bug#24201: 25.1.50; TLS connections sometimes hang

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: eggert@cs.ucla.edu,  24201@debbugs.gnu.org
> Date: Mon, 19 Feb 2018 20:06:46 +0100
> 
> Hm...  actually, I don't know.  I say "cont" and then break it again,
> and it says that it's in a pthread_sigmask call, but I don't know
> whether it's the same one...
> 
> The process has unfortunately exited now, but the next time this
> happens, what's the best way to debug what's going on?  I'm not very
> well versed in gdb usage.

The best way is to start typing "finish" until it doesn't return from
the frame.  See the instructions in etc/DEBUG starting at "If Emacs is
in an infinite loop".  If something in the instructions is unclear,
please don't hesitate asking.