[jboss-jira] [JBoss JIRA] (DROOLS-1383) Deadlock in PackageClassLoader

[Mario Fusco (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-1383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13341149#comment-13341149 ] 

Mario Fusco commented on DROOLS-1383:
-------------------------------------

What concerns me is mainly your last sentence

{quote}And in ClassLoader.class line 283, the parallelLockMap is null because ParallelLoaders.isRegistered(this.getClass()) returns false. So did the PackageClassLoader.class in Drools lost the register() method? I'm so confused about this.{quote}

I don't see why the PackageClassLoader should call that register() method. Afaik it never did in past and the it didn't "lost" that invocation.

That said it's really impossible for me to further investigate this issue without a proper reproducer. Could you please send one?



> Deadlock in PackageClassLoader
> ------------------------------
>
>                 Key: DROOLS-1383
>                 URL: https://issues.jboss.org/browse/DROOLS-1383
>             Project: Drools
>          Issue Type: Bug
>          Components: core engine
>    Affects Versions: 6.4.0.Final
>            Reporter: Karen Zhu
>            Assignee: Mario Fusco
>            Priority: Blocker
>
> Found one deadlock in PackageLoader. Did I write rule in a bad way? How did a consequence of a rule will get the lock of PackageLoader which is needed by checkCerts(). Below is threaddump information.
> Found one Java-level deadlock:
> =============================
> "Thread-105-CustomClass-executor[17 17]":
> waiting to lock monitor 0x00007f933c005b38 (object 0x00007f963ed294b0, a java.lang.Object),
> which is held by "Thread-17-CustomClass-executor[33 33]"
> "Thread-17-CustomClass-executor[33 33]":
> waiting to lock monitor 0x00007f933c0031f8 (object 0x00007f963ed294c0, a org.drools.core.rule.JavaDialectRuntimeData$PackageClassLoader),
> which is held by "Thread-33-CustomClass-executor[9 9]"
> "Thread-33-CustomClass-executor[9 9]":
> waiting to lock monitor 0x00007f933c005b38 (object 0x00007f963ed294b0, a java.lang.Object),
> which is held by "Thread-17-CustomClass-executor[33 33]"
> Java stack information for the threads listed above:
> ===================================================
> "Thread-105-CustomClass-executor[17 17]":
> at org.drools.core.rule.JavaDialectRuntimeData$PackageClassLoader.fastFindClass(JavaDialectRuntimeData.java:662)
> waiting to lock <0x00007f963ed294b0> (a java.lang.Object)
> at org.drools.core.rule.JavaDialectRuntimeData$PackageClassLoader.loadClass(JavaDialectRuntimeData.java:642)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
> at org.drools.core.rule.MVELDialectRuntimeData.getParserConfiguration(MVELDialectRuntimeData.java:299)
> at org.drools.core.base.mvel.MVELCompilationUnit.getCompiledExpression(MVELCompilationUnit.java:238)
> at org.drools.core.rule.constraint.MvelConstraint.createMvelConditionEvaluator(MvelConstraint.java:264)
> at org.drools.core.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:248)
> at org.drools.core.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:214)
> at org.drools.core.reteoo.AlphaNode.assertObject(AlphaNode.java:131)
> at org.drools.core.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:63)
> at org.drools.core.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:366)
> at org.drools.core.reteoo.ObjectTypeNode.propagateAssert(ObjectTypeNode.java:300)
> at org.drools.core.phreak.PropagationEntry$Insert.execute(PropagationEntry.java:93)
> at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:78)
> at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:73)
> at org.drools.core.impl.StatefulKnowledgeSessionImpl.flushPropagations(StatefulKnowledgeSessionImpl.java:2017)
> at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1334)
> at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1288)
> at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1306)
> at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1297)
> at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1278)
> "Thread-17-CustomClass-executor[33 33]":
> at java.lang.ClassLoader.checkCerts(ClassLoader.java:942)
> waiting to lock <0x00007f963ed294c0> (a org.drools.core.rule.JavaDialectRuntimeData$PackageClassLoader)
> at java.lang.ClassLoader.preDefineClass(ClassLoader.java:666)
> at java.lang.ClassLoader.defineClass(ClassLoader.java:794)
> at org.drools.core.rule.JavaDialectRuntimeData$PackageClassLoader.internalDefineClass(JavaDialectRuntimeData.java:694)
> at org.drools.core.rule.JavaDialectRuntimeData$PackageClassLoader.fastFindClass(JavaDialectRuntimeData.java:665)
> locked <0x00007f963ed294b0> (a java.lang.Object)
> at org.drools.core.rule.JavaDialectRuntimeData$PackageClassLoader.loadClass(JavaDialectRuntimeData.java:642)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
> at org.drools.core.rule.MVELDialectRuntimeData.getParserConfiguration(MVELDialectRuntimeData.java:299)
> at org.drools.core.base.mvel.MVELCompilationUnit.getCompiledExpression(MVELCompilationUnit.java:238)
> at org.drools.core.rule.constraint.MvelConstraint.createMvelConditionEvaluator(MvelConstraint.java:264)
> at org.drools.core.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:248)
> at org.drools.core.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:214)
> at org.drools.core.reteoo.AlphaNode.assertObject(AlphaNode.java:131)
> at org.drools.core.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:63)
> at org.drools.core.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:366)
> at org.drools.core.reteoo.ObjectTypeNode.propagateAssert(ObjectTypeNode.java:300)
> at org.drools.core.phreak.PropagationEntry$Insert.execute(PropagationEntry.java:93)
> at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:78)
> at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:73)
> at org.drools.core.impl.StatefulKnowledgeSessionImpl.flushPropagations(StatefulKnowledgeSessionImpl.java:2017)
> at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1334)
> at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1288)
> at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1306)
> at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1297)
> at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1278)
> "Thread-33-CustomClass-executor[9 9]":
> at org.drools.core.rule.JavaDialectRuntimeData$PackageClassLoader.fastFindClass(JavaDialectRuntimeData.java:662)
> waiting to lock <0x00007f963ed294b0> (a java.lang.Object)
> at org.drools.core.rule.JavaDialectRuntimeData$PackageClassLoader.loadClass(JavaDialectRuntimeData.java:642)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
> at com.cdr.apEventWrapperRules.ConstructorApBeansWrapper.constructorApBeansWrapper(ConstructorApBeansWrapper.java:55)
> at com.cdr.apEventWrapperRules.Rule_UCR2359988097.defaultConsequence(Rule_UCR2359988097.java:7)
> at com.cdr.apEventWrapperRules.Rule_UCR2359988097DefaultConsequenceInvokerGenerated.evaluate(Unknown Source)
> at com.cdr.apEventWrapperRules.Rule_UCR2359988097DefaultConsequenceInvoker.evaluate(Unknown Source)
> at org.drools.core.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1089)
> at org.drools.core.phreak.RuleExecutor.fire(RuleExecutor.java:121)
> at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:74)
> at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1007)
> at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1350)
> at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1288)
> at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1306)
> at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1297)
> at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1278)
> Found 1 deadlock.



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