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https://issues.apache.org/jira/browse/LUCENE-9661?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Namgyu Kim resolved LUCENE-9661.
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Resolution: Fixed
> Another classloader deadlock?
> -----------------------------
>
> Key: LUCENE-9661
> URL: https://issues.apache.org/jira/browse/LUCENE-9661
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 8.0, master (9.0)
> Reporter: Michael McCandless
> Assignee: Namgyu Kim
> Priority: Blocker
> Fix For: 8.x, master (9.0), 8.8
>
> Attachments: deadlock inspections.jpg, deadlock_test.patch, intellij
> inspection results.html
>
> Time Spent: 2h 40m
> Remaining Estimate: 0h
>
> The {{java}} processes spawned by our Lucene nightly benchmarks sometimes
> randomly hang, apparently while loading classes across threads, under
> contention.
> I've opened [this {{luceneutil}} issue with some
> details|https://github.com/mikemccand/luceneutil/issues/89], but
> [~uschindler] suggested I open an issue here too since he has been seeing
> this in CI builds too.
> It is rare, maybe once a week in the nightly benchmarks (which spawn many
> {{java}} processes with many threads across 128 CPU cores). It is clearly a
> deadlock – when it strikes, the process hangs forever until I notice and
> {{kill -9}} it. I posted a coupled {{jstacks}} in the issue above.
> [~rcmuir] suggested using {{classcycle}} to maybe statically dig into
> possible deadlocks ... I have not tried that yet.
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