https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228728
Bug ID: 228728
Summary: sh does not reap killed background processes until
terminal activity, creating zombies
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: bin
Assignee: b...@freebsd.org
Reporter: mqu...@neosmart.net
The default `sh` shell does not reap backgrounded processes if sitting idle,
and killed backgrounded processes are not reaped until a new command is
executed or enter is pressed at the tty.
For example,
```
$ cat
<CTRL-Z>
[1] + Suspended cat
$
```
Now in another terminal or in an SSH session:
```
$ killall -9 cat
```
The PID associated with cat is turned into a zombie as the shell does not reap
the killed instance. The only way to trigger reaping would be to attach to the
tty session where the process was initially backgrounded and hit <ENTER>:
```
$ cat
# resuming from first segment above
$ <ENTER>
[1] Killed cat
$
```
Solution: `waitpid(2)` should be used to asynchronously detect the exit of
backgrounded child processes.
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