Within a command substitution that's a part of a heredoc, if you start a job at the background and then attempt to run an external command, Ctrl+C, Ctrl+Z, and Ctrl+\ won't work.
$ cat <<<`sleep 10 & uname`
bash: warning: 6031: maybe_give_terminal_to: terminal pgrp == 6030
shell pgrp = 6024 new pgrp = 6033 in_background = 0
^C^C^CLinux
$
I should've tested and reported this before the patch was released, sorry :/
Oğuz
