Thread deadlock due to CacheModel.flush()
-----------------------------------------
Key: IBATIS-223
URL: http://issues.apache.org/jira/browse/IBATIS-223
Project: iBatis for Java
Type: Bug
Components: SQL Maps
Versions: 2.1.5
Environment: Redhat Linux ES 3.0 + Weblogic 8.1SP4+iBatis 2.1.5 + OSCache 2.2
+ JGroups 2.2.8
Reporter: Vincent Royer
As shown by the following thread dump, a deadlock occurs between thead 7 and
10. As the result, almost all theads were locked due to this deadlock.
It seems that thread 10 locks the [EMAIL PROTECTED] object in
CacheModel.getObject() then is locked on [EMAIL PROTECTED] in
CacheModel.flush(). In the same time, thread 7 locks [EMAIL PROTECTED] in
CachingStatement.executeQueryForList(), then is lock on [EMAIL PROTECTED] when
calling CacheModel.getLockKey() from CacheModel.putObject().
Of course, such deadlock occur when 2 threads work with the same cached object
and when this object is often flushed.
Thread-0xc00 "ExecuteThread: '10' for queue: 'ExecutionAsynchroneThreadQueue'"
<Active, priority=5, DAEMON> {
java/util/HashMap.get(Ljava/lang/Object;)Ljava/lang/Object;(Optimized
Method)
com/ibatis/sqlmap/engine/cache/CacheModel.getObject(Lcom/ibatis/sqlmap/engine/cache/CacheKey;)Ljava/lang/Object;(Optimized
Method)
^-- Holding lock: com/ibatis/sqlmap/engine/cache/[EMAIL PROTECTED] lock]
com/ibatis/sqlmap/engine/mapping/statement/CachingStatement.executeQueryForList(Lcom/ibatis/sqlmap/engine/scope/RequestScope;Lcom/ibatis/s
qlmap/engine/transaction/Transaction;Ljava/lang/Object;II)Ljava/util/List;(Optimized
Method)
com/ibatis/sqlmap/engine/impl/SqlMapSessionImpl.queryForList(Ljava/lang/String;Ljava/lang/Object;)Ljava/util/List;(Optimized
Method)
cofidis/fwk/ancestor/DaoAncestor$3.executeSqlAction(Lcom/ibatis/sqlmap/client/SqlMapSession;)Ljava/lang/Object;(Optimized
Method)
....
Thread-0xa80 "ExecuteThread: '7' for queue: 'ExecutionAsynchroneThreadQueue'"
<Active, priority=5, DAEMON> {
-- Blocked trying to get lock: com/ibatis/sqlmap/engine/cache/[EMAIL
PROTECTED] lock]
jrockit/vm/Threads.shortNap(I)V(Native Method)
jrockit/vm/Locks.waitForThinRelease(Ljava/lang/Object;I)I(Optimized Method)
jrockit/vm/Locks.monitorEnterSecondStage(Ljava/lang/Object;I)Ljava/lang/Object;(Optimized
Method)
jrockit/vm/Locks.monitorEnter(Ljava/lang/Object;)Ljava/lang/Object;(Native
Method)
com/ibatis/sqlmap/engine/cache/CacheModel.getLock(Lcom/ibatis/sqlmap/engine/cache/CacheKey;)Ljava/lang/Object;(CacheModel.java:324)
com/ibatis/sqlmap/engine/cache/CacheModel.putObject(Lcom/ibatis/sqlmap/engine/cache/CacheKey;Ljava/lang/Object;)V(CacheModel.java:313)
com/ibatis/sqlmap/engine/mapping/statement/CachingStatement.executeQueryForList(Lcom/ibatis/sqlmap/engine/scope/RequestScope;Lcom/ibatis/s
qlmap/engine/transaction/Transaction;Ljava/lang/Object;II)Ljava/util/List;(Optimized
Method)
^-- Holding lock: java/lang/[EMAIL PROTECTED] lock]
com/ibatis/sqlmap/engine/impl/SqlMapSessionImpl.queryForList(Ljava/lang/String;Ljava/lang/Object;)Ljava/util/List;(Optimized
Method)
cofidis/fwk/ancestor/DaoAncestor$3.executeSqlAction(Lcom/ibatis/sqlmap/client/SqlMapSession;)Ljava/lang/Object;(Optimized
Method)
cofidis/fwk/ancestor/DaoAncestor.execute(Lcofidis/fwk/ancestor/DaoAncestor$DaoCallback;)Ljava/lang/Object;(Optimized
Method)
cofidis/fwk/ancestor/DaoAncestor.executeWithListResult(Lcofidis/fwk/ancestor/DaoAncestor$DaoCallback;)Ljava/util/List;(Optimized
Method)
cofidis/fwk/ancestor/DaoAncestor.queryForList(Ljava/lang/String;Ljava/lang/Object;)Ljava/util/List;(Optimized
Method)
....
Thread-0xa00 "ExecuteThread: '6' for queue: 'ExecutionAsynchroneThreadQueue'"
<Active, priority=5, DAEMON> {
-- Blocked trying to get lock: com/ibatis/sqlmap/engine/cache/[EMAIL
PROTECTED] lock]
jrockit/vm/Threads.shortNap(I)V(Native Method)
jrockit/vm/Locks.waitForThinRelease(Ljava/lang/Object;I)I(Optimized Method)
jrockit/vm/Locks.monitorEnterSecondStage(Ljava/lang/Object;I)Ljava/lang/Object;(Optimized
Method)
com/ibatis/sqlmap/engine/cache/CacheModel.getObject(Lcom/ibatis/sqlmap/engine/cache/CacheKey;)Ljava/lang/Object;(Optimized
Method)
com/ibatis/sqlmap/engine/mapping/statement/CachingStatement.executeQueryForList(Lcom/ibatis/sqlmap/engine/scope/RequestScope;Lcom/ibatis/s
qlmap/engine/transaction/Transaction;Ljava/lang/Object;II)Ljava/util/List;(Optimized
Method)
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