On 27/05/2022 22:18, Ihor Radchenko wrote:
> Max Nikulin writes:
> 
>>> With this exact init.el, trying to run
>>> (let ((process-connection-type nil))
>>>     (start-process-shell-command "1" nil "xdg-open ~/.bashrc"))
>>
>> Does it mean that you can not reproduce it with emacsclient instead of
>> xdg-open? Anyway I can not reproduce it with Emacs-27.1 from
>> Ubuntu-20.04.
> 
> I have reported this to Emacs. The more precise steps are in
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=55672

As expected, nobody wishes to dig into obscure X11 issue.

You may try the attached patch. I do not consider it as unambiguous 
improvement since almost all errors are swallowed due to requirement to 
interpret viewer command using shell. The same approach settled on 
`browse-url' after several fixes, but there at least wrong executable 
name may be reported.

I suspect that you faced the bug working on another issue, so you do not 
really suffer from it.