bug#50641: 28.0.50; Crash on macOS

[Alan Third]

On Fri, Sep 17, 2021 at 04:10:02PM +0200, Kirill A. Korinsky via Bug reports 
for GNU Emacs, the Swiss army knife of text editors wrote:
> It just crashed with stacktrace. Uptime was a day or so.
> 
> Stacktrace: https://gist.github.com/catap/2f5e98088fbbab5ae6da0bc0e29dcbf4

It looks like the crash is in deep in AppKit's menu code. Are you
doing anything with menus when it crashes?

The trace also shows that there are more than 512 function calls,
that's quite a lot but I don't think this is a stack overflow, as the
error would probably mention that...
-- 
Alan Third