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

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: Stefano Maestri 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}