Subject: bug#39075: 28.0.50; Emacs hangs on 100% CPU and grows beyond bounds in shell-mode

From: Eli Zaretskii <[email-masked]>
Date: Sat, 11 Jan 2020 11:59:37 +0200

> Date: Fri, 10 Jan 2020 22:16:58 +0100
> From: Pieter van Oostrum <[email-masked]>
> 
> 1) Emacs -Q
> 2) M-x shell
> 3) type some command, and use some filename completions on the way
> (using TAB).
> 4) Type a semicolon (;)
> 
> Now Emacs hangs, the ; does not appear, and it doesn't react to a C-g typed.
> It uses 100% CPU and memory grows beyond bounds, eventually just making
> my whole computer unresponsive.

I cannot reproduce this on GNU/Linux, so it's probably macOS-specific.