[jboss-jira] [JBoss JIRA] (WFLY-6989) Java deadlock with IdleRemover thread

[David Rothenberger (JIRA)]

David Rothenberger created WFLY-6989:
----------------------------------------

             Summary: Java deadlock with IdleRemover thread
                 Key: WFLY-6989
                 URL: https://issues.jboss.org/browse/WFLY-6989
             Project: WildFly
          Issue Type: Bug
          Components: JCA
    Affects Versions: 10.0.0.Final
         Environment: Java 8 b102 64-bit on Linux

Using Oracle 12.c with Oracle thin client drivers.

            Reporter: David Rothenberger
            Assignee: Jesper Pedersen


We have had two Java deadlock issues involving the IdleRemover thread.

We are using the following datasource definition:
Data source definition:
{code:xml}
<datasource jndi-name="java:/EntomoNonTxDS" pool-name="EntomoNonTxDS" enabled="true" use-java-context="true">
    <connection-url>jdbc:oracle:thin:@//somehost:1541/somethingelse</connection-url>
    <driver>ojdbc6.jar</driver>
    <pool>
        <max-pool-size>200</max-pool-size>
        <allow-multiple-users>true</allow-multiple-users>
    </pool>
    <timeout>
        <idle-timeout-minutes>5</idle-timeout-minutes>
    </timeout>
    <validation>
        <validate-on-match>true</validate-on-match>
        <valid-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.oracle.OracleValidConnectionChecker"/>
        <stale-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.oracle.OracleStaleConnectionChecker"/>
        <exception-sorter class-name="org.jboss.jca.adapters.jdbc.extensions.oracle.OracleExceptionSorter"/>
    </validation>
</datasource>
{code}

The information from Java relevant to the deadlock:
{noformat}
Found one Java-level deadlock:
=============================
"WorkflowMgr":
  waiting for ownable synchronizer 0x00000002d37eb7f0, (a java.util.concurrent.locks.ReentrantLock$FairSync),
  which is held by "IdleRemover"
"IdleRemover":
  waiting to lock monitor 0x00007eff4c0a80e8 (object 0x00000002d280e6f0, a org.jboss.jca.core.connectionmanager.pool.strategy.PoolByCri),
  which is held by "WorkflowMgr"

"WorkflowMgr":
        at sun.misc.Unsafe.park(Native Method)
        - parking to wait for  <0x00000002d37eb7f0> (a java.util.concurrent.locks.ReentrantLock$FairSync)
        at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:870)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199)
        at java.util.concurrent.locks.ReentrantLock$FairSync.lock(ReentrantLock.java:224)
        at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285)
        at org.jboss.jca.core.connectionmanager.pool.idle.IdleRemover.internalRegisterPool(IdleRemover.java:184)
        at org.jboss.jca.core.connectionmanager.pool.idle.IdleRemover.registerPool(IdleRemover.java:166)
        at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreConcurrentLinkedDequeManagedConnectionPool.initialize(SemaphoreConcurrentLinkedDequeManagedConnectionPool.java:184)
        at org.jboss.jca.core.connectionmanager.pool.mcp.ManagedConnectionPoolFactory.init(ManagedConnectionPoolFactory.java:191)
        at org.jboss.jca.core.connectionmanager.pool.mcp.ManagedConnectionPoolFactory.create(ManagedConnectionPoolFactory.java:173)
        at org.jboss.jca.core.connectionmanager.pool.AbstractPool.getManagedConnectionPool(AbstractPool.java:306)
        - locked <0x00000002d280e6f0> (a org.jboss.jca.core.connectionmanager.pool.strategy.PoolByCri)
        at org.jboss.jca.core.connectionmanager.pool.AbstractPool.getConnection(AbstractPool.java:590)
        at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.getManagedConnection(AbstractConnectionManager.java:590)
        at org.jboss.jca.core.connectionmanager.tx.TxConnectionManagerImpl.getManagedConnection(TxConnectionManagerImpl.java:429)
        at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.allocateConnection(AbstractConnectionManager.java:747)
        at org.jboss.jca.adapters.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:162)
        at org.jboss.as.connector.subsystems.datasources.WildFlyDataSource.getConnection(WildFlyDataSource.java:73)
...
"IdleRemover":
        at org.jboss.jca.core.connectionmanager.pool.AbstractPool.emptyManagedConnectionPool(AbstractPool.java:454)
        - waiting to lock <0x00000002d280e6f0> (a org.jboss.jca.core.connectionmanager.pool.strategy.PoolByCri)
        at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreConcurrentLinkedDequeManagedConnectionPool.removeIdleConnections(SemaphoreConcurrentLinkedDequeManagedConnectionPool.java:1034)
        at org.jboss.jca.core.connectionmanager.pool.idle.IdleRemover$IdleRemoverRunner.run(IdleRemover.java:275)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
{noformat}



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