bug#24201: 25.1.50; TLS connections sometimes hang

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: 24201@debbugs.gnu.org
> Date: Sun, 07 Jul 2019 20:13:13 +0200
> 
> Lars Ingebrigtsen <larsi@gnus.org> writes:
> 
> > I'll add some instrumentation to that function now and try to figure out
> > why it's not heeding the timeout.  It's so annoying that I haven't been
> > able to make a simple test case to reproduce the error, though, because
> > the hang only happens once every few hours...
> 
> Amusingly enough, after adding some fprintfs to the function, I haven't
> seen a single hang.  :-/

Maybe add only one fprintf (assuming doing that doesn't make the
problem go away), then move it around to see the control flow.  It's
less convenient and more time-consuming, but maybe there's no better
alternative.