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My script makes a defunct subshell and sticks on read

From: Øyvind Hvidsten
Subject: My script makes a defunct subshell and sticks on read
Date: Tue, 30 Jan 2018 21:04:48 +0100
User-agent: Cathedral Secure Mail v0.8

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' -DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H -I. -I../. -I.././include -I.././lib -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -fdebug-prefix-map=/build/bash-7fckc0/bash-4.4=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -no-pie -Wno-parentheses -Wno-format-security uname output: Linux vampiric 4.9.0-4-amd64 #1 SMP Debian 4.9.51-1 (2017-09-28) x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 4.4
Patch Level: 12
Release Status: release

Running the included script, which does nothing useful but is cut down a lot to demonstrate the issue, my main computer (amd64 based) counts to several million, then Bash stops responding, using 100% cpu and ends up with a defunct subshell. On my Raspberry Pi, running Raspbian Stretch and the same version of Bash (4.4.12), the same thing happens after only a few thousand iterations.

for ((i=0; ; i++)); do ((i%100)) || echo $i; exec {fd}<> >(:); read -t 0.001 -u $fd; exec {fd}>&-; done

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