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https://issues.apache.org/jira/browse/POOL-381?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gary D. Gregory moved IO-647 to POOL-381:
-----------------------------------------
Key: POOL-381 (was: IO-647)
Affects Version/s: (was: 2.1)
2.1
Workflow: classic default workflow (was: Default workflow,
editable Closed status)
Project: Commons Pool (was: Commons IO)
> Race condition in the GenericObjectPool in removeAbandoned functionality
> ------------------------------------------------------------------------
>
> Key: POOL-381
> URL: https://issues.apache.org/jira/browse/POOL-381
> Project: Commons Pool
> Issue Type: Bug
> Affects Versions: 2.1
> Reporter: Daniel Dudziak
> Priority: Minor
>
> Hello,
> today I found out a potential issue around GenericObjectPool and removing
> "abandoned" objects functionality.
> During the accident one of our customers faced with database outage.
> After this our product become unreachable. This state was caused by two
> threads.
> 1st "survived" the outage and still possessing the connection it operates on
> the database,
> 2nd one was forced to remove "abandoned" objects.
> This situation cause that 2nd thread was waiting for 1st one until this 1st
> thread end his database operation.
> More context can be found in the stack traces attached below.
> {code:java}
> "1st thread" #434 daemon prio=5 os_prio=0 tid=0x00007f9e7746f000 nid=0x9680
> runnable [0x00007f9d29c70000]"1st thread" #434 daemon prio=5 os_prio=0
> tid=0x00007f9e7746f000 nid=0x9680 runnable [0x00007f9d29c70000]
> java.lang.Thread.State: RUNNABLE
> at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
> at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
> at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
> at sun.nio.ch.IOUtil.read(IOUtil.java:197)
> at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
> - locked <0x00007fa23958bc48> (a java.lang.Object)
> at
> oracle.net.nt.TimeoutSocketChannel.read(TimeoutSocketChannel.java:144)
> at oracle.net.ns.NIOHeader.readHeaderBuffer(NIOHeader.java:82)
> at oracle.net.ns.NIOPacket.readFromSocketChannel(NIOPacket.java:139)
> at oracle.net.ns.NIOPacket.readFromSocketChannel(NIOPacket.java:101)
> at
> oracle.net.ns.NIONSDataChannel.readDataFromSocketChannel(NIONSDataChannel.java:80)
> at
> oracle.jdbc.driver.T4CMAREngineNIO.prepareForReading(T4CMAREngineNIO.java:102)
> at
> oracle.jdbc.driver.T4CMAREngineNIO.getNBytes(T4CMAREngineNIO.java:679)
> at
> oracle.jdbc.driver.T4CMAREngineNIO.unmarshalNBytes(T4CMAREngineNIO.java:651)
> at
> oracle.jdbc.driver.DynamicByteArray.unmarshalBuffer(DynamicByteArray.java:334)
> at
> oracle.jdbc.driver.DynamicByteArray.unmarshalCLR(DynamicByteArray.java:226)
> at
> oracle.jdbc.driver.T4CNumberAccessor.unmarshalBytes(T4CNumberAccessor.java:191)
> at
> oracle.jdbc.driver.T4CNumberAccessor.unmarshalOneRow(T4CNumberAccessor.java:173)
> at oracle.jdbc.driver.T4CTTIrxd.unmarshal(T4CTTIrxd.java:1526)
> at oracle.jdbc.driver.T4CTTIrxd.unmarshal(T4CTTIrxd.java:1289)
> at oracle.jdbc.driver.T4C8Oall.readRXD(T4C8Oall.java:850)
> at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:543)
> at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:252)
> at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:612)
> at
> oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:226)
> at
> oracle.jdbc.driver.T4CPreparedStatement.fetch(T4CPreparedStatement.java:1023)
> at
> oracle.jdbc.driver.OracleStatement.fetchMoreRows(OracleStatement.java:3353)
> at
> oracle.jdbc.driver.InsensitiveScrollableResultSet.fetchMoreRows(InsensitiveScrollableResultSet.java:736)
> at
> oracle.jdbc.driver.InsensitiveScrollableResultSet.absoluteInternal(InsensitiveScrollableResultSet.java:692)
> at
> oracle.jdbc.driver.InsensitiveScrollableResultSet.next(InsensitiveScrollableResultSet.java:406)
> - locked <0x00007fa23958e580> (a oracle.jdbc.driver.T4CConnection)
> at
> org.apache.commons.dbcp2.DelegatingResultSet.next(DelegatingResultSet.java:191)
> at
> org.apache.commons.dbcp2.DelegatingResultSet.next(DelegatingResultSet.java:191)
> {code}
> {code:java}
> "2nd thread" #376448 daemon prio=5 os_prio=0 tid=0x00007f9e581db000
> nid=0x1239 waiting for monitor entry [0x00007f9a75ff2000]"2nd thread" #376448
> daemon prio=5 os_prio=0 tid=0x00007f9e581db000 nid=0x1239 waiting for monitor
> entry [0x00007f9a75ff2000] java.lang.Thread.State: BLOCKED (on object
> monitor) at
> oracle.jdbc.driver.InsensitiveScrollableResultSet.close(InsensitiveScrollableResultSet.java:190)
> - waiting to lock <0x00007fa23958e580> at
> org.apache.commons.dbcp2.DelegatingResultSet.close(DelegatingResultSet.java:170)
> at
> org.apache.commons.dbcp2.DelegatingStatement.close(DelegatingStatement.java:150)
> at
> org.apache.commons.dbcp2.DelegatingConnection.passivate(DelegatingConnection.java:631)
> at
> org.apache.commons.dbcp2.PoolableConnection.passivate(PoolableConnection.java:127)
> at
> org.apache.commons.dbcp2.DelegatingConnection.closeInternal(DelegatingConnection.java:232)
> at
> org.apache.commons.dbcp2.PoolableConnection.reallyClose(PoolableConnection.java:243)
> at
> org.apache.commons.dbcp2.PoolableConnectionFactory.destroyObject(PoolableConnectionFactory.java:334)
> at
> org.apache.commons.pool2.impl.GenericObjectPool.destroy(GenericObjectPool.java:890)
> at
> org.apache.commons.pool2.impl.GenericObjectPool.invalidateObject(GenericObjectPool.java:649)
> - locked <0x00007fa2651f85f8> (a
> org.apache.commons.pool2.impl.DefaultPooledObject)
> at
> org.apache.commons.pool2.impl.GenericObjectPool.removeAbandoned(GenericObjectPool.java:1022)
> at
> org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:418)
> at
> org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:363)
> at
> org.apache.commons.dbcp2.PoolingDataSource.getConnection(PoolingDataSource.java:134)
> at
> org.apache.commons.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1533)
> {code}
> Cheers,
> Daniel Dudziak
> Atlassian Developer
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