[jboss-jira] [JBoss JIRA] (JBRULES-3528) Deadlock when using pseudo session clock

[RH Bugzilla Integration (JIRA)]

    [ https://issues.jboss.org/browse/JBRULES-3528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12713419#comment-12713419 ] 

RH Bugzilla Integration commented on JBRULES-3528:
--------------------------------------------------

Edson Tirelli <etirelli at redhat.com> changed the Status of [bug 851307|https://bugzilla.redhat.com/show_bug.cgi?id=851307] from NEW to MODIFIED
                
> Deadlock when using pseudo session clock
> ----------------------------------------
>
>                 Key: JBRULES-3528
>                 URL: https://issues.jboss.org/browse/JBRULES-3528
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: drools-core (fusion)
>    Affects Versions: 5.3.0.Final, 5.4.0.Final
>            Reporter: Cyril Sochor
>            Assignee: Edson Tirelli
>              Labels: deadlock, fireuntilhalt, pseudoclock
>             Fix For: 5.5.0.Beta1
>
>         Attachments: PseudoClockEventsTest.java
>
>
> Deadlock when using fireUntilHalt in one thread and PseudoClockScheduler.advanceTime() in second thread.
> Surroundings: 
> I read many events from JMS queue, each event has timestamp. I need temporal operations measured by time in timestamps. E.g. SomeEvent() over window:time(10s) means events with timestamps in interval 10s, not events inserted in interval 10s. So, I must use pseudo session clock and advance time before event insert into statefull session. Sometimes deadlock occured or NullPointerException is thrown. 
> I created test case.
> Deadlock stacktraces:
> Name: Thread-1
> State: BLOCKED on org.drools.time.impl.PseudoClockScheduler at 4599d5b owned by: Thread-0
> Total blocked: 6  Total waited: 3
> Stack trace:
>  org.drools.time.impl.PseudoClockScheduler.getCurrentTime(PseudoClockScheduler.java:104)
> org.drools.common.AbstractWorkingMemory.endOperation(AbstractWorkingMemory.java:1345)
> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1240)
>    - locked org.drools.common.DefaultAgenda at 57e2793d
> org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1126)
> org.drools.common.DefaultAgenda.fireUntilHalt(DefaultAgenda.java:1327)
> org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:754)
>    - locked org.drools.reteoo.ReteooStatefulSession at 31d8d237
> org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:730)
> org.drools.impl.StatefulKnowledgeSessionImpl.fireUntilHalt(StatefulKnowledgeSessionImpl.java:245)
> org.drools.integrationtests.StreamsTest$1.run(StreamsTest.java:526)
> java.lang.Thread.run(Thread.java:662)
> Name: Thread-0
> State: BLOCKED on org.drools.common.DefaultAgenda at 57e2793d owned by: Thread-1
> Total blocked: 2  Total waited: 0
> Stack trace:
>  org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1168)
> org.drools.common.Scheduler$ActivationTimerJob.execute(Scheduler.java:86)
> org.drools.time.impl.DefaultTimerJobInstance.call(DefaultTimerJobInstance.java:47)
> org.drools.time.impl.DefaultTimerJobInstance.call(DefaultTimerJobInstance.java:1)
> org.drools.time.impl.PseudoClockScheduler.runCallBacks(PseudoClockScheduler.java:203)
> org.drools.time.impl.PseudoClockScheduler.advanceTime(PseudoClockScheduler.java:156)
>    - locked org.drools.time.impl.PseudoClockScheduler at 4599d5b
> org.drools.integrationtests.StreamsTest.processStocks(StreamsTest.java:533)
> org.drools.integrationtests.StreamsTest.testEvenFirePseudoClockRulesAB(StreamsTest.java:500)
> sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> java.lang.reflect.Method.invoke(Method.java:597)
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
> org.junit.internal.runners.statements.FailOnTimeout$1.run(FailOnTimeout.java:28)

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