[jboss-jira] [JBoss JIRA] (WFLY-10000) Wildfly shutdown deadlock with active websocket session

[Marcel Šebek (JIRA)]

Marcel Šebek created WFLY-10000:
-----------------------------------

             Summary: Wildfly shutdown deadlock with active websocket session
                 Key: WFLY-10000
                 URL: https://issues.jboss.org/browse/WFLY-10000
             Project: WildFly
          Issue Type: Bug
          Components: Web Sockets
    Affects Versions: 12.0.0.Final
         Environment: Linux - debian stretch (stable), openjdk 8.
            Reporter: Marcel Šebek
            Assignee: Stuart Douglas


Wildfly hangs during shutdown if a websocket session is active. @OnClose callback is called, but after that, wildfly hangs forever. Thread dump shows that two threads are in BLOCKED state:

{noformat}
"default task-7" #429 prio=5 os_prio=0 tid=0x00005609dcd78800 nid=0x4bf6 waiting for monitor entry [0x00007fadc61bd000]
   java.lang.Thread.State: BLOCKED (on object monitor)
        at io.undertow.websockets.jsr.ServerWebSocketContainer$10.run(ServerWebSocketContainer.java:892)
        - waiting to lock <0x00000000f5fad4e0> (a io.undertow.websockets.jsr.ServerWebSocketContainer)
        - locked <0x00000000f0f7edf8> (a io.undertow.websockets.jsr.ServerWebSocketContainer$10)
        at io.undertow.websockets.jsr.SessionContainer.removeOpenSession(SessionContainer.java:52)
        - locked <0x00000000f5fad5a0> (a io.undertow.websockets.jsr.ConfiguredServerEndpoint)
        at io.undertow.websockets.jsr.UndertowSession$2.run(UndertowSession.java:370)
        at io.undertow.websockets.jsr.OrderedExecutor$ExecutorTask.run(OrderedExecutor.java:67)
        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)

   Locked ownable synchronizers:
        - None          

"ServerService Thread Pool -- 50" #82 prio=5 os_prio=0 tid=0x00005609d81f1000 nid=0x48e8 waiting for monitor entry [0x00007fade862d000]
   java.lang.Thread.State: BLOCKED (on object monitor)
        at java.lang.Object.wait(Native Method)
        at io.undertow.websockets.jsr.SessionContainer.awaitClose(SessionContainer.java:67)
        - locked <0x00000000f5fad5a0> (a io.undertow.websockets.jsr.ConfiguredServerEndpoint)
        at io.undertow.websockets.jsr.ServerWebSocketContainer.close(ServerWebSocketContainer.java:779)
        - locked <0x00000000f5fad4e0> (a io.undertow.websockets.jsr.ServerWebSocketContainer)
        at io.undertow.websockets.jsr.ServerWebSocketContainer.close(ServerWebSocketContainer.java:784)
        - locked <0x00000000f5fad4e0> (a io.undertow.websockets.jsr.ServerWebSocketContainer)
        at io.undertow.websockets.jsr.Bootstrap$WebSocketListener.contextDestroyed(Bootstrap.java:128)
        at io.undertow.servlet.core.ApplicationListeners.contextDestroyed(ApplicationListeners.java:202)
        at io.undertow.servlet.core.DeploymentImpl.destroy(DeploymentImpl.java:252)
        at io.undertow.servlet.core.DeploymentManagerImpl$4.call(DeploymentManagerImpl.java:663)
        at io.undertow.servlet.core.DeploymentManagerImpl$4.call(DeploymentManagerImpl.java:660)
        at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:42)
        at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
        at org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create$0(SecurityContextThreadSetupAction.java:105)
        at org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction$$Lambda$1145/655479276.call(Unknown Source)
        at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1526)
        at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction$$Lambda$1146/915737155.call(Unknown Source)
        at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1526)
        at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction$$Lambda$1146/915737155.call(Unknown Source)
        at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1526)
        at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction$$Lambda$1146/915737155.call(Unknown Source)
        at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1526)
        at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction$$Lambda$1146/915737155.call(Unknown Source)
        at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1526)
        at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction$$Lambda$1146/915737155.call(Unknown Source)
        at io.undertow.servlet.core.DeploymentManagerImpl.undeploy(DeploymentManagerImpl.java:668)
        at org.wildfly.extension.undertow.deployment.UndertowDeploymentService.stopContext(UndertowDeploymentService.java:139)
        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   
{noformat}

There may be some other necessary conditions necessary to reproduce the issue (specific wildfly configuration, some application setup). If the issue is not clear from the thread dump, I can create some small example reproducing the problem.



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