[issue43423] Subprocess IndexError possible in _communicate

[Eryk Sun]

Eryk Sun <eryksun at gmail.com> added the comment:

The presumption I suppose is that these statements only execute if self.stdout_thread and/or self.stderr_thread completes successfully. I suppose that the read could fail or get canceled via CancelSynchronousIo(). Of course in that case you have a bigger problem than an IndexError.

On a related note, _communicate() needs significant changes in Windows. See bpo-43346 if you're interested.

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components: +Windows
nosy: +eryksun, paul.moore, steve.dower, tim.golden, zach.ware

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