[issue43308] subprocess.Popen leaks file descriptors opened for DEVNULL or PIPE stdin/stdout/stderr arguments

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[issue43308] subprocess.Popen leaks file descriptors opened for DEVNULL or PIPE stdin/stdout/stderr arguments

New submission from cptpcrd : TL;DR: subprocess.Popen's handling of file descriptors opened for DEVNULL or PIPE inputs/outputs has serious problems, and it can be coerced into leaking file descriptors in several ways. This can cause issues related to resource exhaustion. # The basic problem