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From "Filip Hanik (JIRA)" <j...@apache.org>
Subject [jira] Created: (DBCP-270) Dead lock using the evictor
Date Thu, 26 Jun 2008 17:19:45 GMT
Dead lock using the evictor
---------------------------

                 Key: DBCP-270
                 URL: https://issues.apache.org/jira/browse/DBCP-270
             Project: Commons Dbcp
          Issue Type: Bug
    Affects Versions: 1.2.2
            Reporter: Filip Hanik
            Priority: Critical


Patch attached, dead lock reported. the abandonedtrace does synchronized(this) when it really
only needs to do synchronized(this.trace)

Dead lock reported when using the evictor

=============================
"Timer-3":
  waiting to lock monitor 0x0000000053b40548 (object 0x00002aaabf3210f0, a
org.apache.tomcat.dbcp.dbcp.PoolableConnection),
  which is held by "TP-Processor27"
"TP-Processor27":
  waiting to lock monitor 0x0000000053b404d0 (object 0x00002aaab9fa8b08, a
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool),
  which is held by "Timer-3"

Java stack information for the threads listed above:
===================================================
"Timer-3":
        at
org.apache.tomcat.dbcp.dbcp.AbandonedTrace.addTrace(AbandonedTrace.java:175)
        - waiting to lock <0x00002aaabf3210f0> (a
org.apache.tomcat.dbcp.dbcp.PoolableConnection)
        at
org.apache.tomcat.dbcp.dbcp.AbandonedTrace.init(AbandonedTrace.java:92)
        at
org.apache.tomcat.dbcp.dbcp.AbandonedTrace.<init>(AbandonedTrace.java:82)
        at
org.apache.tomcat.dbcp.dbcp.DelegatingStatement.<init>(DelegatingStatement.java:61)
        at
org.apache.tomcat.dbcp.dbcp.DelegatingConnection.createStatement(DelegatingConnection.java:224)
        at
org.apache.tomcat.dbcp.dbcp.PoolableConnectionFactory.validateConnection(PoolableConnectionFactory.java:331)
        at
org.apache.tomcat.dbcp.dbcp.PoolableConnectionFactory.validateObject(PoolableConnectionFactory.java:312)
        at
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.evict(GenericObjectPool.java:1217)
        - locked <0x00002aaab9fa8b08> (a
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool)
        at
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool$Evictor.run(GenericObjectPool.java:1341)
        at java.util.TimerThread.mainLoop(Timer.java:512)
        at java.util.TimerThread.run(Timer.java:462)
"TP-Processor27":
        at
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.addObjectToPool(GenericObjectPool.java:1136)
        - waiting to lock <0x00002aaab9fa8b08> (a
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool)
        at
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.returnObject(GenericObjectPool.java:1076)
        at
org.apache.tomcat.dbcp.dbcp.PoolableConnection.close(PoolableConnection.java:87)
        - locked <0x00002aaabf3210f0> (a
org.apache.tomcat.dbcp.dbcp.PoolableConnection)
        ....

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