bug#40023: 26.3; Emacs crashes when creating process if many file handles are in use (e.g., when using ccls)

[Holger Pirk]

Hi folks,

I use LSP/CCLS on a project with a lot of dependencies. When opening a
file, LSP asks me if I want to watch all of their files (I do). Now, when I try
to compile the project from within emacs, emacs simply crashes. I have
attached a debugger (lldb). Here is a trace of the session that should
illustrate what is happening:

(lldb) r
Process 30575 launched: '/usr/local/Cellar/emacs-plus/26.3/bin/emacs' (x86_64)
2020-03-11 13:37:18.644400+0000 emacs[30575:1729696] Failed to initialize color 
list unarchiver: Error Domain=NSCocoaErrorDomain Code=4864 "*** 
-[NSKeyedUnarchiver _initForReadingFromData:error:throwLegacyExceptions:]: 
non-keyed archive cannot be decoded by NSKeyedUnarchiver" 
UserInfo={NSDebugDescription=*** -[NSKeyedUnarchiver 
_initForReadingFromData:error:throwLegacyExceptions:]: non-keyed archive cannot 
be decoded by NSKeyedUnarchiver}
2020-03-11 13:37:20.444106+0000 emacs[30575:1729754] flock failed to lock maps 
file: errno = 35
2020-03-11 13:37:20.444386+0000 emacs[30575:1729754] flock failed to lock maps 
file: errno = 35
process.c:459: Emacs fatal error: assertion failed: fd >= 0 && fd < FD_SETSIZE
Process 30575 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
    #0: `__pthread_kill
libsystem_kernel.dylib`__pthread_kill:
->  0x7fff6ac5f7fa <+10>: jae    0x7fff6ac5f804            ; <+20>
    0x7fff6ac5f7fc <+12>: movq   %rax, %rdi
    0x7fff6ac5f7ff <+15>: jmp    0x7fff6ac59a89            ; cerror_nocancel
    0x7fff6ac5f804 <+20>: retq
Target 0: (emacs) stopped.
(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
  * #0: `__pthread_kill
    #1: `pthread_kill
    #2: `raise
    #3: `terminate_due_to_signal
    #4: `emacs_abort
    #5: `ns_term_shutdown
    #6: `shut_down_emacs
    #7: `terminate_due_to_signal
    #8: `die
    #9: `add_non_keyboard_read_fd at process.c:459
    #10: `add_process_read_fd at process.c:471
    #11: `create_process at process.c:2050
    #12: `Fmake_process at process.c:1920
    #13: `Ffuncall
    #14: `Fapply
    #15: `Ffuncall
    #16: `exec_byte_code
    #17: `Ffuncall
    #18: `Fapply
    #19: `Ffuncall
    #20: `exec_byte_code
    #21: `Ffuncall
    #22: `exec_byte_code
    #23: `Ffuncall
    #24: `exec_byte_code
    #25: `Ffuncall
    #26: `exec_byte_code
    #27: `Ffuncall
    #28: `exec_byte_code
    #29: `Ffuncall
    #30: `exec_byte_code
    #31: `Ffuncall
    #32: `exec_byte_code
    #33: `Ffuncall
    #34: `Ffuncall_interactively
    #35: `Ffuncall
    #36: `Fcall_interactively
    #37: `funcall_subr
    #38: `Ffuncall
    #39: `exec_byte_code
    #40: `Ffuncall
    #41: `call1
    #42: `command_loop_1
    #43: `internal_condition_case
    #44: `command_loop_2
    #45: `internal_catch
    #46: `command_loop
    #47: `recursive_edit_1
    #48: `Frecursive_edit
    #49: `main
    #50: `start
(lldb) f 9
#9: `add_non_keyboard_read_fd at process.c:459
   456  static void
   457  add_non_keyboard_read_fd (int fd)
   458  {
-> 459    eassert (fd >= 0 && fd < FD_SETSIZE);
   460    eassert (fd_callback_info[fd].func == NULL);
   461
   462    fd_callback_info[fd].flags &= ~KEYBOARD_FD;
(lldb) frame variable fd
(int) fd = 1805
(lldb) f 11
#11: `create_process at process.c:2050
   2047   pset_status (p, Qrun);
   2048
   2049   if (!EQ (p->command, Qt))
-> 2050     add_process_read_fd (inchannel);
   2051
   2052   /* This may signal an error.  */
   2053   setup_process_coding_systems (process);
(lldb) frame variable *p
(Lisp_Process) *p = {
  header = (size = 4611686018461020181, gcaligned = '\x15')
  tty_name = (i = 0)
  name = (i = 4664306260)
  command = (i = 4741329507)
  filter = (i = 28608)
  sentinel = (i = 28656)
  log = (i = 0)
  buffer = (i = 4664509813)
  childp = (i = 46464)
  plist = (i = 0)
  type = (i = 40944)
  mark = (i = 4664307705)
  status = (i = 42384)
  decode_coding_system = (i = 126929848)
  decoding_buf = (i = 4297587076)
  encode_coding_system = (i = 126929848)
  encoding_buf = (i = 4297587076)
  write_queue = (i = 0)
  gnutls_cred_type = (i = 0)
  gnutls_boot_parameters = (i = 0)
  stderrproc = (i = 0)
  thread = (i = 4302432989)
  pid = 0
  infd = 1805
  nbytes_read = 0
  outfd = 1805
  open_fd = ([0] = 1806, [1] = -1, [2] = 1805, [3] = -1, [4] = 1807, [5] = 1808)
  tick = 0
  update_tick = 0
  decoding_carryover = 0
  read_output_delay = 0
  adaptive_read_buffering = 1
  read_output_skip = false
  kill_without_query = false
  pty_flag = true
  inherit_coding_system_flag = false
  alive = false
  raw_status_new = false
  is_non_blocking_client = false
  is_server = false
  raw_status = 0
  backlog = 0
  port = 0
  socktype = 0
  gnutls_initstage = GNUTLS_STAGE_EMPTY
  gnutls_state = 0x0000000000000000
  gnutls_x509_cred = 0x0000000000000000
  gnutls_anon_cred = 0x0000000000000000
  gnutls_certificate = 0x0000000000000000
  gnutls_peer_verification = 0
  gnutls_extra_peer_verification = 0
  gnutls_log_level = 0
  gnutls_handshakes_tried = 0
  gnutls_p = false
  gnutls_complete_negotiation_p = false
}
(lldb)

I have spent some time digging around the code and couldn't quite figure
out the logic behind the `fd < FD_SETSIZE`-assert. I suspect the CCLS
opens files without going through emacs' infrastructure which leads to
high file descriptors which emacs cannot handle. I would say that CCLS
is, in part, to blame but emacs shouldn't simply crash.



In GNU Emacs 26.3 (build 2, x86_64-apple-darwin19.3.0, NS appkit-1894.30 
Version 10.15.3 (Build 19D76))
of 2020-03-11 built on veloceraptor.local
Windowing system distributor 'Apple', version 10.3.1894
Recent messages:
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For information about GNU Emacs and the GNU system, type C-h C-a.
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Configured using:
'configure --disable-dependency-tracking --disable-silent-rules
--enable-locallisppath=/usr/local/share/emacs/site-lisp
--infodir=/usr/local/Cellar/emacs-plus/26.3/share/info/emacs
--prefix=/usr/local/Cellar/emacs-plus/26.3 --with-xml2 --without-dbus
--with-gnutls --with-imagemagick --with-modules --with-rsvg --with-ns
--disable-ns-self-contained --enable-checking=yes,glyphs
--enable-check-lisp-object-type 'CFLAGS=-O0 -g' 'LDFLAGS=-O0 -g''

Configured features:
JPEG RSVG IMAGEMAGICK GLIB NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS NS MODULES THREADS LCMS2

Important settings:
  value of $LC_ALL: en_US.UTF-8
  value of $LANG: en_GB.UTF-8
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Major mode: Org

Minor modes in effect:
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  straight-use-package-mode: t
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  server-mode: t
  save-place-mode: t
  history-mode: t
  helm-mode: t
  helm--remap-mouse-mode: t
  global-subword-mode: t
  subword-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  global-prettify-symbols-mode: t
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  global-font-lock-mode: t
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Features:
(shadow sort mail-extr emacsbug sendmail winner helm-command helm-elisp
helm-eval edebug helm-info flyspell ispell org-ref org-ref-helm-bibtex
org-ref-helm helm-bibtex bibtex-completion biblio biblio-download
biblio-dissemin biblio-ieee biblio-hal biblio-dblp biblio-crossref
biblio-arxiv timezone biblio-doi biblio-core url-queue ido helm-net
browse-url xml org-ref-core reftex-cite reftex reftex-loaddefs
reftex-vars org-ref-glossary org-ref-bibtex org-ref-citeproc key-chord
doi-utils org-ref-utils org-ref-pdf url-http url-auth url-gw ol-bibtex
htmlize noxml-fold rng-nxml rng-valid nxml-mode nxml-outln nxml-rap
sgml-mode dom request autorevert url url-proxy url-privacy url-expand
url-methods url-history url-cookie url-domsuf mailcap company-prescient
prescient company cl elmacro ccls ccls-member-hierarchy
ccls-inheritance-hierarchy ccls-call-hierarchy ccls-tree ccls-code-lens
ccls-semantic-highlight ccls-common lsp lsp-ui-flycheck lsp-ui-doc
goto-addr lsp-ui-imenu lsp-ui-peek lsp-ui-sideline lsp-mode xref project
url-util tree-widget spinner network-stream nsm starttls markdown-mode
inline imenu ht filenotify f ewoc em-glob bindat lsp-ui flymake-cppcheck
flymake-easy flymake-proc flymake compile warnings helm-rg
ob-mathematica wolfram-mode smie eyebrowse hydra lv shackle trace pcase
spaceline-config spaceline-segments s spaceline powerline
powerline-separators powerline-themes org-eshell esh-var esh-io esh-cmd
esh-opt esh-ext esh-proc esh-arg esh-groups eshell esh-module esh-mode
esh-util org-gnus nnir gnus-sum gnus-group gnus-undo gnus-start
gnus-cloud nnimap nnmail mail-source tls gnutls utf7 netrc nnoo
parse-time gnus-spec gnus-int gnus-range message rmc puny rfc822 mml
mml-sec epa derived epg mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader gnus-win gnus nnheader gnus-util rmail
rmail-loaddefs rfc2047 rfc2045 ietf-drums mail-utils mm-util mail-prsvr
org-eww org-docview doc-view jka-compr image-mode dired dired-loaddefs
org-bibtex org-bbdb ample-light-theme ample-flat-theme ample-theme
dash-functional ebib ivy delsel colir color ivy-overlay
ebib-reading-list ebib-notes ebib-filters ebib-keywords ebib-utils
ebib-db parsebib pp crm bibtex ox-slimhtml ox-odt rng-loc rng-uri
rng-parse rng-match rng-dt rng-util rng-pttrn nxml-parse nxml-ns
nxml-enc xmltok nxml-util ox-latex ox-icalendar ox-html table ox-ascii
ox-publish ox org-element org ob ob-tangle ob-ref ob-lob ob-table
org-macro org-footnote org-src ob-comint org-pcomplete pcomplete comint
org-list org-faces org-entities noutline outline org-version
ob-emacs-lisp org-table org-keys org-loaddefs cal-menu calendar
cal-loaddefs avl-tree generator ol ob-exp ob-core org-compat ob-eval
org-macs fringe-current-line cc-mode cc-fonts cc-guess cc-menus cc-cmds
cc-styles cc-align cc-engine cc-vars cc-defs window-purpose
window-purpose-fixes window-purpose-prefix-overload
window-purpose-switch let-alist window-purpose-layout ring
window-purpose-core window-purpose-configuration window-purpose-utils
yasnippet-snippets yasnippet elec-pair cus-edit wid-edit flycheck
ansi-color json map find-func rx dash helm-config helm-easymenu
async-bytecomp use-package-bind-key bind-key use-package-ensure
use-package-core use-package-autoloads bind-key-autoloads
straight-autoloads cl-extra help-mode straight subr-x server saveplace
history thingatpt helm-mode helm-files helm-buffers helm-occur helm-tags
helm-locate helm-grep helm-regexp format-spec helm-utils helm-help
helm-types helm easy-mmode edmacro kmacro helm-source eieio-compat
helm-multi-match helm-lib advice async cap-words superword subword
hl-line cus-start cus-load finder-inf tex-site info package easymenu
epg-config url-handlers url-parse auth-source cl-seq eieio eieio-core
cl-macs eieio-loaddefs password-cache url-vars seq byte-opt gv bytecomp
byte-compile cconv cl-loaddefs cl-lib time-date tooltip eldoc electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel term/ns-win ns-win
ucs-normalize mule-util term/common-win tool-bar dnd fontset image
regexp-opt fringe tabulated-list replace newcomment text-mode elisp-mode
lisp-mode prog-mode register page menu-bar rfn-eshadow isearch timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic 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 charscript charprop case-table epa-hook jka-cmpr-hook
help simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote threads kqueue cocoa ns lcms2 multi-tty make-network-process
emacs)

Memory information:
((conses 16 634628 326410)
(symbols 48 60322 2)
(miscs 40 112 560)
(strings 32 163812 50088)
(string-bytes 1 5593472)
(vectors 16 90885)
(vector-slots 8 1338691 257952)
(floats 8 577 798)
(intervals 56 734 167)
(buffers 992 13))