bug#28176: 26.0.50; Emacs hangs on entering a specific article in gnus

[Eli Zaretskii]

> From: Sam Steingold <sds@gnu.org>
> Cc: 28176@debbugs.gnu.org
> Date: Mon, 21 Aug 2017 13:23:23 -0400
> 
> I have no idea how to reproduce this easily.
> It might work like this:
> start gnus
> open newsgroup "nntp+news.gwene.org:gwene.com.stackexchange.history"
> in *Summary* buffer, find article with subject
> "Why, in ancient battles, did being encircled mean defeat?"
> view it by hitting RET.

Can you show a backtrace when it hangs like that?