[ https://issues.apache.org/jira/browse/DERBY-2689?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Manish Khettry updated DERBY-2689:
----------------------------------

    Attachment: deadlock2.patch.txt

Revised patch. I cleaned up some of the spurious characters in the comments, moved setting of unusedActs=false to the top of the loop and reduced some whitespace diffs.


> Deadlock with GenericPreparedStatement
> --------------------------------------
>
>                 Key: DERBY-2689
>                 URL: https://issues.apache.org/jira/browse/DERBY-2689
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC
>    Affects Versions: 10.2.2.0
>         Environment: Windows
>            Reporter: Marc Ewert
>            Assignee: Manish Khettry
>            Priority: Critical
>         Attachments: deadlock.patch.txt, deadlock2.patch.txt, TestDerbyPreparedStatements.java
>
>
> We encountered two times a deadlock inside of derby. It seems that we can't workaround it. The involved two threads are attached, it looks like a classical deadlock:
> "Thread-22" daemon prio=6 tid=0x0cdaa400 nid=0x1c0 waiting for monitor entry [0x1317f000..0x1317fd4c]
>    java.lang.Thread.State: BLOCKED (on object monitor)
> 	at org.apache.derby.impl.sql.GenericPreparedStatement.finish(Unknown Source)
> 	- waiting to lock <0x052f4d70> (a org.apache.derby.impl.sql.GenericPreparedStatement)
> 	at org.apache.derby.impl.sql.execute.BaseActivation.close(Unknown Source)
> 	at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.addActivation(Unknown Source)
> 	at org.apache.derby.impl.sql.execute.BaseActivation.initFromContext(Unknown Source)
> 	at org.apache.derby.impl.services.reflect.LoadedGeneratedClass.newInstance(Unknown Source)
> 	at org.apache.derby.impl.services.reflect.ReflectGeneratedClass.newInstance(Unknown Source)
> 	at org.apache.derby.impl.sql.GenericActivationHolder.<init>(Unknown Source)
> 	at org.apache.derby.impl.sql.GenericPreparedStatement.getActivation(Unknown Source)
> 	- locked <0x05306f88> (a org.apache.derby.impl.sql.GenericPreparedStatement)
> 	at org.apache.derby.impl.jdbc.EmbedPreparedStatement.<init>(Unknown Source)
> 	at org.apache.derby.impl.jdbc.EmbedPreparedStatement20.<init>(Unknown Source)
> 	at org.apache.derby.impl.jdbc.EmbedPreparedStatement30.<init>(Unknown Source)
> 	at org.apache.derby.impl.jdbc.EmbedPreparedStatement40.<init>(Unknown Source)
> 	at org.apache.derby.jdbc.Driver40.newEmbedPreparedStatement(Unknown Source)
> 	at org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown Source)
> 	- locked <0x047beb00> (a org.apache.derby.impl.jdbc.EmbedConnection40)
> 	at org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown Source)
>         [custom methods]
> "ThreadPoolThread-SyncScheduler-3-1" prio=2 tid=0x0e620400 nid=0xfec waiting for monitor entry [0x10a7e000..0x10a7fa14]
>    java.lang.Thread.State: BLOCKED (on object monitor)
> 	at org.apache.derby.impl.sql.GenericPreparedStatement.finish(Unknown Source)
> 	- waiting to lock <0x05306f88> (a org.apache.derby.impl.sql.GenericPreparedStatement)
> 	at org.apache.derby.impl.sql.execute.BaseActivation.close(Unknown Source)
> 	at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.addActivation(Unknown Source)
> 	at org.apache.derby.impl.sql.execute.BaseActivation.initFromContext(Unknown Source)
> 	at org.apache.derby.impl.services.reflect.LoadedGeneratedClass.newInstance(Unknown Source)
> 	at org.apache.derby.impl.services.reflect.ReflectGeneratedClass.newInstance(Unknown Source)
> 	at org.apache.derby.impl.sql.GenericActivationHolder.<init>(Unknown Source)
> 	at org.apache.derby.impl.sql.GenericPreparedStatement.getActivation(Unknown Source)
> 	- locked <0x052f4d70> (a org.apache.derby.impl.sql.GenericPreparedStatement)
> 	at org.apache.derby.impl.jdbc.EmbedPreparedStatement.<init>(Unknown Source)
> 	at org.apache.derby.impl.jdbc.EmbedPreparedStatement20.<init>(Unknown Source)
> 	at org.apache.derby.impl.jdbc.EmbedPreparedStatement30.<init>(Unknown Source)
> 	at org.apache.derby.impl.jdbc.EmbedPreparedStatement40.<init>(Unknown Source)
> 	at org.apache.derby.jdbc.Driver40.newEmbedPreparedStatement(Unknown Source)
> 	at org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown Source)
> 	- locked <0x04225178> (a org.apache.derby.impl.jdbc.EmbedConnection40)
> 	at org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown Source)
>         [custom methods]

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