Michael Braun created LUCENE-8252:
-------------------------------------

             Summary: ArrayIndexOutOfBoundsException hit in 
lucene50.ForUtil.readBlock
                 Key: LUCENE-8252
                 URL: https://issues.apache.org/jira/browse/LUCENE-8252
             Project: Lucene - Core
          Issue Type: Bug
    Affects Versions: 6.6.2
            Reporter: Michael Braun


We hit this on an autowarming query with a phrase on a particular shard, and it 
keeps happening with similar errors (and on other position-sensitive queries) 
post-restart on both that particular autowarming query and other queries. I'm 
guessing somehow a file in the index got written incorrectly with regard to 
positions.

{code}
10:11:58 ERROR 04-06 17:52:06.360 org.apache.solr.handler.RequestHandlerBase 
(searcherExecutor-9-thread-1-processing-n:ourip:8983_solr 
x:collection_shardY_replica1 s:shardY c:collection) [s:Y ] 
java.lang.ArrayIndexOutOfBoundsException: -95
        at org.apache.lucene.codecs.lucene50.ForUtil.readBlock(ForUtil.java:196)
        at 
org.apache.lucene.codecs.lucene50.Lucene50PostingsReader$BlockPostingsEnum.refillPositions(Lucene50PostingsReader.java:638)
        at 
org.apache.lucene.codecs.lucene50.Lucene50PostingsReader$BlockPostingsEnum.skipPositions(Lucene50PostingsReader.java:747)
        at 
org.apache.lucene.codecs.lucene50.Lucene50PostingsReader$BlockPostingsEnum.nextPosition(Lucene50PostingsReader.java:768)
        at 
org.apache.lucene.search.ExactPhraseScorer.phraseFreq(ExactPhraseScorer.java:128)
        at 
org.apache.lucene.search.ExactPhraseScorer.access$000(ExactPhraseScorer.java:27)
        at 
org.apache.lucene.search.ExactPhraseScorer$1.matches(ExactPhraseScorer.java:73)
        at 
org.apache.lucene.search.Weight$DefaultBulkScorer.scoreAll(Weight.java:253)
        at 
org.apache.lucene.search.Weight$DefaultBulkScorer.score(Weight.java:197)
        at org.apache.lucene.search.BulkScorer.score(BulkScorer.java:39)
        at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:668)
        at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:472)
        at 
org.apache.solr.search.SolrIndexSearcher.buildAndRunCollectorChain(SolrIndexSearcher.java:217)
        at 
org.apache.solr.search.SolrIndexSearcher.getDocListNC(SolrIndexSearcher.java:1582)
        at 
org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:1399)
        at 
org.apache.solr.search.SolrIndexSearcher.search(SolrIndexSearcher.java:566)
        at 
org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:545)
        at 
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:296)
        at 
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:173)
        at org.apache.solr.core.SolrCore.execute(SolrCore.java:2477)
        at 
org.apache.solr.core.QuerySenderListener.newSearcher(QuerySenderListener.java:74)
        at 
org.apache.solr.core.SolrCore.lambda$getSearcher$15(SolrCore.java:2249)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:229)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
{code}



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