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

[Xu Chunyang]

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))'
    ~ $ emacs --version | head -1
    GNU Emacs 26.2.90
    ~ $


In GNU Emacs 26.2.90 (build 1, x86_64-apple-darwin18.6.0, Carbon Version 158 
AppKit 1671.5)
 of 2019-06-13 built on Chunyangs-MacBook-Air.local
Repository revision: 7ba854289bd169f1e5f4fbdbc4ae2bef24b9811f
Windowing system distributor 'Apple Inc.', version 10.14.5
Recent messages:
Loading /Users/xcy/.emacs.d/xcy.el (source)...done
Loading /Users/xcy/.emacs.d/var/recentf-save.el (source)...done
Cleaning up the recentf list...done (0 removed) [2 times]

Configured using:
 'configure --with-modules'

Configured features:
NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS MODULES THREADS LCMS2

Important settings:
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Major mode: Lisp Interaction

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Load-path shadows:
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/Users/xcy/src/emacs-mac/lisp/net/soap-client
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Memory information:
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