[jboss-jira] [JBoss JIRA] (WFLY-3549) Deadlock during shutdown

[Dan Berindei (JIRA)]

Dan Berindei created WFLY-3549:
----------------------------------

             Summary: Deadlock during shutdown
                 Key: WFLY-3549
                 URL: https://issues.jboss.org/browse/WFLY-3549
             Project: WildFly
          Issue Type: Bug
      Security Level: Public (Everyone can see)
    Affects Versions: 8.1.0.Final
            Reporter: Dan Berindei
            Assignee: Jason Greene


This deadlock appeared in an Arquillian test:

{noformat}
Found one Java-level deadlock:
=============================
"undefined":
  waiting to lock monitor 0x00007f67a421bfa8 (object 0x00000000e0700480, a org.jboss.as.threads.ScheduledThreadPoolService),
  which is held by "MSC service thread 1-2"
"MSC service thread 1-2":
  waiting for ownable synchronizer 0x00000000e0700618, (a java.util.concurrent.locks.ReentrantLock$NonfairSync),
  which is held by "undefined"

Java stack information for the threads listed above:
===================================================
"undefined":
	at org.jboss.as.threads.ScheduledThreadPoolService$ExecutorImpl.terminated(ScheduledThreadPoolService.java:121)
	- waiting to lock <0x00000000e0700480> (a org.jboss.as.threads.ScheduledThreadPoolService)
	at java.util.concurrent.ThreadPoolExecutor.tryTerminate(ThreadPoolExecutor.java:704)
	at java.util.concurrent.ThreadPoolExecutor.processWorkerExit(ThreadPoolExecutor.java:1006)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1163)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:724)
	at org.jboss.threads.JBossThread.run(JBossThread.java:122)
"MSC service thread 1-2":
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000e0700618> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:867)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1197)
	at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:214)
	at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:290)
	at java.util.concurrent.ThreadPoolExecutor.interruptIdleWorkers(ThreadPoolExecutor.java:781)
	at java.util.concurrent.ThreadPoolExecutor.tryTerminate(ThreadPoolExecutor.java:695)
	at java.util.concurrent.ThreadPoolExecutor.shutdown(ThreadPoolExecutor.java:1397)
	at java.util.concurrent.ScheduledThreadPoolExecutor.shutdown(ScheduledThreadPoolExecutor.java:759)
	at org.jboss.as.threads.ManagedScheduledExecutorService.internalShutdown(ManagedScheduledExecutorService.java:53)
	at org.jboss.as.threads.ScheduledThreadPoolService.stop(ScheduledThreadPoolService.java:67)
	- locked <0x00000000e0700480> (a org.jboss.as.threads.ScheduledThreadPoolService)
	at org.jboss.msc.service.ServiceControllerImpl$StopTask.stopService(ServiceControllerImpl.java:2056)
	at org.jboss.msc.service.ServiceControllerImpl$StopTask.run(ServiceControllerImpl.java:2017)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:724)

Found 1 deadlock.
{noformat}

Looks like two MSC service threads exited and tried to terminate the thread pool at the same time. And because the MSC threads are not daemon threads, the entire JVM hangs and blocks the Arquillian test that was waiting for the container to shut down.



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