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https://issues.apache.org/jira/browse/LUCENE-5612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13975194#comment-13975194
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Uwe Schindler commented on LUCENE-5612:
---------------------------------------

Robert: Before you commit: Can you remove the obsolete import statement 
(IOUtils), which I added to file LockStressTest.java? This one was used in an 
earlier version of my patch only and I forgot to remove it after I was done.

For backporting, after you committed, there should be then in total 3 commits 
in trunk with this issue number, not just 2.

> LockStressTest fails always with NativeFSLockFactory
> ----------------------------------------------------
>
>                 Key: LUCENE-5612
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5612
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Robert Muir
>            Priority: Blocker
>             Fix For: 4.8
>
>         Attachments: LUCENE-5612-instant-crush.patch, 
> LUCENE-5612-instant-crush.patch, 
> LUCENE-5612-more-sophisticated-crusher.patch, 
> LUCENE-5612-more-sophisticated-crusher.patch, 
> LUCENE-5612-more-sophisticated-crusher.patch, 
> LUCENE-5612-more-sophisticated-crusher.patch, 
> LUCENE-5612-more-sophisticated-crusher.patch, 
> LUCENE-5612-more-sophisticated-crusher.patch, LUCENE-5612-tester.patch, 
> LUCENE-5612-tester.patch, LUCENE-5612.patch, LUCENE-5612.patch
>
>
> I was looking at this, because i wanted to remove the static map inside 
> NativeFSLockFactory (no particular reason: it just smells bad, we require 
> java7, and you get overlappingexception as of java6 so its unnecessary).
> Before changing any code, i wanted to run lockstresstest first, just to 
> ensure it works: but it fails always. Simple works fine always.
> Exception in thread "main" java.lang.RuntimeException: 
> java.lang.RuntimeException: lock was double acquired at 
> org.apache.lucene.store.VerifyingLockFactory$CheckedLock.verify(VerifyingLockFactory.java:67)



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