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From: Grisha Levit <grishalevit@gmail.com>
Newsgroups: gnu.bash.bug
Subject: SIGINT and process substitution leakage
Date: Sat, 21 Sep 2019 19:21:28 -0400
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Xref: csiph.com gnu.bash.bug:15399

Running the below a few times results in a stray child bash process
(and a borked terminal, as the child will still read from the same
tty):

    kill -INT -$$ & while :; do : <(:); done

This seems to have started with bash-20150724 [1] and is present in
the current devel branch.

[1] https://git.savannah.gnu.org/cgit/bash.git/commit/?h=devel&id=7afeb718cb55ab9f224936a2b58cde07559eb59f