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From: Bize Ma <binaryzebra@gmail.com>
Newsgroups: gnu.bash.bug
Subject: Terminating background bash kills the parent?
Date: Thu, 20 Dec 2018 00:02:06 -0500
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Xref: csiph.com gnu.bash.bug:14933

Open a new terminal like xterm, change prompt to something like:

    PS1=' $SHLVL $ '

Start a couple of bash subshells:

    1 $ bash
    2 $ bash
    3 $ echo $$
    9371

Suspend the last one:

    3 $ suspend
    [1]+ Stopped                 bash
    2 $ echo $$
    9313
    2 $

Make the suspended shell continue:

    2 $ kill -CONT 9371

The parent gets killed

    1 $ echo $$
    9034
     1 $

Take a look at:
https://unix.stackexchange.com/questions/379507/weird-terminating-background-bash-kills-the-parent