Deadlock in ManagedConnectionFactory
Issue
- Our JBoss server hangs and becomes unresponsive. From the thread dump, the root cause appears to be threads deadlocked calling Properties.equals() in ManagedConnectionFactory code, for example:
"http-0.0.0.0-8080-1": at java.util.Hashtable.size(Hashtable.java:206) - waiting to lock <0x0000000779ebe9c0> (a java.util.Properties) at java.util.Hashtable.equals(Hashtable.java:742) - locked <0x0000000779ea2ff8> (a java.util.Properties) at org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory.equals(XAManagedConnectionFactory.java:524) at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnectionFactory$SubjectActions.run(BaseWrapperManagedConnectionFactory.java:640) at java.security.AccessController.doPrivileged(Native Method) at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnectionFactory$SubjectActions.addMatchingProperties(BaseWrapperManagedConnectionFactory.java:655) at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnectionFactory.getConnectionProperties(BaseWrapperManagedConnectionFactory.java:504) - locked <0x0000000779fccef0> (a org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory) at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnection.checkIdentity(BaseWrapperManagedConnection.java:522) at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnection.getConnection(BaseWrapperManagedConnection.java:283) at org.jboss.resource.connectionmanager.BaseConnectionManager2.allocateConnection(BaseConnectionManager2.java:505) at org.jboss.resource.connectionmanager.BaseConnectionManager2$ConnectionManagerProxy.allocateConnection(BaseConnectionManager2.java:941) at org.jboss.resource.adapter.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:89) ... "JCA PoolFiller": at java.util.Hashtable.get(Hashtable.java:333) - waiting to lock <0x0000000779ea2ff8> (a java.util.Properties) at java.util.Hashtable.equals(Hashtable.java:755) - locked <0x0000000779ebe9c0> (a java.util.Properties) at org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory.equals(XAManagedConnectionFactory.java:524) at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnectionFactory$SubjectActions.run(BaseWrapperManagedConnectionFactory.java:640) at java.security.AccessController.doPrivileged(Native Method) at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnectionFactory$SubjectActions.addMatchingProperties(BaseWrapperManagedConnectionFactory.java:655) at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnectionFactory.getConnectionProperties(BaseWrapperManagedConnectionFactory.java:504) - locked <0x0000000779ce3178> (a org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory) at org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory.getXAManagedConnection(XAManagedConnectionFactory.java:443) at org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory.createManagedConnection(XAManagedConnectionFactory.java:409) - locked <0x0000000779ce3178> (a org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory) at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.createConnectionEventListener(InternalManagedConnectionPool.java:639) at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.fillToMin(InternalManagedConnectionPool.java:547) at org.jboss.resource.connectionmanager.PoolFiller.run(PoolFiller.java:74) at java.lang.Thread.run(Thread.java:662
Environment
- JBoss Enterprise Application Platform (EAP) 5.1.2 and earlier
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