[jboss-jira] [JBoss JIRA] (WFLY-3549) Deadlock during shutdown
Dan Berindei created WFLY-3549:
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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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