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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-5532) AutomatonQuery.hashCode is not thread safe
Date Mon, 17 Mar 2014 18:13:54 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-5532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13938142#comment-13938142
] 

Robert Muir commented on LUCENE-5532:
-------------------------------------

Should I backport to 4.7.1 branch?

> AutomatonQuery.hashCode is not thread safe
> ------------------------------------------
>
>                 Key: LUCENE-5532
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5532
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Robert Muir
>         Attachments: LUCENE-5532.patch, LUCENE-5532.patch
>
>
> This hashCode is implemented based on  #states and #transitions.
> These methods use getNumberedStates() though, which may oversize itself during construction
and then "size down" when its done. But numberedStates is prematurely set (before its "ready"),
which can cause a hashCode call from another thread to see a corrupt state... causing things
like NPEs from null states and other strangeness. I don't think we should set this variable
until its "finished".



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