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https://issues.apache.org/jira/browse/SOLR-7836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14698687#comment-14698687
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Mark Miller commented on SOLR-7836:
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bq. Perhaps the right solution was to just pass the IndexWriter down once you
aquire it.
bq. Passing the indexWriter down would also fix the NPEs I think since then
openReader wouldn't try to obtain it from the yet-to-be-finished new update
handler?
Wasn't that Erik's first fix attempt?
bq. I think the solution is to just pass the IndexWriter down to addAndDelete,
but won't have time to really look until this evening.
> 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, deadlock_3.res.zip, deadlock_5_pass_iw.res.zip, deadlock_test
>
>
> 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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