bug#36279: 26.2.90; (process-attributes nonexistent-pid) segmentation fault

[Eli Zaretskii]

> From: Xu Chunyang <mail@xuchunyang.me>
> Date: Tue, 18 Jun 2019 21:25:40 +0800
> 
> Emacs crashes when I run the following (the PID 123456 doesn't exist)
> 
>     (process-attributes 123456)
> 
> And I can reproduce it from Emacs -Q:
> 
>     ~ $ emacs -Q --batch --eval '(print (process-attributes 123456))'
>     Fatal error 11: Segmentation faultzsh: segmentation fault  emacs -Q 
> --batch --eval '(print (process-attributes 123456))'

This seems to be Darwin-specific.