Michael McCandless created LUCENE-9661:
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Summary: Another classloader deadlock?
Key: LUCENE-9661
URL: https://issues.apache.org/jira/browse/LUCENE-9661
Project: Lucene - Core
Issue Type: Bug
Affects Versions: master (9.0)
Reporter: Michael McCandless
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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