[Bug 12176] New: kill signal not delivered until subshell exits

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=12176

            Bug ID: 12176
           Summary: kill signal not delivered until subshell exits
           Product: Busybox
           Version: 1.28.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Standard Compliance
          Assignee: unassigned at busybox.net
          Reporter: mavik at live.com.au
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

I've found that a signal from kill is not delivered from a subshell until the
subshell completes:

eg.

FUNCTION()
{
    kill $1
    sleep 1
    ps | grep $1
}

When called as follows, as expected the backgrounded process is killed by
FUNCTION():

# while true; do sleep 1; done &
# echo $!
26276
# FUNCTION 26276
26624 root      4164 S    grep 26276
[1]+  Terminated                 while true; do sleep 1; done
#

But when called in a subshell, the background process doesn't appear to be
killed until the subshell returns:

# while true; do sleep 1; done &
# echo $!
29632
# ret=$(FUNCTION 29632) 
[1]+  Terminated                 while true; do sleep 1; done
# echo "$ret"
29632 root         0 Z    [sh]
31456 root      4164 S    grep 29632

Is that expected behaviour?

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