GNU bug report logs - #23168
24.5; 24.5; rcirc: incorrect buffer handling on buffer kills

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: xristos <xristos <at> sdf.lonestar.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.5; 24.5; rcirc: incorrect buffer handling on buffer kills
Date: Wed, 30 Mar 2016 22:41:55 -0400

emacs -Q
M-x rcirc
M-x kill-buffer RET y
M-: rcirc-activity (notice how #<killed buffer> is there)

2 ways to trigger bug from this point:

M-x rcirc 
M-x kill-buffer RET y => error in process sentinel: Selecting deleted buffer

OR

M-x rcirc
M-x ibuffer (or switch buffer to anything else and wait)

switching back to rcirc buffer after the IDENT phase has completed
will show "selecting deleted buffer" inline.

It seems that the bug is triggered inside rcirc-record-activity
which runs *after* kill-buffer has been called and *after*
rcirc-kill-buffer-hook has finished executing and removing
the buffer from rcirc-activity. At that point rcirc-record-activity
re-inserts the buffer-about-to-be-killed in rcirc-activity.

A possible fix for this issue that works in my case, is updating
rcirc-kill-buffer-hook to delete the associated process
after cleaning up the killed buffer:

  (when (eq major-mode 'rcirc-mode)
    (when (and rcirc-log-flag
               rcirc-log-directory)
      (rcirc-log-write))
    (rcirc-clean-up-buffer "Killed buffer")
+    (rcirc-delete-process nil)


In GNU Emacs 24.5.1 (x86_64-apple-darwin13.4.0, NS apple-appkit-1265.21)
 of 2015-08-27 on tennine-slave.macports.org
Windowing system distributor `Apple', version 10.3.1265
Configured using:
 `configure --prefix=/opt/local --with-ns --without-x --without-dbus
 CC=/usr/bin/clang 'CFLAGS=-pipe -Os -arch x86_64' 'LDFLAGS=-L/opt/local/lib
 -Wl,-headerpad_max_install_names -arch x86_64'
 CPPFLAGS=-I/opt/local/include'

Important settings:
  locale-coding-system: utf-8-unix

Major mode: Group

Minor modes in effect:
  gnus-topic-mode: t
  gnus-undo-mode: t
  hl-line-mode: t
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-networks-mode: t
  erc-pcomplete-mode: t
  erc-track-mode: t
  erc-match-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-netsplit-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  diff-auto-refine-mode: t
  global-git-commit-mode: t
  shell-dirtrack-mode: t
  show-paren-mode: t
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  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
Opening connection to wm.sdf.org via tls...
Opening connection to wm.sdf.org...done
Opening nnimap server on sdf...done
Opening nntp server on news.gmane.org...done
24 new newsgroups have arrived
Checking new news...
Reading active file via nndraft...done
Checking new news...done
*beep*
completing-read-default: Command attempted to use minibuffer while in minibuffer

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~/code/elisp/third-party/gnus/lisp/rfc1843 hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/rfc1843
~/code/elisp/third-party/gnus/lisp/registry hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/registry
~/code/elisp/third-party/gnus/lisp/qp hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/qp
~/code/elisp/third-party/gnus/lisp/pop3 hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/pop3
~/code/elisp/third-party/gnus/lisp/plstore hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/plstore
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~/code/elisp/third-party/gnus/lisp/nntp hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/nntp
~/code/elisp/third-party/gnus/lisp/nnspool hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/nnspool
~/code/elisp/third-party/gnus/lisp/nnrss hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/nnrss
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~/code/elisp/third-party/gnus/lisp/nnoo hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/nnoo
~/code/elisp/third-party/gnus/lisp/nnnil hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/nnnil
~/code/elisp/third-party/gnus/lisp/nnml hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/nnml
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~/code/elisp/third-party/gnus/lisp/nnmbox hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/nnmbox
~/code/elisp/third-party/gnus/lisp/nnmairix hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/nnmairix
~/code/elisp/third-party/gnus/lisp/nnmaildir hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/nnmaildir
~/code/elisp/third-party/gnus/lisp/nnmail hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/nnmail
~/code/elisp/third-party/gnus/lisp/nnir hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/nnir
~/code/elisp/third-party/gnus/lisp/nnimap hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/nnimap
~/code/elisp/third-party/gnus/lisp/nnheader hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/nnheader
~/code/elisp/third-party/gnus/lisp/nngateway hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/nngateway
~/code/elisp/third-party/gnus/lisp/nnfolder hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/nnfolder
~/code/elisp/third-party/gnus/lisp/nneething hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/nneething
~/code/elisp/third-party/gnus/lisp/nndraft hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/nndraft
~/code/elisp/third-party/gnus/lisp/nndoc hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/nndoc
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~/code/elisp/third-party/gnus/lisp/mml1991 hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/mml1991
~/code/elisp/third-party/gnus/lisp/mml hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/mml
~/code/elisp/third-party/gnus/lisp/mml-smime hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/mml-smime
~/code/elisp/third-party/gnus/lisp/mml-sec hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/mml-sec
~/code/elisp/third-party/gnus/lisp/mm-view hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/mm-view
~/code/elisp/third-party/gnus/lisp/mm-uu hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/mm-uu
~/code/elisp/third-party/gnus/lisp/mm-util hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/mm-util
~/code/elisp/third-party/gnus/lisp/mm-url hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/mm-url
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~/code/elisp/third-party/gnus/lisp/mm-archive hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/mm-archive
~/code/elisp/third-party/gnus/lisp/messcompat hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/messcompat
~/code/elisp/third-party/gnus/lisp/message hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/message
~/code/elisp/third-party/gnus/lisp/mailcap hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/mailcap
~/code/elisp/third-party/gnus/lisp/mail-source hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/mail-source
~/code/elisp/third-party/gnus/lisp/mail-prsvr hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/mail-prsvr
~/code/elisp/third-party/gnus/lisp/mail-parse hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/mail-parse
~/code/elisp/third-party/gnus/lisp/legacy-gnus-agent hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/legacy-gnus-agent
~/code/elisp/third-party/gnus/lisp/ietf-drums hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/ietf-drums
~/code/elisp/third-party/gnus/lisp/html2text hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/html2text
~/code/elisp/third-party/gnus/lisp/gssapi hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gssapi
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~/code/elisp/third-party/gnus/lisp/gnus hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus
~/code/elisp/third-party/gnus/lisp/gnus-win hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-win
~/code/elisp/third-party/gnus/lisp/gnus-vm hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-vm
~/code/elisp/third-party/gnus/lisp/gnus-uu hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-uu
~/code/elisp/third-party/gnus/lisp/gnus-util hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-util
~/code/elisp/third-party/gnus/lisp/gnus-undo hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-undo
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~/code/elisp/third-party/gnus/lisp/gnus-start hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-start
~/code/elisp/third-party/gnus/lisp/gnus-srvr hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-srvr
~/code/elisp/third-party/gnus/lisp/gnus-spec hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-spec
~/code/elisp/third-party/gnus/lisp/gnus-sieve hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-sieve
~/code/elisp/third-party/gnus/lisp/gnus-score hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-score
~/code/elisp/third-party/gnus/lisp/gnus-salt hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-salt
~/code/elisp/third-party/gnus/lisp/gnus-registry hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-registry
~/code/elisp/third-party/gnus/lisp/gnus-range hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-range
~/code/elisp/third-party/gnus/lisp/gnus-picon hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-picon
~/code/elisp/third-party/gnus/lisp/gnus-notifications hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-notifications
~/code/elisp/third-party/gnus/lisp/gnus-msg hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-msg
~/code/elisp/third-party/gnus/lisp/gnus-mlspl hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-mlspl
~/code/elisp/third-party/gnus/lisp/gnus-ml hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-ml
~/code/elisp/third-party/gnus/lisp/gnus-mh hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-mh
~/code/elisp/third-party/gnus/lisp/gnus-logic hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-logic
~/code/elisp/third-party/gnus/lisp/gnus-kill hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-kill
~/code/elisp/third-party/gnus/lisp/gnus-int hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-int
~/code/elisp/third-party/gnus/lisp/gnus-icalendar hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-icalendar
~/code/elisp/third-party/gnus/lisp/gnus-html hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-html
~/code/elisp/third-party/gnus/lisp/gnus-group hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-group
~/code/elisp/third-party/gnus/lisp/gnus-gravatar hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-gravatar
~/code/elisp/third-party/gnus/lisp/gnus-fun hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-fun
~/code/elisp/third-party/gnus/lisp/gnus-ems hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-ems
~/code/elisp/third-party/gnus/lisp/gnus-eform hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-eform
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~/code/elisp/third-party/gnus/lisp/gnus-draft hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-draft
~/code/elisp/third-party/gnus/lisp/gnus-dired hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-dired
~/code/elisp/third-party/gnus/lisp/gnus-diary hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-diary
~/code/elisp/third-party/gnus/lisp/gnus-demon hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-demon
~/code/elisp/third-party/gnus/lisp/gnus-delay hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-delay
~/code/elisp/third-party/gnus/lisp/gnus-cus hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-cus
~/code/elisp/third-party/gnus/lisp/gnus-cite hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-cite
~/code/elisp/third-party/gnus/lisp/gnus-cache hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-cache
~/code/elisp/third-party/gnus/lisp/gnus-bookmark hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-bookmark
~/code/elisp/third-party/gnus/lisp/gnus-bcklg hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-bcklg
~/code/elisp/third-party/gnus/lisp/gnus-async hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-async
~/code/elisp/third-party/gnus/lisp/gnus-art hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-art
~/code/elisp/third-party/gnus/lisp/gnus-agent hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gnus-agent
~/code/elisp/third-party/gnus/lisp/gmm-utils hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/gmm-utils
~/code/elisp/third-party/gnus/lisp/flow-fill hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/flow-fill
~/code/elisp/third-party/gnus/lisp/ecomplete hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/ecomplete
~/code/elisp/third-party/gnus/lisp/deuglify hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/deuglify
~/code/elisp/third-party/gnus/lisp/compface hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/compface
~/code/elisp/third-party/gnus/lisp/canlock hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/canlock
~/code/elisp/third-party/gnus/lisp/auth-source hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/gnus/auth-source
~/code/elisp/third-party/gnus/lisp/time-date hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/calendar/time-date
~/code/elisp/third-party/gnus/lisp/parse-time hides /Applications/MacPorts/Emacs.app/Contents/Resources/lisp/calendar/parse-time

Features:
(shadow sort mail-extr tmm emacsbug gnus-topic nndraft nnmh gnus-agent
gnus-srvr gnus-score score-mode nnvirtual gnus-msg gnus-art mm-uu mml2015
mm-view mml-smime smime dig utf-7 gnutls nnml nnfolder gnus-cache rot13
gnus-demon nntp gnushush timezone smtpmail sendmail nnir gnus-sum gnus-group
gnus-undo nnrss mm-url gnus-start gnus-cloud nnimap nnmail mail-source utf7
netrc nnoo parse-time gnus-spec gnus-int gnus-range gnus-win gnus gnus-ems
gnus-compat nnheader rcirc ibuf-ext hl-line animate xristos-autostart
company-oddmuse company-keywords company-etags company-gtags
company-dabbrev-code company-dabbrev company-files company-capf
company-cmake company-xcode company-clang company-semantic company-eclim
company-template company-css company-nxml company-bbdb ielm xristos-keys
cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine
cc-vars cc-defs xristos-gnus gnus-load xristos-mud rinzai-script
rinzai-script-edit rinzai-worlds rinzai rinzai-prompt rinzai-telnet
xristos-erc erc-crypt erc-autoaway erc-notify erc-log erc-dcc erc-lang
erc-list erc-menu erc-join erc-ring erc-networks erc-pcomplete erc-track
erc-match erc-button erc-fill erc-stamp erc-netsplit erc-goodies erc
erc-backend erc-compat xristos-socks socks network-stream starttls
xristos-hooks em-term term disp-table ehelp xterm-color git-timemachine
vc-git magit-blame magit-stash magit-bisect magit-remote magit-commit
magit-sequence magit magit-apply magit-wip magit-log magit-diff smerge-mode
diff-mode magit-core magit-process magit-popup magit-mode magit-git crm
magit-section magit-utils git-commit log-edit message idna rfc822 mml
mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mailabbrev mail-utils gmm-utils mailheader pcvs-util add-log
with-editor tramp-sh tramp tramp-compat tramp-loaddefs trampver shell server
geiser-load geiser dash twittering-mode tls url url-proxy url-privacy
url-expand url-methods url-history url-cookie url-domsuf url-util url-parse
auth-source eieio eieio-core gnus-util mm-util mail-prsvr password-cache
url-vars mailcap xml htmlize epa-file epa epg epg-config ibuffer yasnippet
help-mode org-capture org-element avl-tree org org-macro org-footnote
org-pcomplete org-list org-faces org-entities org-version ob-emacs-lisp ob
ob-tangle ob-ref ob-lob ob-table ob-exp org-src ob-keys ob-comint ob-core
ob-eval org-compat org-macs org-loaddefs format-spec cal-menu calendar
cal-loaddefs distel-ie edb ewoc erl-service derl epmd net-fsm erl mcase
erlext distel erlang tempo erlang-flymake flymake erlang-start
slime-xref-browser tree-widget wid-edit slime-indentation slime-cl-indent
cl-indent slime-fancy slime-trace-dialog slime-fontifying-fu
slime-package-fu slime-references slime-compiler-notes-tree slime-scratch
slime-presentations slime-macrostep macrostep slime-mdot-fu
slime-enclosing-context slime-fuzzy slime-fancy-trace slime-fancy-inspector
slime-c-p-c slime-editing-commands slime-autodoc slime-banner slime-asdf
slime-repl elp slime-parse grep slime-sprof inferior-slime bridge slime
derived gud apropos compile arc-mode archive-mode noutline outline pp
hyperspec flyspell ispell thingatpt browse-url paren company pcase dired-x
edmacro kmacro dired xristos-ui pcomplete comint ansi-color esh-var esh-io
esh-cmd esh-opt esh-ext esh-proc esh-arg eldoc esh-groups eshell esh-module
esh-mode esh-util smooth-scrolling saveplace smex ido-vertical-mode idomenu
imenu flx-ido easy-mmode warnings byte-opt flx ido noctilux-theme
noctilux-definitions time delsel bytecomp byte-compile cl-extra cconv
xristos-package package xristos-tls xristos-custom xristos-functions
find-func etags ring xristos-info advice help-fns cl-macs info easymenu cl
gv cl-loaddefs cl-lib time-date tooltip electric uniquify ediff-hook
vc-hooks lisp-float-type mwheel ns-win tool-bar dnd fontset image regexp-opt
fringe tabulated-list newcomment lisp-mode prog-mode register page menu-bar
rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax facemenu
font-core frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai
tai-viet lao korean japanese hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help
simple abbrev minibuffer 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 make-network-process cocoa
ns multi-tty emacs)

Memory information:
((conses 16 785917 228128)
 (symbols 48 97579 0)
 (miscs 40 358 831)
 (strings 32 182056 98370)
 (string-bytes 1 5798306)
 (vectors 16 79850)
 (vector-slots 8 2091656 24277)
 (floats 8 11325 297)
 (intervals 56 1386 418)
 (buffers 960 38))

Message #8 received at 23168 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: xristos <xristos <at> sdf.lonestar.org>
Cc: 23168 <at> debbugs.gnu.org
Subject: Re: bug#23168: 24.5; 24.5; rcirc: incorrect buffer handling on
 buffer kills
Date: Mon, 29 Jul 2019 00:43:06 +0200

xristos <xristos <at> sdf.lonestar.org> writes:

> emacs -Q
> M-x rcirc
> M-x kill-buffer RET y
> M-: rcirc-activity (notice how #<killed buffer> is there)
>
> 2 ways to trigger bug from this point:
>
> M-x rcirc 
> M-x kill-buffer RET y => error in process sentinel: Selecting deleted buffer
>
> OR
>
> M-x rcirc
> M-x ibuffer (or switch buffer to anything else and wait)
>
> switching back to rcirc buffer after the IDENT phase has completed
> will show "selecting deleted buffer" inline.

[...]

>   (when (eq major-mode 'rcirc-mode)
>     (when (and rcirc-log-flag
>                rcirc-log-directory)
>       (rcirc-log-write))
>     (rcirc-clean-up-buffer "Killed buffer")
> +    (rcirc-delete-process nil)

(I'm going through old Emacs bug reports that haven't received any
response.)

I don't use rcirc myself, but something along those lines (with a bit
more error checking) seems to be an the right thing to do, so I've now
done this for Emacs 27.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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