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https://issues.apache.org/jira/browse/SOLR-6846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14553194#comment-14553194
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Jan Høydahl commented on SOLR-6846:
-----------------------------------

[~avishai], have you experienced this deadlock yourself, and did the patch fix 
it for you?

> deadlock in UninvertedField#getUninvertedField()
> ------------------------------------------------
>
>                 Key: SOLR-6846
>                 URL: https://issues.apache.org/jira/browse/SOLR-6846
>             Project: Solr
>          Issue Type: Bug
>          Components: search
>    Affects Versions: 4.10.2
>            Reporter: Avishai Ish-Shalom
>             Fix For: 5.0, Trunk
>
>         Attachments: SOLR-6846.patch
>
>
> Multiple concurrent calls to UninvertedField#getUninvertedField may deadlock: 
> if a call gets to {{cache.wait()}} before another thread gets to the 
> synchronized block around {{cache.notifyAll()}} code will deadlock because 
> {{cache.wait()}} is synchronized with the same monitor object.



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