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Re: master reporting "creating pipe: too many open files"

From: Stephen Leake
Subject: Re: master reporting "creating pipe: too many open files"
Date: Sat, 16 Jul 2022 14:58:37 -0700
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (windows-nt)

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Stephen Leake <stephen_leake@stephe-leake.org>
>> Date: Sat, 16 Jul 2022 09:58:18 -0700
>> I have a custom git front-end that works fine in emacs 28, but in
>> current emacs master it always reports "creating pipe: too many open
>> files" after a commands. Then any subsequent command in emacs that
>> requires a file (such as saving a buffer) also fails.
>> This is on Windows 8.1, emacs built with mingw64.
>> I'm guessing there is some file/process handle that is opened and not
>> closed.
>> I update my local copy of emacs master rarely, so this change happened
>> sometime since Dec 2021; I have not tried to bisect.
>> Attached is some simplified code that shows the problem; it runs a
>> subprocess the same way the git front-end does. To run, load the file,
>> then run M-x dd-test. On my system, master is ok with 10 processes,
>> fails with 100 (I did not bisect further). Emacs 28 is ok forever.
> 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'll do that.

I reported this as bug#56606

-- Stephe

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