Karthikeyan Singaravelan <tir.kar...@gmail.com> added the comment:

Thanks for the report. Is this a case of the warning below?

https://docs.python.org/3.8/library/multiprocessing.html#multiprocessing.connection.Connection.recv

> Warning The Connection.recv() method automatically unpickles the data it 
> receives, which can be a security risk unless you can trust the process which 
> sent the message.

> Therefore, unless the connection object was produced using Pipe() you should 
> only use the recv() and send() methods after performing some sort of 
> authentication. See Authentication keys.

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nosy: +xtreak

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<https://bugs.python.org/issue40039>
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