bug#34847: 27.0.50; auto-revert-buffers occasionally selects a killed buffer

[Dale Sedivec]

Lately, while in the process of using Magit, I've frequently gotten
"Selecting deleting buffer" errors.  Here's a backtrace I got while
exiting magit-ediff:

~~~~~~
Debugger entered--Lisp error: (error "Selecting deleted buffer")
  set-buffer(#<killed buffer>)
  (save-current-buffer (set-buffer buf) (if (buffer-live-p buf) (progn
(if (and (not auto-revert-mode) (not auto-revert-tail-mode) (memq buf
auto-revert-buffer-list)) (auto-revert-remove-current-buffer)) (if
(auto-revert-active-p) (progn (if (and auto-revert-use-notify (not
auto-revert-notify-watch-descriptor)) (progn
(auto-revert-notify-add-watch))) (auto-revert-handler))))
(auto-revert-remove-current-buffer)))
  (let ((buf (car bufs))) (save-current-buffer (set-buffer buf) (if
(buffer-live-p buf) (progn (if (and (not auto-revert-mode) (not
auto-revert-tail-mode) (memq buf auto-revert-buffer-list))
(auto-revert-remove-current-buffer)) (if (auto-revert-active-p) (progn
(if (and auto-revert-use-notify ...) (progn ...))
(auto-revert-handler)))) (auto-revert-remove-current-buffer))))
  (while (and bufs (not (and auto-revert-stop-on-user-input
(input-pending-p)))) (let ((buf (car bufs))) (save-current-buffer
(set-buffer buf) (if (buffer-live-p buf) (progn (if (and (not
auto-revert-mode) (not auto-revert-tail-mode) (memq buf
auto-revert-buffer-list)) (auto-revert-remove-current-buffer)) (if
(auto-revert-active-p) (progn (if ... ...) (auto-revert-handler))))
(auto-revert-remove-current-buffer)))) (setq bufs (cdr bufs)))
  (let ((bufs (if global-auto-revert-mode (buffer-list)
auto-revert-buffer-list)) remaining new) (setq bufs (delq nil (mapcar
#'(lambda (buf) (save-current-buffer (set-buffer buf) (and ... buf)))
bufs))) (let ((--dolist-tail-- auto-revert-remaining-buffers)) (while
--dolist-tail-- (let ((buf (car --dolist-tail--))) (if (memq buf bufs)
(setq remaining (cons buf remaining))) (setq --dolist-tail-- (cdr
--dolist-tail--))))) (let ((--dolist-tail-- bufs)) (while
--dolist-tail-- (let ((buf (car --dolist-tail--))) (if (not (memq buf
remaining)) (setq new (cons buf new))) (setq --dolist-tail-- (cdr
--dolist-tail--))))) (setq bufs (nreverse (nconc new remaining)))
(while (and bufs (not (and auto-revert-stop-on-user-input
(input-pending-p)))) (let ((buf (car bufs))) (save-current-buffer
(set-buffer buf) (if (buffer-live-p buf) (progn (if (and ... ... ...)
(auto-revert-remove-current-buffer)) (if (auto-revert-active-p) (progn
... ...))) (auto-revert-remove-current-buffer)))) (setq bufs (cdr
bufs))) (setq auto-revert-remaining-buffers bufs) (if (and (not
global-auto-revert-mode) (null auto-revert-buffer-list)) (progn (if
(timerp auto-revert-timer) (cancel-timer auto-revert-timer)) (setq
auto-revert-timer nil))))
  (progn (let ((bufs (if global-auto-revert-mode (buffer-list)
auto-revert-buffer-list)) remaining new) (setq bufs (delq nil (mapcar
#'(lambda (buf) (save-current-buffer ... ...)) bufs))) (let
((--dolist-tail-- auto-revert-remaining-buffers)) (while
--dolist-tail-- (let ((buf (car --dolist-tail--))) (if (memq buf bufs)
(setq remaining (cons buf remaining))) (setq --dolist-tail-- (cdr
--dolist-tail--))))) (let ((--dolist-tail-- bufs)) (while
--dolist-tail-- (let ((buf (car --dolist-tail--))) (if (not (memq buf
remaining)) (setq new (cons buf new))) (setq --dolist-tail-- (cdr
--dolist-tail--))))) (setq bufs (nreverse (nconc new remaining)))
(while (and bufs (not (and auto-revert-stop-on-user-input
(input-pending-p)))) (let ((buf (car bufs))) (save-current-buffer
(set-buffer buf) (if (buffer-live-p buf) (progn (if ... ...) (if ...
...)) (auto-revert-remove-current-buffer)))) (setq bufs (cdr bufs)))
(setq auto-revert-remaining-buffers bufs) (if (and (not
global-auto-revert-mode) (null auto-revert-buffer-list)) (progn (if
(timerp auto-revert-timer) (cancel-timer auto-revert-timer)) (setq
auto-revert-timer nil)))))
  (unwind-protect (progn (let ((bufs (if global-auto-revert-mode
(buffer-list) auto-revert-buffer-list)) remaining new) (setq bufs
(delq nil (mapcar #'(lambda ... ...) bufs))) (let ((--dolist-tail--
auto-revert-remaining-buffers)) (while --dolist-tail-- (let ((buf
...)) (if (memq buf bufs) (setq remaining ...)) (setq --dolist-tail--
(cdr --dolist-tail--))))) (let ((--dolist-tail-- bufs)) (while
--dolist-tail-- (let ((buf ...)) (if (not ...) (setq new ...)) (setq
--dolist-tail-- (cdr --dolist-tail--))))) (setq bufs (nreverse (nconc
new remaining))) (while (and bufs (not (and
auto-revert-stop-on-user-input (input-pending-p)))) (let ((buf (car
bufs))) (save-current-buffer (set-buffer buf) (if (buffer-live-p buf)
(progn ... ...) (auto-revert-remove-current-buffer)))) (setq bufs (cdr
bufs))) (setq auto-revert-remaining-buffers bufs) (if (and (not
global-auto-revert-mode) (null auto-revert-buffer-list)) (progn (if
(timerp auto-revert-timer) (cancel-timer auto-revert-timer)) (setq
auto-revert-timer nil))))) (set-match-data save-match-data-internal
'evaporate))
  (let ((save-match-data-internal (match-data))) (unwind-protect
(progn (let ((bufs (if global-auto-revert-mode (buffer-list)
auto-revert-buffer-list)) remaining new) (setq bufs (delq nil (mapcar
#'... bufs))) (let ((--dolist-tail-- auto-revert-remaining-buffers))
(while --dolist-tail-- (let (...) (if ... ...) (setq --dolist-tail--
...)))) (let ((--dolist-tail-- bufs)) (while --dolist-tail-- (let
(...) (if ... ...) (setq --dolist-tail-- ...)))) (setq bufs (nreverse
(nconc new remaining))) (while (and bufs (not (and
auto-revert-stop-on-user-input ...))) (let ((buf ...))
(save-current-buffer (set-buffer buf) (if ... ... ...))) (setq bufs
(cdr bufs))) (setq auto-revert-remaining-buffers bufs) (if (and (not
global-auto-revert-mode) (null auto-revert-buffer-list)) (progn (if
(timerp auto-revert-timer) (cancel-timer auto-revert-timer)) (setq
auto-revert-timer nil))))) (set-match-data save-match-data-internal
'evaporate)))
  (closure (t) nil "Revert buffers as specified by Auto-Revert and
Glo..." (setq auto-revert-buffers-counter (1+
auto-revert-buffers-counter)) (let ((save-match-data-internal
(match-data))) (unwind-protect (progn (let ((bufs (if
global-auto-revert-mode ... auto-revert-buffer-list)) remaining new)
(setq bufs (delq nil (mapcar ... bufs))) (let ((--dolist-tail--
auto-revert-remaining-buffers)) (while --dolist-tail-- (let ... ...
...))) (let ((--dolist-tail-- bufs)) (while --dolist-tail-- (let ...
... ...))) (setq bufs (nreverse (nconc new remaining))) (while (and
bufs (not ...)) (let (...) (save-current-buffer ... ...)) (setq bufs
(cdr bufs))) (setq auto-revert-remaining-buffers bufs) (if (and (not
global-auto-revert-mode) (null auto-revert-buffer-list)) (progn (if
... ...) (setq auto-revert-timer nil))))) (set-match-data
save-match-data-internal 'evaporate))))()
  apply((closure (t) nil "Revert buffers as specified by Auto-Revert
and Glo..." (setq auto-revert-buffers-counter (1+
auto-revert-buffers-counter)) (let ((save-match-data-internal
(match-data))) (unwind-protect (progn (let ((bufs ...) remaining new)
(setq bufs (delq nil ...)) (let (...) (while --dolist-tail-- ...))
(let (...) (while --dolist-tail-- ...)) (setq bufs (nreverse ...))
(while (and bufs ...) (let ... ...) (setq bufs ...)) (setq
auto-revert-remaining-buffers bufs) (if (and ... ...) (progn ...
...)))) (set-match-data save-match-data-internal 'evaporate)))) nil)
  auto-revert-buffers()
  magit-auto-revert-buffers()
  magit-refresh()
  magit-update-index()
  (save-current-buffer (set-buffer ediff-buffer-B) (magit-update-index))
  (with-current-buffer ediff-buffer-B (magit-update-index))
  (and (buffer-live-p ediff-buffer-B) (buffer-modified-p
ediff-buffer-B) (with-current-buffer ediff-buffer-B
(magit-update-index)))
  (lambda nil (and (buffer-live-p ediff-buffer-B) (buffer-modified-p
ediff-buffer-B) (with-current-buffer ediff-buffer-B
(magit-update-index))) (and (buffer-live-p ediff-buffer-C)
(buffer-modified-p ediff-buffer-C) (with-current-buffer ediff-buffer-C
(when (y-or-n-p (format "Save file %s? " buffer-file-name))
(save-buffer)))) (ediff-kill-buffer-carefully ediff-buffer-A)
(ediff-kill-buffer-carefully ediff-buffer-B) (let
((magit-ediff-previous-winconf #<window-configuration>)) (run-hooks
'magit-ediff-quit-hook)))()
  run-hooks(ediff-quit-hook)
  ediff-really-quit(nil)
  ediff-quit(nil)
  funcall-interactively(ediff-quit nil)
  call-interactively(ediff-quit nil nil)
  command-execute(ediff-quit)
~~~~~~

I have global-auto-revert-mode on.  I *suspect* this happens because
*something* kills a buffer between when auto-revert-buffers collects
the list of buffers with (buffer-list) and when auto-revert-buffers
starts its final traversal of buffers in bufs (which starts out as
(buffer-list) in global-auto-revert-mode).

Around line 795 inside auto-revert-buffers, the code is:

          (with-current-buffer buf
            (if (buffer-live-p buf)
                ...
              ;; Remove dead buffer from `auto-revert-buffer-list'.
              (auto-revert-remove-current-buffer)))

It seems like reversing this so that with-current-buffer is only
called after buffer-live-p is checked might be a good solution to
avoid trying to select a deleted buffer?

Reproducing this is random for me but many times a day recently.
Alternatively, here is a contrived recipe to reproduce this error, but
*not* using global-auto-revert-mode, instead purposely putting a dead
buffer in auto-revert-buffer-list.  I think it still hits the same
code path inside auto-revert-buffers.

~~~~~~
(require 'autorevert)
(let ((buf (generate-new-buffer "foo")))
  (push buf auto-revert-buffer-list)
  (kill-buffer buf)
  (auto-revert-buffers))
~~~~~~

Regards,
Dale


In GNU Emacs 27.0.50 (build 1, x86_64-apple-darwin17.7.0, NS
appkit-1561.60 Version 10.13.6 (Build 17G5019))
 of 2019-03-12 built on dale
Repository revision: e2b261b66c8352fb07631a89de6c361fdb9e31b8
Repository branch: master
Windowing system distributor 'Apple', version 10.3.1561
System Description:  Mac OS X 10.13.6

Recent messages:
[2019-03-13 12:43:09.484731]  [2 times]
[2019-03-13 12:43:12.296602] Mark set [2 times]
[2019-03-13 12:43:13.170098] Saved text until " nil nil)
  command-execute(ediff-quit)
"
[2019-03-13 12:43:17.822853] Continuing.
imenu-unavailable-error: Selecting deleted buffer
[2019-03-13 12:43:19.929933] Quit this Ediff session? (y or n) y
[2019-03-13 12:43:30.317398]  [2 times]
[2019-03-13 12:43:30.318205] ‘report-emacs-bug-info’ is an obsolete
command (as of 24.3); use ‘info-emacs-bug’ instead.

Configured using:
 'configure --with-ns --with-modules --with-rsvg --with-imagemagick
 --with-xml2 --with-gnutls --with-json --without-x'

Configured features:
RSVG IMAGEMAGICK GLIB NOTIFY KQUEUE ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS XIM NS MODULES THREADS JSON PDUMPER LCMS2

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

Major mode: Magit

Minor modes in effect:
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/Users/dale/.emacs.d/elpa/org-plus-contrib-20190306/org-protocol hides
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/Users/dale/.emacs.d/elpa/org-plus-contrib-20190306/org-feed hides
/Users/dale/Applications/Emacs.app/Contents/Resources/lisp/org/org-feed
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/Users/dale/.emacs.d/elpa/org-plus-contrib-20190306/ob-picolisp hides
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/Users/dale/.emacs.d/elpa/org-plus-contrib-20190306/org-indent hides
/Users/dale/Applications/Emacs.app/Contents/Resources/lisp/org/org-indent
/Users/dale/.emacs.d/elpa/org-plus-contrib-20190306/ob-lilypond hides
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Features:
(shadow sort mail-extr emacsbug sendmail two-column iso-transl dired-aux
counsel-advice-remove ace-window disp-table conf-mode comment-dwim-2
warnings macrostep ivy-xref counsel-auto-grep disass vc-annotate
pkg-info epl pyvenv esh-var esh-cmd esh-opt esh-io esh-ext esh-proc
esh-arg esh-groups eshell esh-module esh-mode esh-util mc-mark-more
multiple-cursors-core rect hl-line+ hl-line hideshow company-anaconda
face-remap markdown-mode edit-indirect deft pulse misearch multi-isearch
debug backtrace link-hint browse-url avy bs magit-imenu git-rebase
magit-ediff ediff-merg ediff-wind ediff-diff ediff-mult ediff-help
ediff-init ediff-util ediff unfill bug-reference adaptive-wrap
magit-extras magit-bookmark magit-submodule magit-obsolete magit-blame
magit-stash magit-bisect magit-push magit-pull magit-fetch magit-clone
magit-remote magit-commit magit-sequence magit-notes magit-worktree
magit-tag magit-merge magit-branch magit-reset magit-files magit-refs
magit-status magit magit-repos magit-apply magit-wip magit-log
magit-diff smerge-mode magit-core magit-autorevert magit-margin
magit-transient magit-process magit-mode transient git-commit magit-git
magit-section magit-utils crm log-edit pcvs-util with-editor
async-bytecomp async eieio-opt speedbar sb-image ezimage dframe
cl-indent mwim cl-print ielm amx url-cache url-http url-gw url-auth
add-log frameset org-duration org-table org-eldoc org-indent eltu
anaconda-mode url url-proxy url-privacy url-expand url-methods
url-history url-cookie url-domsuf url-util mailcap pythonic
network-stream nsm importmagic f s epc ctable concurrent deferred
python-el-fgallina-expansions python tramp-sh tramp tramp-loaddefs
trampver tramp-integration tramp-compat which-func persistent-soft
list-utils pcache eieio-base font-utils haskell-snippets
yasnippet-snippets yasnippet winum winner window-purpose-x imenu-list
ivy-switch-with-purpose window-purpose window-purpose-fixes
window-purpose-prefix-overload window-purpose-switch let-alist
window-purpose-layout window-purpose-core window-purpose-configuration
eieio-compat window-purpose-utils windmove volatile-highlights
all-the-icons all-the-icons-faces data-material data-weathericons
data-octicons data-fileicons data-faicons data-alltheicons memoize
unicode-fonts undo-tree diff paredit aggressive-indent rainbow-mode
whitespace wspc-hydra auto-highlight-symbol company-keywords
company-etags etags fileloop company-gtags company-template
company-dabbrev-code company-dabbrev company-files company-capf
company-statistics company-tng company flyspell ispell goto-addr
highlight-parentheses paren sticky-region server saveplace reformatter
recentf tree-widget counsel-projectile projectile grep ibuf-ext ibuffer
ibuffer-loaddefs persp-mode org-clock ob-shell shell ob-sql ob-python
org-eww org-rmail org-mhe org-irc org-info org-gnus nnir gnus-sum
gnus-group gnus-undo gnus-start gnus-cloud nnimap nnmail mail-source
utf7 netrc nnoo parse-time gnus-spec gnus-int gnus-range message rmc
puny rfc822 mml mml-sec epa epg mailabbrev gmm-utils mailheader gnus-win
gnus nnheader gnus-util rmail rmail-loaddefs mail-utils org-docview
doc-view image-mode org-bibtex bibtex org-bbdb org-w3m org-id org-tempo
tempo cus-edit cus-start cus-load wid-edit org-element avl-tree
generator the-org-mode-expansions org-inset-dblock org ob ob-tangle
ob-ref ob-lob ob-table ob-exp org-macro org-footnote org-src ob-comint
org-pcomplete pcomplete org-list org-faces org-entities time-date
noutline outline org-version ob-emacs-lisp ob-core ob-eval org-keys
org-compat org-macs org-loaddefs format-spec cal-menu calendar
cal-loaddefs move-text minions smart-tabs lisp-comment-dwim hydra lv
hl-todo hi-lock flycheck-pos-tip pos-tip flycheck-package package-lint
imenu finder flycheck frame-resize expand-region text-mode-expansions
er-basic-expansions expand-region-core expand-region-custom edit-server
dtrt-indent diff-hl vc-dir ewoc vc vc-dispatcher counsel xdg xref
project compile comint ansi-color ring swiper ivy flx delsel colir color
ivy-overlay ffap thingatpt clean-aindent-mode carousel bookmark+
bookmark+-key derived dired-x dired dired-loaddefs bookmark+-1
bookmark+-bmu bookmark+-lit bookmark pp autorevert filenotify vc-git
diff-mode elec-pair find-func el-patch exec-path-from-shell which-key
advice paranoid-locals files-x cl-extra bind-key easy-mmode pcase dash
treepy quelpa mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047
rfc2045 mm-util ietf-drums mail-prsvr lisp-mnt help-fns radix-tree
help-mode jka-compr auto-compile packed finder-inf dsedivec-theme
autoloads tex-site edmacro kmacro rx sly-autoloads cl info package
easymenu epg-config url-handlers url-parse auth-source cl-seq eieio
eieio-core cl-macs eieio-loaddefs password-cache json subr-x map
url-vars seq byte-opt gv bytecomp byte-compile cconv cl-loaddefs cl-lib
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 1534501 263419)
 (symbols 48 54953 55)
 (strings 32 286959 26451)
 (string-bytes 1 8874219)
 (vectors 16 181513)
 (vector-slots 8 4860347 194852)
 (floats 8 1033 1217)
 (intervals 56 125404 6360)
 (buffers 992 151))