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bug#39137: 26.3; ispell-really-hunspell sometimes fails in init

From: Bob Rogers
Subject: bug#39137: 26.3; ispell-really-hunspell sometimes fails in init
Date: Tue, 14 Jan 2020 16:25:07 -0500

   Spell checking can die with "(wrong-type-argument stringp nil)" when
ispell-really-hunspell is true.  To reproduce (if it reproduces at all
on your system), just do "emacs -Q" with Hunspell installed and M-$ on
any of the words in the startup screen.

   On some of the systems I use, it fails reliably when initializing; on
others, it works reliably.  All systems are running the openSUSE Leap
15.1 release of GNU/Linux, fully updated, with the identical locally-
built RPM version of Emacs 26.3 (with no local patches) and the distro
Hunspell 1.6.2.  The key seems to be whether ispell-dictionary-alist is
initialized before ispell-start-process is called; just a warning to
anyone who fails to reproduce this.  But since it fails in "emacs -Q" on
systems with apparently identical software, I am at a complete loss to
figure this out.

When it fails, the backtrace looks like this:

        Debugger entered--Lisp error: (wrong-type-argument stringp nil)
          string-match("," nil 0)
          split-string(nil "," t)
          ispell-word(nil nil nil t)
          funcall-interactively(ispell-word nil nil nil t)
          call-interactively(ispell-word nil nil)

The problem seems to be related to this code in the start of

  ;; Parse hunspell affix file if using hunspell and entry is uninitialized.
  (if ispell-really-hunspell
      (or (cadr (assoc ispell-current-dictionary ispell-dictionary-alist))
          (ispell-hunspell-fill-dictionary-entry ispell-current-dictionary)))

It appears that "nil" is valid for ispell-current-dictionary and means
"default", but ispell-hunspell-fill-dictionary-entry expects only a
string.  On that basis, I would claim that there is a bug that has
perhaps been hidden by being on a rare execution path.  But if
ispell-dictionary-alist is already initialized with a "nil" entry, then
ispell-hunspell-fill-dictionary-entry never gets called, leading to the
"reproducible irreproducibility" of this bug.  And if
ispell-dictionary-alist should *always* be initialized and contain the
current entry, then this is dead code.

   I don't know where or how ispell-current-dictionary is getting set up
on some systems but not on others, nor how it ought to be set up, so I
am unable to take this any further.

                                        -- Bob Rogers
                                           Modular Genetics Inc.

In GNU Emacs 26.3 (build 1, x86_64-suse-linux-gnu, GTK+ Version 3.22.30)
 of 2019-11-21 built on yuggoth
Windowing system distributor 'The X.Org Foundation', version 11.0.12003000
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Entering debugger...

Configured using:
 'configure --with-pop --without-dbus --without-gsettings
 --without-gconf --prefix=/usr --infodir=/usr/share/info
 --mandir=/usr/share/man --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --with-x --with-xpm=no --with-jpeg --with-tiff --with-gif=no --with-png
 --with-x-toolkit=gtk3 --x-includes=/usr/X11R6/include
 --x-libraries=/usr/X11R6/lib64 --build x86_64-suse-linux 'CFLAGS=-g -O2
 -fno-optimize-sibling-calls' LDFLAGS=-s'

Configured features:

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Debugger

Minor modes in effect:
  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
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

(shadow sort mail-extr emacsbug message rmc puny seq dired
dired-loaddefs format-spec rfc822 mml mml-sec password-cache epa derived
epg epg-config gnus-util rmail rmail-loaddefs mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils help-mode
easymenu cl-print byte-opt gv bytecomp byte-compile cl-loaddefs cl-lib
cconv debug ispell elec-pair time-date mule-util tooltip eldoc electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win
term/common-win x-dnd 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 inotify dynamic-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 100243 8442)
 (symbols 48 20704 1)
 (miscs 40 88 143)
 (strings 32 30091 1374)
 (string-bytes 1 795489)
 (vectors 16 15184)
 (vector-slots 8 514416 10616)
 (floats 8 55 85)
 (intervals 56 284 0)
 (buffers 992 12))

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