New submission from Masahiro Sakai <masahiro.sa...@gmail.com>:

I noticed that two Ctrl+C instead of one are required to terminate following 
program on macOS and Linux.
I guess that the first Ctrl+C is ignored inside one of the finalizers.

----
import os

def main():
    r, w = os.pipe()
    f_w = os.fdopen(w, "w")
    f_w.buffer.write(b"a" * 65536)
    f_w.buffer.write(b"b")

main()
----

----------
components: IO
messages: 362964
nosy: msakai
priority: normal
severity: normal
status: open
title: Two Ctrl+C is required to terminate when a pipe is blocking
type: behavior
versions: Python 3.6, Python 3.7, Python 3.8, Python 3.9

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39792>
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