[jboss-jira] [JBoss JIRA] (WFLY-9982) Sometimes BootstrapImpl$ShutdownHook does not finish and holds server shutdown

[Miroslav Novak (JIRA)]

Miroslav Novak created WFLY-9982:
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             Summary: Sometimes BootstrapImpl$ShutdownHook does not finish and holds server shutdown
                 Key: WFLY-9982
                 URL: https://issues.jboss.org/browse/WFLY-9982
             Project: WildFly
          Issue Type: Bug
          Components: Server
    Affects Versions: 12.0.0.Final
            Reporter: Miroslav Novak
            Assignee: Jason Greene


There is intermittent failure where server does not stop and hangs during clean shutdown. 

Investigation:

In attached thread dump there is shutdown of WF/EAP JVM thread waiting for finishing org.jboss.as.server.BootstrapImpl$ShutdownHook:
{code}
"Management Triggered Shutdown" #262 prio=5 os_prio=0 tid=0x00007f931c03b800 nid=0x3900 in Object.wait() [0x00007f9296423000]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x00000000cf059e98> (a org.jboss.as.server.BootstrapImpl$ShutdownHook)
        at java.lang.Thread.join(Thread.java:1252)
        - locked <0x00000000cf059e98> (a org.jboss.as.server.BootstrapImpl$ShutdownHook)
        at java.lang.Thread.join(Thread.java:1326)
        at java.lang.ApplicationShutdownHooks.runHooks(ApplicationShutdownHooks.java:106)
        at java.lang.ApplicationShutdownHooks$1.run(ApplicationShutdownHooks.java:46)
        at java.lang.Shutdown.runHooks(Shutdown.java:123)
        at java.lang.Shutdown.sequence(Shutdown.java:167)
        at java.lang.Shutdown.exit(Shutdown.java:212)
        - locked <0x00000000cedfac08> (a java.lang.Class for java.lang.Shutdown)
        at java.lang.Runtime.exit(Runtime.java:109)
        at java.lang.System.exit(System.java:971)
        at org.jboss.as.server.SystemExiter$DefaultExiter.exit(SystemExiter.java:117)
        at org.jboss.as.server.SystemExiter.logAndExit(SystemExiter.java:98)
        at org.jboss.as.server.operations.ServerShutdownHandler$ShutdownAction$1.run(ServerShutdownHandler.java:184)
        at java.lang.Thread.run(Thread.java:748)
{code}

which hangs in:
{code}
"Thread-3" #12 prio=5 os_prio=0 tid=0x00007f92d01dc800 nid=0x3902 waiting on condition [0x00007f9296221000]
   java.lang.Thread.State: WAITING (parking)
        at sun.misc.Unsafe.park(Native Method)
        - parking to wait for  <0x00000000fc2531d8> (a java.util.concurrent.CountDownLatch$Sync)
        at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
        at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
        at org.jboss.as.server.BootstrapImpl$ShutdownHook.shutdown(BootstrapImpl.java:276)
        at org.jboss.as.server.BootstrapImpl$ShutdownHook.run(BootstrapImpl.java:240)
{code}

where ShutdownHook.shutdown(BootstrapImpl.java:276) is waiting for latch to count down however this does not happen. It seems like that not all services shut down.  



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