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https://issues.apache.org/jira/browse/LUCENE-2730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12926605#action_12926605
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Uwe Schindler commented on LUCENE-2730:
---------------------------------------

Hangs in this and other tests can also come from increet test MT programming. 
Just think about Michael Busch's talk @ LuceneRev. The test uses some fields in 
the thread that are not volatile or synchronized on. The test is fixed in 
trunk/3.x during our total test overhaul. There are about 10 tests using the 
same wrong thread inner class.

If we want to fix that we must also fix backwards... happy tag creating again 
*g*

> intermittent deadlock in TestAtomicUpdate,TestIndexWriterExceptions
> -------------------------------------------------------------------
>
>                 Key: LUCENE-2730
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2730
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 2.9.3, 3.0.2
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 2.9.4, 3.0.3
>
>         Attachments: LUCENE-2730.patch
>
>
> While backporting issues for 2.9.x/3.0.x release I hit deadlocks in these two 
> tests, under both test-core and test-tag.

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