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From: Daniel Mills <danielmills1@gmail.com>
Newsgroups: gnu.bash.bug
Subject: INT still propagating to child processes when trapped
Date: Tue, 10 Jul 2018 22:59:16 -0400
Lines: 45
Approved: bug-bash@gnu.org
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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-unknown-linux-gnu'
-DCONF_VENDOR='unknown' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash'
-DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib  -D_FORTIFY_SOURCE=2
-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -fno-plt
-DDEFAULT_PATH_VALUE='/usr/local/sbin:/usr/local/bin:/usr/bin'
-DSTANDARD_UTILS_PATH='/usr/bin' -DSYS_BASHRC='/etc/bash.bashrc'
-DSYS_BASH_LOGOUT='/etc/bash.bash_logout' -DNON_INTERACTIVE_LOGIN_SHELLS
-Wno-parentheses -Wno-format-security
uname output: Linux djdev 4.17.5-1-ARCH #1 SMP PREEMPT Sun Jul 8 17:27:31
UTC 2018 x86_64 GNU/Linux
Machine Type: x86_64-unknown-linux-gnu

Bash Version: 4.4
Patch Level: 23
Release Status: release

Description:
 After an INT trap, forked processes are still sent INT when ^C is used on
a running script.

Repeat-By:

#!/bin/bash
{
  trap 'echo "foo :("' EXIT
  sleep 30
  echo foo
} & foo=$!
{
  trap 'echo "bar :("' EXIT
  sleep 32
  echo bar
} & bar=$!
trap 'kill "$foo"' INT
read
sleep 60
###################################

Run this script in bash 3.x and hit ^C, and you get "foo :(", as expected.
Run it with bash 4.4, and you also get "bar :(". I would not expect this.