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https://issues.apache.org/jira/browse/SOLR-7836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14679959#comment-14679959
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Mark Miller commented on SOLR-7836:
-----------------------------------

bq.  I find it really suspicious that the the ulog.add() call is sometimes 
protected and sometimes not. 

That's pretty unsound logic for making a change in such a complicated area of 
code...

> Possible deadlock when closing refcounted index writers.
> --------------------------------------------------------
>
>                 Key: SOLR-7836
>                 URL: https://issues.apache.org/jira/browse/SOLR-7836
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Erick Erickson
>            Assignee: Erick Erickson
>             Fix For: Trunk, 5.4
>
>         Attachments: SOLR-7836-synch.patch, SOLR-7836.patch, SOLR-7836.patch, 
> SOLR-7836.patch
>
>
> Preliminary patch for what looks like a possible race condition between 
> writerFree and pauseWriter in DefaultSorlCoreState.
> Looking for comments and/or why I'm completely missing the boat.



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