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

Karen Zhu (JIRA) issues at jboss.org
Fri Dec 16 06:22:00 EST 2016 

     [ https://issues.jboss.org/browse/DROOLS-1383?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Karen Zhu updated DROOLS-1383:
------------------------------
    Description: 
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.


> 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
>
> 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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