[jboss-jira] [JBoss JIRA] (DROOLS-2174) Deadlock between AbstractWorkingMemory and DefaultAgenda

[Mario Fusco (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-2174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13504416#comment-13504416 ] 

Mario Fusco commented on DROOLS-2174:
-------------------------------------

Do you have a reproducer for this? Otherwise I don't see how I could investigate and eventually fix this problem.

> Deadlock between AbstractWorkingMemory and DefaultAgenda
> --------------------------------------------------------
>
>                 Key: DROOLS-2174
>                 URL: https://issues.jboss.org/browse/DROOLS-2174
>             Project: Drools
>          Issue Type: Bug
>    Affects Versions: 5.5.0.Final
>            Reporter: Umang Sharma
>            Assignee: Mario Fusco
>             Fix For: 6.0.0.CR2
>
>
>  I am getting a similar deadlock as the one in the cloned issue. We are using following dependencies:
> <dependency>
> <groupId>org.drools</groupId>
> <artifactId>drools-templates</artifactId>
> <version>$
> {runtime.version}</version>
> </dependency>
> <dependency>
> <groupId>org.kie</groupId>
> <artifactId>kie-api</artifactId>
> <version>${runtime.version}
> </version>
> </dependency>
> <dependency>
> <groupId>org.drools</groupId>
> <artifactId>drools-core</artifactId>
> <version>$
> {runtime.version}</version>
> </dependency>
> <dependency>
> <groupId>org.drools</groupId>
> <artifactId>drools-compiler</artifactId>
> <version>${runtime.version}
> </version>
> </dependency>
> runtime.version = 6.5.0-Final
> I have around 50 off threads stuck in a deadlock. 49 of them are having following stack trace:
> "THREAD-4" #124 prio=5 os_prio=0 tid=0x00000000015fc800 nid=0x3a5d waiting on condition [0x00007fc773e7b000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> parking to wait for <0x000000074d189818> (a java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared(AbstractQueuedSynchronizer.java:967)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(AbstractQueuedSynchronizer.java:1283)
> at java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock(ReentrantReadWriteLock.java:727)
> at org.drools.core.impl.KnowledgeBaseImpl.readLock(KnowledgeBaseImpl.java:703)
> at org.drools.core.impl.KnowledgeBaseImpl.newStatefulSession(KnowledgeBaseImpl.java:1434)
> at org.drools.core.impl.KnowledgeBaseImpl.newStatefulSession(KnowledgeBaseImpl.java:1422)
> at org.drools.core.impl.KnowledgeBaseImpl.newStatefulKnowledgeSession(KnowledgeBaseImpl.java:308)
> at org.drools.core.impl.KnowledgeBaseImpl.newKieSession(KnowledgeBaseImpl.java:385)
> at org.drools.compiler.kie.builder.impl.KieContainerImpl.newKieSession(KieContainerImpl.java:693)
> at org.drools.compiler.kie.builder.impl.KieContainerImpl.newKieSession(KieContainerImpl.java:629)
> at org.drools.compiler.kie.builder.impl.KieContainerImpl.newKieSession(KieContainerImpl.java:611)
> And one of them is stuck in the following stack trace:
> "THREAD-4" #124 prio=5 os_prio=0 tid=0x00000000015fc800 nid=0x3a5d waiting on condition [0x00007fc773e7b000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> parking to wait for <0x000000074d189818> (a java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared(AbstractQueuedSynchronizer.java:967)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(AbstractQueuedSynchronizer.java:1283)
> at java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock(ReentrantReadWriteLock.java:727)
> at org.drools.core.impl.KnowledgeBaseImpl.readLock(KnowledgeBaseImpl.java:703)
> at org.drools.core.impl.KnowledgeBaseImpl.newStatefulSession(KnowledgeBaseImpl.java:1434)
> at org.drools.core.impl.KnowledgeBaseImpl.newStatefulSession(KnowledgeBaseImpl.java:1422)
> at org.drools.core.impl.KnowledgeBaseImpl.newStatefulKnowledgeSession(KnowledgeBaseImpl.java:308)
> at org.drools.core.impl.KnowledgeBaseImpl.newKieSession(KnowledgeBaseImpl.java:385)
> at org.drools.compiler.kie.builder.impl.KieContainerImpl.newKieSession(KieContainerImpl.java:693)
> at org.drools.compiler.kie.builder.impl.KieContainerImpl.newKieSession(KieContainerImpl.java:629)
> at org.drools.compiler.kie.builder.impl.KieContainerImpl.newKieSession(KieContainerImpl.java:611)
> Please help us out in fixing this. Its a production system serving millions of users.
> PS: This is was reproduced under a medium load where we create 50 stateful sessions in parallel and also some rule were also getting added in the KieContainer at the same time.



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