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

[Stephen Leake <stephen_leake@stephe-leake.org>]

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On Windows, load the attached file:

M-x load-file debug-process.el

It signals an error, with the message "Creating pipe: Too many open
files".

On Debian the error does not happen. In Emacs 28, and in emacs master
in December 2021, the error does not happen.


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In GNU Emacs 29.0.50 (build 2, x86_64-w64-mingw32)
 of 2022-07-16 built on TAKVER4
Repository revision: 35d0a2e0a767838c24d5853be798313aed7a42df
Repository branch: master
Windowing system distributor 'Microsoft Corp.', version 6.3.9600
System Description: Microsoft Windows 8.1 Pro (v6.3.0.9600.20478)

Configured using:
 'configure
PKG_CONFIG_PATH=/mingw64/lib/pkgconfig:/mingw64/share/pkgconfig'

Configured features:
ACL DBUS GIF GMP GNUTLS HARFBUZZ JPEG JSON LCMS2 LIBXML2 MODULES NOTIFY
W32NOTIFY PDUMPER PNG RSVG SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS WEBP XPM ZLIB

Important settings:
  value of $LC_CTYPE: en_US.UTF-8
  value of $LANG: ENU
  locale-coding-system: cp1252

Major mode: Summary

Minor modes in effect:
  debbugs-browse-mode: t
  bug-reference-mode: t
  display-time-mode: t
  delete-selection-mode: t
  icomplete-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow emacsbug mailalias smerge-mode diff canlock bbdb-message
gnus-kill mule-util sort smiley gnus-cite flow-fill mm-archive mail-extr
textsec uni-scripts idna-mapping ucs-normalize uni-confusable
textsec-check gnus-async gnus-bcklg qp gnus-ml vc-mtn vc-git diff-mode
vc vc-dispatcher debbugs-browse bug-reference utf-7 imap rfc2104 nndraft
nnmh gnus-agent gnus-srvr gnus-score score-mode nnvirtual gnus-msg nnml
gnus-cache bbdb-gnus network-stream nsm nntp gnus-art mm-uu mml2015
mm-view mml-smime smime gnutls dig gnus-sum shr pixel-fill kinsoku
url-file url-dired svg dom gnus-group gnus-undo gnus-start gnus-dbus
dbus xml gnus-cloud nnimap nnmail mail-source utf7 netrc nnoo parse-time
iso8601 gnus-spec gnus-int gnus-range gnus-win gnus wid-edit nnheader
range message yank-media puny rfc822 mml mml-sec epa epg rfc6068
epg-config gnus-util time-date mm-decode mm-bodies mm-encode mail-parse
rfc2231 gmm-utils mailheader bbdb-mua bbdb-com pcase crm mailabbrev bbdb
derived bbdb-site timezone smtpmail sendmail rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mail-utils time delsel cus-load stephe-theme noutline
outline easy-mmode path-iterator cl-extra help-mode whitespace dired-x
dired-aux dired dired-loaddefs compile text-property-search comint
ansi-color uniquify-files icomplete xref project ring info package
browse-url url url-proxy url-privacy url-expand url-methods url-history
url-cookie generate-lisp-file url-domsuf url-util mailcap url-handlers
url-parse auth-source cl-seq eieio eieio-core cl-macs password-cache
json subr-x map byte-opt gv bytecomp byte-compile cconv url-vars
cl-loaddefs cl-lib rmc iso-transl tooltip eldoc paren electric uniquify
ediff-hook vc-hooks lisp-float-type elisp-mode mwheel dos-w32 ls-lisp
disp-table term/w32-win w32-win w32-vars term/common-win tool-bar dnd
fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow
isearch easymenu timer select scroll-bar mouse jit-lock font-lock syntax
font-core term/tty-colors frame minibuffer nadvice seq simple cl-generic
indonesian philippine cham georgian utf-8-lang misc-lang vietnamese
tibetan thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
composite emoji-zwj charscript charprop case-table epa-hook
jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button loaddefs
faces cus-face macroexp files window text-properties overlay sha1 md5
base64 format env code-pages mule custom widget keymap
hashtable-print-readable backquote threads w32notify dbusbind w32 lcms2
multi-tty make-network-process emacs)

Memory information:
((conses 16 366274 36249)
 (symbols 48 19973 3)
 (strings 32 79351 4442)
 (string-bytes 1 2356349)
 (vectors 16 59637)
 (vector-slots 8 1148125 74030)
 (floats 8 284 234)
 (intervals 56 2094 329)
 (buffers 992 28))

-- 
-- Stephe