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Author pitrou
Recipients Jorge Herskovic, Marandil, davin, ned.deily, pitrou, sbt
Date 2017-06-13.09:25:11
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The simple answer here is _run_finalizers() is not thread-safe, but finalizers can be registered or cancelled from any thread.

I could not write a simple synthetic script to reproduce the issue, but it should nevertheless be fixable.
Date User Action Args
2017-06-13 09:25:11pitrousetrecipients: + pitrou, ned.deily, sbt, davin, Jorge Herskovic, Marandil
2017-06-13 09:25:11pitrousetmessageid: <>
2017-06-13 09:25:11pitroulinkissue24484 messages
2017-06-13 09:25:11pitroucreate