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https://issues.apache.org/jira/browse/SOLR-7836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14698680#comment-14698680
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Mark Miller commented on SOLR-7836:
-----------------------------------
{quote}
So: one can't call getIndexWriter() and then do anything else that will
eventually call getIndexWriter() or newIndexWriter()
If we keep that restriction, then moving the ulog.add outside of the
getIndexWriter/release block was correct.
{quote}
Right - the expected use is to be careful and quickly get and release the
writer so that you don't accidentally try and getwriter or newwriter in
between. This is why I thought Erik's first fix attempt sounded right. But then
I guess he started hitting the deadlock you are still getting and figured it
was not correct. Seems like it is correct, but we also have to address this
other issue.
> 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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