Hello,
To start off, this issue is not specific to emacs 27. I have been noticing this issue for maybe one or two weeks and just to formally reporting it.
Issue: When doing desktop-read, only files from a certain project root cause these errors:
File mode specification error: (wrong-type-argument stringp nil) [2 times]
Digging deeper, it looks like the set-auto-mode call in normal-mode is returning nil. But it is surprising because the files for which this error shows up does actually have an associated major mode (verilog-mode).
After the desktop loads, I am able to see the files that flagged that error properly in the correct major mode though.
Here is the error backtrace:
(*I have replaced the actual path with /my/prj/root/some.file for the purpose of corporate privacy. The some.file is has verilog-mode as its major mode.)
Debugger entered--Lisp error: "File mode specification error: (wrong-type-argument stringp nil)"
#<subr message>("File mode specification error: %s" (wrong-type-argument stringp nil))
apply(#<subr message> ("File mode specification error: %s" (wrong-type-argument stringp nil)))
message("File mode specification error: %s" (wrong-type-argument stringp nil))
normal-mode(t)
after-find-file(nil nil)
find-file-noselect-1(#<buffer some.file> "/my/prj/root/some.file" :nowarn nil "/my/prj/root/some.file" (96434279 175))
find-file-noselect("/my/prj/root/some.file" :nowarn)
desktop-restore-file-buffer("/my/prj/root/some.file" "some.file" nil)
desktop-create-buffer(208 "/my/prj/root/some.file" "some.file" verilog-mode (abbrev-mode override-global-mode modi-mode beacon-mode hi-lock-mode volatile-highlights-mode hungry-delete-mode rainbow-delimiters-mode undo-tree-mode projectile-mode hardcore-mode ivy-mode which-key-mode flyspell-mode yas-minor-mode auto-complete-mode mode-line-space-mode) 6362 (19911 nil) t nil ((buffer-display-time 22952 2660 236587 832000) (buffer-file-coding-system . undecided-unix)) ((mark-ring (19911))))
eval-buffer(#<buffer *load*-734956> nil "/home/kmodi/.emacs.d/emacs_27_0.desktop" nil t) ; Reading at buffer position 67828
In GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 2.24.23)
of 2017-09-16
Repository revision: 977cd6cb28a37744966ec62f70cf62659f6f302a
Windowing system distributor 'The X.Org Foundation', version 11.0.60900000
System Description: Red Hat Enterprise Linux Workstation release 6.6 (Santiago)
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Configured using:
'configure --with-modules
--prefix=/home/kmodi/usr_local/apps/6/emacs/master
'--program-transform-name=s/^ctags$/ctags_emacs/'
'CPPFLAGS=-I/home/kmodi/usr_local/6/include -I/usr/include/freetype2
-I/usr/include' 'CFLAGS=-ggdb3 -O0' 'CXXFLAGS=-ggdb3 -O0'
'LDFLAGS=-L/home/kmodi/usr_local/6/lib -L/home/kmodi/usr_local/6/lib64
-ggdb3'
PKG_CONFIG_PATH=/home/kmodi/usr_local/6/lib/pkgconfig:/home/kmodi/usr_local/6/lib64/pkgconfig:/cad/adi/apps/gnu/linux/x86_64/6/lib/pkgconfig:/cad/adi/apps/gnu/linux/x86_64/6/lib64/pkgconfig:/usr/lib/pkgconfig:/usr/lib64/pkgconfig:/usr/share/pkgconfig:/lib/pkgconfig:/lib64/pkgconfig'
Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK2 X11 MODULES
Important settings:
value of $LANG: en_US.UTF-8
value of $XMODIFIERS: @im=none
locale-coding-system: utf-8-unix
Major mode: Lisp Interaction
Minor modes in effect:
tooltip-mode: t
global-eldoc-mode: t
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 subr-x puny seq byte-opt gv
bytecomp byte-compile cconv cl-loaddefs cl-lib dired dired-loaddefs
format-spec rfc822 mml easymenu 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 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 dbusbind inotify
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)
Memory information:
((conses 16 97100 8003)
(symbols 48 20813 1)
(miscs 40 46 119)
(strings 32 28798 1799)
(string-bytes 1 765072)
(vectors 16 14942)
(vector-slots 8 508712 6478)
(floats 8 48 68)
(intervals 56 245 0)
(buffers 992 11)
(heap 1024 29158 859))