>            Reporter: Rich DiCroce
>            Assignee: Paul Ferraro
>            Priority: Major
>         Attachments: wfly-11036-0.0.1-SNAPSHOT.war
>
>
> I have an application (WAR) that uses server-sent events (as standardized in JAX-RS 2.1). The application is also marked as <distributable/> in web.xml. If anything actually opens a SSE channel, WildFly hangs during shutdown.
> The culprit appears to be DistributableSessionManager. See the below thread dump, taken during a hung shutdown. DSM is coded to wait up to getDefaultMaxInactiveInterval() seconds in its stop() method, and the default is 30 minutes unless configured otherwise. That's why shutdown hangs, although I don't know what it's waiting for.
> If I remove <distributable/> from web.xml, shutdown happens normally.
> {code}
> "ServerService Thread Pool -- 45" #154 prio=5 os_prio=0 tid=0x000000002bc1a800 nid=0x115e8 waiting on condition [0x0000000035c5e000]
>    java.lang.Thread.State: TIMED_WAITING (parking)
>         at sun.misc.Unsafe.park(Native Method)
>         - parking to wait for  <0x00000000fb4bcc98> (a java.util.concurrent.locks.StampedLock)
>         at java.util.concurrent.locks.StampedLock.acquireWrite(StampedLock.java:1119)
>         at java.util.concurrent.locks.StampedLock.tryWriteLock(StampedLock.java:394)
>         at org.wildfly.clustering.web.undertow.session.DistributableSessionManager.stop(DistributableSessionManager.java:98)
>         - locked <0x00000000fb446c70> (a org.wildfly.clustering.web.undertow.session.DistributableSessionManager)
>         at io.undertow.servlet.core.DeploymentManagerImpl$3.call(DeploymentManagerImpl.java:617)
>         at io.undertow.servlet.core.DeploymentManagerImpl$3.call(DeploymentManagerImpl.java:607)
>         at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:42)
>         at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
>         at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1502)
>         at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction$$Lambda$920/1245185678.call(Unknown Source)
>         at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1502)
>         at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction$$Lambda$920/1245185678.call(Unknown Source)
>         at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1502)
>         at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction$$Lambda$920/1245185678.call(Unknown Source)
>         at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1502)
>         at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction$$Lambda$920/1245185678.call(Unknown Source)
>         at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1502)
>         at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction$$Lambda$920/1245185678.call(Unknown Source)
>         at io.undertow.servlet.core.DeploymentManagerImpl.stop(DeploymentManagerImpl.java:621)
>         at org.wildfly.extension.undertow.deployment.UndertowDeploymentService.stopContext(UndertowDeploymentService.java:135)
>         at org.wildfly.extension.undertow.deployment.UndertowDeploymentService$2.run(UndertowDeploymentService.java:117)
>         at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>         at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>         at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
>         at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1985)
>         at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1487)
>         at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1378)
>         at java.lang.Thread.run(Thread.java:748)
>         at org.jboss.threads.JBossThread.run(JBossThread.java:485)
>    Locked ownable synchronizers:
>         - None
> {code}



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