Deadlock in ManagedConnectionFactory

Solution Verified - Updated

Environment

  • JBoss Enterprise Application Platform (EAP) 5.1.2 and earlier

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

Resolution

  • Upgrade to EAP 5.2.0

Root Cause

Diagnostic Steps

SBR
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