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https://issues.apache.org/jira/browse/UIMA-3798?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marshall Schor resolved UIMA-3798.
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Resolution: Fixed
I think the cause was re-locking an already-locked lock, and then only
unlocking it once...
> JCasHashMap race condition hang
> -------------------------------
>
> Key: UIMA-3798
> URL: https://issues.apache.org/jira/browse/UIMA-3798
> Project: UIMA
> Issue Type: Improvement
> Components: Core Java Framework
> Affects Versions: 2.6.0SDK
> Reporter: Marshall Schor
> Assignee: Marshall Schor
> Fix For: 2.6.0SDK
>
>
> Jerry C discovered a hang failure - I was able to reproduce on a particular
> large machine. Traced to a race condition - where a "reserve" is found, and
> then a lock is acquired. There's a chance that between these 2 events,
> another thread can change the reserve to a real value - if this happens, a
> hang. Recheck the value after acquiring the lock.
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