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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Newsgroups: gnu.bash.bug
Subject: Re: process substitution fd lifetime race condition
Date: Mon, 20 Apr 2020 15:49:50 -0600
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Xref: csiph.com gnu.bash.bug:16205

This one will reproduce immediately:

#!/bin/bash
set -e
a="my name is a"
b="my name is b"
sleep() { read -t "$1" -N 1 || true; }
doit() { sleep 0.1; "$@"; }
while true; do
   doit cat <(echo "$a") <(echo "$b")
done