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From "Suresh Thalamati (JIRA)" <derby-...@db.apache.org>
Subject [jira] Created: (DERBY-764) java level dead lock when jar operataion are running in parallel in different transactions.
Date Thu, 15 Dec 2005 23:35:45 GMT
java level  dead lock  when jar operataion are running in parallel in different transactions.

----------------------------------------------------------------------------------------------

         Key: DERBY-764
         URL: http://issues.apache.org/jira/browse/DERBY-764
     Project: Derby
        Type: Bug
    Reporter: Suresh Thalamati
    Priority: Minor



Found one Java-level deadlock:
=============================
"Thread-2":
  waiting to lock monitor 0x00a8872c (object 0x03002be8, a org.apache.derby.impl
.services.locks.LockSet),
  which is held by "Thread-0"
"Thread-0":
  waiting to lock monitor 0x00a8882c (object 0x03022168, a org.apache.derby.impl
.services.reflect.UpdateLoader),
  which is held by "Thread-2"

Java stack information for the threads listed above:
===================================================
"Thread-2":
        at org.apache.derby.impl.services.locks.LockSet.lockObject(LockSet.java:
294)
        - waiting to lock <0x03002be8> (a org.apache.derby.impl.services.locks.L
ockSet)
        at org.apache.derby.impl.services.locks.SinglePool.lockAnObject(SinglePo
ol.java:174)
        at org.apache.derby.impl.services.locks.SinglePool.lockObject(SinglePool
.java:226)
        at org.apache.derby.impl.services.reflect.UpdateLoader.lockClassLoader(U
pdateLoader.java:265)
        at org.apache.derby.impl.services.reflect.UpdateLoader.modifyJar(UpdateL
oader.java:219)
        - locked <0x03022168> (a org.apache.derby.impl.services.reflect.UpdateLo
ader)
        at org.apache.derby.impl.services.reflect.DatabaseClasses.notifyModifyJa
r(DatabaseClasses.java:255)
        at org.apache.derby.impl.sql.execute.JarUtil.notifyLoader(JarUtil.java:4
01)
        at org.apache.derby.impl.sql.execute.JarUtil.add(JarUtil.java:135)
        at org.apache.derby.impl.sql.execute.JarUtil.add(JarUtil.java:104)
        at org.apache.derby.impl.sql.execute.AddJarConstantAction.executeConstan
tAction(AddJarConstantAction.java:96)
        at org.apache.derby.impl.sql.execute.JarDDL.add(JarDDL.java:45)
        at org.apache.derby.catalog.SystemProcedures.INSTALL_JAR(SystemProcedure
s.java:1011)
        at org.apache.derby.exe.ac2753c07bx0108x308exa52cxffffec5b7c421.g0(Unkno
wn Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.apache.derby.impl.services.reflect.ReflectMethod.invoke(ReflectMe
thod.java:45)
        at org.apache.derby.impl.sql.execute.CallStatementResultSet.open(CallSta
tementResultSet.java:67)
        at org.apache.derby.impl.sql.GenericPreparedStatement.execute(GenericPre
paredStatement.java:368)
        at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(EmbedState
ment.java:1142)
        - locked <0x03141448> (a org.apache.derby.impl.jdbc.EmbedConnection30)
        at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java
:550)
        - locked <0x03141448> (a org.apache.derby.impl.jdbc.EmbedConnection30)
        at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java
:480)
        at org.apache.derbyTesting.functionTests.tests.store.OnlineBackupTest3$A
syncStatementThread.run(OnlineBackupTest3.java:451)
"Thread-0":
        at org.apache.derby.impl.services.reflect.UpdateLoader.needReload(Update
Loader.java:304)
        - waiting to lock <0x03022168> (a org.apache.derby.impl.services.reflect
.UpdateLoader)
        at org.apache.derby.impl.services.reflect.ClassLoaderLock.unlockEvent(Up
dateLoader.java:362)
        at org.apache.derby.impl.services.locks.Lock.unlock(Lock.java:128)
        at org.apache.derby.impl.services.locks.LockControl.unlock(LockControl.j
ava:160)
        at org.apache.derby.impl.services.locks.LockSet.unlock(LockSet.java:564)

        - locked <0x03002be8> (a org.apache.derby.impl.services.locks.LockSet)
        at org.apache.derby.impl.services.locks.LockSpace.unlockGroup(LockSpace.
java:126)
        - locked <0x03153db8> (a org.apache.derby.impl.services.locks.LockSpace)

        at org.apache.derby.impl.services.locks.SinglePool.unlockGroup(SinglePoo
l.java:306)
        at org.apache.derby.impl.store.raw.xact.Xact.releaseAllLocks(Xact.java:1
854)
        at org.apache.derby.impl.store.raw.xact.Xact.postComplete(Xact.java:1899
)
        at org.apache.derby.impl.store.raw.xact.Xact.completeCommit(Xact.java:80
5)
        at org.apache.derby.impl.store.raw.xact.Xact.commit(Xact.java:847)
        at org.apache.derby.impl.store.raw.xact.Xact.commit(Xact.java:642)
        at org.apache.derby.impl.store.access.RAMTransaction.commit(RAMTransacti
on.java:1953)
        at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.doCom
mit(GenericLanguageConnectionContext.java:1105)
        at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.userC
ommit(GenericLanguageConnectionContext.java:935)
        at org.apache.derby.impl.jdbc.TransactionResourceImpl.commit(Transaction
ResourceImpl.java:237)
        at org.apache.derby.impl.jdbc.EmbedConnection.commit(EmbedConnection.jav
a:862)
        - locked <0x031413b0> (a org.apache.derby.impl.jdbc.EmbedConnection30)
        at org.apache.derbyTesting.functionTests.tests.store.OnlineBackupTest3.i
nstallJarTest(OnlineBackupTest3.java:227)
        at org.apache.derbyTesting.functionTests.tests.store.OnlineBackupTest3.r
unTest(OnlineBackupTest3.java:90)
        at org.apache.derbyTesting.functionTests.tests.store.OnlineBackupTest3.m
ain(OnlineBackupTest3.java:49)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.apache.derbyTesting.functionTests.harness.RunClass.run(RunClass.j
ava:50)
        - locked <0x02fe5b78> (a org.apache.derbyTesting.functionTests.harness.R
unClass)
        at java.lang.Thread.run(Thread.java:595)

Found 1 deadlock.


Note : Found this issue while doing online backup testing, , but it does not look like online
backup related,. 

Scenario:

--- one thread (Thread 0) is committing  a transaction with   a  install  jar operation in
it. 
--- another thread (Thread 1) is  attempting to add a jar 


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