GNU bug report logs - #47861
Starting `jsonrpc-process-connection' over Tramp fails if the process writes to stderr

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From: Jim Porter <jporterbugs <at> gmail.com>
To: 47861 <at> debbugs.gnu.org
Subject: bug#47861: Starting `jsonrpc-process-connection' over Tramp fails if the process writes to stderr
Date: Sat, 17 Apr 2021 20:53:37 -0700

When starting a `jsonrpc-process-connection' over Tramp, if the
process writes to stderr, Emacs (usually) fails with `Wrong type
argument: "inserted-chars 204"'. I'm able to reproduce this pretty
consistently when connecting from an MS Windows client to a Linux
server; however, this may apply to other platform combinations as
well. Mysteriously, it works fine about 1 in 10 times, though I
haven't been able to decipher why.

This is a reduced test case from an eglot issue that prevents users
from using eglot with clangd over Tramp (or likely any LSP server that
writes to stderr): <https://github.com/joaotavora/eglot/issues/662>.
Michael Albinus has a workaround for this for the next version of
Tramp (2.5.0.4, I believe), but suggested I file an issue here to help
find a more-permanent solution.

The following recipe reproduces the issue for me on both Emacs 27.2
and the prebuilt Emacs 28 snapshot from 2021-01-15. `jsonrpc-minimal'
is a cut-down version of `eglot--connect'. Note that this test tries
to run `clangd', but any executable that writes to stderr on startup
should reproduce this issue (including a nonexistent executable).
After running "emacs -Q":

----------[ Eval the following ]----------
;; Optional: disable ControlMaster if using ssh on Win32; it doesn't work there.
(require 'tramp)
(setq tramp-use-ssh-controlmaster-options nil)

(require 'jsonrpc)
(defun jsonrpc-minimal ()
  (interactive)
  (make-instance
   'jsonrpc-process-connection
   :name "jsonrpc-minimal"
   :process (lambda ()
              (make-process
               :name "jsonrpc-minimal"
               :command '("sh" "-c" "stty raw > /dev/null; clangd")
               :connection-type 'pipe
               :coding 'utf-8-emacs-unix
               :noquery t
               :stderr (get-buffer-create "*jsonrpc-minimal stderr*")
               :file-handler t))))
----------[ End ]----------

Then run `C-x C-f /sshx:server:~/path/to/file.txt RET' followed by
`M-x jsonrpc-minimal'. (Other Tramp methods such as plink should also
reproduce this issue.) If `debug-on-error' is set, I get the following
backtrace:

----------[ Begin backtrace ]----------
  signal(wrong-type-argument ("inserted-chars 204"))
  tramp-signal-hook-function(wrong-type-argument ("inserted-chars 204"))
  signal(wrong-type-argument ("inserted-chars 204"))
  tramp-handle-insert-file-contents("/sshx:server:/tmp/tramp.lLZT4H"
nil nil nil nil)
  apply(tramp-handle-insert-file-contents
("/sshx:server:/tmp/tramp.lLZT4H" nil nil nil nil))
  tramp-sh-file-name-handler(insert-file-contents
"/sshx:server:/tmp/tramp.lLZT4H" nil nil nil nil)
  apply(tramp-sh-file-name-handler insert-file-contents
("/sshx:server:/tmp/tramp.lLZT4H" nil nil nil nil))
  tramp-file-name-handler(insert-file-contents
"/sshx:server:/tmp/tramp.lLZT4H" nil nil nil nil)
  insert-file-contents("/sshx:server:/tmp/tramp.lLZT4H" nil nil nil nil)
  insert-file-contents-literally("/sshx:server:/tmp/tramp.lLZT4H")
  tramp-sh-handle-make-process(:name "jsonrpc-minimal" :command ("sh"
"-c" "stty raw > /dev/null; clangd") :connection-type pipe :coding
utf-8-emacs-unix :noquery t :stderr #<buffer *jsonrpc-minimal stderr*>
:file-handler t)
  apply(tramp-sh-handle-make-process (:name "jsonrpc-minimal" :command
("sh" "-c" "stty raw > /dev/null; clangd") :connection-type pipe
:coding utf-8-emacs-unix :noquery t :stderr #<buffer *jsonrpc-minimal
stderr*> :file-handler t))
  tramp-sh-file-name-handler(make-process :name "jsonrpc-minimal"
:command ("sh" "-c" "stty raw > /dev/null; clangd") :connection-type
pipe :coding utf-8-emacs-unix :noquery t :stderr #<buffer
*jsonrpc-minimal stderr*> :file-handler t)
  apply(tramp-sh-file-name-handler make-process (:name
"jsonrpc-minimal" :command ("sh" "-c" "stty raw > /dev/null; clangd")
:connection-type pipe :coding utf-8-emacs-unix :noquery t :stderr
#<buffer *jsonrpc-minimal stderr*> :file-handler t))
  tramp-file-name-handler(make-process :name "jsonrpc-minimal"
:command ("sh" "-c" "stty raw > /dev/null; clangd") :connection-type
pipe :coding utf-8-emacs-unix :noquery t :stderr #<buffer
*jsonrpc-minimal stderr*> :file-handler t)
  make-process(:name "jsonrpc-minimal" :command ("sh" "-c" "stty raw >
/dev/null; clangd") :connection-type pipe :coding utf-8-emacs-unix
:noquery t :stderr #<buffer *jsonrpc-minimal stderr*> :file-handler t)
  (closure (t) nil (make-process :name "jsonrpc-minimal" :command
'("sh" "-c" "stty raw > /dev/null; clangd") :connection-type 'pipe
:coding 'utf-8-emacs-unix :noquery t :stderr (get-buffer-create
"*jsonrpc-minimal stderr*") :file-handler t))()
  #f(compiled-function (cl--cnm conn slots) #<bytecode
0x18017ea42140ed74>)(#f(compiled-function (&rest cnm-args) #<bytecode
0x69ccf178fb9f2f9>) #<jsonrpc-process-connection
jsonrpc-process-connection-192d52c> (:name "jsonrpc-minimal" :process
(closure (t) nil (make-process :name "jsonrpc-minimal" :command '("sh"
"-c" "stty raw > /dev/null; clangd") :connection-type 'pipe :coding
'utf-8-emacs-unix :noquery t :stderr (get-buffer-create
"*jsonrpc-minimal stderr*") :file-handler t))))
  apply(#f(compiled-function (cl--cnm conn slots) #<bytecode
0x18017ea42140ed74>) #f(compiled-function (&rest cnm-args) #<bytecode
0x69ccf178fb9f2f9>) (#<jsonrpc-process-connection
jsonrpc-process-connection-192d52c> (:name "jsonrpc-minimal" :process
(closure (t) nil (make-process :name "jsonrpc-minimal" :command '("sh"
"-c" "stty raw > /dev/null; clangd") :connection-type 'pipe :coding
'utf-8-emacs-unix :noquery t :stderr (get-buffer-create
"*jsonrpc-minimal stderr*") :file-handler t)))))
  #f(compiled-function (&rest args) #<bytecode
0x101ee737e4a4203a>)(#<jsonrpc-process-connection
jsonrpc-process-connection-192d52c> (:name "jsonrpc-minimal" :process
(closure (t) nil (make-process :name "jsonrpc-minimal" :command '("sh"
"-c" "stty raw > /dev/null; clangd") :connection-type 'pipe :coding
'utf-8-emacs-unix :noquery t :stderr (get-buffer-create
"*jsonrpc-minimal stderr*") :file-handler t))))
  apply(#f(compiled-function (&rest args) #<bytecode
0x101ee737e4a4203a>) #<jsonrpc-process-connection
jsonrpc-process-connection-192d52c> (:name "jsonrpc-minimal" :process
(closure (t) nil (make-process :name "jsonrpc-minimal" :command '("sh"
"-c" "stty raw > /dev/null; clangd") :connection-type 'pipe :coding
'utf-8-emacs-unix :noquery t :stderr (get-buffer-create
"*jsonrpc-minimal stderr*") :file-handler t))))
  initialize-instance(#<jsonrpc-process-connection
jsonrpc-process-connection-192d52c> (:name "jsonrpc-minimal" :process
(closure (t) nil (make-process :name "jsonrpc-minimal" :command '("sh"
"-c" "stty raw > /dev/null; clangd") :connection-type 'pipe :coding
'utf-8-emacs-unix :noquery t :stderr (get-buffer-create
"*jsonrpc-minimal stderr*") :file-handler t))))
  #f(compiled-function (class &rest slots) "Default constructor for
CLASS `eieio-default-superclass'.\nSLOTS are the initialization slots
used by `initialize-instance'.\nThis static method is called when an
object is constructed.\nIt allocates the vector used to represent an
EIEIO object, and then\ncalls `initialize-instance' on that object."
#<bytecode -0x1cebd9ffedfcea53>)(jsonrpc-process-connection :name
"jsonrpc-minimal" :process (closure (t) nil (make-process :name
"jsonrpc-minimal" :command '("sh" "-c" "stty raw > /dev/null; clangd")
:connection-type 'pipe :coding 'utf-8-emacs-unix :noquery t :stderr
(get-buffer-create "*jsonrpc-minimal stderr*") :file-handler t)))
  apply(#f(compiled-function (class &rest slots) "Default constructor
for CLASS `eieio-default-superclass'.\nSLOTS are the initialization
slots used by `initialize-instance'.\nThis static method is called
when an object is constructed.\nIt allocates the vector used to
represent an EIEIO object, and then\ncalls `initialize-instance' on
that object." #<bytecode -0x1cebd9ffedfcea53>)
jsonrpc-process-connection (:name "jsonrpc-minimal" :process (closure
(t) nil (make-process :name "jsonrpc-minimal" :command '("sh" "-c"
"stty raw > /dev/null; clangd") :connection-type 'pipe :coding
'utf-8-emacs-unix :noquery t :stderr (get-buffer-create
"*jsonrpc-minimal stderr*") :file-handler t))))
  make-instance(jsonrpc-process-connection :name "jsonrpc-minimal"
:process (closure (t) nil (make-process :name "jsonrpc-minimal"
:command '("sh" "-c" "stty raw > /dev/null; clangd") :connection-type
'pipe :coding 'utf-8-emacs-unix :noquery t :stderr (get-buffer-create
"*jsonrpc-minimal stderr*") :file-handler t)))
  jsonrpc-minimal()
  funcall-interactively(jsonrpc-minimal)
  call-interactively(jsonrpc-minimal record nil)
  command-execute(jsonrpc-minimal record)
  execute-extended-command(nil "jsonrpc-minimal" "jsonrpc-minimal")
  funcall-interactively(execute-extended-command nil "jsonrpc-minimal"
"jsonrpc-minimal")
  call-interactively(execute-extended-command nil nil)
  command-execute(execute-extended-command)
----------[ End backtrace ]----------

----------[ Begin Emacs debug info ]----------
In GNU Emacs 28.0.50 (build 1, x86_64-w64-mingw32)
 of 2021-01-15 built on CIRROCUMULUS
Repository revision: f45be48ddbde00610e1e08fca6590dcf24a4e1b5
Repository branch: master
Windowing system distributor 'Microsoft Corp.', version 10.0.19041
System Description: Microsoft Windows 10 Pro (v10.0.2004.19041.928)

Configured using:
 'configure --without-dbus --without-compress-install -C 'CFLAGS=-O2
 -static -g3' PKG_CONFIG_PATH=/mingw64/lib/pkgconfig'

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

Important settings:
  value of $LANG: ENU
  locale-coding-system: cp1252

Major mode: Fundamental

Minor modes in effect:
  shell-dirtrack-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny dired dired-loaddefs
rfc822 mml mml-sec epa derived epg epg-config gnus-util rmail
rmail-loaddefs text-property-search mm-decode mm-bodies mm-encode
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tramp-loaddefs trampver tramp-integration files-x tramp-compat shell
pcomplete comint ansi-color ring parse-time iso8601 format-spec
auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs
password-cache json map seq byte-opt gv bytecomp byte-compile cconv
time-date subr-x cl-loaddefs cl-lib iso-transl tooltip eldoc electric
uniquify ediff-hook vc-hooks lisp-float-type 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 elisp-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors frame minibuffer 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
cl-preloaded nadvice button loaddefs faces cus-face macroexp files
window text-properties overlay sha1 md5 base64 format env code-pages
mule custom widget hashtable-print-readable backquote threads w32notify
w32 lcms2 multi-tty make-network-process emacs)

Memory information:
((conses 16 148954 7276)
 (symbols 48 13698 1)
 (strings 32 40410 1316)
 (string-bytes 1 1461011)
 (vectors 16 21458)
 (vector-slots 8 300360 13838)
 (floats 8 55 160)
 (intervals 56 2822 0)
 (buffers 984 18))
----------[ End Emacs debug info ]----------

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