Robert Muir created LUCENE-5532:
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Summary: 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
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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