bug#49449: 28: TLS connection never gets to "open" stage

[Eli Zaretskii]

> From: Mattias Engdegård <mattiase@acm.org>
> Date: Sat, 10 Jul 2021 21:22:09 +0200
> Cc: larsi@gnus.org, 49449@debbugs.gnu.org
> 
> 10 juli 2021 kl. 20.54 skrev Eli Zaretskii <eliz@gnu.org>:
> 
> > The busy-wait loop can delay the sentinel call, but do you understand
> > why the sentinel isn't called once the loop is over?
> 
> Sort of; see previous discussion. In short: once the busy-wait loop is over, 
> the TLS handshake succeeds immediately (because sufficient time has passed) 
> but the logic isn't set up for this path and enters a state where the 
> sentinel cannot be called.

That's my question: why cannot the sentinel be called in this case?
what prevents it from being called?  Apologies if I missed the
explanation, and could you please repeat it?