Re: [PATCH 0/1] Fix hang in t5562, introduced in v2.21.0-rc1

> On Mon, Feb 18, 2019 at 10:06:21PM +0100, Ævar Arnfjörð Bjarmason wrote:
> >> But in our attempt to exit(), we try to "cleanup children" and that
> >> is what gets stuck.
> > 
> > I have not paid enough attention to this thread to say if this is dumb,
> > but just in case it's useful. For this class of problem where cleanup
> > bites you for whatever reason in Perl, you can sometimes use this:
> > 
> >     use POSIX ();
> >     POSIX::_exit($code);
> > 
> > This will call "exit" from "stdlib" instead of Perl's "exit". So go away
> > *now* and let the OS deal with the mess. Perl's will run around cleaning
> > up stuff, freeing memory, running destructors etc, all of which might
> > have side effects you don't want/care about, and might (as maybe in this
> > case?) cause some hang.
> 
> * Perl is running in foreground, so it cannot outlive test
>   case and spoil the subsequent ones.
> * From the dumps I have an impression that it waits
>   legitimately - there are other processes to wait for.
>   And anyway the waits happen before perl script comes to
>   its exit.
> 
> Though I am already convinced that I should have done the
> helper in C. Let's see when I have time to fix it.