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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: memory leaks
Date: Tue, 10 Nov 2020 17:16:12 +0200
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In-Reply-To: <m3y2ja9f6f.fsf@leonis4.robolove.meer.net> (message from Madhu on
 Tue, 10 Nov 2020 06:54:56 +0530)
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> From: Madhu <enometh@meer.net>
> Date: Tue, 10 Nov 2020 06:54:56 +0530
> Cc: 43395@debbugs.gnu.org
> 
> #+BEGIN_SRC
> $ cat > f.c
> #include <stdio.h>
> int
> main()
> {
>   char c = ' ';
>   while (c != 'q' && c != 'Q')
>     {
>       fprintf(stdout, "Press q then enter to quit: ");
>       c = fgetc(stdin);
>     }
>   return 0;
> }
> ^D
> 
> $ gcc f.c
> $ emacs -Q
> #+END_SRC
> 
> M-x shell-command ./a.out
> 
> Then the process hangs. But Emacs' memory grows unbounded.

Short answer: you use a command that cannot handle this case.  For the
details, please refer to the bug tracker.