commands following asynchronous list are executed twice

From	Oğuz <oguzismailuysal@gmail.com>
Newsgroups	gnu.bash.bug
Subject	commands following asynchronous list are executed twice
Date	2020-04-02 15:09 +0300
Message-ID	<mailman.15.1585829370.2644.bug-bash@gnu.org> (permalink)
References	<CAH7i3LqCeSt-v=pYBVMXPNC3Ycs3sVMugTxP2mxx-v2MW=RCig@mail.gmail.com>

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While reading commands from stdin, if job controls are enabled,
commands following an asynchronous list in `{ cmd; } &` fashion are
executed twice. See below extract:

$ bash -m <<\EOD
{ sleep 1; } &
wait
echo $BASHPID
EOD
10615
10615

When job controls are disabled, or an external utility is called in
the same line this behavior disappears. E.g.:

$ bash -m <<\EOD
{ sleep 1; } & x
wait
echo $BASHPID
EOD
./bash: line 1: x: command not found
10618

This is reproducible on 4.4.20(1)-release, 5.0.11(1)-release and 5.0.16(1)-maint

-- 
Oğuz

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commands following asynchronous list are executed twice Oğuz <oguzismailuysal@gmail.com> - 2020-04-02 15:09 +0300

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