bug#73046: 29.4; Emacs 100% CPU usage for several seconds when opening dired buffer over TRAMP

[Suhail Singh <suhailsingh247@gmail.com>]

Eli Zaretskii <eliz@gnu.org> writes:

>> The version of `ls' on this host is:
>> 
>> #+begin_quote
>>   ls (GNU coreutils) 8.32
>>   Copyright (C) 2020 Free Software Foundation, Inc.
>>   License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
>>   This is free software: you are free to change and redistribute it.
>>   There is NO WARRANTY, to the extent permitted by law.
>> 
>>   Written by Richard M. Stallman and David MacKenzie.
>> #+end_quote
>
> This cannot be true: the --dired option was added to 'ls' way earlier.
> I have Coreutils 6.9 from 2007 on one of my systems, and --dired is
> supported there.  To see if it is supported, try this:
>
>   $ ls -al --dired
>
> You should see 2 extra lines of output after the listing, each one
> starting with "//DIRED".

I understand that said version should have had --dired support, but
that's not what I observed.  Regardless, I got the sysadmin to do an
upgrade and now `ls --dired' is giving the expected output.  However,
the performance issues still persist and continue to be reproducible on
my end via emacs -Q.

-- 
Suhail