[jira] [Resolved] (LUCENE-7032) jdk-9-ea+105 breaks MinimizeOperations.minimize()

["Robert Muir (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-7032?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Muir resolved LUCENE-7032.
---------------------------------
    Resolution: Fixed

See https://bugs.openjdk.java.net/browse/JDK-8150280

Tobias Hartmann debugged the issue.

> jdk-9-ea+105 breaks MinimizeOperations.minimize()
> -------------------------------------------------
>
>                 Key: LUCENE-7032
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7032
>             Project: Lucene - Core
>          Issue Type: Bug
>    Affects Versions: master
>            Reporter: Robert Muir
>              Labels: Java9
>
> As soon as jdk-9-ea+105 was put into test rotation, automaton tests have been sporatically failing in non-reproducible ways. All of them invoke hopcroft minimization either directly or indirectly.
> The bug manifests in several forms:
> * ArrayIndexOutOfBoundsException in minimize()
> * IllegalArgumentException for an explicit bounds check
> * incorrect resulting automaton
> This method is ... let's say not the ideal one to debug something like this, but I've at least got it where I can make it fail in a few minutes with beasting, so we can try simple things like turning on/off jvm flags to try to narrow it more.
> It would be really great to make it fail more efficiently, but unfortunately it takes many thousands of iterations until we understand more about it.



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