GNU bug report logs - #56606
29.0.50; recent master fails with "creating pipe: too many open files"

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Stephen Leake <stephen_leake <at> stephe-leake.org>
Cc: 56606 <at> debbugs.gnu.org
Subject: bug#56606: Acknowledgement (29.0.50; recent master fails with "creating pipe: too many open files")
Date: Sun, 17 Jul 2022 13:20:12 +0300

> From: Stephen Leake <stephen_leake <at> stephe-leake.org>
> Date: Sun, 17 Jul 2022 02:42:04 -0700
> 
> On emacs-devel, Eli said:
> 
> AFAICT, this loop in deactivate_process:
> 
>   /* Beware SIGCHLD hereabouts.  */
> 
>   for (i = 0; i < PROCESS_OPEN_FDS; i++)
>     close_process_fd (&p->open_fd[i]);
> 
> doesn't close the last of the 4 descriptors opened by the 2 emacs_pipe
> calls in make-pipe-process.  It calls 'close' with the right value,
> and close returns zero, but the pipe stays open.  In Emacs 28, this
> same loop successfully closes the descriptor.  I don't know why.
> 
> Perhaps bisecting could help.

I think commit a81669c could be the culprit.

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