bug#39413: 26.2; Emacs gets hung

[Eli Zaretskii]

> From: chiaki-ishikawa-thunderbird-account <chiaki.ishikawa@ubin.jp>
> Date: Tue, 4 Feb 2020 18:32:30 +0900
> 
> I have been using emacs-26.2 for a while and noticed
> a few lockups for the last few months.
> 
> I had not seen emacs lockups for quite a while (I have used GNU Emacs
> since 1[678] days.)
> 
> The recent lockup occurred just yesterday while I was editing C++
> source files. I was about to enter (or have entered) the second '/' to
> start a comment and then '/' is not echoed back and emacs locked up.

Please try the latest emacs-27 branch of the Emacs Git repository, it
is quite possible that this problem was fixed there.  If not, we will
appreciate a minimal example of a file and sequence of commands to
type in order to reproduce the problem.

Thanks.