[infinispan-issues] [JBoss JIRA] (ISPN-5524) Race condition in SemaphoreCompletionService.executeFront()

[RH Bugzilla Integration (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-5524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13075352#comment-13075352 ] 

RH Bugzilla Integration commented on ISPN-5524:
-----------------------------------------------

Dan Berindei <dberinde at redhat.com> changed the Status of [bug 1229181|https://bugzilla.redhat.com/show_bug.cgi?id=1229181] from ASSIGNED to POST

> Race condition in SemaphoreCompletionService.executeFront()
> -----------------------------------------------------------
>
>                 Key: ISPN-5524
>                 URL: https://issues.jboss.org/browse/ISPN-5524
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 7.2.2.Final, 8.0.0.Alpha1
>            Reporter: Dan Berindei
>            Assignee: Dan Berindei
>            Priority: Blocker
>              Labels: testsuite_stability
>             Fix For: 8.0.0.Alpha2, 7.2.3.Final
>
>
> If two threads call {{executeFront()}} at the same time, it's possible that none of them executes any task, although there are permits available, and one of the threads just added a task in the queue. This scenario causes random initial state transfer timeouts in the testsuite:
> # T1: continueTaskInBackground(): queue = empty, permits = 0
> # T1: backgroundTaskFinished()
> # T1: = semaphore.release(): queue = empty, permits = 1
> # T1: = executeFront()
> # T1: == semaphore.acquire() -> true: queue = empty, permits = 0
> # T2: == queue.poll() -> null
> # T2: submit(task)
> # T2: = executeFront()
> # T2: == semaphore.acquire() -> false
> # T2: return without executing any task
> # T1: return without executing any task
> Failure example: http://ci.infinispan.org/viewLog.html?buildId=27153&tab=buildResultsDiv&buildTypeId=Infinispan_MasterHotspotJdk8#testNameId3522947143330444111



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